Specifications

MULTI-FUNCTION LINE DRIVER

5.3.3 U

SING THE

V.52 BERT T

EST

NDEPENDENTLY

The Multi-Function Line Driver can perform its V.52 BERT test independently

of the V.54 loopback tests. This requires two operators: one to initiate and

monitor the test at the local MFLD, and one to do the same at the remote

MFLD. To use the V.52 BERT test by itself, both operators should

simultaneously follow these steps:

1. Move the left-hand top-panel slide switch labeled “BERT” to the “511”

(down) position. This will activate the V.52 BERT test mode and transmit

a 511 test pattern to the other unit. If any errors are present, the

receiving modem’s Error LED will blink sporadically.

NOTE

For this independent test to work properly, the “BERT” switch on both

Multi-Function Line Drivers must be set the same way (that is, moved to

the “511” position for this step and to the “511/E” position for the next

step).

2. If the BERT test indicates no errors are present, move the “BERT” switch

to the “up” position to activate the “511/E” test with periodic errors. If

this test is working properly, the receiving modem’s Error LED will blink

regularly. A successful 511/E test will confirm that the link is in place, and

that the Multi-Function Line Drivers’ built-in 511 generators and

detectors are working properly.