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4
Configure the interface modules for V.36,
X.21 and RS530
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.
X.21
TXD (B) 9
10
RXD(B) 11
12
RCLK(B) 13
14
15
15 pin DSUB
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
TXD (B) 14
TCLK DCE(A) 15
RXD(B) 16
RCLK(A) 17
1 SCREEN
REQ SEND(B) * 19
2 TXD (A)
DTE READY(A) 20
3
4 RXD(A)
5
DTE READY(B)* 23
6 RCLK
TCLK DTE(A) 24
7
8 GND
* not for V.36
Chapter 8
Configuring the digital
communication modules
V.36, RS530
1 SCREEN
2 TXD (A)
3 RXD (A)
4 REQ SEND (A)
5
18
6
7 GND
8
21
9 RCLK (B)
22
10
11 TCLK DTE (B)
12 TCLK DCE (B)
25
13
25 pin DSUB
xx00000544.vsd
51
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