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Specifications A - 7
Note that the non-plenum type 1, 2, and 6 cables are insulated with
polyethylene. The plenum type 9 cable is insulated with polyvinylchloride.
*Voice pairs in the IBM Type 2 cable cannot be used for Token Ring data
transmission.
Twisted Pair Connector Specifications
The IEEE 802.3 10BASE-T standard for RJ-45 pinouts must be used, as
described below. 10BASE-T uses only 2 of 4 pairs of wire: pins 1 & 2 and
pins 3 & 6. If the pairs are not configured this way, the connection will not
work properly.
Level 3 or higher cable should have the following pin pairings:
❑ Pair 1 is pins 4 and 5 (not used)
❑ Pair 2 is pins 3 and 6
❑ Pair 3 is pins 1 and 2
❑ Pair 4 is pins 7 and 8 (not used)
Refer to Figure A-1 for an example of the recommended TIA-568A standard
pinouts for this connector and cable.
RJ-45 Connector Pinouts
Figure A-1 shows RJ-45 connector pin assignments for the 24-Port Module,
Model Number 5124M-TP. This model uses MDI-X (crossed-over) wiring and
only uses:
❑ Pins 1 and 2 (station transmit) - 5124M-TP receive
❑ Pins 3 and 6 (station receive) - 5124M-TP transmit