Adapting To An Att258A Cabling System - HP A4500A - VMEbus Single Board Computer 744 Motherboard Manual

Adapting to an ATT258A cabling system

The ATT258A cabling system uses 8 wires per port and provides 6 ports per 25 pair
cables (or 50-pin telco-like connectors).
The following table provides a cabling conversion using cross connect blocks
(punch down blocks) from ATT356A to ATT258A.
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
ATT258A
Pin # on
Jumpers
50-pin
connector
<---------> 26
<---------> 1
<---------> 27
<---------> 2
<---------> 28
<---------> 3
29
4
<---------> 30
<---------> 5
<---------> 31
<---------> 6
<---------> 32
<---------> 7
33
8
<---------> 34
<---------> 9
<---------> 35
<---------> 10
<---------> 36
<---------> 11
37
12
<---------> 38
<---------> 13
<---------> 39
<---------> 14
<---------> 40
Adapting to an ATT258A cabling system
Port number -
Pin # on RJ45
RS-423/RS-232
connector
signal
P0 - RTS 5
P0 - CTS 4
P0 - RXa/RD 1
P0 - RXb/- 2
P0 - TXa/TD 3
P0 - TXb/SGND 6
P0 - Not Used 7
P0 - Not Used 8
P1 - RTS 5
P1 - CTS 4
P1 - RXa/RD 1
P1 - RXb/- 2
P1 - TXa/TD 3
P1 - TXb/SGND 6
P1 - Not Used 7
P1 - Not Used 8
P2 - RTS 5
P2 - CTS 4
P2 - RXa/RD 1
P2 - RXb/- 2
P2 - TXa/TD 3
P2 - TXb/SGND 6
P2 - Not Used 7
P2 - Not Used 8
P3 - RTS 5
P3 - CTS 4
P3 - RXa/RD 1
P3 - RXb/- 2
P3 - TXa/TD 3
9
93