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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).
GNDRCVXMT
DTE
100-115 VAC
-0.2A T 250V
~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.