The following table describes the X.25 coprocessor 37-pin connector pin assignments.
X.25 Coprocessor 37-Pin Connector Pin Assignments | |||||
Pin | Circuit Description | Symbol | X.21bis /V24 | X.21bis /V35 | X.21 |
1 | Reserved | ||||
2 | Transmitted data | TXD | x | ||
3 | Received data | RXD | x | ||
4 | Request to send | RTS | x | x | |
5 | Clear to send | CTS | x | x | |
6 | Data set ready | DSR | x | x | |
7 | Signal ground | GND | x | x | x |
8 | Carrier detect | CD | x | x | |
9 | Cable ID 0 | ID0 | x | x | |
10 | Transmitted data (A) | T (A) | x | ||
11 | Control (A) | C (A) | x | ||
12 | Received data (A) | R (A) | x | ||
13 | Indication (A) | I (A) | x | ||
14 | Transmit clock (A) | S (A) | x | ||
15 | Cable ID 1 | ID1 | x | x | |
16 | Receive clock (B) | RX CLK (B) | x | ||
17 | Transmitted data (B) | TXD (B) | x | ||
18 | Transmit clock (B) | TX CLK (B) | x | ||
19 | Receive data (B) | RXD (B) | x | ||
20 | Data terminal ready | DTR | x | x | |
21 | Remote loopback test | RLBT | x | ||
22 | Call indicate | CI | x | x | |
23 | Reserved | ||||
24 | Transmit clock | TX CLK | x | ||
25 | Test indicate | TI | x | ||
26 | Receive clock | RX CLK | x | ||
27 | Local loopback test | LLBT | |||
28 | Transmitted data (B) | T (B) | x | ||
29 | Control (B) | C (B) | x | ||
30 | Received data (B) | R (B) | x | ||
31 | Indication (B) | I (B) | x | ||
32 | Transmit clock (B) | S (B) | x | ||
33 | Reserved | ||||
34 | Receive clock (A) | RX CLK (A) | x | ||
35 | Transmitted data (A) | TXD (A) | x | ||
36 | Transmit clock (A) | RX CLK (A) | x | ||
37 | Received data (A) | RXD (A) | x | ||
NOTES: | |||||
(a) and (b) indicate pins that are associated to form pairs. |