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FNB 1 while the TRMM-2's STATION port interface is operating
through that Cluster. For if allowed, such a switch would create the
prohibited condition of redundant management on FNB 1.
1.2.4
Automatic Configuration at Power-Up
The management module in the TDRMIM's host MMAC stores all
user-configured ring assignments and speed settings in its battery-backed
NVRAM (Non-Volatile Random Access Memory). Upon TDRMIM reset,
the MMAC's resident management module reissues its stored
configurations to the TDRMIM so that all ring assignments and speed
settings established before power-down are reinstated at next power-up.
Instructions from a management module always override the TDRMIM's
hardware defaults. However, there are two conditions under which the
TDRMIM will not receive management configuration instructions:
•
no functional management module is present in the hub; or
•
the TDRMIM is not recognized by the management module—either
the TDRMIM is powering up for the first time in its current hub slot,
or the latest hub configuration has been cleared from the management
module's NVRAM.
If the TDRMIM does not receive management configuration instructions
at start-up, it uses its hardware defaults for ring speed and ring
assignment configurations.
Hardware Default Configuration
The TDRMIM's default ring speed for FNB Ring 1 is user-configurable.
Use Switch #1 on SW1 (see Section 2.5.1, Switchblock SW1) to select a
default ring speed of either 4 Mbps or 16 Mbps for FNB Ring 1. All other
rings default to 16 Mbps.
The TDRMIM's default ring assignments are factory set (are not
user-configurable): Cluster 1 defaults to FNB ring 1 and Cluster 2 defaults
to FNB ring 2. Because of these default assignments, even in the absence of
a port-assigning management module to address FNB rings 2-4, all
contiguously installed TDRMIMs connect to each other across both FNB
ring 1 and FNB ring 2. Therefore, in addition to the usual Token Ring on
FNB ring 1, TDRMIM defaults provide for a second fully viable (though
possibly unmanaged) Token Ring on FNB ring 2.
About the TDRMIM
Page 1-7
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