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- CTP2000 FXS and FXO Interface Module Cables and Pinouts

- Related Topics
- CTP2000 2W-FXS and 2W-FXO Interface Modules
- CTP2000 4W-EM Interface Connector Pinouts
- CTP2000 Series Console Cable Pinouts
- CTP Fast Ethernet and Power Cables

# CTP2000 FXS and FXO Interface Module Cables and Pinouts

## Required Cables

The CTP2000 2W-FXS and 2W-FX0 interface modules require the use of double-shielded cables (copper braid plus aluminum mylar foil) to ensure EMI Compliance.

## RTM Pinout Locations

Figure 1 shows the pinout locations for both the CTP2000 2W-FXS and 2W-FXO interface modules.

Figure 1: RTM Pinouts for CTP2000 2W-FXS and 2W-FXO Interface Modules

## FXS Connector Pinouts

The RTM for the CTP2000 2W-FXS interface module uses a RJ-21 25-pair Telco connector labeled A. The A connector has 24 FXS ports.

FXS R is connected to FXO T; FXS T is connected to FXO T.

Table 1 lists the RTM pinouts for the FXS module.

Table 1: CTP2000 FXS Connector Pinouts on the RTM

Pin | Signal | Signal | Pin
--- | --- | --- | ---
1 | Port 0 R | Port 0 T | 26
2 | Port 1 R | Port 1 T | 27
3 | Port 2 R | Port 2 T | 28
4 | Port 3 R | Port 3 T | 29
5 | Port 4 R | Port 4 T | 30
6 | Port 5 R | Port 5 T | 31
7 | Port 6 R | Port 6 T | 32
8 | Port 7 R | Port 7 T | 33
9 | Port 8 R | Port 8 T | 34
10 | Port 9 R | Port 9 T | 35
11 | Port 10 R | Port 10 T | 36
12 | Port 11 R | Port 11 T | 37
13 | Port 12 R | Port 12 T | 38
14 | Port 13 R | Port 13 T | 39
15 | Port 14 R | Port 14 T | 40
16 | Port 15 R | Port 15 T | 41
17 | Port 16 R | Port 16 T | 42
18 | Port 17 R | Port 17 T | 43
19 | Port 18 R | Port 18 T | 44
20 | Port 19 R | Port 19 T | 45
21 | Port 20 R | Port 20 T | 46
22 | Port 21 R | Port 21 T | 47
23 | Port 22 R | Port 22 T | 48
24 | Port 23 R | Port 23 T | 49

## FXO Connector Pinouts

The RTM for the CTP2000 2W-FXO interface module uses a RJ-21 25-pair Telco connector labeled A. The A connector has 24 FXS ports.

FXO T is connected to FXS R; FXO T is connected to FXS T.

Table 2 lists the RTM pinouts for the FXO module.

Table 2: CTP2000 FXO Connector Pinouts on the RTM

Pin | Signal | Signal | Pin
--- | --- | --- | ---
1 | Port 0 T | Port 0 R | 26
3 | Port 1 T | Port 1 R | 28
5 | Port 2 T | Port 2 R | 30
7 | Port 3 T | Port 3 R | 32
9 | Port 4 T | Port 4 R | 34
11 | Port 5 T | Port 5 R | 36
13 | Port 6 T | Port 6 R | 38
15 | Port 7 T | Port 7 R | 40
17 | Port 8 T | Port 8 R | 42
19 | Port 9 T | Port 9 R | 44
21 | Port 10 T | Port 10 R | 46
23 | Port 11 T | Port 11 R | 48

#### Published: 2010-05-11