Telephone System Installation and Maintenance Guide

120 Chapter 11 Installing the analog terminal adapter
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Figure 50 ATA2 back view
Test insertion loss measurement
The maximum loss for ATA2 to Central Office (CO) configuration must not exceed 10 dB (see
Figure 51 on page 120).
Figure 51 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
Longitudinal balance to ground 50 dB
60 to 4,000 Hz
With IEEE 455-1976 test
Overload level 3 dB
Mounting keyhole slots
Analog telephone
ATA2
BCM50
BCM50 to ATA2
ATA2 to BCM50
10 dB Max
Cable loss
Central
Office