Chapter 1. Introduction
1-10
T1 ESF CSU ACE User Manual
61203025L1-1
DTE Interface Loopbacks
Loops all data from the terminal interface (T1) back towards the T1.
This loopback may be initiated using front panel, EIA-232 control
port, or T-Watch commands. The DTE (or external test equipment)
must provide any test pattern in order to check the DTE interface.
See Figure 1-5.
Figure 1-5. DTE Interface Loopback
Pattern Generation
The T1 ESF CSU ACE offers three test patterns: All Ones, All Zeros,
and 1:8. These patterns can be initiated from the front panel,
through the EIA-232 control port, or remotely via a management
software like T-Watch.
All Ones
The All Ones pattern sends ones in all the payload bits.
All Zeroes
The All Zeros pattern sends zeros in all the payload bits and is
useful for testing line code configuration (AMI/B8ZS mismatches).
1 in 8 (1:8)
Each channel of the T1 has only one bit set. This pattern is used in
conjunction with external test equipment to determine whether the
T1 line is performing acceptably under a stress condition.
Summary of Contents for Cable T1 ESF CSU ACE
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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 ...