Specifications

8-10
Cisco ONS 15454 Installation and Operations Guide, R3.2
March 2002
Chapter 8 Performance Monitoring
Enabling Intermediate-Path Performance Monitoring
Change the threshold if the default value does not satisfy your error monitoring needs. For example,
customers with a critical DS1 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.
Note A PM parameter is disabled if 0 or a number exceeding the threshold range is entered as the threshold
value.
Note Under the Provisioning > Threshold tabs, the DS1 and DS1N cards have user-defined thresholds for
the DS1 receive (Rx) path PMs. In the Threshold tab they are displayed as CV, ES, SES, UAS, AISS,
and SAS without the Rx prefix. No threshold settings are associated with the DS1 transmit (Tx) path
PMs. Displayed in the Performance tab are the PM counts received for the DS1 Rx path PMs. The
displayed DS1 Tx path PM values are based on calculations performed by the card and therefore have
no TCAs that require provisioning.
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 networks only use line terminating equipment (LTE) and not path terminating equipment
(PTE). After enabling IPPM provisioning on the line card, service providers can monitor large amounts
of STS traffic through intermediate nodes, thus making troubleshooting and maintenance activities more
efficient.
Software R3.0 and higher allows LTE cards to monitor near-end PM data on individual STS payloads
by enabling IPPM. IPPM occurs only on STS paths which have IPPM enabled, and TCAs are raised only
for PM parameters on the selected IPPM paths.
The ONS 15454 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
Before you begin, verify that the affected card(s) has an STS circuit. The circuit must pass through the
EC-1 or OC-N card before you can enable IPPM on the circuit. The monitored IPPMs are STS CV-P,
STS ES-P, STS SES-P, STS UAS-P, and STS FC-P.
Step 1 Open the LTE card of choice. Double-click the card’s 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 LTE cards.