This custom-made "octopus" cable connects one Canoga-Perkins CMX-808 fiber-optic RS-232 multiplexer to a patch panel or 8-port harmonica with 6-wire 6-position RJ11 jacks. The patch panel or harmonica must be USOC-wired and have a male Telco connector, since this cable has a female Telco connector.
The RJ11 jacks will be wired with hardware flow control. If you can do without hardware flow control, you can gain ports by using a different octopus cable that does not support hardware flow control and uses those channels for additional ports. If you want a mix, you can use one of these octopus cables for four ports (leaving four ports on that harmonica unconnected) and a non-hardware-flow-control octopus cable for eight ports. More complex mixes require custom cabling because each octopus cable takes up an entire telco cable.
Each octopus consists of:
Each leg is two feet (2') long unless otherwise specified. The wiring is as follows. Use of twisted pair wire is optional, but if it is used, it must be used as shown in the table.
If solder-type DB25 connectors are used, the soldered pins must be protected with heat-shrink tubing (or some other insulation).
DB25 Pin
Female Telco Connector Pin
Leg #1
Leg #2
Leg #3
Leg #4
Leg #5
Leg #6
Leg #7
Leg #8
twisted pair
3
27
30
33
36
39
42
45
48
7
1
4
10
13
16
19
22
26
29
32
35
38
41
44
47
2
5
8
11
14
17
20
23
6
28
31
34
37
40
43
46
49
9
12
15
18
21
24
The octopus wiring is derived from the table below, as follows:
RJ11 Pin
Signal
Telco Connector Pin
Tx
...
Tx Gnd
Rx Gnd
Rx
Tx Flow
Rx Flow
