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Cisco Signaling Gateway Manager User Guide
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Chapter3 Managing ITP Networks Using SGM
Working with Links
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Incorrect NI (Network Indicator)—A signaling link test message was
received with an incorrect NI. This can occur when links are connected
to the correct linkset and link, but the NIs of the two adjacent point codes
are not the same.
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Bad Pattern—A signaling link test message was received with an
incorrect test pattern. This error occurs because the test pattern is corrupt.
This usually indicates a hardware or configuration issue related to the
physical format of the data on the links, caused by a variant mismatch or
incorrect definitions on the physical link.
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Non Adjacent—Received a signaling link test message from a
non-adjacent node.
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Failed—Unable to run the test, or no response was received within the
specified interval.
•Link Fail Reason—If the link failed the link test, indicates the reason for the
failure. Possible reasons are:
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None—No additional reason available.
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Changeover in progress—Changeover is in progress. This message is
used to divert traffic away from a failed link.
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Management disconnect request—An MTP3 sent a request to stop the
link.
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Link alignment lost—Link alignment is lost.
A link is in alignment when signal units are received in sequence, and
with the proper number of octets. The signal unit must be a total length
of eight-bit multiples. If the signal unit is not of eight-bit multiples, or if
the signaling information field (SIF) exceeds the 272-octet capacity, the
signaling unit is considered to be in error. If excessive errors are
encountered on a link, it is considered to be out of alignment.
For M2PA links, this state reason is generated when the M2PA alignment
timer T1 expires. This could indicate that the remote link is shutdown, or
that there are intermittent IP connectivity problems.
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Link connection lost—Link connection is lost.
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Local Disconnect—A request to disconnect the link has been received,
but the link is already disconnected.
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Remote Disconnect—A remote disconnect request has been received.