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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, we strongly
recommend 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 includes the operating specifications for the TRMIM-10R.
Cabletron Systems Inc. reserves the right to change these
specifications at any time without notice.
2.2.1 Ring Speed
The TRMIM-10R can be operated at a ring speed of either 4 Mbit/sec
or 16 Mbit/sec. The default ring speed is set by a hardware jumper on
the TRMIM-10R. The ring speed can be changed via a software
selection (refer to the applicable Remote LANVIEW Network
Management Users Guide) that overrides the jumper selection.
2.2.2 Connector Types
•
Trunk Coupling Unit Ports - Ten Female DB-9 connectors are
located on the front panel of the TRMIM-10R. They are labeled 1
through 10, corresponding to the ten Trunk Coupling Unit (TCU)
ports. Figure 2-1 shows the pin layout and signal connections for
these connectors.
REQUIREMENTS/SPECIFICATIONS
Page 2-5
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