Intermediate-Path Performance Monitoring - Cisco ONS 15454 SDH User Manual

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 Line Terminating Equipment (LTE)
Electrical LTE
STM1E-12
Optical LTE
OC3 IR 4/STM1 SH 1310
OC12 IR/STM4 SH1310
OC12 LR/STM4 LH 1550
OC48 IR/STM16 SH AS 1310
OC48 ELR/STM16 EH 100 GHz
OC192 IR/STM64 SH 1550
OC192 LR/STM64 LH ITU 15xx.xx
MXP_2.5G_10G
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.
The E1 card and STM-1 card can monitor far-end IPPM. For all other cards listed in
Note
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.
Cisco ONS 15454 SDH Reference Manual, R4.6
15-2
Table 15-1 shows ONS 15454 SDH cards that are considered LTE.
Chapter 15
—
OC3 IR/STM1 SH 1310-8
OC12 LR/STM4 LH1310
OC12 IR/STM4 SH 1310-4
OC48 LR/STM16 LH AS 1550
OC192 SR/STM64 IO 1310
OC192 LR/STM64 LH 1550
TXP_MR_10G
—
Performance Monitoring
Table 15-1, far-end
April 2008