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A2.4
X.21 interface
The X.21 interface is realised as DCE (Data Communications Equipment) inter-
face. The MAGIC AE1 DAB can be connected via an X.21 cable (part of the deliv-
ery) directly to the Ensemble Multiplexer (e.g. DM-001 from Rohde & Schwarz).
TAB. 6
1
8
Connector: 15-pole SUB-D
9
15
Pin
Signal
1
SHIELD
2
TX (A)
CTL (A)
3
RX (A)
4
5
IND (A)
SCLK (A)
6
BCLK (A)
7
8
GND
9
TX (B)
CTL (B)
10
11
RX (B)
12
IND (B)
SCLK (B)
13
14
BCLK (B)
15
not used
a
PIN ASSIGNMENT: X.21 INTERFACE
Screen
Transmit Data (A)
Control (A)
Receive Data (A)
Indicate (A)
Signal Element Timing (A)
a
Byte Timing (A)
Ground
Transmit Data (B)
Control (B)
Receive Data (B)
Indicate (B)
Signal Element Timing (B)
a
Byte Timing (B)
Normally not used
I n t e r f a c e s
Direction
Electrical characteristics
Type:
DCE with Gender
Changer
In
Level:
V.11, balanced
In
Data rates:
8, 16, 24, 32, 40,
48, 56, 64, 80,
Out
96, 112, 128,
144,160, 192,
Out
224,256, 320,
384-kbit/s
Out
Range:
100 m
Out
In
In
Out
Out
Out
Out
PAG E 6 9
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