APPENDIX A: ST-500 TRANSCEIVER SPECIFICATIONS
Page A-4
ST-500 INSTALLATION GUIDE
A.5
Interface Connector Pinout Identification
The ST-500 transceiver is compliant with the IEEE 802.3 standard and
compatible with Ethernet versions 1.0 and 2.0. However, the AUI cable
used to connect a device to the ST-500 transceiver is dependent on the
Ethernet version of that device. The cable wiring configurations accord-
ing to IEEE 802.3 and Ethernet versions 1.0 and 2.0 are as follows:
Ethernet V1.0
(3) 22 AWG pairs. (1) 20 AWG Inner & Outer shield common at the con-
nector shell and Pin 1.
Ethernet V2.0
(4) 20 AWG pairs, Inner & Outer shield common at the connector shell
and Pin 1.
IEEE 802.3
(4) 20 AWG pairs, Inner & Outer shield isolated from each other. Outer
shield connected to the connector shell and Pin 1.
Pin
Description
Pin
Description
1
Logic Ref.
9
Collision –
2
Col
10
Transmit –
3
Tr
11
Logic Ref.
4
Logic Ref.
12
Receive –
5
R
13
Power (+12 Vdc)
6
Power return
14
Logic Ref.
7
N/C
15
N/C
8
Logic Ref.
Note: The shell is connected to the cable shield and case.
