Nortel Networks BCM1000 manual Testing insertion loss measurement

154 Chapter 12 Installing Analog Terminal Adapters

Testing insertion loss measurement

The maximum loss for ATA 2 to Central Office (CO) configuration, shown in Figure 64, must not exceed 10 dB.

Figure 64 Insertion loss from the CO to the analog telephone

BCM1000	ATA 2	Analog telephone
Central Office
cable loss
		Cable loss
Business Communications Manager to ATA 2
ATA 2 to Business Communications Manager
	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.

For CO to analog device measurement

Use this procedure 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 ATA 2.

2Ensure that the analog port terminates correctly in 600 ohms: a Replace the analog telephone with the test set

b Use RECEIVE/600 OHM/HOLD mode on the test set

3Ensure that the test set connects in parallel to the service line before removing the analog telephone or the line drops.

4Remove the single-line telephone.

5Measure 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.)

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

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