Alcatel Carrier Internetworking Solutions 6648 - Manual (Page 22)

Introduction Troubleshooting the Switch System
page 1-2 OmniSwitch Troubleshooting Guide September 2005
Introduction
The CMM is the Management Module of the switch. All of the critical operations of the switch including
the monitoring is the responsibility of the CMM. CMM not only provides monitoring but also synchro-
nizes all of the NI for different operations. The operation of the CMM is the same in OS-6/7/8XXX
switches. The only difference is that OS-6/7XXX has the switching fabric inherent to the module whereas
OS-8800 has fabric at the back of the chassis.
NI has a build in CPU. Each NI has its own CPU, which acts independently of the CMM. The CPU of the
NI has to interact with the CPU on the CMM for certain operations. If this operation becomes out of sync
then it can create problems specific to that NI.
In order to troubleshoot the system, an understanding of the CMM and NI operation is essential.