AT&T StarLAN 10 Manual de Instruções descarregar pdf (Página 299)

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101

The NPEs do switching network functions for the port circuits. Under control of the on-

board microprocessor, an NPE can connect a port circuit to any one of the TDM bus time

slots. More specifically, it allows a port circuit to talk on one time slot and listen to the

same time slot (NPE sidetone) and on up to four other time slots at the same time. In 2-

wire circuits that provide their own sidetone, the NPE sidetone is not used.

Circuit Pack Address Leads:

Seven leads (BA0-BA6) are tied to Corresponding logic

levels to uniquely identify each CP slot in the system, including multiple cabinet systems.

The logic values on leads BA4 and BA5 are used to identify the cabinet (Cabinet 1, 2, or 3)

and are tied via the cabinet address plugs to either +5V de or ground, as appropriate. Lead

BA6 is tied to ground.

❘

●

TDM

BUS

LEADS

CIRCUIT

PACK

ADDRESS

LEADS

NPE(S)

BUS

❘

BUFFERS

❘

●

RAM

❘

SAKI

●

❘

RED

LEDS

ON-BOARD

MICRO-

PROCESSOR

PORT

SPECIFIC

CIRCUITRY

GREEN

YELLOW

Figure 3-7. Port Circuit Pack Common Circuitry

3-15

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AT&T StarLAN 10 Manual de Instruções Página 299

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