Troubleshooting Cisco TelePresence System DSP Errors

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Updated:September 23, 2010

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Troubleshooting Cisco TelePresence System DSP Errors

Table Of Contents

Troubleshooting Cisco TelePresence System DSP Errors

Contents

CTS DSP Error Troubleshooting Quick Reference

Troubleshooting CTS DSP Issues

Related Information

Troubleshooting Cisco TelePresence System DSP Errors

Revised: September, 2010, OL-21351-01

Contents

This chapter contains information about troubleshooting the Cisco TelePresence System (CTS) and includes the following sections:

•CTS DSP Error Troubleshooting Quick Reference

•Troubleshooting CTS DSP Issues

•Related Information

CTS DSP Error Troubleshooting Quick Reference

The following DSP issues may be found on the CTS:

•Call Drop Issues - Audio

•Call Drop Issues - Cameras

•Call Drop Issues - Video

•Switching Issues - Cameras

Troubleshooting CTS DSP Issues

Use the information in Table 11-1 to troubleshoot DSP issues.

Table 11-1 Troubleshooting DSP Issues

Problem

Possible Cause or Description

Action

Call drops due to an audio DSP reset.

Call Drop Issues - Audio

•Audio DSP error could be related to a temporary checksum error, or bad hardware.

1. Re-dial the call.

2. If the error is a one time issue and re-dial works, it is likely a soft checksum error, which is resolved by doing a DSP reload.

3. If the DSP is constantly in error, contact TAC to run diagnostics against the audio DSP.

Call drops for non-standard cameras.

Call Drop Issues - Cameras

•These types of errors are encoder errors because the codec cannot detect non-standard cameras.

To support non-standard cameras, configure the CTS using the following admin CLI command:

set camera-sync-inhibit enable

Note This action must be performed on any codec to which non-standard cameras are connected.

See the Cisco TelePresence Administration Software Command References home page on Cisco.com for information about CLI commands.

Call drops due to a video DSP reset.

Call Drop Issues - Video

Call drops due to DSP error. There are two types of DSP errors:

•Encoder—Might be caused by loose camera cable, or a hardware issue if consistent.

•Decoder—Might be caused by corrupted network abstraction layer (NAL) from remote source, or a hardware issue if consistent.

1. Determine from your sysop logs which codec has the DSP error, and whether it is an encoder or a decoder error.

2. For encoder DSP errors:

a. Make sure that the camera cable is properly seated. Re-seat the cable if needed.

b. Perform a camera loopback test to make sure the video shows up fine.

c. Reboot the codec if needed.

d. If the problem is not resolved, contact TAC for assistance.

3. For decoder DSP errors:

a. Observe whether the error occurs with a specific remote room.

b. If the error is present, reset the remote room.

c. Reboot the codec if needed.

d. If the problem is not resolved, contact TAC for assistance.

Camera top-to-bottom switching discontinuity.

Switching Issues - Cameras

Image may take up to 1 second to normalize when the camera switches to the person who is speaking.

This is normal DSP behavior. Can also occur during Audio Addin.

Related Information

For more information about setting up, testing, and troubleshooting the CTS, see the following documentation on Cisco.com:

•Cisco TelePresence System Administration Guide

•Cisco TelePresence Administration Software Release Notes

•Cisco Unified Communications Manager Configuration Guide for the Cisco TelePresence System

•Cisco TelePresence Administration Software Error and System Messages

•Cisco TelePresence Administration Software Command References

Table 11-1 Troubleshooting DSP Issues
Problem	Possible Cause or Description	Action
Call drops due to an audio DSP reset.	Call Drop Issues - Audio •Audio DSP error could be related to a temporary checksum error, or bad hardware.	1. Re-dial the call. 2. If the error is a one time issue and re-dial works, it is likely a soft checksum error, which is resolved by doing a DSP reload. 3. If the DSP is constantly in error, contact TAC to run diagnostics against the audio DSP.
Call drops for non-standard cameras.	Call Drop Issues - Cameras •These types of errors are encoder errors because the codec cannot detect non-standard cameras.	To support non-standard cameras, configure the CTS using the following admin CLI command: set camera-sync-inhibit enable Note This action must be performed on any codec to which non-standard cameras are connected. See the Cisco TelePresence Administration Software Command References home page on Cisco.com for information about CLI commands.
Call drops due to a video DSP reset.	Call Drop Issues - Video Call drops due to DSP error. There are two types of DSP errors: •Encoder—Might be caused by loose camera cable, or a hardware issue if consistent. •Decoder—Might be caused by corrupted network abstraction layer (NAL) from remote source, or a hardware issue if consistent.	1. Determine from your sysop logs which codec has the DSP error, and whether it is an encoder or a decoder error. 2. For encoder DSP errors: a. Make sure that the camera cable is properly seated. Re-seat the cable if needed. b. Perform a camera loopback test to make sure the video shows up fine. c. Reboot the codec if needed. d. If the problem is not resolved, contact TAC for assistance. 3. For decoder DSP errors: a. Observe whether the error occurs with a specific remote room. b. If the error is present, reset the remote room. c. Reboot the codec if needed. d. If the problem is not resolved, contact TAC for assistance.
Camera top-to-bottom switching discontinuity.	Switching Issues - Cameras Image may take up to 1 second to normalize when the camera switches to the person who is speaking.	This is normal DSP behavior. Can also occur during Audio Addin.

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