Digital Voice Systems VC-20-ATC-10B Especificações descarregar pdf (Página 51)

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 45

SYMPTOM

POTENTIAL

PROBLEMS TROUBLESHOOTING TIPS

sample/packet add/drop (SPAD) events.

SPADs should occur no more frequently

than once every few seconds to a minute.

Identify which queues are affected to locate

the timing port problem source.

• Use the MIX/ROUTE commands to setup

loopbacks to isolate the area that is causing

the bad audio.

• If the vocoder is in the voice path, check the

vocoder FEC error counter to insure it is not

incrementing, i.e. VOC FEC.

• Try lowering or raising the audio levels to

see if the condition improves. Note: While

there are peak detectors on the mixer ports,

audio clipping could occur on the far side of

the rate adapter. The adapter filter may

remove the peak levels, but the audio may

still sound bad.

ERR LED

ON Solid

Large timing offset.

Spurious error.

Flash Configuration

Empty

• Check the power up message banner on

COM1 to see if the flash parameter

configuration is empty. If empty, configure

the unit and use the ‘CFG SAVE’ command

to update the flash.

• Determine the LED appears solid due to

high number of momentary events or has

been latched on by a spurious event. To do

this, use the command ‘BIT LED4 0’. If this

command clears the condition, a spurious

event occurred (during power up, incidental

events can cause the ERR LED to light.

This is off no concern. If the command does

not clear the LED, used the COUNT

command to see if SPAD events are

occurring.

ERR LED

occasionally

blinks

Small timing offsets

are present

• Use the COUNT command to check for

sample/packet add/drop (SPAD) events.

SPADs should occur no more frequently

than once every few seconds to a minute.

Identify which queues are affected to locate

the timing port problem source. For some

system configurations, SPAD events are

normal. See Section 6.2.3.

LANYP LED

Blinks

Audio Level too high

• To isolate the signal causing the peak event,

use the PROG command to reassign the

general peak LED to specific mixer port

indicators. Adjust the MIX and/or GAM

settings to fix the high audio level problem.

No serial

port comm.

(COM1/

COM2)

Improper terminal

setup

Failed hardware

• The most typical problem may be

incompatible baud rate or hardware flow

control setup. The default setting is 115200

bps,8 data bits,1 stop bit, no parity, and no

flow control.

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