8.2.3 Bandwidth Assessment
Therefore, inform your network administrator and make sure that the network can support a bandwidth of
611.2 kbps even when the network is under conditions of maximum traffic.
It is recommended that all cards on a VoIP network have the same packet sending interval.
As described above, it is possible to control the required bandwidth by selecting a certain combination of codec
and packet sending interval. However, it is also possible to control required bandwidth by limiting the number
of available virtual VoIP channels.
The V-IPGW16 card supports a total of 8 ports, each having 2 separate channels. By disabling some of the
ports, you can reduce the bandwidth required for VoIP communications.
To limit the number of VoIP channels:
Set the status of the ports you wish to disable (starting from the highest-numbered port) to OUS.
For example, if you wish to use only 10 of the available 16 virtual VoIP channels (i.e., disable 6 channels), set
ports 8, 7, and 6 to OUS as shown below:
In this case, the equation for bandwidth calculation, based on the previous example, will change as follows:
= (No. of Fax Machines ´ Required Bandwidth for the G.711 codec) +
[(10 - No. of Fax Machines) ´ Required Bandwidth for Voice Communication]
= (2 ´ 87.2) + [(10 - 2) ´ 31.2]
= 424 (kbps)