Cabletron Systems TRMM-2, User Manual

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INSTALLATION
2-5
2.3.2 Port Switching MIMs
Although port switching MIMs have switches and jumpers to set their
configuration, the TRMM-2 Management Module controls the speed of
the FNB rings and the assignment of ports to different rings. This may
cause conflicts that result in the overriding of a MIM’s configuration or
bypassing a MIM ring from the FNB.
At boot-up a non-configured TRMM-2 detects the slot and configuration
of each Token Ring MIM in the hub. It remembers this information by
saving it to NVRAM. Thus, once a management module stores the
configuration of a port switching MIM:
•
Any subsequent changes to the MIM’s switches and jumpers will be
overridden.
•
MIM rings set to a different speed than FNB rings (at power-on) are
bypassed from the FNB.
Any later attempt to use the switches and jumper of a MIM to set its
configuration will be overridden until the management module’s
NVRAM is cleared or a different type of MIM is installed.
2.4 INSTALLING THE TRMM-2 MANAGEMENT MODULE
The following guidelines are helpful in configuring the system at
installation:
•
The TRMM-2 must be installed into Slot 1 of an MMAC. This is the
right-most slot in the MMAC-M8FNB and MMAC-M5FNB, or the
lowest slot in the MMAC-M3FNB (see
Figure 2-2 ).
•
Ensure that the MMAC has the proper type and number of power
supplies to support the configuration. Call the Cabletron Systems
Global Call Center to determine the exact power requirement for your
configuration.
Only qualified personnel should perform installation
procedures.