AT&T StarLAN 10 Manual de Instruções descarregar pdf (Página 415)

100

101

Analog Transmission Characteristics (Contd)

Sampling Rate:

8 kHz

Terminating Impedance:

600 ohms

Trunk Balance Impedance:

600 ohms or Complex Z (selectable)

Echo Return Loss:

The echo return loss of the switching equipment is infinite. The echo return loss of the

station equipment can be engineered for greater than 18 db over the range of 500 Hz to

2500 HZ.

Loop Resistance:

● TN74.2—Loop resistance of up to 1300 ohms, including the station

● ZTN78—Loop resistance of up to 100 ohms not including the station

(2000 feet with No. 24 AWG.)

Connection Bandwidth: 64 Kbits

Steady State Noise Level:

The steady state noise level presented to any busy path does not exceed 23 dBrnc during

the busy hour.

Impulse Noise:

The impulse noise is 0 count (hits) in five minutes at +55 dBrnc during the busy hour.

Single Frequency Return Loss (Talking State):

Station to station—exceeds 12 db

Station to 4 wire trunk connection—exceeds 14 db

Station to 2 wire trunk connection—exceeds 12 db

Peak Noise Level:

Analog to analog—20 dBrnc

Analog to digital—19 dBrnc

Digital to analog—13 dBrnc

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AT&T StarLAN 10 Manual de Instruções Página 415

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