Chapter 5. Testing
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ISU 2x64 Dual Port ISDN Service Unit User Manual
25
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.
Содержание ISU 2x64
Страница 14: ...List of Tables viii ISU 2x64 Dual Port ISDN Service Unit User Manual 61200051L1 1D...
Страница 44: ...Chapter 6 Cofiguration 30 ISU 2x64 Dual Port ISDN Service Unit User Manual...
Страница 86: ...Chapter 8 Quick Setup 72 ISU 2x64 Dual Port ISDN Service Unit User Manual 61200051L1 1D...
Страница 90: ...Chapter 9 Security and Remote Configuration 76 ISU 2x64 Dual Port ISDN Service Unit User Manual 61200051L1 1D...
Страница 102: ...Chapter 11 Specifications 88 ISU 2x64 Dual Port ISDN Service Unit User Manual 61200051L1 1D...
Страница 108: ...Appendix A AT Commands 94 ISU 2x64 Dual Port ISDN Service Unit User Manual 61200051L1 1D...
Страница 132: ...Appendix D S Register List 118 ISU 2x64 Dual Port ISDN Service Unit User Manual 61200051L1 1D...
Страница 138: ...Appendix E Connector Pinouts 124 ISU 2x64 Dual Port ISDN Service Unit User Manual 61200051L1 1D...
Страница 148: ...Appendix F Ordering ISDN Without IOCs 134 ISU 2x64 Dual Port ISDN Service Unit User Manual 61200051L1 1D...
Страница 158: ...Glossary 144 ISU 2x64 Dual Port ISDN Service Unit User Manual 61200051L1 1D...
Страница 164: ...Index 150 ISU 2x64 Dual Port ISDN Service Unit User Manual 61200051L1 1D...