Panasonic KX-TDA0490, Getting Started

Page: 47 / 142

A1 VoIP Requirements
Getting Started 47
Via WAN (PPP: Point-to-Point Protocol)
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:
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 in 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 VoIP channels.
The 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.
CODEC
Packet Sending Interval
20 ms 30 ms 40 ms 60 ms 90 ms
G.711 84 kbps 77.3 kbps 74 kbps 70.7 kbps —
G.729A 28 kbps 21 kbps 18 kbps 14.7 kbps —
G.723.1 5.3 kbps — 18.7 kbps — 12 kbps 9.8 kbps
G.723.1 6.3 kbps — 19.7 kbps — 13.1 kbps 10.8 kbps
Required Bandwidth
= (2 × 87.2) + [(16 - 2) × 31.2]
= 611.2 (kbps)