Additional Information - Panasonic KX-TDE100 Network Manual

Via LAN
Codec
G.711
G.729A
Via WAN (PPP: Point-to-Point Protocol)
Codec
G.711
G.729A
Bandwidth Calculation
Provided below is the formula to find out the amount of bandwidth required for VoIP communications:
Required Bandwidth
= (No. of Fax Machines ´ Required Bandwidth for the G.711 codec) +
[(16 - No. of Fax Machines) ´ Required Bandwidth for Voice Communication]
Example
Consider the following case as an example:
•
Communication: via LAN
•
No. of Fax Machines: 2
•
G.711 Packet Sending Interval: 20 ms (requiring 87.2 kbps per channel)
•
G.729A Packet Sending Interval for Voice Communication: 20 ms (requiring 31.2 kbps per channel)
In this case, the required bandwidth will be as follows:
Required Bandwidth
= (2 ´ 87.2) + [(16 - 2) ´ 31.2]
= 611.2 (kbps)
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.
Note
It is recommended that all cards on a VoIP network have the same packet sending interval.

Additional Information

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.
20 ms 30 ms
87.2 kbps 79.5 kbps
31.2 kbps 23.5 kbps
20 ms 30 ms
84 kbps 77.3 kbps
28 kbps 21 kbps
Packet Sending Interval
40 ms
75.6 kbps 71.7 kbps
19.6 kbps 15.7 kbps
Packet Sending Interval
40 ms
74 kbps 70.7 kbps
18 kbps 14.7 kbps
2.1.1 Bandwidth Assessment
60 ms 90 ms
—
—
60 ms 90 ms
—
—
IP Networking Guide 15