Error Log Entries and Test to Clear Values

Table 44. DS1 ISDN Trunk Error Log Entries

Error Type	Aux Data	Associated Test	Alarm Level	On/Off Board	Test to Clear Value
0*	0	Any	Any	Any	test port GGGVSpp
1(a)	Any	None			test port GGGVSpp
15(b)	Any	Audit and Update Test (#36)
18	0	busyout trunk grp/mbr			release trunk grp/mbr
19(c)	0	None
129(d)		None	WARNING	OFF	test port GGGVSpp
130(e)		None	WARNING	ON	test port GGGVSpp
257(f)	Any	None			test port GGGVSpp
513(g)	Any	None	WARNING	OFF	test port GGGVSpp
769(h)	Any	None			test port GGGVSpp
1025	0	None
1793(i)	Any	None			test port GGGVSpp
3073(j)	Any	Service State Audit (#256)			test port GGGVSpp
3585(k)	Any	None			none
3841(l)	Any	None	WARNING	OFF	None
*Run the Short Test Sequence first. If all tests pass, run the Long Test Sequence. Refer to the appropriate test description and follow the recommended procedures.
**Major or minor alarms may be downgraded to Warning alarms based on the value used in the set options command.

Notes:

• (a) These Error Types indicate a disagreement between this switch and the switch at the other end of the trunk connection with regard to the ISDN call state of the DS1 ISDN Trunk. This switch will automatically try to recover by clearing the call, (that is, call will be torn down). You can use the status trunk group#/member# command to determine the state of the trunk.

When running the Short Test Sequence of tests, pay close attention to the results of the Call State Audit Test (#257).

• (b) Software audit error and does not indicate a hardware malfunction. Run the Short Test Sequence and investigate associated errors.
• (c) Possible protocol mismatch or far-end may be out-of-service.

Many truck problems are caused by incorrect settings of parameters on the trunk group administration form. Settings must be compatible with the local environment and with parameter settings on the far-end. A DS1 ISDN trunk is a 64 Kbps bearer channel used to transmit digitized voice or data traffic. These trunks, or B-channels, use a separate channel, the D-channel for call-control signaling. This mode of operation is known as out-of-band signaling, as opposed to in-band, robbed-bit signaling, in which signaling is carried in the same channel as the voice or data traffic. One D-channel, or ISDN signaling link (ISDN-LNK), carries signaling messages for several B-channels, forming an ISDN signaling group (ISDN-GRP). A B-channel may be a port on DS1 MM. Two types of DS1 interfaces exist: (1) 24 DS0 channels on a 1.544 Mbps link or (2) 31 DS0 channels + 1 framing channel on a 2.048 Mbps link. For additional maintenance information, see also DS1-MM.

• (d) The far-end switch changed its ISDN service state to either out-of-service or maintenance. This may be a temporary condition due to testing of that trunk by the far-end, or a hardware problem with the trunk. Outgoing calls will not be allowed over the trunk. To investigate the status of the trunk, issue the status trunk group#/member# command.
• (e) This Error Type indicates that the Media Module has been removed or has been insane for more than 11 minutes. To clear the error, reinsert or replace the Media Module.
• (f) These Error Types indicate a disagreement between this switch and the switch at the other end of the trunk connection with regard to the ISDN service state of the DS1 ISDN Trunk. This switch will automatically try to recover by performing a service state audit. You can use the status trunk group#/member# command to determine the state of the trunk.

When running the Short Test Sequence, pay close attention to the results of the Service State Audit Test (#256).

• (g) This trunk is not recognized by the far-end switch. Investigate the trunk administration for both switches and make changes as necessary.
• (h) An unexpected SERVICE or SERVICE ACK was received. Possibilities include:
• Translations conflict
• Protocol differences
• ESS may be using NI3 protocol which is not currently implemented in MultiVantage
• B-channel negotiation problem (glare)
• (i) This error indicates a failure of the DS1/MM-DS1 Interface Media Module. When running the Short Test Sequence, the results of the Signaling Link State Check Test (#255) are important.
• (j) Service State Audit attempt failed (see Test #256). The trunks will not be usable for any outgoing calls (although incoming calls will be accepted) until the test passes and the trunk state is changed to in-service (use status trunk group#/member# to investigate trunk status).
• (k) Error Type 3585 appears when the switch receives an ISDN RESTART message for an ISDN trunk. Calls are cleared with the RESTART message. Therefore, this Error Type may be associated with a dropped call report from a user.

The following Aux Data values for Error Type 3585 represent the trunk's ISDN call state at the time the unexpected request to restart the channel was received from the remote switch. This information can be useful if dropped calls (cutoffs) are reported by users of the ISDN-PRI trunks.

The meanings of Aux Data values are shown below; ignore any others.

• (l) An ISDN trunk selected by the near-end has been rejected 10 times by the far-end without a successful call. This may indicate a service state mismatch between the near-end and far-end for this trunk that is effecting the end user (that is, customer receives unexpected intercept tones when accessing ISDN trunks). This may indicate that the ISDN trunk is not administered on the far-end.

The Aux field contains the physical name of the ISDN trunk in decimal. Then, verify that the far-end has this trunk administered.

The Warning alarm will be retired automatically whenever an outgoing or incoming call that uses this trunk is answered by the called endpoint. If problems persist, then busy-out the ISDN trunk to take it out of the hunt group.