Each octopus cable connects 8 telescope performance monitor (TPM) ports to one 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.
Each octopus consists of:
The overall cable length is 30 feet. Most of this should be a solid bundle with the legs separating only for the last 2 feet.
RJ45 Pin
Female Telco Connector Pin
Leg #1
Leg #2
Leg #3
Leg #4
Leg #5
Leg #6
Leg #7
Leg #8
twisted pair
4
27
30
33
36
39
42
45
48
3
1
7
10
13
16
19
22
6
26
29
32
35
38
41
44
47
5
2
8
11
14
17
20
23
28
31
34
37
40
43
46
49
9
12
15
18
21
24
RJ-45 pins 1 and 8 must not be connected to anything. Telco pins 25 and 50 are also not connected.
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
