51
Configure the interface modules for V.36,
X.21 and RS530
Chapter 8
Configuring the digital
communication modules
4
Configure the interface modules for V.36,
X.21 and RS530
The connector for X.21 is a 15 pin DSUB according to X.21 standard. For RS530 the
connector is a 25 pin DSUB according to RS530 standard. The same 25 pin DSUB is
also used for the V.36 connection contrary to the 37 pin DSUB listed in the standard.
The pin lay-out is found in figure 12 and the explanation to designation in table 6.
Figure 12: DSUB connectors
Table 6: DSUB connector explanation
Designation
Explanation
A
Designations of terminals according to CCITT, EIA etc.
B
Designations of terminals according to CCITT, EIA etc.
DCE
Data communication equipment (= multiplexer, etc.)
DTE
Data terminal equipment (= protection)
DTE READY
Data terminal ready (follows auxiliary voltage)
GND
Earth (reference for signals)
RCLK
Receiver signal timing
* not for V.36
1 SCREEN
2 TXD (A)
3
4 RXD(A)
5
6 RCLK
7
8 GND
TXD (B) 9
10
RXD(B) 11
12
RCLK(B) 13
14
15
15 pin DSUB
X.21
25 pin DSUB
1 SCREEN
2 TXD (A)
3 RXD (A)
4 REQ SEND (A)
5
6
7 GND
8
9 RCLK (B)
10
11 TCLK DTE (B)
12 TCLK DCE (B)
13
TXD (B) 14
TCLK DCE(A) 15
RXD(B) 16
RCLK(A) 17
18
REQ SEND(B) * 19
DTE READY(A) 20
21
22
DTE READY(B)* 23
TCLK DTE(A) 24
25
V.36, RS530
xx00000544.vsd
