Digital Voice Systems VC-20-ATC-10B Especificações descarregar pdf (Página 50)

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 44

7.0 MAINTENANCE AND TEST

This section provides an maintenance and test information. The following

topics are included:

• Troubleshooting Tips. Includes a troubleshooting table to assist with

problem solving.

• Test and Integration Tools. Discusses audio, PCM, and nibble

interface test and integration tools.

• Upgrading the FAA20 Software. Provides instructions for loading

new software.

• Vocoder Test Vector Support. Provides instructions for running test

vectors through the FAA20. Also includes a description of ASCII test

vector conversion utilities.

7.1 Troubleshooting Tips

Table 9 provides troubleshooting tips.

Table 9: Troubleshooting Table

SYMPTOM

POTENTIAL

PROBLEMS TROUBLESHOOTING TIPS

No Audio Improper Mixer Setup

Improper Router Setup

Failed Front End

Improper Timing Setup

• Use the CFG command to verify current

audio flow and clock settings.

• Starting at one end of the audio flow, use

the MIX/ROUTE commands to setup

loopbacks to confirm flows through points in

the system. Insure you have proper levels

setup.

• Use the TONE/MIXER commands to send a

tone out an interface that doesn’t appear to

be working.

• Insure you have proper timing signals for

digital interfaces. If the timing is working,

you will get interrupts. Use the PROG

command to send interrupt status to the

LEDs, i.e. DIG_HWI, LVP_SWI, etc.

• If the vocoder is in the path, the nibble

interface MUST have timing. The nibble

interface triggers the vocoder tasks. Thus,

you need nibble timing EVEN IF you are not

using that interface.

Bad Audio Improper Timing

Improper Signal Level

• Insure that the audio peak LED indicator

(typically LED1) is not blinking. If blinking,

refer to associated troubleshooting tips

below.

• Use the COUNT command to check for

1 2 ... 45 46 47 48 49 50 51 52 53 54 55 ... 108 109

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