Chapter 5. Testing
Loopback Remote
This test causes the ISU 2x64 to issue a V.54 inband loopback command to a far-end unit. External test equipment must be used to generate/check test patterns. To use this feature, both units must be configured for Clear Channel operation and the far- end unit must be able to respond to V.54 loopback commands. See Setting Protocol Options on page 55 to configure the unit for Clear Channel operation. Press Cancel to end the test.
Test Remote
This test causes the ISU 2x64 to issue a V.54 inband loopback com- mand to a far-end unit and BERT test the link using a built-in pattern generator/checker. This allows a circuit to be tested without any extra test equipment. To use this feature, both units must be config- ured for Clear Channel operation and the far-end unit must be able to respond to V.54 loopback commands. See the section Setting Pro- tocol Options to configure the unit for Clear Channel operation. The built-in 2047 pattern generator/checker displays the number of bytes transmitted on the top line and the number of errored bytes received on the lower line of the front panel display. Pressing 0 will clear the counts. Pressing the Cancel key ends the test. Pressing the down arrow will loop down the remote unit, allowing a test to a loopback plug. Pressing 2 will insert errors.
Loopback Disable
The following options are available in Loopback Disable.
No Rem Lpbks: The ISU 2x64 ignores all V.54 and DDS loopback commands.
DDS Accepted: The ISU 2x64 responds to DDS latching loopback commands. This option only takes effect if the unit is in Leased Line mode.
V.54 Accepted: The ISU responds to V.54 loopback commands.
DDS+V54 Accept: The ISU 2x64 responds to both DDS latching loopback commands (Leased Line mode only) and V.54 loopback commands.
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