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15-2
Cisco ONS 15454 SDH Reference Manual, R4.6
April 2008
Chapter 15 Performance Monitoring
15.2 Intermediate-Path Performance Monitoring
During the accumulation cycle, if the current value of a performance monitoring parameter reaches or
exceeds its corresponding threshold value, a threshold crossing alert (TCA) is generated by the node and
displayed by CTC. TCAs provide early detection of performance degradation. When a threshold is
crossed, the node continues to count the errors during a given accumulation period. If 0 is entered as the
threshold value, the performance monitoring parameter is disabled.
Change the threshold if the default value does not satisfy your error monitoring needs. For example,
customers with a critical E1 installed for 911 calls must guarantee the best quality of service on the line;
therefore, they lower all thresholds so that the slightest error raises a TCA.
15.2 Intermediate-Path Performance Monitoring
Intermediate-path performance monitoring (IPPM) allows transparent monitoring of a constituent
channel of an incoming transmission signal by a node that does not terminate that channel. Many large
ONS 15454 SDH networks only use line terminating equipment (LTE), not path terminating equipment
(PTE). Table 15-1 shows ONS 15454 SDH cards that are considered LTE.
Software Release 3.0 (R3.0) and later allows LTE cards to monitor near-end PM data on individual
high-order paths by enabling IPPM. After enabling IPPM provisioning on the line card, service providers
can monitor high-order paths that are configured in pass-through mode on an ONS 15454 SDH operating
in SDH AU4 mode, thus making troubleshooting and maintenance activities more efficient.
IPPM occurs only on high-order paths that have IPPM enabled, and TCAs are raised only for PM
parameters on the IPPM enabled paths. The monitored IPPM parameters are HP-EB, HP-BBE, HP-ES,
HP-SES, HP-UAS, HP-ESR, HP-SESR, and HP-BBER.
Note The E1 card and STM-1 card can monitor far-end IPPM. For all other cards listed in Table 15-1, far-end
IPPM is not supported. However, SDH path PM parameters can be monitored by logging into the far-end
node directly.
The ONS 15454 SDH performs IPPM by examining the overhead in the monitored path and by reading
all of the near-end path PM values in the incoming direction of transmission. The IPPM process allows
the path signal to pass bidirectionally through the node completely unaltered.
Table 15-1 Line Terminating Equipment (LTE)
Electrical LTE
STM1E-12 —
Optical LTE
OC3 IR 4/STM1 SH 1310 OC3 IR/STM1 SH 1310-8
OC12 IR/STM4 SH1310 OC12 LR/STM4 LH1310
OC12 LR/STM4 LH 1550 OC12 IR/STM4 SH 1310-4
OC48 IR/STM16 SH AS 1310 OC48 LR/STM16 LH AS 1550
OC48 ELR/STM16 EH 100 GHz OC192 SR/STM64 IO 1310
OC192 IR/STM64 SH 1550 OC192 LR/STM64 LH 1550
OC192 LR/STM64 LH ITU 15xx.xx TXP_MR_10G
MXP_2.5G_10G —