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Default bandwidth and downspeeding
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
pipe(s)
•
when placing the call at the requested bandwidth would mean that the
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
Overview and
Introduction
Getting started
status
D14049.05
February 2009
per-call
limit for the subzone or
total
bandwidth limits for
System
VCS
Zones and
configuration
configuration
neighbors
Configuring default call bandwidth and downspeeding
To configure the default call bandwidth and downspeeding behavior using the web interface:
•
VCS configuration > Bandwidth > Configuration
You will be taken to the
Bandwidth Configuration
To configure these settings using the CLI:
•
xConfiguration Bandwidth Defaul
•
xConfiguration Bandwidth Downspee
The options are:
Default call bandwidth (kbps)
Enter the bandwidth value to be used for calls for which no bandwidth value has been specified by
the system that initiated the call.
This value cannot be blank. The default value is 384 kbps.
Downspeed per call mode
Determines what will happen if the
there is insufficient bandwidth available to place a call at the requested rate.
On: the call will be downspeeded.
Off: the call will not be placed.
Downspeed total mode
Determines what will happen if the
there is insufficient bandwidth available to place a call at the requested rate.
On: the call will be downspeeded.
Off: the call will not be placed.
Call
Bandwidth
processing
control
128
TANDBERG
VIDEO COMMUNICATIONS SERVER
.
page.
t
d
per-call
bandwidth restrictions on a subzone or pipe mean that
total
bandwidth restrictions on a subzone or pipe mean that
Firewall
Applications
Maintenance
traversal
ADMINISTRATOR GUIDE
Appendices
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