D 14049.01
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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 Appe ndices
TANDBERG VIDEO COMMUNICATION SERVER
ADMINISTRATOR GUIDE
Bandwidth
Control
Types of Limitations
You can apply bandwidth limits to the D efault Subzone, Traversal Subzone a nd all manually
configured subzones. The ty pes of limitations you can appl y vary depending on the t ype of
subzone, as follows:

Limitation Description Can be applied to

Total Limits the total concurrent b andwidth being
used by all endpoints in the subzone at a ny
one time.
Default Subzone
Traversal Subzone
Manually configured subzones
•
•
•
Per call intra Limits the bandwidth of any indi vidual call
between two endpoints wit hin the subzone.
Default Subzone
Manually configured subzones
•
•
Per call inter Limits the bandwidth of any indi vidual call
between an endpoint in the subzo ne, and an
endpoint in another subzone or zon e.
Default Subzone
Traversal Subzone
Manually configured subzones
•
•
•
For all these settings, a bandwi dth mode of:
None will mean that no bandwidt h is allocated and therefore no c alls can be made.
Limited will mean that limits are ap plied. You must also enter a value in the cor responding
bandwidth (kbps) field.
Unlimited will mean that no restri ctions will be applied to the amou nt of bandwidth being used.
•
•
•
Use subzone bandwidth limits if yo u want to configure the bandwi dth available between one
specific subzone and all other su bzones or zones.
Use Pipes if you want to configure th e bandwidth available bet ween one specific subzone
and another specific subzon e or zone.
If your bandwidth configur ation is such that multiple ty pes of bandwidth restric tions are placed on
a call (for example, if there are both subzo ne bandwidth limits and pip e limits), the lowest limit will
always apply to that call.
How Different Bandwidth Limitations are Managed
In situations where there are dif fering bandwidth limit ations applied to the same link , the lower
limit will always be the one used when r outing the call and taking ba ndwidth limitations into
account.
For example, Subzone A may have a per call i nter bandwidth of 128. This mea ns that any
calls between Subzone A and any oth er subzone or zone will be limited to 128k bps. However,
Subzone A also has a link configured b etween it and Subzone B. This link us es a pipe with a
limit of 512kbps. In this situation, the lo wer limit of 128kbps will apply to ca lls between the two,
regardless of the larger capac ity of the pipe.
In the reverse situation, where S ubzone A has a per call inter bandwi dth limit of 512kbps and a
link to Subzone B with a pipe of 128, any calls b etween the two subzones will s till be limited to
128kbps.
Applying Bandwidth Limitations to Subzones
A non-traversal call bet ween two endpoints within t he same subzone would consume t he
amount of bandwidth of that call. A t raversal call between tw o endpoints within the same
subzone must, like any other travers al call, pass through the Traversal S ubzone. This
means that such calls will consume f rom the originating subzone’s total c oncurrent allocation
twice the bandwidth of the c all – once for the call from the subzo ne to the Traversal Subzone, and
again for the call from the Traversal Su bzone back to the originating s ubzone.
Calls passing through the Traversa l Subzone consume an amount of ban dwidth within the
subzone equal to that of the call.
TANDBERG VIDEO COMMUNICATION SERVER
ADMINISTRATOR GUIDE
Bandwidth Control