Digital Voice Systems VC-20-ATC-10B Especificações descarregar pdf (Página 19)

FAA20 Embedded NEXCOM Vocoder

Board Manual

This manual has been prepared for the Federal Aviation Administration.

FA100-00107 (March 2004) – Rev 1.0.0 Page 13

4.0 INSTALLATION

This section provides FAA20 installation instructions. The following topics

are included:

• Connecting to the FAA20. Provides guidance for board integration.

• Setting up Switch Controls. Provides guidance for configuring the

on-board switches.

• Setting up Flash Configuration Parameters. Provides guidance for

configuring other FAA20 parameters stored in flash memory.

Before installing and operating the FAA20, review the entire contents of this

manual.

While the FAA20 does possess a terminal command port for control,

configuration and status, the unit is intended to be used as an embedded

device. Operational control is implemented with signal conductors and/or

control bits in the nibble data stream.

4.1 Connecting to the FAA20

The main signal connector is the primary FAA20 interface. Section 0

contains the main connector pinout and signal descriptions. Section 5.2

provides additional interface details and timing diagrams.

4.2 Setting up Switch Controls

The switch controls are read by the FAA20 during unit power up. The

switches control interface timing and operational mode.

To setup the switch controls:

1. Select the operation mode (SW7/SW8).configuration after reviewing

the switch descriptions in Table 5.

Typically, the NORM operational mode is selected (SW7=OFF,

SW8=OFF). This mode will also work with systems designed for the

DVSI VC20 unit.

2. Select the timing sources for the PCM (SW1) and NIB (SW2)

interfaces.

Typically, external timing (switch=OFF) is selected for both

interfaces when the FAA20 is integrated with a host system. Note:

If the PCM interface is not used, the PCM switch setting does not

matter. If the DEMO mode is selected (a standalone mode), insure

both switches are in the ON position.

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