Table of Contents
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Table 2-3 lists the alarms the OC3port Plus can detect and their meanings.
Table 2-3. SONET Alarms Detected by the OC3port Plus on the Status LEDs
SONET Status LED
SECTION LOS
(Loss of Signal)
SECTION LOF
(Loss of Frame)
SECTION OOF
(Out of Frame)
LINE FERF
(Far End Receive Failure)
LINE AIS
(Line Alarm Indication Signal)
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OC3port Plus Controls and Connections
Description
Lights when an incoming optical OC3 signal cannot be
detected.
Declared when a Section OOF condition persists for
three milliseconds.
This three-millisecond timer does not reset until an in-
frame condition also persists for three milliseconds,
prohibiting oscillations and the declaration of an LOF
in the presence of intermittent OOF conditions.
Declared when four consecutive STS-3c frames
containing one or more framing pattern errors are
received.
A Section OOF alarm is removed when two sequential
frames with correct framing patterns are detected (an
in-frame condition).
Detects the presence of a Line FERF in the received
STS-3c stream.
Declared when a "110" pattern is detected in bits 6, 7
and 8 of the K2 framing byte for five consecutive
frames.
A LINE FERF alarm is removed when a pattern other
than "110" is detected for five consecutive frames.
Detects the presence of a Line FERF in the received
STS-3c stream.
Declared when a "111" pattern is detected in bits 6, 7
and 8 of the K2 framing byte for five consecutive
frames.
A Line AIS alarm is removed when a pattern other
than "111" is detected for five consecutive frames.
Getting Started
2
2-9
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