Ring-Mismatch; Sd-L - Cisco ONS 15327 User Documentation

Alarm Procedures

14.4.103 RING-MISMATCH

•
A procedural error mismatch ring (RING-MISMATCH) alarm occurs when the ring ID of the ONS
15327 that is reporting the alarm does not match the ring ID of another ONS node in the BLSR. ONS
nodes connected in a BLSR must have identical ring IDs to function.
Procedure: Clear the RING-MISMATCH Alarm
Click the Provisioning > Ring tabs.
Step 1
Note the number in the Ring ID field.
Step 2
Step 3 Login to the next ONS node in the BLSR.
Verify that the ring ID number matches the ring ID number of the reporting node:
Step 4
a.
b.
c.
d.
e.
Repeat Step 4 for all ONS nodes in the BLSR.
Step 5

14.4.104 SD-L

•
A signal degrade (SDFL) alarm occurs when the quality of the signal is so poor that the bit error rate
(BER) on the incoming optical line passed the SD threshold. Signal degrade is defined by Telcordia as
a "soft failure" condition. SD and SF both monitor the incoming BER and are similar alarms, but SD is
triggered at a lower bit error rate than SF. The BER threshold on the ONS 15327 is user provisionable
and has a range for SD from 10
at the line (facility) level. A line or facility level SD alarm travels on the B2 byte of the SONET overhead.
The SD alarm clears when the BER level falls to one-tenth of the threshold level that triggered the alarm.
A BER increase is sometimes caused by a physical fiber problem, including a poor fiber connection, a
bend in the fiber that exceeds the permitted bend radius, or a bad fiber splice.
Invisible laser radiation may be emitted from the aperture ports of the single-mode, fiber-optic
Warning
modules when no cable is connected. Avoid exposure and do not stare into open apertures.
Always use the supplied ESD wristband when working with a powered ONS 15327. Plug the wristband
Caution
cable into the ESD jack located on the lower-right outside edge of the shelf assembly.
Cisco ONS 15327 User Documentation, R3.3
14-72
Major, Service-Affecting
If the ring ID matches the ring ID in the reporting ONS node, login to the next ONS node in the
BLSR.
If the ring ID does not match the ring ID in the reporting ONS node, change the ring ID to match
the ring ID of the reporting node and click Apply.
Click Yes on the Accept Ring Map Changes dialog box.
Verify that the ring map is correct.
Click Accept for the new BLSR ring map.
Not Alarmed (NA) (Condition)
-9 -5
to 10 . SD-L causes a switch from the working card to the protect card
Chapter 14 Alarm Troubleshooting
June 2002