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A-80 Cisco 4000 Series Installation Guide
Ethernet Cable Pinouts
100BaseT Connector Pinouts
The two interface receptacles on the Fast Ethernet network processor module are a single
MII, 40-pin, D-shell type, and a single RJ-45. Each connection supports IEEE 802.3u
interfaces that are compliant with the 100BaseX and 100BaseT standards. Only one can be
used at a time.
The RJ-45 connection does not require an external transceiver. The MII connection requires
an external physical sublayer (PHY) and an external transceiver. Figure A-17 shows the
RJ-45 connectors.
1. Any pin not shown is not
connected.
Table A-30 RJ-45 10BaseT Connector Pinouts
Pin
1
Description
1 TX+
2 TX–
3 RX+
4–
5–
6 RX–
7–
8–
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