REQUIREMENTS/SPECIFICATIONS
2-8
•
For single telecommunications closet rings, lobe lengths should
not exceed 100 meters or 22 to 24 AWG wire from the attaching
device and the TCU port.
•
When possible, use dedicated UTP cable for token ring signals.
2.2
MAXIMUM NUMBER OF STATIONS
The maximum number of stations in a single ring, using UTP lobe
cabling is 150 stations using category 5 cabling or 100 stations using
category 3 or 4 cabling.
The maximum number of stations when using STP lobe cabling is
250 stations
.
2.3
OPERATING SPECIFICATIONS
This section describes the operating specifications for each of the
active token ring concentrator modules. Cabletron Systems
reserves the right to change these specifications at any time without
notice.
2.3.1
Connector Types
The concentrator module TCU ports are internally crossed-over to
provide connection of station lobe cabling via female RJ-45
receptacles on the front panel. Figure 2-2 shows the pinouts
required for the mating (male) RJ-45 connectors for both UTP and
STP versions of the concentrator modules. The RJ-45 connectors
(male and female) used with the TRMIM-42A and TRMIM-44A are
encased in a metallic shield that is connected to the cable shield.