363-206-285
Maintenance Description
Issue 3 June 2001
9-43
Figure 9-20. DDM-2000 OC-3 Multiplexer DS1 Path Performance Monitoring
From these messages, the DDM-2000 OC-3 Multiplexer can determine and report
the end-to-end error performance of the entire DS1 link
as seen by the customer
.
These parameters, listed in Table 9-5, are thresholded and reported to indicate
degraded performance. The counts are retrieved using the rtrv-pm-t1
command to determine if the service is operating within tariffed limits.
Application of the OC-3 DS1 PM feature for tariffed service verification is shown in
Figure 9-20. Figure 9-20 shows an
ANSI
T1.403 ESF format DS1 service carried
between points A and Z, using a DDM-2000 OC-3 system and terminated at the
customer's premises with channel service units (CSUs). At the "A" end, the
received error performance (Z-A) is detected and written by the customer's CSU
onto the outgoing (A-Z) ESF data link, as shown by the dashed lines, as a
performance report message (PRM). The DS1PM circuit pack interfacing the “A”
end reads the incoming DS1 signal's PRM (received from the customer's
premises) and reports the Z-A performance. Likewise, the OC-3 system
interfacing the Z end reports the A-Z performance by reading the PRM from the
customer's "Z" CSU. By reviewing the data from each OC-3 system, the service
provider can determine the complete end-to-end performance (A-Z and Z-A) of
the customer's service.
DS1 PATH
PERFORMANCE
MONITOR
Z-A
Performance
Report
A-B
Performance
Report
DDM-2000
M
POINT B
POINT A
CSU
POINT C
Network
OC-3
Legend:
CSU - Channel Service Unit
PRM - Performance Report Message
Z-A
PRM
DSX-1
DDM-2000
M
DSX-1
DS1 PATH
MONITOR
PERFORMANCE
A-Z
Performance
Report
Z-C
Performance
Report
POINT Z
CSU
A-Z
PRM
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