3Com EISA 10/100BASE-T manual RJ-45 Connector Pin Assignments, Cabling Requirements

A-2 APPENDIX A: SPECIFICATIONS

RJ-45 Connector Pin Assignments

Figure A-1 shows the RJ-45 connector pin assignments.

R D – ( 6 ) R D + ( 3 ) T D – ( 2 ) T D + ( 1 )

8

7

6

5

4

3

2

1

12 345678

Figure A-1 RJ-45 Connector Pin Assignments

When Category 5 UTP cable is used, the pin assignments are identical for 10BASE-T and 100BASE-TX.

Cabling Requirements

When properly connected to a 10BASE-T network, the

Fast EtherLink EISA adapter operates in 10BASE-T mode and supports standard 10BASE-T cable topologies and types, including Category 3, 4, or 5 UTP for 10 Mbps.

When properly connected to a 100BASE-TX network, the Fast EtherLink EISA adapter operates in 100BASE-TX mode and supports Category 5 UTP cable only.

In either case, the cable, quality, distance, and connectors must comply with the EIA/TIA 568 “Commercial Building Wiring Standard” and the Technical Services Bulletin TSB38 standards.

The maximum UTP cable distance is 100 meters at either speed.