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Default Bandwidth and Downspeeding
TANDBERG VIDEO COMMUNICATIONS SERVER ADMINISTRATOR GUIDE
About the Default Call Bandwidth
Usually, when a call is initiated the endpoint will include in the request the amount of bandwidth it wishes to use. For those cases where the endpoint has not specified the bandwidth, you can set the VCS to apply a default bandwidth value.
About Downspeeding
If bandwidth control is in use, there may be situations when there is insufficient bandwidth available to place a call at the requested rate. By default (and assuming that there is some bandwidth still available) the VCS will still attempt to connect the call, but at a reduced bandwidth – this is known as downspeeding.
Downspeeding can be configured so that it is applied in either or both of the following scenarios:
•when the requested bandwidth for the call exceeds the lowest
•when placing the call at the requested bandwidth would mean that the total bandwidth limits for that subzone or pipe(s) would be exceeded.
You can turn off downspeeding, in which case if there is insufficient bandwidth to place the call at the originally requested rate, the call will not be placed at all. This could be used if, when your network is nearing capacity, you would rather a call failed to connect at all than was connected at a lower than requested speed. In this situation users will get one of the following messages, depending on the message that initiated the search:
•Exceeds Call Capacity
•Gatekeeper Resources Unavailable
Configuring Default Call Bandwidth and Downspeeding
The default call bandwidth and downspeeding behavior are configured via:
•VCS Configuration > Bandwidth > Configuration.
You will be taken to the Bandwidth Configuration page.
•xConfiguration Bandwidth Default
•xConfiguration Bandwidth Downspeed
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| Default call bandwidth (kbps) |
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| Enter the bandwidth value to |
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| be used for calls for which |
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| no bandwidth value has been |
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| specified by the system that |
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| initiated the call. |
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| This value cannot be |
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| blank. The default |
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| value is 384 kbps. |
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| Downspeed per call mode |
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| Determines what will happen |
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| if the |
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| restrictions on a subzone |
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| or pipe mean that there |
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| is insufficient bandwidth |
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| available to place a call at the |
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| requested rate. |
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| On: the call will be |
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| downspeeded. |
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| Off: the call will not be |
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| placed. |
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Save | Downspeed total mode | ||||||
Click here to save your changes | Determines what will happen if the total bandwidth restrictions on a subzone | ||||||
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| or pipe mean that there is insufficient bandwidth available to place a call at the | ||||
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| requested rate. | ||||
On: the call will be downspeeded.
Off: the call will not be placed.
Introduction | Getting Started |
| Overview and |
| System |
| VCS |
| Zones and |
| Call | Bandwidth | Firewall |
| Maintenance |
| Appendices |
| Status |
| Configuration |
| Configuration |
| Neighbors |
| Processing | Control | Traversal |
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D14049.03 |
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MAY 2008 |
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