Trouble Notifications; Conditions - Cisco ONS 15327 User Documentation

Trouble Notifications

Table 14-3 Alarm Type/Object Definition (continued)
NE-SREF
OCN
RING
STSMON
STSTRM
VT-MON
VT-TERM
1. Digital Signal 1
2. Digital Signal 3
3. Synchronous Transport Signal
4. Virtual Tunnel
5. Bidirectional Line Switched Ring
14.3 Trouble Notifications
The ONS 15327 uses standard Telcordia categories to characterize levels of trouble. The ONS 15327
reports both alarmed trouble notifications, under the Alarms tab, and nonalarmed (NA) trouble
notifications under the Conditions tab in CTC. Alarms signify a problem that the user needs to fix, such
as a loss of signal (LOS). Conditions notify the user of an event which does not require action, such as
a switch to a secondary timing reference (SWTOSEC) or a user-initiated manual reset (MANRESET).
Telcordia further divides alarms into Service-Affecting (SA) and Non-Service-Affecting (NSA) status.
An
missing transmitter (TRMT-MISS) alarm is characterized as an SA failure. TRMT-MISS occurs when
the cable connector leading to a port on an active XTC card is removed. This affects a provided service,
because traffic switches to the protect card. The high temperature (HITEMP) alarm, which means the
ONS 15327 is hotter than 122 degrees Fahrenheit (50 degrees Celsius), is also an SA failure. Although
for example a particular XTC port may not be affected, a high temperature affects the network ability to
provide service.

14.3.1 Conditions

When an SA failure is detected, the ONS 15327 also sends an AIS downstream. When it receives the
AIS, the receiving node sends a remote failure indication (RFI) upstream. AIS and RFI belong in the
conditions category and show up on the Conditions window of the ONS 15327. However, unlike most
conditions that are nonalarmed, 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 under TL1 and under the History tab of CTC. For a comprehensive list
of all conditions, refer to the Cisco ONS 15454 and Cisco ONS 15327 TL1 Command Guide.
Cisco ONS 15327 User Documentation, R3.3
14-8
Represents the timing status of the NE.
OC-N line on an OC-N card.
5
BLSR number (STSRNG).
STS alarm detection at the monitor point (upstream of cross-connect).
STS alarm detection at termination (downstream of cross-connect).
VT1 alarm detection at the monitor point (upstream of cross-connect).
VT1 alarm detection at termination (downstream of cross-connect).
SA failure affects a provided service or the network ability to provide service. For example, a
Chapter 14 Alarm Troubleshooting
June 2002