Chapter3 Managing ITP Networks Using SGM
Working with Links
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Cisco Signaling Gateway Manager User Guide
78-15589-01
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Signal unit error rate monitor failure—The signal unit error rate
monitor has failed.
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T1 timeout no FISU received—A T1 timeout no FISU has been
received. This timer avoids message mis-sequencing during changeover.
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T2 timeout no SIO received—A T2 timeout no SIO has been received.
This timer waits for a changeover acknowledgment.
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T3 timeout no SIN received—A T3 timeout no SIN has been received.
This timer controls diversion-delay to avoid mis-sequencing on
changeback.
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T6 timeout excessive congestion—A T6 timeout excessive congestion
has been received. This timer avoids message mis-sequencing on
controlled rerouting.
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T7 timeout excessive acknowledgement delay—A T7 timeout
excessive acknowledgment delay has been received. The T7 timer
prevents a signaling point from waiting too long for a positive or negative
acknowledgment. Usually, an acknowledgment is sent when a signaling
point becomes idle and does not have any more traffic to transmit. When
congestion occurs at a signaling point, or an extreme amount of traffic is
present, it is possible that T7 could time out and force retransmission of
messages.
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Link proving failure—A link proving failure occurred.
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Abnormal BSN received—An abnormal Backward Sequence Number
(BSN) has been received.
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Abnormal FIB received—An abnormal Forward Indicator Bit (FIB) has
been received.
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Abnormal SIB received—An abnormal Status Indicator Busy (SIB) has
been received.
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Abnormal LSSU received—An abnormal Link Status Signal Unit
(LSSU) has been received.
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Peer not ready—An MTP3 tried to bring up a link that is still cleaning
up after being stopped. In some cases, the MTP3 does not changeover
after a link failure, so the M2PA/SCTP waits for an event that will not
occur. When an MTP3 tries to bring up the link again, the previous
control structures have to be cleaned up first. If M2PA gets a start request
from an MTP3, and the previous structures are still being held, M2PA