Digital Voice Systems VC-20-ATC-10B Especificaciones descargar pdf (Pagina 54)

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 48

7.2.2 Nibble Tools

There are three types of NIB test and integration tools:

• Nibble Data

• COM3 Monitor

• BIT Command

For the nibble data interface, the FAA20 supports the generation of a

known nibble test pattern when TEST NTX is enabled. The first voice

nibble is set to 0xF and the remaining nibble values are an incrementing

sequence beginning with 0x1. In addition, the FAA20 also can print the

received nibble frame (see DUMP NRX). Finally, the nibble data interface

supports an external data loopback, e.g. LOOP NIB.

The COM3 monitor is used to troubleshoot the COM3 virtual terminal

interface. When TEST COM3 is enabled, the FAA20 prints all COM3 traffic

to the COM2 port.

The BIT command can be used to manually toggle IO signal conductors;

however, the TEST operational mode must first be enabled to disable

automatic software control.

7.2.3 PCM Tools

The most useful PCM test tool is the external data loopback, i.e LOOP

PCM. In addition, the FAA20 also supports the transmission of an

incrementing data pattern (TEST PCMO).

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Digital Voice Systems VC-20-ATC-10B Especificaciones Pagina 54