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2.2 MAXIMUM NUMBER OF STATIONS
The maximum number of stations in a single ring, using STP lobe
cabling is dependent on the ring speed. At 4 Mbit/s, up to 250
stations can be connected. At 16 Mbit/s, up to 136 stations can be
connected.
When UTP lobe cabling is used anywhere on the ring, the number of
stations is limited to 72 stations, regardless of the ring speed.
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-42 and TRMIM-44 are encased in
a metallic shield that is connected to the cable shield.
8
7
TX+
6
RX–
MALE
5
RJ-45
4
RX+
3
TX–
2
1
Figure 2-2. Concentrator Module TCU Port Pinouts
REQUIREMENTS/SPECIFICATIONS
Trunk Coupling Unit
(TCU) Port
8
7
TX+
6
RX–
5
4
RX+
3
TX–
2
1
Cable Shield
MALE
RJ-45
Cable Shield
Page 2-7
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