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REQUIREMENTS/SPECIFICATIONS
• When possible, use dedicated UTP cable for token ring signals.
2.1.4 Temperature
The attenuation of PVC insulated cable varies significantly with
temperature. Plenum-rated cables are strongly recommended at
temperatures greater than 40 C to ensure that cable attenuation
remains within specification. Check the cable manufacturer's
specifications.
2.2 MAXIMUM NUMBER OF STATIONS
The maximum number of stations attached to a single token ring
network is determined by the type of media used for lobe cabling
within the network. For networks using only STP lobe cabling, the
maximum number of stations is 250. The maximum number of
stations when UTP cabling is used anywhere in a network is 150.
These limits apply for both 4 Mbit/sec and 16 Mbit/sec ring
speeds.
2.3 OPERATING SPECIFICATIONS
This section lists the operating specifications for the repeaters.
Cabletron Systems reserves the right to change these specifications
at any time without notice.
2.3.1 Ring Speed
Cabletron Systems token ring repeaters can be operated at a ring
speed of either 4 Mbit/s or 16 Mbit/s. The default ring speed is set
by a hardware jumper on the repeater board (refer to Chapter 3,
Installing the Repeater, to set the default ring speed). The default
ring speed setting can be overridden via network management
software (refer to the applicable Local Management User's Guide).
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