Nortel Networks BCM50 Test insertion loss measurement, ATA2 back view Mounting keyhole slots

120Chapter 11 Installing the analog terminal adapter

Figure 50 ATA2 back view

Mounting keyhole slots

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

BCM50	ATA2	Analog telephone
Central
Office
		Cable loss
	BCM50 to ATA2
ATA2 to BCM50
	10 dB Max

Longitudinal balance to ground	50 dB
	60 to 4,000 Hz
	With IEEE 455-1976 test
Overload level	3 dB

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

1Establish a connection to the 1 mW, 1 kHz, CO service line with an analog telephone attached to the ATA2.

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

• Replace the analog telephone with the test set

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