Table 4-1
Incoming signal failure conditions
(continued)
Incoming Signals
Monitored/Detected Failures
STS-1
STS-3c
inc. STSN AIS
inc. STSN LOP
inc. STSN RFI-P
inc. STSN sig. degrade (BER)
inc. STSN sig. failed (BER)
inc. STSN unequipped
VT1.5
inc. VT AIS
inc. VT LOP
inc. VT RFI-V
inc. VT sig. degrade (BER)
inc. VT unequipped
Notes:
1.
The BER thresholds for DS1 are based on bipolar 8-zero substitution
(B8ZS) or alternate mark inversion (AMI) violations depending on line
coding.
2.
The BER thresholds for DS3 are based on bipolar 3-zero substitution
(B3ZS) coding violations.
Fault isolation
When a failure is detected, Metropolis
®
DMXplore employs
automatic diagnostics to isolate the failed circuit pack or signal. Most
failures are isolated to an incoming signal failure (inc. sig. failed) or
to a single circuit pack, but some failures may be isolated to more
than one circuit pack. Failures are reported to the local technician and
operations systems so that repair decisions can be made. If desired,
operations system personnel and the local technician can use the
WaveStar
®
CIT to gain more detailed information on the trouble
condition.
Fault reporting
All failures detected and isolated by Metropolis
®
DMXplore are
stored and made available to be reported, on demand, through the
WaveStar
®
CIT. In addition, a history of the past 500 notifications is
maintained and available for on-demand reporting. Each alarm
notification is date and time stamped.
Alarm and status conditions reporting
Maintenance overview
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4 - 8
Lucent Technologies
365-372-333 R2.1
Issue 4, June 2005