Digital Voice Systems VC-20-ATC-10B Especificaciones descargar pdf (Pagina 92)

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 86

8.3.21 LOOP

The LOOP command is used to enable/disable external interface loops and

is used during system troubleshooting. The loop back is implemented in

the hardware interrupt service routine.

Table 32: LOOP Command Syntax

ATTRIBUTE DESCRIPTION

SYNTAX LOOP [port [onstate]

port AUD = Audio Port (default)

NIB = Nibble Port

PCM = Digital Data Port

PARAMETERS

onstate ON Enables port external loopback.

OFF Disables port external loopback.

FLASH NO

Display current LED assignments (default setting shown).

COM1: loop

> LOOP AUD = OFF

> LOOP NIB = OFF

> LOOP PCM = OFF

EXAMPLES

Enable AUD loopback

COM1: loop aud on

> LOOP AUD = ON

The loopback delay for each port is provided below.

• Audio Loopback. There is a three sample delay.

• Nibble Loopback. There is a one frame delay.

• PCM Loopback. This is a three sample delay.

Note: Version 1.0.0 of software has a status reporting b ug. While the command correctly

enables/disables the port loopback, the loopback state may be displayed incorrectly. At

power up, all loopbacks are disabled. This bug will be fixed in the next release of the FAA20

software.

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Digital Voice Systems VC-20-ATC-10B Especificaciones Pagina 92