Cisco OL-4015-08 Guide de dépannage télécharger pdf (Page 104)

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Cisco Broadband Local Integrated Services Solution Troubleshooting Guide

OL-5169-01

Chapter 3 Trouble Isolation Procedures

Call Traces

Traces are records of the message flows through the Cisco BTS 10200 Softswitch. Traces are useful

when problem calls are reaching the Cisco BTS 10200 Softswitch basic call module (BCM). If a trace

is empty, the call has not reached the BCM.

A problem call can be readily identified through the presence of non-idle bearer circuits entries in the

debug logs. In most cases, the logs need to be operating at debug level to be useful; however, there are

performance implications when using this level of logging.

Examination of the debug log file is most useful for tracking down:

• Configuration errors

• Signaling link problems

• Problems with non-established calls

Fault identification up to this point is largely a matter of gathering background information to gain a

picture of the platform and signaling states. From this point, however, the decision to attempt a trace or

to examine the logs depends on several factors, including the level of personal experience.

Caution Contact Cisco TAC before attempting a trace or generating debug level logs.

Component States

The Cisco BTS 10200 Softswitch can be used to monitor and, to a certain extent, administer the states

of some solution components including the following:

• SS7 Signaling Trunks

• SS7 Signaling destinations

• Aggregation routers, which are used as Cable Modem Termination Systems (CMTSs)

• Media gateways (MGWs), which are used as trunking gateways

• Trunk groups (TGs)

• Trunks

• Subscriber terminations (Media Termination Adapters (MTAs))

The following solution components have the following dependencies:

• Allowed subscriber states depend on the current CMTS or MTA state.

• Allowed trunk states depend on the current Trunk Group state, which, in turn, depends on the current

Trunking Gateway state.

There are two types of independent service states possible for solution components:

• Administrative—The state the Cisco BTS 10200 operator sets for the link to the component

• Operational—The physical state of the component itself, or the link to the component

The independence of these two service states is illustrated by the following example:

A Cisco BTS 10200 Softswitch operator executes the command to place a media gateway connection in

service. The administrative state of the connection is “In Service” (ADMIN_INS). However, the link

between the Cisco BTS 10200 and the media gateway might be out or the media gateway itself might be

placed out of service, so the operational state of the media gateway link is MGW_STATUS_DOWN.

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Cisco OL-4015-08 Guide de dépannage Page 104