RAD Data comm ASM-20 - Manual (Page 18)

Chapter 1 Introduction ASM-20 Installation and Operation Manual
1-4 Functional Description 02-Aug-2005 10:47
shows an example of an ASM-20 rear panel. A description of the rear panel can
be found in
Electrical Installation in Chapter 2 .
The line and interface connectors are located on the rear panel of ASM-20 (see
Figure 1-5 ).
GND RCV XMT
DTE
100
-1
1
5 V
A
C
-
0.2
A
T
2
50
V
~230 V/ 0.1A T 250V
Figure 1-5. ASM-20 Rear Panel with V.35 Interface
1.3 Functional Description
This section contains functional descriptions of the circuit blocks in ASM-20,
primarily those circuits which are required for configuring the modem (see
Figure 1-6 ).
Figure 1-6. ASM-20 Block Diagram
Encoder
The encoder receives data from the DTE, then modulates the data using the CDD
“conditional diphase modulation” technique.
• 4-wire full-duplex
• 4-wire half-duplex.