Cisco ONS 15454 SDH Specifications Page 318

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8-14
Cisco ONS 15454 SDH Installation and Operations Guide, R3.3
May 2002
Chapter 8 SDH Performance Monitoring
Enabling Intermediate-Path Performance Monitoring
8.3 Enabling 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). 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.
SDH Software R3.3 allows LTE cards to monitor near-end PM data on individual high-order paths by
enabling IPPM. IPPM occurs only on high-order paths which have IPPM enabled, and TCAs are raised
only for PM parameters on the selected IPPM paths.
The ONS 15454 SDH performs IPPM by examining the overhead in the monitored path and by reading
all of the near-end path PMs in the incoming direction of transmission. The IPPM process allows the
path signal to pass bidirectionally through the node completely unaltered.
For detailed information about specific PMs, locate the card name in the following sections and review
the appropriate definition.
Procedure: Enable Intermediate-Path Performance Monitoring
Step 1 Open the LTE card of choice. Double-click the cards graphic in the main (node) view or right-click the
card and select Open Card. (Clicking a card once highlights the card only.) See Table 8-3 for a list of
Cisco ONS 15454 SDH LTE cards.
Step 2 Select the Provisioning > VC4 tabs.
Purpose Enable intermediate-path performance monitoring to monitor
high-order paths that are configured in pass-through mode on an ONS
15454 SDH operating in SDH AU4 mode.
Prerequisite Procedures If no VC4 circuit exists, perform VC4 Circuit Creation. For information
about circuit creation, see Chapter 6, Circuits and Tunnels.
The circuit must pass through an STM-N card before you can enable
IPPM on the circuit.
Onsite/Remote Onsite or remote
Table 8-3 Traffic Cards that Terminate the Line, Called LTEs
Line Terminating Equipment
OC3 IR 4/STM1 SH 1310 OC12 IR/STM4 SH 1310
OC12 LR/STM4 LH 1310 OC12 LR/STM4 LH 1550
OC48 IR/STM16 SH AS 1310 OC48 LR/STM16 LH AS 1550
OC48 ELR/STM16 EH 100 GHz OC192 LR/STM64 LH 1550
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