Ref: 03250432
Title: CS/1 SBA-16 Pinouts and LS/1 Configuration
Date: 1/28/88

Copyright 3Com Corporation, 1991.  All rights reserved.

8 Ports per Connector, Ports 0 - 7 on J1 and Ports 8 - 15
on J2.  Connections are as follows:

    Pin 1 - GND                       Pin 26 - RXD0
    Pin 2 - GND                       Pin 27 - TXD0
    Pin 3 - DTR0                      Pin 28 - DCD0
    Pin 4 - GND                       Pin 29 - RXD1
    Pin 5 - GND                       Pin 30 - TXD1
    Pin 6 - DTR1                      Pin 31 - DCD1
    Pin 7 - GND                       Pin 32 - RXD2
    Pin 8 - GND                       Pin 33 - TXD2
    Pin 9 - DTR2                      Pin 34 - DCD2
    Pin 10 - GND                      Pin 35 - RXD3
    Pin 11 - GND                      Pin 36 - TXD3
    Pin 12 - DTR3                     Pin 37 - DCD3
    Pin 13 - GND                      Pin 38 - RXD4
    Pin 14 - GND                      Pin 39 - TXD4
    Pin 15 - DTR4                     Pin 40 - DCD4
    Pin 16 - GND                      Pin 41 - RXD5
    Pin 17 - GND                      Pin 42 - TXD5
    Pin 18 - DTR                      Pin 43 - DCD5
    Pin 19 - GND                      Pin 44 - RXD6
    Pin 20 - GND                      Pin 45 - TXD6
    Pin 21 - DTR6                     Pin 46 - DCD6
    Pin 22 - GND                      Pin 47 - RXD7
    Pin 23 - GND                      Pin 48 - TXD7
    Pin 24 - DTR7                     Pin 49 - DCD7
    Pin 25 - NC                       Pin 50 - NC


When looking at the back of an LS/1 (a CS/1 with 4 SIO modules)
the pin numbers are 1 - 25 going down the left side of the
connector and 26 - 50 down the right side.

There are several connection options as far as cabling is
concerned.  These are described on page 4-15 of the Series/1
Planning and Installation Guide.
