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Chapter 11 Installing the analog terminal adapter 171

BCM200/400 4.0 Installation and Maintenance Guide

Figure 85 Insertion loss from the CO to the analog telephone

Measure the total insertion loss between the CO and analog device by using standard dial-up test

lines with a transmission test set (for example, Hewlett-Packard 4935A Transmission Test Set).

To measure the insertion loss from the CO to the analog device

1 Establish a connection to the 1 mW, 1 kHz, CO service line with an analog telephone attached

to the ATA2.

2 Ensure that the analog port terminates correctly in 600 ohms:

• Replace the analog telephone with the test set.

• Use RECEIVE/600 OHM/HOLD mode on the test set.

3 Ensure that the test set connects in parallel to the service line before removing the analog

telephone or the line drops.

4 Remove the single-line telephone.

5 Measure the 1 kHz tone at the far end of the analog port, which is where the analog loop ends

and where the analog device connects.

To measure the insertion loss from the analog device to the CO

1 Establish a connection to a silent termination on the CO service line with an analog telephone

attached to the ATA2.

2 Make sure the analog port terminates correctly in 600 ohms:

Longitudinal balance to ground 50 dB

60 to 4,000 Hz

With IEEE 455-1976 test

Overload level 3 dB

Note: The tone must be greater than - 10 dB (for example, - 9 dB is acceptable).

Analog telephone

ATA 2

BCM main unit

BCM to ATA 2

ATA 2 to BCM

10 dB Max

Cable loss

Central Office

cable loss

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Nortel Networks BCM200 Manual de usuario Pagina 171