Chapter 6. Diagnostics
61200659L1-1
MX2800 STS-1 User Manual
6-5
CSU Loopback
A
CSU L
OOPBACK
enables the MX2800 STS-1 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 STS-1 to test the
local T1 loop to the CSU using the standard QRSS pseudo-random
bit sequence. When
CSU L
OOPBACK
W
/BERT
is selected, the
MX2800 STS-1 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 STS-1 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 STS-1 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 on page 6-6). Selecting
D
ATA
M
ODE
will cease the
transmission of the QRSS pattern and start transmission of a loop-
down pattern as previously described.
When in
CSU L
OOPBACK
, only the
D
ATA
M
ODE
for the T1 under test
may be selected. Selecting any other option will result in an error
message being displayed.
Summary of Contents for 1200287L1
Page 10: ...x MX2800 STS 1 User Manual 61200659L1 1...
Page 18: ...Table of Contents xviii MX2800 STS 1 User Manual 61200659L1 1...
Page 22: ...List of Tables xxii MX2800 STS 1 User Manual 61200659L1 1...
Page 90: ...Chapter 3 Configuration 3 44 MX2800 STS 1 User Manual 61200659L1 1...
Page 134: ...Chapter 6 Diagnostics 6 12 MX2800 STS 1 User Manual 61200659L1 1...
Page 140: ...Chapter 7 Circuit and Network Redundancy 7 6 MX2800 STS 1 User Manual 61200659L1 1...
Page 146: ...Chapter 8 Power Loss Recovery 8 6 MX2800 STS 1 User Manual 61200659L1 1...
Page 160: ...Chapter 9 Transaction Language 1 TL1 9 14 MX2800 STS 1 User Manual 61200659L1 1...
Page 164: ...Appendix A Pinouts A 4 MX2800 STS 1 User Manual 61200659L1 1...
Page 168: ...Appendix B Specifications Summary B 4 MX2800 STS 1 User Manual 61200659L1 1...
Page 174: ...Appendix C Acronyms Abbreviations C 6 MX2800 STS 1 User Manual 61200659L1 1...