Cabletron Systems SmartSTACK 100 - Manual (Page 94)

A-4
Technical Specifications
Table A-2. DB9 Pin Assignments
A.3 100BASE-T PIN ASSIGNMENTS
An Ethernet twisted-pair link segment requires two pairs of wires.
Each wire pair is identified by solid and striped colored wires. For
example, one wire in the pair might be red and the other wire, red
with white stripes.
Connectors
Refer to the diagram below and note how the pins are numbered.
Be sure to hold the connectors in the same orientation when
connecting the wires to the pins.
Figure A-1. Connector Pin Numbers
Each twisted-pair link segment must have a male connector
attached to both ends. According to the 100BASE-T specification,
pins 1 and 2 on the connector are used for receiving data; pins 3
and 6 are used for transmitting data, as shown in Table A-3.
ELS100-16TX RJ45 (female) DB9 pin (female)
Pin 1 (Rx) Pin 2
Pin 4 (Tx) Pin 3
Pin 5 (GND) Pin 5
1
8
8
1