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Cisco ONS 15454 Troubleshooting Guide, R8.5
November 2009
Chapter 1 General Troubleshooting
1.11.3 Circuit Creation Error with VT1.5 Circuit
1.11.3 Circuit Creation Error with VT1.5 Circuit
Symptom You receive an “Error while finishing circuit creation. Unable to provision circuit. Unable to
create connection object at node_name” message when trying to create a VT1.5 circuit in CTC.
Possible Cause You might have run out of bandwidth on the VT cross-connect matrix at the
ONS 15454 indicated in the error message.
Recommended Action The matrix has a maximum capacity of 336 bidirectional VT1.5
cross-connects. Certain configurations exhaust VT capacity with less than 336 bidirectional VT1.5s
in a BLSR or less than 224 bidirectional VT1.5s in a path protection or 1+1 protection group. Refer
to the “Circuits and Tunnels” chapter in the Cisco ONS 15454 Reference Manual for more
information.
1.11.4 Unable to Create Circuit From DS-3 Card to DS3XM-6 or DS3XM-12 Card
Symptom You cannot create a circuit from a DS-3 card to a DS3XM-6 or DS3XM-12 card.
Possible Cause A DS-3 card and a DS3XM-6 or DS3XM-12 card have different functions.
Recommended Action A DS3XM-6 card converts each of its six DS-3 interfaces into 28 DS-1s for
cross-connection through the network. The DS3XM-12 converts each of its 12 interfaces into up to
48 DS-1s. Thus, you can create a circuit from a DS3XM-6 or DS3XM-12 card to a DS-1 card, but
not from a DS3XM card to a DS-3 card. These differences are evident in the STS path overhead. The
DS-3 card uses asynchronous mapping for DS-3, which is indicated by the C2 byte in the STS path
overhead that has a hex code of 04. A DS3XM-6 or DS3XM-12 has a VT payload with a C2 hex
value of 02.
Note You can find instructions for creating circuits in the “Create Circuits and VT Tunnels” chapter
of the Cisco ONS 15454 Procedure Guide.
1.11.5 DS-3 Card Does Not Report AIS-P From External Equipment
Symptom A DS3-12, DS3N-12, DS3-12E, or DS3N-12E card does not report STS AIS-P from the
external equipment/line side.
Possible Cause The card is functioning as designed.
Recommended Action This card terminates the port signal at the backplane so STS AIS-P is not
reported from the external equipment/line side. DS3-12, DS3N-12, DS3-12E, and DS3N-12E cards
have DS3 header monitoring functionality, which allows you to view PM on the DS3 path.
Nevertheless, you cannot view AIS-P on the STS path. For more information about the PM
capabilities of the DS3-12, DS3N-12, DS3-12E or DS3N-12E cards, refer to the “Performance
Monitoring” chapter in the Cisco ONS 15454 Reference Manual.
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