AVT MAGIC Series - Page 145

PAGE 145
Interfaces
A4.2.3 X.21 interface
The X.21 interface is realised as DCE (Data Communications Equipment).
TAB. 10 PIN ASSIGNMENT: X.21 INTERFACE
Connector: 15-pin SUB-D
Pin Signal Direction Electrical characteristics
1 Schirm Type: DCE with
Gender
Changer
Level: V.11, symmetric
Data rates: 8, 16, 24, 32,40, 48,
56, 64, 80, 96, 112, 128,
144, 160, 192, 224,256,
320, 384-kbit/s
Maximum cable length: 100 m
2 TX a Transmit Data a
input
3CTL a Control a
input
4 RX a Receive Data a
output
5 IND a Indication a
output
6 SCLK a Signal Element Timing a
output
7BCLK a
a
Byte Timing a
a
usually it will not be used
output
8 GND Masse
9 TX b Transmit Data b
input
10 CTL b Control b
input
11 RX b Receive Data b
output
12 IND b Indicate b
output
13 SCLK b Signal Element Timing b
output
14 BCLK b
a
Byte Timing b
output
15 nicht benutzt
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