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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.

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Rad-data-comm ASM-20 Manuale Utente Pagina 18