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26 — System diagnostics
2902 MainStreet Technical Practices 26-3
May 2002 90-2906-01
While test 4 is applied to a Codirectional DCM circuit, 8 kHz timing is turned on and
all ones is turned off. Even if the Codirectional DCM circuit has been configured not
to generate 8 kHz timing (see section 20.5 in
Configuration
), it does generate 8 kHz
timing during the test. Even if the Codirectional DCM circuit has been configured to
generate all ones (see section 20.6 in
Configuration
), it does not generate all ones
during the test.
Selecting MAINT — UNDO_MAINT does not disable background diagnostics, halt
directed diagnostics, affect the state of the signaling leads (SET_SIGNAL) or
remove a primary rate link loopback.
26.2 Background diagnostics
System and circuit background diagnostics can be performed by the 2902 MainStreet
system.
System background diagnostics
When system background diagnostics are enabled, the system tracks any fault that
occurs. The system cycles continuously through the four diagnostics tests (as listed
in Table 26-1). If testing is disabled and re-enabled, it resumes where it stopped.
System background diagnostics are disabled by default and can be restarted from
test 1.
Circuit background diagnostics
Circuit background diagnostics can be enabled or disabled for individual circuits.
Background diagnostics for individual circuits are disabled by default.
Procedure 26-1 To set system background diagnostics
* Default
The RESTART softkey only appears when background diagnostics are enabled.
Note 1 —
Maintenance on the module in physical position 2 is
accessed through NMTI logical module position M9.
Note 2 —
Maintenance information on logical module position M9 is
not available when position M9 is disabled by logical position M1
(during a super-rate connection). See section 19.11 in
Configuration
for details.
RESTART ENABLE/DISABLE*
MAINT — DIAG
SK000535