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2.3.4 Connectors
TCU Ports - The physical lobe connection from the TCU port on the
repeater to the token ring station does not require a crossover cable.
The TCU and token ring station connectors are wired such that the
transmit pair (TX+, TX-) from the repeater connects to the receive
pair (RX+, RX-) of the station and the receive pair from the repeater
connects to the transmit pair of the station. This provides the
necessary Crossover or Null Modem Effect.
The TRRMIM-2AT and TRRMIM-4AT provide TCU port
connections via female RJ-45 receptacles on the front panel.
Figure 2-2 shows the pinouts required for the mating (male) RJ-45
plugs for both UTP and STP versions of the repeaters. The RJ-45
connectors (male and female) used with the TRRMIM-4AT are
encased in a metallic shield that is connected to the cable shield. The
shield continuity is maintained by contacts within the female RJ-45
that contact the metallic casing of the male RJ-45 on the STP lobe
cabling.
TRRMIM-2AT
TRRMIM-2A
8
7
TX+
6
RX–
5
RX+
4
TX–
3
2
1
(TRRMIM-2AT and TRRMIM-4AT only)
REQUIREMENTS/SPECIFICATIONS
MALE
RJ-45
Figure 2-2 TCU Port Pinouts
TRRMIM-4AT
TRRMIM-4A
8
7
TX+
6
RX–
MALE
5
RX+
RJ-45
4
TX–
3
2
1
Cable
Shield
Cable
Shield
Page 2-17
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