Cisco TelePresence System Codec C60 Handbuch zur Fehlersuche - Seite 8

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Cisco TelePresence System Codec C60 Handbuch zur Fehlersuche

Network related issues

if you are experiencing bad video quality in calls with symptoms such as pixilation, smearing or pulsing

of the image, the most likely cause for this is packet loss in the network.

Packet loss

You can check the packet loss information from the web interface, on the Touch panel if one is connected

to your system, or on the System Information screen using a remote control.

Packet loss statistics – Touch panel

if you have a Touch panel connected, tap the

you will see the call status shown below. Here you can see the current packet loss statistics as well as

the total packet loss statistic (average packet loss percentage over the whole call).

Packet loss statistics – remote control

press the Home button on the remote control to open the on-screen menu. Navigate to

Settings -> System Information

to open the System Information screen. You can find the packet loss

information under the Video heading.

Packet loss statistics - web interface

To check the packet loss on the current call log in to the web interface. On the top navigation panel

click

Call Control -> Call Control

and then under Participants select the

details visible. Now you can see the packet loss for the transmit and receive video and audio streams.

As you can see below there is a constant 5% packet loss on both the transmit and receive streams

which needs to be investigated. This is the loss percentage calculated over the entire call time frame.

D15029.01 Troubleshooting Guide TC6.0, April 2013.

Settings

icon on the screen. Then tap

Call Status

symbol to expand the

On the web interface you can only see loss averaged for the duration of the call, meaning loss could

have spiked higher during the call.

and

Packet loss – more information

Even a small amount of loss, for example 0.5%, can have noticeable effects on the image quality.

if you are calling another system running TC software directly (a point to point call), a technology called

Clearpath will be used. This helps to mask the effects of packet loss and is enabled by default. When

calling systems that do not support Clearpath, call quality will appear worse if there is packet loss, than

a call to another TC based system with the same percentage loss. When Clearpath is not used the

system will try and hide the loss when displaying the image (decoder concealment) and will down speed

the bandwidth of the call. This results in the resolution being decreased thus lowering the amount of

data being transmitted and thus hopefully reducing the packet loss. See "Appendix A - Other sources

of information" on page 31 for information on the Clearpath whitepaper.

packet loss can be caused by many issues and after making some basic checks on the endpoint you

should start to investigate your network to see where the loss is occurring and take steps to eliminate

this loss.

Network Port speed

it is worth checking the duplex/speed settings of the network port on the system and network switch

to ensure they are set to the same settings. We recommend that both the network interface on the

system and the interface port of the network switch both be set to auto. For example if one is set at a

fixed rate 100/full and the other to auto, the port speed and duplex negotiation can fail and produce

mismatched settings. To check the status of the port on the codec go to

and click on

Network 1

and look under the

that the speed matches that in the network switch.

To check the configuration of the network port look under

then click on

Network 1

and look under

if both the network switch and the system are set to auto and the port speed and duplex settings do

not match, set both to manual values (e.g. 100/full), restart and retest.

Troubleshooting Guide TC6.0

Configuration -> System Status

Ethernet

section. Ensure the system is using full duplex and

Configuration -> System Configuration

General Settings.

and