Dell PowerEdge M620 Owner's Manual page 316

3 Reseat the CMC module and see if the CMC module fault indicator turns
off. See "CMC Module" on page 293 and Figure 1-22 for more information
about the module's indicators.
4 If another CMC module is available, swap the two modules.
5 If the fault indicator is off, but the serial device connected to the serial
port is not properly operating, go to step 6. If the fault indicator is off, but
the network management device connected to the network interface
connector port is not properly operating, go to step 9.
NOTE:
on the Primary CMC. This is designated by the single blue LED. See
Figure 1-22.
6 Reseat the serial cable to the serial connector on the CMC module and to
the serial device communicating with it.
7 Connect a known-working null-modem serial cable between the CMC
module and the serial device.
8 Connect a known-working serial device to the CMC module.
If the serial device and CMC module still do not communicate with each
other, see "Getting Help" on page 361.
9 Reseat the network cable to the network connector on the CMC module
and to the network device.
10 Connect a known-working network cable between the CMC module and
the network device.
NOTE:
there is no failover, check the network cable connected to port Gb2. If there is
no external management connection to the CMC, check the cable connected
to port Gb1. See Figure 1-22.
11 Connect a known-working network device to the CMC module.
If the network device and CMC module still do not communicate with
each other, see "Getting Help" on page 361.
316
Troubleshooting Your System
In an enclosure with two CMCs, serial connections are only supported
If the CMC is connected to another CMC in an adjacent enclosure and