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Cisco ONS 15327 Troubleshooting Guide, R3.4
March 2004
Chapter 2 Alarm Troubleshooting
Trouble Notifications
2.4 Trouble Notifications
The ONS 15327 uses standard Telcordia categories to characterize levels of trouble. The ONS 15327
reports alarmed trouble notifications in the CTC Alarms window and Not Alarmed (NA) trouble
notifications in the Conditions window. Alarms signify a problem that the user needs to fix, such as an
LOS (OC-N) alarm (see page 2-84). Conditions notify the user of an event which does not require action,
such as a SWTOSEC condition (see page 2-115) or a MANRESET condition (see page 2-88).
Telcordia further divides alarms into Service-Affecting (SA) and NSA status.
An SA failure affects a
provided service or the network’s ability to provide service. For example, a TRMT-MISS alarm (see page
2-121) is characterized as an SA failure. TRMT-MISS occurs when the cable connector leading to a DS-1
port on an XTC card is removed. This affects a provided service because traffic switches to the protect
card. The HITEMP alarm (see page 2-72) means that the alarm object is hotter than 122 degrees
Fahrenheit (50 degrees Celsius). HITEMP is an NSA failure for a single piece of equipment, or an SA
failure for the NE. For example, if the HITEMP alarm is raised against a port with an EQPT object, the
alarm is NSA because port and card traffic is protected. If the HITEMP alarm is raised against the NE
(shelf), however, it is an SA alarm because a high temperature affects the network’s ability to provide
service.
2.4.1 Conditions
When an SA failure is detected, the ONS 15327 also sends an AIS condition (see page 2-16)
downstream. When the node receives the AIS, the node sends an RFI-L condition (see page 2-101)
upstream. AIS and RFI belong in the conditions category and show in the Conditions window of CTC.
However, unlike most conditions which are Not Alarmed (NA), Telcordia classifies these conditions as
Not Reported (NR).
Both CTC and TL1 report NRs and NAs as conditions when conditions are retrieved. NAs are also
reported as autonomous events in TL1 and in the History window of CTC. For a comprehensive list of
all conditions, refer to the Cisco ONS 15454 and Cisco ONS 15327 TL1 Command Guide.
2.4.2 Severities
The ONS 15327 uses Telcordia standard severities: Critical (CR), Major (MJ), and Minor (MN). Critical
indicates a severe, service-affecting alarm that needs immediate correction. Major is a serious alarm, but
the failure has less of an impact on the network. For example, with an LOS (DS-1), a Major alarm, 24
DS-0 circuits lose protection. But with a LOS (OC-N) for an OC-48 card, a Critical alarm, approximately
25,000 DS-0 circuits lose protection.
NERING Represents the ring status in the NE
NE-SYNCH Represents the timing status of the NE
OCN An OC-N line on an OCN card
STSMON STS alarm detection at the monitor point (upstream from the cross-connect)
STSTERM STS alarm detection at termination (downstream from the cross-connect)
VT-MON VT1 alarm detection at the monitor point (upstream from the cross-connect)
VT-TERM VT1 alarm detection at termination (downstream from the cross-connect)
Table 2-7 Alarm Type/Object Definition (continued)