Adapting To A 10Baset Cabling System - HP A4500A - VMEbus Single Board Computer 744 Motherboard Manual

9

Adapting to a 10BaseT cabling system

Adapting to a 10BaseT cabling system
DTC Pin # on Port number -
50-pin RS-423/RS232
connector signal
26 P0 - RTS
1 P0 - CTS
27 P0 - RXa/RD
2 P0 - RXb/-
28 P0 - TXa/TD
3 P0 - TXb/SGND
29 P1 - RTS
4 P1 - CTS
30 P1 - RXa/RD
5 P1 - RXb/-
31 P1 - TXa/TD
6 P1 - TXb/SGND
32 P2 - RTS
7 P2 - CTS
33 P2 - RXa/RD
8 P2 - RXb/-
34 P2 - TXa/TD
9 P2 - TXb/SGND
35 P3 - RTS
10 P3 - CTS
36 P3 - RXa/RD
11 P3 - RXb/-
37 P3 - TXa/TD
12 P3 - TXb/SGND
90
The 10BaseT cabling system uses 4 wires per port and provides 12 ports on a 25 pair
cable (or on a 50-pin telco-like connector).
The DTC provides 8 direct connect RS-232 or RS-423 ports on a 50-pin connector.
The following table provides a cabling conversion using cross-connect blocks
(punch down blocks) from ATT356A to 10BaseT.
Jumpers
<--------->
<--------->
<--------->
<--------->
<--------->
<--------->
<--------->
<--------->
<--------->
<--------->
<--------->
<--------->
<--------->
<--------->
<--------->
<--------->
10BaseT
Port number -
Pin # on
RS-423/RS-232
50-pin
signal
connector
26 P0 - RXa/RD
1 P0 - RXb/-
27 P0 - TXa/TD
2 P0 - TXb/SGND
28 P1 - RXa/RD
3 P1 - RXb/-
29 P1 - TXa/TD
4 P1 - TXb/SGND
30 P2 - RXa/RD
5 P2 - RXb/-
31 P2 - TXa/TD
6 P2 - TXb/SGND
32 P3 - RXa/RD
7 P3 - RXb/-
33 P3 - TXa/TD
8 P3 - TXb/SGND
Pin # on RJ45
connector
1
2
3
6
1
2
3
6
1
2
3
6
1
2
3
6