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APPENDIX E: 10BASE-T Ethernet Rear Card Module
Rear Card
10BASE-T DTE
RJ-45 Pin No.
RJ-45 Pin No.
1 (TD+)
1 (TD+)
2 (TD-)
2 (TD-)
3 (RD+)
3 (RD+)
6 (RD-)
6 (RD-)
Figure E-6. Crossover cabling.
E.5.3 C
ONNECTING THE
L
INE
I
NTERFACE
The 10BASE-T Ethernet rear card must be used with a front function card. There
are two essential requirements for connecting the line interface on the rear card.
1. These units work in pairs with one rear card connected to another rear card
over 2- or 4-wire twisted pair (2- or 4-wire operation is determined by the front
function card).
2. To function properly, the rear card needs one or two twisted pairs of metallic
wire (2- or 4-wire). The twisted pairs must be unconditioned, dry, metallic
wire, between 19 (0.9 mm) and 26 AWG (0.4 mm). Standard dial-up
telephone circuits that run through signal equalization equipment, or
standard, flat modular telephone type cable are
not
acceptable. See
Figure E-7.
Figure E-7. RJ-45 line interface.
- - - - - - - - - - - - - - - - - 1 Not connected
- - - - - - - - - - - - - - - - - 2 Not connected
- - - - - - - - - - - - - - - - - 3 (4-wire RX-)
- - - - - - - - - - - - - - - - - 4 (2-wire Tip) (4-wire TX+)
- - - - - - - - - - - - - - - - - 5 (2-wire Ring) (4-wire TX-)
- - - - - - - - - - - - - - - - - 6 (4-wire RX+)
- - - - - - - - - - - - - - - - - 7 Not connected
- - - - - - - - - - - - - - - - - 8 Not connected
