Chapter 3. Operation
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T1 ESF CSU ACE User Manual
61203025L1-1
Tests are used to control the activation of loopbacks, the initiation
of data test patterns, and self test execution.
1)LOCAL LOOPBK, Submenu of 4)TEST
Four choices are available for setting the local loopback:
NO LOOPBACK
Deactivates the loopback
DTE ON
Activates the DTE loopback
LINE ON
Activates the line loopback
PAYLOAD ON
Activates the payload loopback
Figure 3-21. Local Loopback Test Screen
2)REM LB, Submenu of 4)TEST
Activates the same loopbacks as the LOCAL LOOPBCK but at the
far end. This uses either the inband loop-up code as specified by
AT&T 62411 for line loopback (ATT In-Band LLB), or the FDL as
specified in ANSI T1.403 for line loopback codes. An FDL (formerly
TABS) maintenance message corresponding to AT&T TR54016 can
be used for payload loopback as well:
NO LOOPBACK
Deactivates the loopback.
AT&T INBAND LLB
Activates the line loopback using inband
code.
ANSI FDL LLB
Initiates the transmission of an FDL line
loop-up code toward the far end.
AT&T FDL PLB
Initiates the transmission of the PLB
maintenance messages on the FDL.
Summary of Contents for Cable T1 ESF CSU ACE
Page 1: ...T1 ESF CSU ACE User Manual Part Number 1203025L1 61203025L1 1C May 2001 ...
Page 16: ...Table of Contents xvi T1 ESF CSU ACE User Manual 61203025L1 1 ...
Page 20: ...List of Tables xx T1 ESF CSU ACE User Manual 61203025L1 1 ...
Page 82: ...Appendix D Glossary D 10 T1 ESF CSU ACE User Manual 61203025L1 1 ...
Page 86: ...Index Index 4 T1 ESF CSU ACE User Manual 61203025L1 1 ...