REQUIREMENTS/SPECIFICATIONS
Page 2-5
2.1.7 Noise
Noise can be caused by either crosstalk or externally induced
impulses. If noise induced errors are suspected, it may be necessary
to re-route cabling away from potential noise sources (motors,
switching equipment, high amperage equipment), or to ensure that
the electrical wiring in the area is properly wired and grounded.
2.1.8 Temperature
The attenuation of PVC insulated cable varies significantly with
temperature. At temperatures greater than 40
°
C (104
°
F), it is
strongly recommended that you use plenum-rated cables to ensure
that cable attenuation remains within specification. Check the cable
manufacturer’s specifications.
2.2 OPERATING SPECIFICATIONS
This section describes the operating specifications for the
TRMIM-20R. Cabletron Systems, Inc. reserves the right to change
these specifications at any time without notice.
2.2.1 Ring Speed
The TRMIM-20R can be operated at a ring speed of either 4 Mbit/s or
16 Mbit/s. Selection of the ring speed is accomplished either by a
hardware jumper on the TRMIM-20R or by software selection. The
software selection overrides the jumper selection.
2.2.2 Ring Sequence
When multiple token ring boards (set to the same ring speed) are
installed in adjacent slots within an MMAC, they can be attached via
the FNB to create a larger ring network. The default configuration
for the TRMIM-20R attaches boards in adjacent slots automatically
at power on, but the configuration can be modified via network
management software, so that adjacent boards are attached or
detached, resulting in changes in the ring sequence.
