Notes On Data Calls - Agilent Technologies aurora Duet User Manual

Duet
aurora Basic & Primary Rate ISDN Tester - User Guide

Notes on data calls

6 - 2
between the two channels, connect the CODEC and
listen to whichever call you want to.
It is possible, however, to make or receive a voice call at
the same time as a data call is in progress. This is a
valuable test which can be performed to detect any cross-
channel interference which may be present.
Quality is tested by running a Bit Error Rate Test (BERT)
in the data connection established by a call. This test
transmits a selected known pattern of data at 56 or
64kbps and checks a similar received pattern for bit
errors.
BER testing can be performed in the following ways:
• You can make an end-to-end test call between your
aurora and either another compatible ISDN basic
Duet
or primary rate tester, or a non-compatible data
tester connected to the ISDN through a terminal
adaptor.
• You can make a loopback test call to another
channel of the same aurora
the other channel loops the received data back to
line, so that it arrives back at the receiver of the
originating channel. In this way you can perform a
full duplex BER test of both channels
simultaneously.
Duet . In this configuration,
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