Chapter 6. Diagnostics
61200290L1-1
MX2800 User Manual
6-5
CSU Loopback
A
CSU L
OOPBACK
enables the MX2800 to generate a CSU loop-up
pattern (001001…) towards the T1 CSU attached to the selected T1
line for six seconds. After six seconds have elapsed, the pattern will
cease and incoming network traffic will be passed through to the
CSU device. If the CSU device responded to the CSU loop-up
pattern, it will return all data back towards the network. A loop-
down pattern (0000100001….) will be generated towards the CSU
for six seconds when
D
ATA
M
ODE
is selected.
CSU Loopback w/BERT
A
CSU L
OOPBACK
w/BERT enables the MX2800 to test the local T1
loop to the CSU using the standard 511 pseudo-random bit
sequence. When
CSU L
OOPBACK
W
/B
ERT
is selected, the MX2800
will initiate a CSU loopback towards the CSU attached to the
selected T1 line similar to the
CSU L
OOPBACK
test above. Six
seconds after starting the CSU loop-up pattern, the MX2800 will
cease sending the CSU loop-up pattern and begin sending an
unframed 511 pattern towards the CSU. If the CSU device
responded to the CSU loop-up pattern, the MX2800 will check the
incoming pattern for errors. Additional menu items will appear to
show the state of pattern synchronization, error count, and a clear
error count option (see Figure 6-7). Selecting
D
ATA
M
ODE
will cease
the transmission of the 511 pattern and start transmission of a loop-
down pattern as previously described.
When in CSU LOOPBACK, only the DATA MODE for the T1 under
test may be selected. Selecting any other option will result in an error
message being displayed.
When in CSU LOOPBACK w/BERT, only the DATA MODE for the
T1 under test may be selected. Selecting any other option will result in an
error message being displayed.
Summary of Contents for TOTAL ACCESS MX2800
Page 8: ...viii MX2800 User Manual 61200290L1 1...
Page 16: ...List of Tables xvi MX2800 User Manual 61200290L1 1...
Page 100: ...Chapter 7 Circuit and Network Redundancy 7 6 MX2800 User Manual 61200290L1 1...
Page 106: ...Chapter 8 Power Loss Recovery 8 6 MX2800 User Manual 61200290L1 1...
Page 110: ...Appendix A Pinouts A 4 MX2800 User Manual 61200290L1 1...
Page 114: ...Appendix B Specifications Summary B 4 MX2800 User Manual 61200290L1 1...
Page 130: ...Appendix D Glossary D 12 MX2800 User Manual 61200290L1 1...
Page 140: ...Index Index 10 MX2800 User Manual 61200290L1 1...
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