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D 14049.01
07.2007
119
TANDBERG VIDEO COMMUNICATION SERVER
ADMINISTRATOR GUIDE
Bandwidth Control
Introduction
Getting
Started
System
Overview
System
Configuration
H.323 & SIP
Configuration
Registration
Control
Zones and
Neighbors
Call
Processing
Firewall
Traversal
Bandwidth
Control
Maintenance
Appendices
TANDBERG VIDEO COMMUNICATION SERVER
ADMINISTRATOR GUIDE
Bandwidth
Control
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.
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. 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
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 per-call limit for the
subzone or pipe(s)
when placing the call at the requested
bandwidth would mean that the total
bandwidth limits for that subzone or pipe(s)
would be exceeded.
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Default Call Bandwidth, Insufficient Bandwidth and Downspeeding
Configuring the 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)
Enter the bandwidth value to be used for
calls for which no bandwidth value has been
specified.
Downspeed per call mode
Determines what will happen if the per-call
bandwidth restrictions on a subzone or pipe
mean that 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 total
bandwidth restrictions on a subzone or pipe
mean that 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.
Save
Click here to save your changes
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.
This value cannot be blank. The
default value is 384 kbps.
Bandwidth Control