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Configuration Specifications
Management
For a management module to fully manage a ring, it requires a
network-monitoring interface with the ring. Whereas single-ring
management modules have only one network interface,
port-assigning management modules provide for multiple ring
interfaces, making it possible for a single management module to
fully manage any or all of the rings in the hub. (The TRMM-2 can
manage two Token Rings and the TRMM-4 can manage four.) This
leaves all other hub slots available for concentrator modules,
eliminating the power demands of additional management
modules, and actually reducing the overall cost per port in the
MMAC. Meanwhile, port switching increases the number of Token
Rings in the hub and makes them easier to access.
New Terminology
The four vertically stacked FNB rings are now referred to as FNB
rings 1, 2, 3, and 4. FNB ring 1 is the same ring that has connected
all earlier generation, single-ring MIMs (e.g., TRMIM), and was
addressed in earlier manuals as "the FNB ring," or simply "the
FNB." The term "the FNB" now refers collectively to the channels
and connectors of the MMAC backplane's communications bus
which supports FNB rings, interconnects MIMs, and carries all
user-data.
A.5 Configuration Specifications
Single-ring MIMs and port switching MIMs are compatible and
interconnectable across FNB ring 1. However, as shown in Figure
A-3, single-ring MIMs cannot support communications across FNB
rings 2, 3, or 4. If installed in a slot between port switching MIMs, a
single-ring MIM will isolate the additional FNB rings established
on either side of the single-ring MIM; this configuration is not
recommended. All port switching MIMs should be grouped together
in the right-most slots of the MMAC as shown in Figure A-3.
Single-ring MIMs still have the ability to segment FNB ring 1 (as
shown in Figure A-3). They still view the FNB as having only one
Page A-5
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