This custom-made "octopus" cable connects half of 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 without hardware flow control. To implement hardware flow control either use a different octopus cable (or for just one or two ports make an adapter that combines two non-flow-control RJ11 jacks to produce one hardware-flow-control RJ11 jack).
Two of these octopi are required to connect an entire fiber-optic multiplexer (8 DB25 connectors, 16 channels).
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
twisted pair
3
27
33
39
45
7
1
13
19
26
32
38
44
2
8
14
20
6
30
36
42
48
4
10
16
22
29
35
41
47
5
11
17
23
The octopus wiring is derived from the table below, as follows:
RJ11 Pin
Telco Connector Pin
