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Chapter 13 Install Analog Terminal Adapters 279
Installation and Maintenance Guide
Measure insertion loss
Measure the total insertion loss between the CO and voice messaging device by using standard dial
up test lines with a transmission test set. For example, Hewlett-Packard 4935A Transmission Test
Set.
Measure insertion loss between the Central office and analog device
Use this procedure to measure the insertion loss from the CO to the voice messaging device:
1 Establish a connection to the 1 mW, 1 kHz, CO service line with a single-line telephone
attached to the Business Communications Manager ATA 2.
2 Ensure that the analog port terminates correctly in 600 ohms:
a Replace the single-line telephone with the test set
b 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 single-line
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 voice messaging device connects.)
6 This procedure is complete.
Measure insertion loss from the analog device to Central Office
Use this procedure to measure the insertion loss from the voice messaging device to the CO:
1 Establish a connection to a silent termination on the CO service line with a single-line
telephone attached to the Business Communications Manager ATA 2.
2 Make sure the analog port terminates correctly in 600 ohms by:
• replacing the single-line telephone with the test set
•using
TRANSMIT/600 OHM/HOLD mode on the test set
3 Make sure the test set connects in parallel to the service line before removing the single-line
telephone or the line drops.
4 Remove the single-line telephone.
Note: The tone must be greater than - 10 dB (for example: - 9 dB is acceptable).