AT&T Telephone DS1/DMi/ISDN-PRI Manual do Utilizador Página 1

AT&TAT&T 555-025-101Issue 4April 1990DEFINITY®CommunicationsSystemand System 75 and System 85DS1/DMI/ISDN-PRI Reference

xCONTENTSSystem 85 DS1/DMI-BOS to a CEM or CDMC. ADMINISTRATIVE PROCEDURE SUMMARYPROCEDURE 000 WORD 3 (Generic 2 Only)PROCEDURE 000 WORD 4 (System 85

5-10SYNCHRONIZATION OF DIGITAL FACILITIES●●●●●●●●●Loss of signal (LOS) at the (SCS) circuit for more than 200 ms. A switch is made to the high-accura

SYNCHRONIZATION OF DIGITAL FACILITIES5-11monitored to make sure that a switch is not attempted to an unhealthy SCS. If the SCS is notduplicated and th

5-12SYNCHRONIZATION OF DIGITAL FACILITIESTN768 or TN780 CIRCUIT PACKSTRATUM 4ACCURACYCLOCKTONEGENERATORMISCELLANEOUSTONESEXTERNALSYNCSOURCEPRIMARYREFE

SYNCHRONIZATION OF DIGITAL FACILITIES5-13●●●●●Yellow LED is on 2.7 seconds and off 0.3 seconds — the tone-clock synchronizer is in “active”mode and a

5-14SYNCHRONIZATION OF DIGITAL FACILITIESWith automatic reference switching enabled, most Generic 1 error counters are decremented by 1every 15 minute

SYNCHRONIZATION OF DIGITAL FACILITIES5-15references must be from a stratum 3 or stratum 2 source. The same basic considerations that apply tothe selec

5-16SYNCHRONIZATION OF DIGITAL FACILITIESFigure 5-8. External ClockPrivate network applications that do not have digital connections to the public ne

SYNCHRONIZATION OF DIGITAL FACILITIES5-17TN2131 CIRCUIT PACKCOMPOSITECLOCKOUTPUT #1COMPOSITECLOCKCONVERTERSYNCCABLESALARMSNOTE 1LOSDETECTIONCOMPOSITEC

5-18SYNCHRONIZATION OF DIGITAL FACILITIESNETWORK SYNCHRONIZATION AND ENGINEERINGThe primary goals of network synchronization are:●●To keep each digita

SYNCHRONIZATION OF DIGITAL FACILITIES5-19DIGITAL SERVING OFFICEEXTERNALLYREFERENCEDNODESSYSTEM85 OR 75INTERNALLYREFERENCEDNODESSYSTEM85 OR 75DIGITAL T

CONTENTSxiD. TRUNK TYPE AND SIGNALING TYPE COMPATIBILITYTABLESABBREVIATIONSAB-1GLOSSARYINDEXD-1GL-1IN-1

5-20 SYNCHRONIZATION OF DIGITAL FACILITIESIf there one or more clocks in the network at the lowest stratum level, the following steps can betaken to d

SYNCHRONIZATION OF DIGITAL FACILITIES5-21RULE 2:A node may use a facility as a backup only if the node at the other end is not using that same facilit

5-22SYNCHRONIZATION OF DIGITAL FACILITIESDIGITAL TRANSMISSION FACILITYPRIMARY FREQUENCY REFERENCESECONDARY (BACKUP) FREQUENCY REFERENCYFigure 5-14. I

SYNCHRONIZATION OF DIGITAL FACILITIES5-23Facility rank ordering is generally based on limited technical and operational information. It isrecommended

5-24SYNCHRONIZATION OF DIGITAL FACILITIESDIGITAL TRANSMISSION FACILITYPRIMARY FREQUENCY REFERENCESECONDARY (BACKUP) FREQUENCY REFERENCEFigure 5-16. L

SYNCHRONIZATION OF DIGITAL FACILITIES5-25DIGITAL TRANSMISSION FACILITYPRIMARY FREQUENCY REFERENCESECONDARY (BACKUP) FREQUENCY REFERENCEFigure 5-17. E

5-26SYNCHRONIZATION OF DIGITAL FACILITIESRULE 7:The number of nodes receiving synchronization reference from any given node should be minimized.EXAMPL

SYNCHRONIZATION OF DIGITAL FACILITIES5-27DIGITAL TRANSMISSION FACILITYPRIMARY FREQUENCY REFERENCESECONDARY (BACKUP) FREQUENCY REFERENCEFigure 5-20. M

5-28SYNCHRONIZATION OF DIGITAL FACILITIESAVAILABILITY OF SYNCHRONIZATION SOURCESMisconception 1Fact 1Misconception 2Fact 2Misconception 3Fact 3Misconc

SYNCHRONIZATION OF DIGITAL FACILITIES5-29CONCLUSIONS ON SYNCHRONIZATIONMake no assumptions regarding synchronization. Reverify items such as the avail

xiiCONTENTSLIST OF FIGURESFigure 1-1.Figure 1-2.Figure 1-3.Figure 1-4.Figure 1-5.Figure 1-6.Figure 1-7.System 85 R2V4 ISDN ConfigurationGeneric 2 ISDN

5-30SYNCHRONIZATION OF DIGITAL FACILITIESLine+Trunk Mode DS1/DMI-BOS (ANN35 or TN767 with TN555)Regarding the use of a line+trunk mode DS1/DMI-BOS for

SYNCHRONIZATION OF DIGITAL FACILITIES5-31The slip count provided by the interface should also be used in the process of choosing a healthyclock refere

5-32SYNCHRONIZATION OF DIGITAL FACILITIES

6. PORT TYPES/INSTALLATION COMPATIBILITIESThis chapter describes the operating modes, installation compatibilities, and port types supported byDS1s. B

6-2PORT TYPES/INSTALLATION COMPATIBILITIESGeneric 1, Generic 2, CEM, or D4-channel bank). The other line-interface unit connects to theNCTE and T1 fac

PORT TYPES/INSTALLATION COMPATIBILITIES6-3Application issues about the ANN11C and ANN11E are summarized below.a.It is not necessary to administer a DM

6-4PORT TYPES/INSTALLATION COMPATIBILITIESAlthough the D4-channel bank is compatible with other devices using D4 standards, its most frequentapplicati

PORT TYPES/INSTALLATION COMPATIBILITIES6-5interface, they differ in their analog voice interfaces (2- or 4-wire) and in the type of E&M (analog)si

6-6PORT TYPES/INSTALLATION COMPATIBILITIESbackplane pins 208 and 224. For J58888N1 List 2 Modification C or later, the carrier ismanufactured with the

PORT TYPES/INSTALLATION COMPATIBILITIES6-7A carrier equipped with two line+trunk DS1s will have four slots available for other port boards inphysical

CONTENTSxiiiFigure 5-17.Figure 5-18.Figure 5-19.Figure 5-20.Figure 6-1.Figure 6-2.Figure 7-1.Figure 7-2.Figure 7-3.Figure 7-4.Figure 7-5.Figure 7-6.Fi

6-8PORT TYPES/INSTALLATION COMPATIBILITIESSLOT NUMBERS012 3LEFT HALF CARRIER5 6781314151618192021RIGHT HALF CARRIERLINE-ONLYANYEMPTYEMPTYOTHERDS1 OR D

PORT TYPES/INSTALLATION COMPATIBILITIES6-9CARRIER SLOTS0 12356 781314151618192021EMPTYEMPTYEMPTYOTHERANALOGPORTCIRCUITPACKLINE+TRUNK MODEORTRUNK MODEC

6-10PORT TYPES/INSTALLATION COMPATIBILITIESLine+Trunk Mode Port Grouping RulesAdministration permits assignment of DS1 trunk types in consecutive grou

PORT TYPES/INSTALLATION COMPATIBILITIES6-11interface. They differ in their analog voice interfaces (2- or 4-wire) and in what type of E&M(analog)

6-12PORT TYPES/INSTALLATION COMPATIBILITIESLoop-Start CO TrunkGeneric 2 does not provide an analog equivalent of a DS1 loop-start CO trunk. It is only

PORT TYPES/INSTALLATION COMPATIBILITIES6-13channel signaling bits must be passed directly between two DS1/DMI ports without any switchprocessing softw

6-14PORT TYPES/INSTALLATION COMPATIBILITIESPort Grouping RulesThere are no port grouping restrictions for DMI-MOS trunks.Supported Port TypesThe DMI-M

7. ADMINISTRATION OPTIONS AND REQUIREMENTSAdministering DS1/DMI/ISDN-PRI services involves configuring the software translations to knowwhat the equip

7-2ADMINISTRATION OPTIONS AND REQUIREMENTSGeneric 1 may be administered from a Manager I terminal or by the Initialization andAdministration System (I

ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 85 7-3SYSTEM 85 (R2V1 THROUGH R2V4)This part describes administration options and requirements fo

xivCONTENTSFigure 7-20.Figure 7-21.Figure 7-22.Figure 7-23.Figure 7-24.Figure 7-25.Figure 7-26.Figure 7-27.Figure 7-28.Figure 7-29.Figure 7-30.Figure

7-4ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 85Procedure 276 Word 1: Other Feature GroupsProcedure 276, word 1, may be displayed to verify whic

ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 857-5ENHANCED MODE - PROCEDURE: 250, WORD: 1CARRIERSCARRIER LOCATIONLOCAL RMI LOCATION1.2.3.Module:

7-6ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 85Field 4V1-V4Translates a particular type of carrier (such as DS1/MFAT, module control, orTMS) to

ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 857-7System 85 R2V1 and V2 only provide trunks. However, R2V3 and V4 provide trunks, analog OPSlines

7- 8ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 85Field 5V1-V2For DS1, 0 is the only choice.V3-V4This field is reserved for further use and cont

ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 857-9Field 8V1-V4Offers the choice of 24th-channel or robbed-bit signaling (RBS). The choice ofsignal

7-10ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 85Field 9V1-V4Determines which line-coding format will be used to forcibly ensure that the datame

ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 857-11Field 10V1-V4This options enables (1) or disables (0) switching between the primary, secondary,

7-12ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 85slip count of 44 or less and if the secondary and 50% of those DS1s that are enabledfor slip en

ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 857-13Field 14V3-V4Field encodes and their descriptions are:0Selects the DS1/DMI-BOS channels used fo

CONTENTS xvFigure 7-44.Figure 7-45.Figure 7-46.Figure 7-47.Figure 7-48.Figure 7-49.Figure 7-50.Figure 7-51.Figure 7-52.Figure 7-53.Figure 7-54.Figure

7-14ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 85Also, the facility cannot be used as a synchronization reference.When a DS1 is administered for

ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 857-15Field 15 V4 OnlySome applications require that the contents of the D-channel be inverted toguar

7-16ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 85Procedure 262 Word 1: ISDN Board ParametersProcedure 262 is used in System 85 R2V4 and Generic

ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 857-17Field 5V4 OnlyAssigns the interface type or side. The default option is (0) for user side.Alter

7-18ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 85Field 7V4 OnlyThis field will accept encodes within the range of 0 through 126. However, allpoi

ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 857-19ENHANCED MODE - PROCEDURE: 354, WORD: 3NPA-NXX ASSIGNMENT1.2.3.4.NPA-NXX Designator:NPA:NXX:T

7-20ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 85Field 4 of procedure 000, word 4, need not be translated when the switch does not transmit SID

ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 857-21ENHANCED MODE - PROCEDURE: 210, WORD: 2CONSOLE ASSIGNMENTS - ATTENDANT PARTITIONS1.2.3.4.5.Co

7-22ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 85Procedure 010 Word 4: Line Side (B-Channel) BC and ISDN Routing OptionsFigure 7-9, Procedure 0

ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 857-23Field 3This field is used to populate the BC code IE. All endpoints (such as analog linesand DC

xviCONTENTSFigure 7-76.Figure 7-77.Figure 7-78.Figure 7-79.Figure 7-80.Figure 8-1.Figure A-1.Figure A-2.Figure A-3.Figure A-4.Figure A-5.Figure A-6.Fi

7-24ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 85ENHANCED MODE - PROCEDURE: 100, WORD: 1TRUNK GROUP TRANSLATION1.Trunk Group:DIAL ACCESS CODE/

ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 857-25Incoming ISDN dynamic trunk type 120 calls (to a System 85) may or may notspecify an NSF. Gener

7-26ADMINISTRATION OPTIONS AND REQUIREMENT’S — SYSTEM 85For an ISDN trunk group, a dynamic trunk type (120) can be assigned to the group.This trunk ty

ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 857-27ENHANCED MODE - PROCEDURE: 100, WORD: 3TRUNK GROUPS - MODEM POOLING AND BCCOS1.Trunk Group:MO

7-28ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 85ENHANCED MODE - PROCEDURE: 100, WORD: 3TRUNK GROUPS - SIGNALING AND OTHER PARAMETERS1.2.3.4.5

ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 857-29Field 4 Retry permits multiple attempts to seize a busy trunk from the specified trunkgroup.Thi

7-30ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 85Field 8Selects whether the optional ISDN information is transmitted and access to otherISDN net

ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 857-31ENHANCED MODE - PROCEDURE: 101, WORD: 1TRUNK GROUP CHARACTERISTICS1.2.3.4.5.6.7.8.9.Trunk Gro

7-32ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 85Fields 6-7Selects in/out touch-tone availability. Field encodes and their descriptions are:01Wh

ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 857-33Field 15 The APLT type services are not applicable in the ISDN-PRI environment.Therefore, for t

CONTENTSxviiLIST OF TABLESTABLE 1-1.TABLE 1-2.TABLE 1-3.TABLE 3-1.TABLE 4-1.TABLE 4-2.TABLE 5-1.TABLE 6-1.TABLE 7-1.TABLE 7-2.TABLE 7-3.TABLE 7-4.TABL

7-34ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 85ENHANCED MODE - PROCEDURE: 103, WORD: 1NETWORK TRUNK GROUP TRANSLATION1.2.3.4.5.6.7.8.9.Trunk

ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 857-35Field 15V4 OnlyUsed for non-ISDN trunk groups that interwork to ISDN trunk groups. Therefore,fi

7-36ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 85 ENHANCED MODE - PROCEDURE: 116, WORD: 1DS1 AND ISDN TRUNK ASSIGNMENTSEQUIPMENT LOCATION1.2.3

ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 857-37TABLE 7-3. DS1/ISDN-PRI Administration — Channel Versus Trunk AssignmentsDS1 Channel Slot/Circ

7-38ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 85Field 8Disables a channel’s signaling. Field encodes and their descriptions are:–01(Dash) used

ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 857-39ENHANCED MODE - PROCEDURE: 012, WORD: 1NAME DATABASE - NAME TO BE DISPLAYED1.2.3.4.5.6.Extens

7-40ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 85Field 4The main function of this field is to provide some administration control over whatis di

ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 857-41ENHANCED MODE - PROCEDURE: 012, WORD: 2NAME DATABASE - ENTRY1.Segment:CHARATER ENCODES2.3.4.5

7-42ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 85ENHANCED MODE - PROCEDURE: 012, WORD: 3NAME DATABASE COMPACTION1.Compact:DISPLAY ONLY2.Names

ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 857-43ENHANCED MODE - PROCEDURE: 309, WORD: 1ARS - ROUTE TABLES1.2.3.4.5.6.7.8.9.10.11.12.ARS Plan:

xviiiCONTENTSTABLE C-3.TABLE C-4.TABLE D-1.TABLE D-2.TABLE D-3.TABLE D-4.User-to-User IE OpcodesC-12Codeset Map Number to Incoming and Outgoing Transl

7-44ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 85Procedure 309 Word 5: ARS and ISDN Trunk — Network CharacteristicsThis procedure is required fo

ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 857-45Field 4 Translates ISDN trunk type 120 only. Recall that for ISDN applications the trunktype ma

7-46ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 85Procedure 321 Word 1: AAR Assignments and IXC/ISDN Network IdentifierThis procedure is used for

ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 857-47Field 10Specifies either the number (designation) of the interexchange carrier (IXC) or theISDN

7-48ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 85Field 1 Specifies the AAR pattern number. Permitted encodes are 1 through 640.Field 2 Specifies

ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 857-49ENHANCED MODE - PROCEDURE: 107, WORD: 1ATMS - TERMINATING TEST LINE ASSIGNMENT1.2.Trunk Group

7-50ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 85ENHANCED MODE - PROCEDURE: 108, WORD: 1ISDN TERMINATING TEST LINE ASSIGNMENT1.Trunk Group:TER

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 27-51GENERIC 2Depending on whether the switch provides private network ISDN service or public networ

7-52ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 2Field 14 For Generic 2, field 14 must always be translated. Field encodes and theirdescriptions

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 27-53Procedure 250 Word 1: SC/DS1 — Carrier DesignationThis procedure is used to assign the equipme

ABOUT THIS DOCUMENTPURPOSEOver the past several years, basic digital signal level 1 (DS1) service has evolved to include newcapabilities and thereby s

7-54ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 2Field 4Translates a particular type of carrier (such as DS1/MFAT, module control, orTMS) to the

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 27-55ENHANCED MODE - PROCEDURE: 260, WORD: 1DS1/ISDN AND RG CIRCUIT PACK ASSIGNMENTSEQUIPMENT LOCA

7-56ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 2Fields 1-4Assigns the circuit pack to an equipment location. Table 7-6, Equipment Parametersan

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 27-57Field 7This field is functionally equivalent to the Per-Channel Signaling and commonchannel sig

7-58ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 2Field 9 Assigns the line coding format that will be used to forcibly ensure that the datameets

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 27-59Field 10Offers the options slip enable (1) or disable (0). This option enables/disablescollecti

7-60ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 2Criteria for Switching Back to the PrimaryField 11Field 12At the end of the 1-hour interval, th

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 27-61Field 13Assigns whether a DS1 facility (translated in field 12) is to be used as the primary or

7-62ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 2Field 14Field encodes and their descriptions are:01Assigns that the DS1/DMI-BOS channels can be

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 27-63Field 15Some applications require that the contents of the signaling channel or the ISDN-PRI D-

NOTICEWhile reasonable efforts were made to ensure that the informationin this document was complete and accurate at the time of printing,AT&T can

xxABOUT THIS DOCUMENTINTENDED AUDIENCESSince this document contains information ranging from the brief tutorial to the detailed requirements,it should

7-64ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 2Field 18Loop length refers to the total cable distance between the switch and the NCTE,CDM, BCM

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 27-65Field 20This display-only field serves to show which cables contain which synchronizationcables

7-66ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 2Field 6 Assigns the interface type or side. The default option is (0) for user side.Alternately

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 27-67Field 9The field accepts encodes from 0 through 255, which correspond to 1 secondintervals for

7-68ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 2ENHANCED MODE - PROCEDURE: 262, WORD: 2ISDN NFAS/D-CHANNEL BACKUP1.D-Channel Group Number:PRI

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 27-69Procedure 262 Word 3: ISDN-PRI Codeset Map AssignmentsDepending on the terminating switch it ma

7-70ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 2Field 7Assigns whether hyperactivity management will be enabled for the ISDN-PRI link.Hyperacti

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 27-71Procedure 280 Word 1: ISDN-PRI Receive/Transmit Codeset MappingThis procedure is used to transl

7-72ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 2Field 3 Specifies a mapped from codeset number. Permitted encodes are 0 to 7. Thesenumbers corr

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 27-73NOTE: This word need not be translated unless the application requires that SID or theconnecte

ABOUT THIS DOCUMENTxxi6.PORT TYPES/INSTALLATION COMPATIBILITIES — Describes the DS1/DMI circuit packoperating modes, slot restrictions, and administra

7-74ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 2Procedure 000 Word 4: NPA-NXX Index DesignatorDepending on how the switch is used, procedure 00

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 27-75Field 3 Assigns the extension partition identification for the tenant services feature. Thisnum

7-76ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 2Field 3 Assigns the one console in the attendant partition that will be the controllingconsole.

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 27-77ENHANCED MODE - PROCEDURE: 014, WORD: 1BEARER CAPABILITY CLASS OF SERVICE - CALL OPTIONS1.2.3

7-78ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 2Fields 4-13The translation parameters administered for fields 4 through 13 determine whataction

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 27-79ENHANCE MODE - PROCEDURE: 014, WORD: 2BEARER CAPABILITY CLASS OF SERVICE - DATA OPTIONS1.Bear

7-80ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 2Procedure 010 Word 4: Line Side (B-Channel) BC and ISDN Routing OptionsFigure 7-38, Procedure

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 27-81Field 3All endpoints (such as analog lines and DCP voice terminals) must show theirinformation

7-82ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 2ENHANCED MODE - PROCEDURE: 100, WORD: 1TRUNK GROUP TRANSLATION1.Trunk Group:DIAL ACCESS CODE/

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 27-83Field 6Defines the trunk type of a specific trunk group. The ISDN-PRI facilities may beused to

xxiiABOUT THIS DOCUMENTHOW TO USE THIS DOCUMENTHow you will use this document will depend on several factors such as the amount of training youhave re

7-84ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 2This trunk type allows flexibility in processing calls as opposed to a fixed static trunk type.

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 27-85ENHANCED MODE - PROCEDURE: 100, WORD: 2TRUNK GROUP - MODEM POOLING AND BCC1.2.Trunk Group:Bea

7-86ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 2Procedure 100 Word 3: ISDN Trunk Group Signaling OptionsThe trunk type and signaling type attri

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 27-87Field 4 Retry permits multiple attempts to seize a busy trunk from the specified trunkgroup.Thi

7-88ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 2Field 8 Permits user control of whether the optional ISDN information is transmitted andwhether

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 27-89ENHANCED MODE - PROCEDURE: 101, WORD: 1TRUNK GROUP CHARACTERISTICS1.2.3.4.5.6.7.8.9.Trunk Gro

7-90ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 2Field 8 Assigns or not assign the trunk group to SMDR record keeping. Field encodes andtheir de

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 27-91ENHANCED MODE - PROCEDURE: 103, WORD: 1NETWORK TRUNK GROUP TRANSLATION1.2.3.4.5.6.7.8.9.Trunk

7-92ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 2Procedure 116 Word 1: DS1/DMI/ISDN-PRI Trunk AssignmentsFor more information, see the chapter i

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 27-93TABLE 7-10. DS1/ISDN-PRI Administration — Channel Versus Trunk AssignmentsDS1 ChannelSlot/Circ

ABOUT THIS DOCUMENT xxiiiChannel Division Multiplexer Installation and Maintenance Manual365-165-101ISChannel Expansion Multiplexer Installation and M

7-94ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 2Field 10012Field 11Assigns the function of the terminating endpoint. Field encodes and theirdes

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 27-95Field 1 Assigns either an extension number, vector directory number, or trunk group. Fieldencod

7-96ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 2ENHANCED MODE - PROCEDURE: 012, WORD: 2NAME DATABASE - ENTRY1.Segment:CHARACTER ENCODES2.3.4.

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 27-97ENHANCED MODE - PROCEDURE: 012, WORD: 3NAME DATABASE COMPACTION1.Compact:DISPLAY ONLY2.3.4.Na

7-98ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 2ENHANCED MODE - PROCEDURE: 279, WORD: 1NETWORK-SPECIFIC FACILITY1.ISDN Network Service Value:I

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 27-99TABLE 7-11. Network Services/Network FeaturesNAME NetworkParameterized (0)Feature (0)FacilityS

7-100ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 2Procedure 309 Word 1: ARS Route TablesThis procedure is used for translating/controlling the A

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 27-101Field 12Specifies the number (designation) of the interexchange carrier (IXC)/ISDNNetwork Iden

7-102ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 2Fields 1-3The ISDN-PRI does not place any new or additional considerations on translatingthese

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 27-103ENHANCED MODE - PROCEDURE: 321, WORD: 1AAR - ROUTE TABLES1.2.3.4.5.6.7.8.9.Pattern Number:Pr

xxivABOUT THIS DOCUMENT

7-104ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 2Procedure 321 Word 5: AAR–ISDN and Other Feature ParametersThis procedure is required for tran

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 27-105Field 5Assigns a BCCOS to the preference. Permitted numbers include any previouslydefined BCC

7-106ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 2Procedure 108 Word 1: ISDN Trunk Group TTL Number (Digits)This procedure is used to assign the

ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 757-107SYSTEM 75 (R1V2 AND R1V3)System 75 has the same facility considerations (framing, signaling, l

7-108ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 75Location A display-only field specifying the carrier and slot of a DS1.Name The name as shown

ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 757-109SignalingThe default option is common-channel. This option is the same as 24th-channel orModeA

7-110ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 75Maintenance Options or ParametersSlipThis option enables (y) or disables (n) switching between

ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 757-111SYNCHRONIZATION PLANPage 1 of 1SYNCHRONIZATION SOURCE (DS1 circuit pack location)Primary:___Se

7-112ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 75Trunk Group/Trunk Group MembersFor System 75 R1V2 and R1V3, there are three applications for a

ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 757-113Trunk TypeEstablishes the physical type of incoming and outgoing trunks. For tie trunk(in/out)

1. INTRODUCTIONDigital signal level 1 (DS1) trunks (trunks that carry 24 multiplexed channels on a single 1.544M-bpsstream and use a bit-oriented sign

7-114ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 75The DS1/DMI trunks are defined by using the TRUNK GROUP screen. This screen is somewhatequiv

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 17-115GENERIC 1Generic 1 has the same DS1 facility considerations (such as framing, signaling, line

7-116ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 1DS1 CIRCUIT PACKPage 1 of 1Location:Line Compensation:Framing Mode:DMI-BOS?___1esfyName:Zero C

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 17-117Location A display-only field specifying the carrier and slot of the DS1 Interface.Name The na

7-118ADINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 1Signaling The default option is common-channel. This option is the same as 24th-channel orModeA

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 17-119Interface This field is not available unless the Connect field is translated pbx. Field enco

7-120ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 1SYNCHRONIZATION PLAN Page 1 of 1SYNCHRONIZATION SOURCE (DS1 circuit pack location)Primary:___S

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 17-121Trunk Group/Trunk Group Members — DS1 Trunk ApplicationsFor DS1/DMI applications the TN722_ ci

7-122ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 1BCCThis field is only displayed when ISDN-PRI is enabled on the SYSTEM PARAMETERSCUSTOMER-OPTI

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 17-123TRUNK GROUPPage 2 of 9ACA Assignment?Short Holding Time(secs.):MIS Measured?n10nLong Holding T

1-2INTRODUCTIONThe bit stream of the DS1 protocol (1s and 0s) is transported over a DS1 line in a special way. The1s are represented as alternating p

7-124ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 1PortThis field associates each trunk group member to a particular network (1 or 2),carrier (A-

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 17-125DATA MODULEPage 1 of 1Data Extension:______Type: procr-infcPhysical Channel:___Name:_________

7-126ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 1PROCESSOR CHANNEL ASSIGNMENT Page 1 of 4ProcChanInterfaceLinkChanRemoteProcChanAppl. PriorityM

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 17-127INTERFACE LINKSPage 1 of 1Link EnableEstConnPIExtDestinationDigitsBrdDTE/DCEProtIdentification

7-128ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 1Trunking Considerations — ISDN-PRI ApplicationsIt is necessary to determine those types of ISD

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 17-129accommodated with a single trunk group, and that trunk group is provided with allocation andsc

7-130ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 1FacilityThe ISDN-PRI specification further requires that each service or feature beCodingident

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 17-131Only the new ISDN-PRI service application fields or those fields that require special or addit

7-132ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 1SendDisplay/TCMin Codeset6/7MaxMessage Sizeto SendThis field maps the display information (cod

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 17-133TRUNK FEATURESPage 2 of 11ACA Assignment?Short Holding Time (secs.):MIS Measured?Used For DCS?

INTRODUCTION1-3The term ISDN refers to the collection of international recommendations that are evolving towardadoption as a CCITT telecommunication

7-134ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 1Send NameThis field determines whether the calling (originating) party’s administered name iss

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 17-135CalledGenerally, this field only specifies some of the leading digits that are contained inNum

7-136ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 1InsertThe digits inserted before the Called Party Number IE. This specifies the digitsprepende

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 17-137●Called Number field is specified with M leading digits, where M is a number of digits less t

7-138ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 1Case 4●●●Service/Feature field is specified (for example, mega800).Called Len field is not s

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 17-139●●Called Len field is not specified (that is, left blank).Called Number field is not specifie

7-140ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 1NOTE: Although each usage allocation plan may contain up to 10 entries, a givenService/Featur

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 17-141Min# ChanThis field reserves a specified number of trunk group members that are to always beav

7-142ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 1CBC TRUNK GROUP USAGE ALLOCATION PLAN ASSIGNMENT SCHEDULEPage 4 of 11Usage Method:Fixed?Schedu

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 17-143Act TimeSpecifies the time that the associated usage allocation plan will become effective.Tim

1-4INTRODUCTIONThe BRI terminates at a subscriber’s residence or office. There, it connects either to an ISDNcompatible terminal or to a conventional

7-144ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 1PortThis field associates each trunk group member to a particular network (1 or 2),carrier (A-

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 17-145Permitted entries are single digit numbers less than or equal to the numberadministered in the

7-146ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 1SID PREFIX TABLEPage 1 of 5ExtLenExtCodeSIDPrefixExtLenExtCodeSIDPrefixExtLenExtCodeSIDPrefix5

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 17-147ROUTING PATTERNSPage 1 of 1Pattern Number:__Pattern Assignments (Enter Up To 6)Grp.No.FRLNPAPr

7-148ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 1Prefix MarkThis field is only used for public network (ARS) applications.The Prefix Mark relat

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 17-149BCC ValuesEach routing pattern preference (1 through 6) has an associated BCC Value field.The

7-150ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 1HUNT GROUPPage 1 of 6Group Number:Group Name:Security Code:Queue?ISDN Caller Disp:____________

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 17-151TERMINATING EXTENSION GROUPPage 1 of 1Group Number:Group Name:Security Code:ISDN Caller Displa

7-152ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 1

8. MAINTENANCE AND ALARMSThis chapter describes general maintenance items. For solutions to other problems not covered inthis chapter or for additiona

INTRODUCTION1-5Figure 1-1. System 85 R2V4 ISDN ConfigurationGeneric 2 provides a signaling method called nonfacility-associated signaling (NFAS). NF

8-2MAINTENANCE AND ALARMSmaintenance activities. Digital circuit packs are able to detect and report errors occurring on boththe circuit pack itself a

MAINTENANCE AND ALARMS8-3When procedure 620 is used the following points should be understood:●●●Procedure 620 consists of five separate tests, ident

8-4MAINTENANCE AND ALARMS●●Tests 4 and 5 will light the red LED on the circuit pack when facility errors cause procedure620 to fail. Depending on the

MAINTENANCE AND ALARMS8-53Demand maintenance busy (busy-out from a procedure)4Auto maintenance busy (busy-out from call processing)5Far-end maintenanc

8-6MAINTENANCE AND ALARMSGENERIC 1 MAINTENANCE CAPABILITIES AND CONCERNSGeneric 1 provides the same functional maintenance capabilities (such as error

MAINTENANCE AND ALARMS8-7Summary of Generic 1 Maintenance CapabilitiesSince Generic 1 implements the same DS1, DMI, and ISDN-PRI protocols as Generic

8-8MAINTENANCE AND ALARMSFacility AlarmsThere are several types of facility alarms that may arise. These are briefly described next.Excessive SlipsDat

MAINTENANCE AND ALARMS8-9One frequent cause of this alarm is an incorrect setting of the framing option at one end of thetransmission facility (for ex

8-10MAINTENANCE AND ALARMSBlue AlarmThe blue alarm shows that maintenance activities are in progress and that the out-of-service conditionexists for t

A. ADMINISTRATION REQUIREMENTSThe following screens detail System 75 (R1V2 and R1V3) special-access administration requirementsfor implementing a Soft

CONTENTSABOUT THIS DOCUMENTPURPOSEINTENDED AUDIENCESPREREQUISITE SKILLS AND KNOWLEDGEHOW THIS DOCUMENT IS ORGANIZEDHOW TO USE THIS DOCUMENTTRADEMARKS

1-6INTRODUCTIONFigure 1-2. Generic 2 ISDN Network ConfigurationGeneric 1 and Generic 2 provide ISDN-PRI but do not support wideband channels. Additio

A-2ADMINISTRATION REQUIREMENTSLineRelates to the distance between the switch and the network channel-terminatingCompensationequipment (NCTE), channel-

ADMINISTRATION REQUIREMENTSA-3TRUNK GROUP Page 1 of 5Group Number:Group Name:Direction:Dial Access?Queue Length:Comm Type:(number assigned)MEGACOM 800

A-4ADMINISTRATION REQUIREMENTSTRUNK GROUP Page 1 of 5Group Number:Group Name:Direction:Dial Access?Queue Length:Comm Type:(number assigned)MEGACOM 800

ADMINISTRATION REQUIREMENTSA-5TRUNK GROUP Page 1 of 5Group Number:Group Name:Direction:Dial Access?Queue Length:Comm Type:(number assigned)Group Type:

A-6 ADMINISTRATION REQUIREMENTSSecondaryPrimarySystem 75 must obtain synchronization timing from a 4ESS. Typically, thecarrier slot location for the D

B. SAMPLE INSTALLATION AND MAINTENANCE PROBLEMSBased on field experience, most problems can be categorized into three general areas:●Translations-base

B-2SAMPLE INSTALLATION AND MAINTENANCE PROBLEMS●Versatility●Complexity of installation●Administration●Operation●Type of alarmsWhen a DS1/DMI facility

SAMPLE INSTALLATION AND MAINTENANCE PROBLEMSB-3OPTIONS:OPTIONS:●●●●D4 FRAMINGPER-CHANNEL SIGNALINGROBBED-BIT SIGNALINGZCSCHANGEDFROMFIGURE B-1●●●●D4 F

B-4SAMPLE INSTALLATION AND MAINTENANCE PROBLEMSLOCATION ADS1INTERFACELOCATION BDS1INTERFACECHANNEL 1CHANNEL 25/06/0TYPE 36...TYPE

SAMPLE INSTALLATION AND MAINTENANCE PROBLEMSB-5the REC or NEC to ensure compatibility between these devices and the associatedcommunications systems.C

INTRODUCTION1-7Figure 1-3. Generic 1 ISDN Network ConfigurationChannelsEach channel transports 8-bit words (signal samples). Signal samples repeat at

B-6SAMPLE INSTALLATION AND MAINTENANCE PROBLEMSSYSTEM 75 OR SYSTEM 85 OPTIONS:OTHER ENDPOINT OPTIONS:●●●●D4 OR ESF FRAMINGPER-CHANNEL SIGNALINGROBBED-

SAMPLE INSTALLATION AND MAINTENANCE PROBLEMSB-7SYSTEM 75 OR SYSTEM 85INTERFACE A OPTIONS:●D4 OR ESF FRAMING●PER-CHANNEL SIGNALING●ROBBED-BIT SIGNALING

B-8SAMPLE INSTALLATION AND MAINTENANCE PROBLEMS----SYSTEM 75/SYSTEM 85 OPTIONS:●D4 FRAMING●PER-CHANNEL SIGNALING●ROBBED-BIT SIGNALING●ZCSD4-CHANNEL BA

SAMPLE INSTALLATION AND MAINTENANCE PROBLEMSB-9Loss of or No SynchronizationWithout synchronization, a digital interface runs on its own internal cloc

B-l0 SAMPLE INSTALLATION AND MAINTENANCE PROBLEMSDS1 OR DMIINTERFACEDS1 OR DMIINTERFACEPRIMARY REFERENCELOCATION APRIMARY REFERENCELOCATION BFigure B-

SAMPLE INSTALLATION AND MAINTENANCE PROBLEMSB-11common equipment shelf of the D4. External timing may only be optioned from the OIU-2. Looptiming shou

B-12SAMPLE INSTALLATION AND MAINTENANCE PROBLEMSDigital CO Synchronization ProblemsSynchronization of DS1 links into a digital CO presents far fewer p

SAMPLE INSTALLATION AND MAINTENANCE PROBLEMSB-13for System 85s that are configured with the ANN11C version 8 or later circuit pack. Figure B-15,Synchr

B-14SAMPLE INSTALLATION AND MAINTENANCE PROBLEMSTo fix these problems and establish compatibility across several products, new cable groups weredevelo

SAMPLE INSTALLATION AND MAINTENANCE PROBLEMSB-15TABLE B-2. System 75 Versus System 85 Cable ComparisonsCABLE/CONNECTORS(INITIAL OR OLD)(PDS COMPATIBLE

1-8INTRODUCTIONVoiceAnalog voice date is encoded into 64K-bps pulse-code modulation (PCM)samples using an encoding technique known as the Mu-255 law.

B-16SAMPLE INSTALLATION AND MAINTENANCE PROBLEMSTable B-3, 15-Pin Connector Arrangement (System 75/85 Perspective), shows the 15-pin connectorarrang

SAMPLE INSTALLATION AND MAINTENANCE PROBLEMSB-17TABLE B-4. 8-Position Modular Jack Pin Assignments (System 75 and System 85 Perspective)DS1 OR DMI PIN

B-18SAMPLE INSTALLATION AND MAINTENANCE PROBLEMSSystem 85 DS1/DMI to System 85 DS1/DMI — Colocated ArrangementHow this connection is made depends on t

SAMPLE INSTALLATION AND MAINTENANCE PROBLEMSB-19Permitted Cabling Combinations Using PDSUsing cable GR-380:NOTE: When using PDS wiring, the easiest ap

B-20SAMPLE INSTALLATION AND MAINTENANCE PROBLEMSSystem 85 DS1/DMI to System 75 DS1/DMI — Colocated ArrangementPermitted Cabling CombinationsUsing cabl

SAMPLE INSTALLATION AND MAINTENANCE PROBLEMSB-21System 85 DMI to Host ComputerPermitted Cabling CombinationsUsing cable GR-380:ANN11D/EANN11D/E↔↔[335-

B-22SAMPLE INSTALLATION AND MAINTENANCE PROBLEMSSystem 85 DS1/DMI Direct to a NCTEPermitted Cabling CombinationsUsing Cable GR-380:ANN11C/D/EANN11C/D/

C. ADMINISTRATION PROCEDURE SUMMARYThis appendix examines administrative procedures in DEFINITY® Generic 2 that relate to ISDN-PRI. It describes how p

C-2ADMINISTRATIVE PROCEDURE SUMMARYMode 3Mode 0Voice GradeDataUnknown DigitalUnknownAnalogMode 3/2Opcode: 4 (assuming no codeset mapping)Information t

ADMINISTRATIVE PROCEDURE SUMMARYC-3X.25Opcode: 4 (assuming no codeset mapping)Information transfer capability: unrestricted digital informationCoding

INTRODUCTION1-9To properly transmit digital data, the following conditions must be met:●●●The data communications protocol must meet the 1s-density re

C-4ADMINISTRATIVE PROCEDURE SUMMARY12Use an ISDN-PRI trunk exclusively. When routed to a specific pattern, the first availableISDN trunk found in the

ADMINISTRATIVE PROCEDURE SUMMARYC-5Mode 2Mode 3Mode 0Opcode: 4Information transfer capability: restricted digital informationCoding standard: CCITTInf

C-6ADMINSTRATIVE PROCEDURE SUMMARYFor an ISDN trunk group, a dynamic trunk type (120) can be assigned to the group. This trunk typeallows the group to

ADMINISTRATIVE PROCEDURE SUMMARYC-7PROCEDURE 100 WORD 3 (System 85 R2V4 & Generic 2)Field 2Field 3Field 8Used to assign a trunk group as ISDN-PRI

C-8ADMINISTRATIVE PROCEDURE SUMMARYField 15BC (System 85 R2V4 Only). For ISDN-PRI this field comes into play on interworkedtandem calls through the sw

ADMINISTRATIVE PROCEDURE SUMMARYC-9PROCEDURE 108 WORD 1 (System 85 R2V4 & Generic 2)This procedure is used to assign the terminating test-line tel

C-10ADMINISTRATIVE PROCEDURE SUMMARYField 5 of this word specifies an interface type of network or user. For an ISDN-PRI point-to-pointlink to functio

ADMINISTRATIVE PROCEDURE SUMMARYC-11(timer value) = (N200 + 1) * T200The default value of these four timers is 4 seconds [(3 + 1) * 1].T321 is defined

C-12ADMINISTRATIVE PROCEDURE SUMMARYTABLE C-2. System 85 R2V4 to Generic 2 IE Opcode TranslationsIE Opcode ValueInformation Element (IE) NameR2V4G2Li

ADMINISTRATIVE PROCEDURE SUMMARYC-13PROCEDURE 309 WORD 5 (System 85 R2V4 & Generic 2)This word deals with the sending of a particular NSF IE in th

1-10INTRODUCTIONCircuit-Switched Versus Packet-Switched ChannelsA circuit-switched channel provides the full bandwidth of a channel to the single term

C-14ADMINISTRATIVE PROCEDURE SUMMARYNSF IE (System 85 R2V4)For System 85 R2V4, the following values can be entered into field 5:33 through 288(OUTWATS

ADMINISTRATIVE PROCEDURE SUMMARYC-15356 (WATS NSF)357 (ACCUNET viaencode 357)Opcode: 2The following three items are sent only if field 12 of procedure

C-16ADMINISTRATIVE PROCEDURE SUMMARYRules for requesting ACCUNET services from different generics of 4ESS are the same as those forSystem 85 R2V4. Tha

ADMINISTRATIVE PROCEDURE SUMMARYC-17Field 6 (Generic2)Field 16 of procedure 014, word 1, defines the BC for the calling party’s COS.Fields 4 through 1

C-18ADMINISTRATIVE PROCEDURE SUMMARYIn addition, a thousands digit can be assigned in field 4. This digit must be assigned in 3-digitswitches for the

ADMINISTRATIVE PROCEDURE SUMMARYC-19The following are ISDN-related tasks and their task numbers for System 85 R2V4:Task 35 ISDN queue server taskTask

C-20ADMINISTRATIVE PROCEDURE SUMMARY

D. TRUNK TYPE AND SIGNALING TYPE COMPATIBILITY TABLESThis appendix contains three tables that define trunk type to signaling type compatibility for Sy

D-2TRUNK TYPE AND SIGNALING TYPE COMPATIBILITY TABLESDirectionDefault SignalingEQUA1 - A4DescriptionDefines if the trunk type is capable of both

TRUNK TYPE AND SIGNALING TYPE COMPATIBILITY TABLESD-3Trunk TypeEQUFeature DirectionDefault Signaling EQUA1A2A3 A4co_2wp(20)CO2-wayground_start_w_pt(2)

INTRODUCTION1-11Figure 1-4. D4 FramingThe D4 framing is the format compatible with D4-channel banks. The D4 framing is the onlyframing format support

D-4TRUNK TYPE AND SIGNALING TYPE COMPATIBILITY TABLESTrunk TypeEQU Feature DirectionDefault SignalingEQUA1A2 A3 A4Descriptiontt-sender55NA NAno_signal

TRUNK TYPE AND SIGNALING TYPE COMPATIBILITY TABLESD-5A1A2A3A4EQU Feature DirectionDefault Signaling102NA 2-ways_channel_signalingDescriptionpooled dat

D-6TRUNK TYPE AND SIGNALING TYPE COMPATIBILITY TABLESTABLE D-2. R2V4 Alternate Signaling Type TranslationsTrunkEQU R2V4G2 Equiv.TypeSig. Type Sig. Ty

TRUNK TYPE AND SIGNALING TYPE COMPATIBILITY TABLESD-7Table D-3, Signaling Type Compatibility, provides the compatibility of standard signaling types

D-8TRUNK TYPE AND SIGNALING TYPE COMPATIBILITY TABLESTable D-4, Signaling Type Definitions, provides definitions for the signaling types used in the

ABBREVIATIONSAAARA/COADFTCAFRLAIODALUANIARSA/TOA/TTAUTOVONAVDAWGB8ZSBCBCCBCCOSbpsCBCCCITTCCRCCSACDMCEMCORCOSCRCCSUampereAutomatic Alternate RoutingAna

AB-2ABBREVIATIONSDACSdBDCED/CODCPDIDDIFDIPDMIDMI-BOSDMI-MOSDNISDPODS1DSUDSX-1DTED/TOD/TTE&MEDSLEIAEPSCSESESFFASFRLFXFXOFXSGRSHDLCHzdigital-access

ABBREVIATIONSAB-3ICIEINADSISDNISDN-BRIISDN-PRIIXCLAPDLATALDNLECLFALOSLSBMAAPMFATMOMPDMMTBFMTCPMTTRNCTENECNFASNPANSFONSOPSOPXPADPAMPCMPDMintegrated cir

AB-4ABBREVIATIONSPDSPRIRBSRECRFARGIRMATSSAOSCSSDNS/DTTSIDSLCSLIMSMTSS7TCMTEGTMSTSITTLTTTNTVCTVSUDPUUIVMAAPVNLVVBRWWATSZCSpremises distribution systemp

GLOSSARY1s density24th-channelsignaling800 serviceaccessACCUNET®ACCUNET®digital serviceACCUNET®packet serviceACCUNET®reserved 1.5serviceACCUNET®T1serv

1-12INTRODUCTIONESF FramingInitially, this format was called F , pronounced “F sub e,” for framing extended. It is now calledeextended superframe

GL-2 GLOSSARYanaloganalog/digital-facility testcircuit(ADFTC)arithmetic logicunit (ALU)asynchronousdatatransmissionAT&T ISDNbasic rateinterface (B

GLOSSARYGL-3AWGbandwidthbaudbit ratebits per second(bps)B8ZSB-channelB-channel cut-throughBCCOSBCCOS —unknownanalogBCCOS —unknown digitalbearercapabil

GL-4 GLOSSARYbinary service One of two network specific facility (NSF) service types that are administered informat conjunction with the Automatic Alt

GLOSSARYGL-5channel-divisionmultiplexer(CDM)channel-expansionmultiplexer(CEM)channelnegotiationchannel serviceunit (CSU)circuit-switchedtransport mode

GL-6 GLOSSARYclear-channelsignalingclear channeltransmissioncodepointcodesetcombination tietrunkcommon-channelinterofficesignalingcommon-channelsignal

GLOSSARYGL-7D4 framingformatD-channelDACSdata moduledata setdata serviceunit (DSU)data terminalequipment(DTE)dBDCPdecibel (dB)dialed-numberidentificat

GL-8GLOSSARYDigitalCommunicationProtocol (DCP)digitaldigital datadigitalmultiplexedinterface (DMI)digitalmultiplexedinterface withbit-orientedsignalin

GLOSSARYGL-9EIA(ElectronicsIndustriesAssociation)EDSLelectronictandem network(ETN)end-to-endISDNconnectivityEnhancedPrivateSwitchedCommunicationsServi

GL-10GLOSSARYFRLfinal trunkgroupfacilitiesrestriction level(FRL)first-choicetrunk groupfixed-loss planFlexibleAssignment ofBX.25(DCIU/SCI)Signaling Po

GLOSSARYGL-11high-volumetandemhyperactivityINADSinbandsignalinginformationelement (IE)informationtransfercapabilityinformationtransfer rateInitializat

INTRODUCTION1-13end, one framing bit is inserted in each succeeding 193rd bit-position of the DS1 signal. The receiveend uses the framing pattern to s

GL-12GLOSSARYIntegratedServices DigitalNetworkprimary rateinterface(ISDN-PRI)interexchangecarrier (IXC)interfaceinternal clockreferenceinterworkingISD

GLOSSARY GL-13ISDN SID-ANILATALFAlink-accessprocedure onthe D-channel(LAPD)local exchangecompany (LEC)Look-AheadInterflowLOSloss of framealignment(LFA

GL-14 GLOSSARYMEGACOM®800misframeMOmode 3modemmodem poolingmodularprocessor datamodule(MPDM)MPDMmultiplexerNCTEnetworkchannel-terminatingequipment(NCT

GLOSSARYGL-15networksynchronizationplannonfacilityassociatedsignaling(NFAS)off-premisesextension (OPX)off-premisesstation (OPS)ones densityOPSOPXout-o

GL-16GLOSSARYpacket-switchedtransport modepacketswitchingpacketized dataPADparameterized-service formatpartitioningPAMPC/PBXConnectionPCMPDMPDSpreferr

GLOSSARY GL-17primary rateinterface (PRI)private networkprocessor datamodule (PDM)protocoldiscriminatorpublic networkpull-in rangepulse-amplitudemodul

GL-18GLOSSARYRemote Groupremote modulerestrictedchannelrestricteddigital dataRFARGrobbed-bitsignalingSDNsecondarysynchronizationreferencesenderizedope

GLOSSARY GL-19SoftwareDefinedNetwork (SDN)special accessSS7stationidentification(SID) numberstimulussignalingswitched accesssynchronizationsynchronous

GL-20 GLOSSARYterminalbalanceTerminating-ExtensionGroup (TEG)time-multiplexedswitch (TMS)time-slotinterchanger(TSI)TMStoll officetransport modetraveli

GLOSSARYGL-21unrestrictedchannelunrestricteddigital datauser-to-userinformation(UUI) exchangeuser-to-userinformationtransferUUIvia-net loss(VNL)visual

1-14INTRODUCTIONThe CRC is used at the receive end to detect transmission errors. The CRC is calculated at thetransmit end and multiplexed into the DS

GL-22GLOSSARYzero codeA binary-coding scheme that ensures that a data stream contains at least asuppressionminimum number of information bits to ensur

INDEX11s density 1-17, 1-20224th-channel signaling 1-14, 1-15, 2-344-wire E&M extended range channel units 2-5550-pin (25-pair) connector configu

IN-2INDEXAutomatic Alternate Routing (AAR)BC 1-24called party IE 7-38CBC 7-25feature groups 7-4feature parameters 7-104ISDN dynamic trunk group C-6ne

INDEXIN-3cancelersecho 3-6CAS 1-29cascode node connections 5-24CBC Service Selection 1-28CCITTBOS specification 7-63MOS specification 7-15SS7 7-30, 7-

IN-4INDEXCOR 7-112, 7-125, A-2COS C-1BC and ISDN routing 7-80interworking 1-27translationGeneric 1 7-125Generic 2 7-51CRC 1-12, 1-14CRV 1-26CSU xix,

INDEXIN-5digital—Contdcross-connects 3-1data 1-9data transmission 7-9, 7-109, 7-118facilities, synchronization of 5-1fixed loss 4-2loss plandefiniti

IN-6INDEXDS1—ContdDMI—ContdBOSGeneric 1 6-4line-only mode 5-29line+trunk mode 5-30ISDN-PRI port losses 4-6private-network connections 2-3public-netw

INDEXIN-7foreign exchange subscriber (FXS) 4-7formatsfacility B-2four-wire E&M extended range channel unitsSee 4-wire E&M extended range chann

IN-8INDEXinterexchange carrier (IXC)—ContdSystem 85 ARS assignments 7-42internalclock reference B-9, B-11, B-12description 5-1digital network nodes 5-

INDEXIN-9loss—Contdcombination tie trunk 4-6digital 4-1DS1/DMI/ISDN-PRI 4-6extended range channel units 4-6insertion 4-1ISL digital, low 4-1of frame

INTRODUCTION1-15For AT&T proprietary signaling, a complete set of signaling information is sent every 24 frames.This 24-frame period is not synchr

IN-10INDEXmuitiplexer—ContdCEM—Contdline compensation A-2digital xx, 3-2error detection capabilities 8-5IBM IDNX 6-2, 6-3IDNX 2-4incompatibility with

INDEXIN-11Ooctet, all-0s 1-18office interface unit (OIU-2) 2-5offline module 5-8off-premisescabling 3-5station (OPS)applications 7-1channel assignmen

IN-12 INDEXpublic network connections—ContdDACS to another system 2-8DS1/DMI 2-6ISDN-PRI 2-13System 85 or Generic 2 ISDN-PRI to a5ESS 2-15System

INDEX IN-13service—Contd/facility options—ContdSystem 85 Release 2 7-7type, DMI-MOS 2-3shared channel 2-10SID-ANI 1-28, 7-128signal, preequalized 3-9

IN-14INDEXSystem 75administration options and requirements7-107and Generic 1 synchronization architecture5-11and Generic 1 synchronization softwareope

INDEXIN-15toll office—Contdpublic-network connections 2-6restrictions A-2touch-tone capability 2-6, 2-14transmissionavailability 5-22conditions, dig

IN-16 INDEXvoice-grade data—Contddefinition 1-8Generic 1 AVD trunk limitations 7-118System 75 AVD trunk limitations 7-109System 85 AVD trunk

iv CONTENTSDS1/DMI PRIVATE-NETWORK CONNECTIONSGeneric 1, Generic 2, System 75, or System 85 to Another SystemHost Computer to Another SystemIBM® IDNX

1-16INTRODUCTIONFor System 75, the TN722 provides only AT&T proprietary signaling. However, the TN722B can beadministered to provide either AT&

INTRODUCTION1-17v(t)+3t-3010110111Figure 1-7. Alternate Mark Inversion1s-Density RequirementOn the receive side, a DS1 uses the received bipolar puls

1-18INTRODUCTIONRestricted ChannelA restricted channel is a digital transmission facility restricted to transmissions in which an all-0soctet (eight

INTRODUCTION1-19UNCODEDBIT STREAM0100110000000011100000000 0000000001PULSESTREAM0+00-+000+0-+-+-000-+0+-000-+0+-0+VIOLATIONS BASED ON POLARITYOF LAST

1-20 INTRODUCTIONBipolar ViolationsAs noted earlier, the DS1 bit stream is transmitted as a series of pulses. Successive pulses, regardlessof the numb

INTRODUCTION1-21TABLE 1-2. Data-Module CapabilitiesDataModuleDMIModeUser DataRateSync/AsyncBitInvertProtocolPackagingHandshakeNotesDTDMMPDM2012300 -

1-22INTRODUCTIONThe method used to provide ACCUNET® switched digital service (used by D4-channel banks) alsomaintains the 1s-density requirement. This

INTRODUCTION1-23Bearer Capability (BC)System 85 R2V4 introduced the administration attribute known as bearer capability (BC). Theprimary function of

1-24INTRODUCTIONGeneric 1For information about how BC is done for Generic 1, refer to the AT&T DEFINITY 75/85Communications System Generic 1 and

INTRODUCTION1-25TABLE 1-3. BCCOSSwitch ParameterDefault ValueAnalog Lines0All trunks except Host Access0AAR/ARS Preferences 0Host Access trunks1DCP d

CONTENTSvSystem 85 Traditional Modules3-9Generic 1 and Generic 2 Universal Modules3-94. THE DIGITAL LOSS PLANLOSS-PLAN IMPLEMENTATION AND PROVISIONING

1-26INTRODUCTIONIncoming CallsIncoming ISDN calls are generally processed similar to outgoing ISDN calls. Initially, the calledswitch receives a setup

INTRODUCTION1-27Administration software also allows services to be dedicated to specific channels by assigning achannel to a particular trunk type. In

1-28INTRODUCTIONCBC Service SelectionCBC trunk groups eliminate the need for dedicating specific B-channels to a particular service. CBCService Select

INTRODUCTION1-29one trunk type is needed, only one trunk group is available, and conventional routing digits areinadequate for the current application

1-30INTRODUCTION5.6.7.8.Interworking between ISDN-PRI and DCS is a complex issue that is beyond the scope of thisdocument. However, for a combined ISD

INTRODUCTION1-31Full DCS feature transparency is provided between two or more Generic 2s interconnected withISDN-PRI facilities. The supported voice t

1-32INTRODUCTION

2. NETWORK CONNECTIONS AND CONFIGURATIONSThis chapter provides a description of common connection arrangements with System 85 R2V4,DEFINITY® Communica

2-2NETWORK CONNECTIONS AND CONFIGURATIONS5.6.7.Counting the number of messages and comparing this to other trunksDetermining whether a channel is hype

NETWORK CONNECTIONS AND CONFIGURATIONS2-3This means that in the exclusive case, the network’s call completes, and the user’s call must eitherwait or f

viCONTENTSLine+Trunk Mode DS1/DMI-BOS (ANN35 or TN767 with TN555)5-30DMI-MOS (ANN35 or TN767 with TN755)5-30USE OF GENERIC 1 AS A SYSTEM CLOCK REFEREN

2-4NETWORK CONNECTIONS AND CONFIGURATIONSadministrable but will not work for DMI-to-host-computer applications. Current versions of theAT&T 3B5 an

NETWORK CONNECTIONS AND CONFIGURATIONS2-5compatibility with other vendor products, operation is usually not guaranteed. The only exception tothis rule

2-6NETWORK CONNECTIONS AND CONFIGURATIONSDS1/DMI PUBLIC-NETWORK CONNECTIONSPublic-network connections may include connections to COs, DACS frames, and

NETWORK CONNECTIONS AND CONFIGURATIONS2-7Screening Intra-LATA CallsA 4ESS can be used to block within the local access and transport area (LATA). This

2-8NETWORK CONNECTIONS AND CONFIGURATIONSDACS to Another SystemThe DACS may be thought of as an “electronic patch panel” for DS1/DMI-BOS. Cross-connec

NETWORK CONNECTIONS AND CONFIGURATIONS2-9Since the D4-channel bank is located at the CO end of a DS1/DMI facility, it is the responsibility ofthe CO t

2-10NETWORK CONNECTIONS AND CONFIGURATIONSWhen CDMs are used to provide the drop and insert function, they are typically located near where aDS1/DMI-B

NETWORK CONNECTIONS AND CONFIGURATIONS2-11The assignment of CEM channels must be coordinated with the DS1/DMI-BOS channel assignmentson the switch. Th

2-12NETWORK CONNECTIONS AND CONFIGURATIONSThe method for selecting the channels that are to be compressed and the channels that are to passthrough unc

NETWORK CONNECTIONS AND CONFIGURATIONS2-13System 85 or Generic 2 ISDN-PRI to Another Vendor’s Digital SwitchWhen a System 85 or Generic 2 ISDN-PRI con

CONTENTSviiProcedure 010 Word 4:Procedure 100 Word 1:Procedure 100 Word 2:Procedure 100 Word 3:Procedure 101 Word 1:Procedure 103 Word 1:Procedure 116

2-14NETWORK CONNECTIONS AND CONFIGURATIONSDial ToneSecond dial tone may be provided by a 4ESS. However, it is recommended that the customer-premises s

NETWORK CONNECTIONS AND CONFIGURATIONS2-15Network Specific FacilityFor outgoing calls from the customer-premises side, the 4E11 and 4E12 will accept a

2-16NETWORK CONNECTIONS AND CONFIGURATIONS

3. DS1 TRANSMISSION AND CABLINGDigital signal level 1 (DS1) is the specification for a particular digital signal format. DS1 interfacesshould not be c

3-2DS1 TRANSMISSION AND CABLINGDigital transmission facilities are used to transmit digital signals from one location to another. Manydifferent digita

DS1 TRANSMISSION AND CABLING3-3●●●●●●●Monitoring of the input DS1 or, when necessary, adding pulses (1s) to ensure that the ones-density requirements

3-4DS1 TRANSMISSION AND CABLINGBecause ANN11Ds, ANN11Es, TN722Bs, and TN767s contain components that suppress unwantedemissions from a DS1, standard p

DS1 TRANSMISSION AND CABLING3-5DS1DS1655 FTMAXIMUM655 FTMAXIMUMDSX-1 PHANTOM POINTA. DIRECT DISTANCE OF 1310 FT OR LESSNCTENCTEDSX-1DSX-1DS1OFFICEREPE

3-6DS1 TRANSMISSION AND CABLINGThe customer is responsibility for maintaining NCTEs. When purchasing service from the LEC, thecustomer must specify th

DS1 TRANSMISSION AND CABLING3-7The transmission system connects to a DS1 via a DSX-1 cross-connect●●The transmission system meets any special requirem

viiiCONTENTSProcedure 101 Word 1:Procedure 103 Word 1:Procedure 116 Word 1:Procedure 012 Word 1:Procedure 012 Word 2:Procedure 012 Word 3:Procedure 27

3-8DS1 TRANSMISSION AND CABLINGDS1/DMIOR D4CHANNELBANKDSX-1DSX-1DS1/DMIOR D4CHANNELBANKCEMDSX-1ANY DS1TRANSMISSIONMEDIADSX-1CEMDS1/DMIOR D4CHANNELBANK

DS1 TRANSMISSION AND CABLING3-9LINE EQUALIZER AND COMPENSATION SETTINGSThe Generic 1 and Generic 2 DS1 circuit packs generate a signal that is preequa

3-10DS1 TRANSMISSION AND CABLING

4. THE DIGITAL LOSS PLANTransmission loss is required so that talker echo is minimized. Furthermore, transmission loss mustbe kept low enough so that

4-2THE DIGITAL LOSS PLANSome quantity of connection loss is desirable and deliberately engineered into most types oftransmission links. The quantity o

THE DIGITAL LOSS PLAN4-3TABLE 4-1. Digital Loss Plan EncodesEncode012345678Loss-Plan FunctionANSI/EIA/TIA-464-A-1989DesignatorThe digital fixed-loss

4-4THE DIGITAL LOSS PLANLoss planpbx-eia — for private-network-only applications that use analog tie trunks ordigital tie trunkspbx-low — for use wi

THE DIGITAL LOSS PLAN4-5TABLE 4-2. Digital Loss Plan (Port-to-Port Losses)TransmitDirectionReceive Direction(Values in dB Loss)ONS-LineOPS-LineANALTi

4 -6THE DIGITAL LOSS PLANswitch will have value only after verification of this switch’s port-to-port loss specification.Conformance with ANSI standar

THE DIGITAL LOSS PLAN4-7OPS PortsAnalog off-premises station (OPS) facility requirements specify a loss not to exceed 4 dB in eachdirection. To provid

CONTENTSix8. MAINTENANCE AND ALARMSGENERIC 1 AND GENERIC 2 ISDN-PRI MAINTENANCE PHILOSOPHYGENERIC 2 MAINTENANCE CAPABILITIES AND CONCERNSGeneric 2 Mai

4-8THE DIGITAL LOSS PLAN

5. SYNCHRONIZATION OF DIGITAL FACILITIESThe DS1 transmit and receive buffers (for Generic 1 and Generic 2) operate from a single external orinternal c

5-2 SYNCHRONIZATION OF DIGITAL FACILITIESFigure 5-1-A, Options for Synchronization, shows one possible connection between a pair of D4-channel bank

SYNCHRONIZATION OF DIGITAL FACILITIES5-3NOTE: The deletion or repetition of a single frame is termed a slip or a controlled slip. For anindividual

5-4SYNCHRONIZATION OF DIGITAL FACILITIES3.4.5.Minimum costsEase of administrationEase of maintenanceFor the hierarchical method, a node containing a v

SYNCHRONIZATION OF DIGITAL FACILITIES5-5MASTER REFERENCEFREQUENCYNOTESLAVE NODESDIGITAL TRUNKPRIMARY REFERENCENOTE: The dashed lines indicate which no

5-6SYNCHRONIZATION OF DIGITAL FACILITIESThe public digital network nodes and services that the AT&T private digital switches and digitalterminal p

SYNCHRONIZATION OF DIGITAL FACILITIES5-7LEGENDDIGITAL TRANSMISSION FACILITYPRIMARY FREQUENCY REFERENCESECONDARY FREQUENCY REFERENCENOTE: For System 85

5-8SYNCHRONIZATION OF DIGITAL FACILITIESTN463 CIRCUIT PACKSTRATUM 4HIGH ACCURACYCLOCKBACKPLANECABLE TOPRIMARY DS1INTERFACE(NOTE)PRIMARYREFERENCEMAINPH

SYNCHRONIZATION OF DIGITAL FACILITIES5-9a duplicated synchronization system, the same DS1 facility provides the primary and secondaryreference for bot