Panasonic KX-TDA0490 Getting Started page 47

Via WAN (PPP: Point-to-Point Protocol)
CODEC
G.711
G.729A
G.723.1 5.3 kbps
G.723.1 6.3 kbps
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 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.
Packet Sending Interval
20 ms 30 ms
84 kbps 77.3 kbps
28 kbps 21 kbps
— 18.7 kbps
— 19.7 kbps
A1 VoIP Requirements
40 ms 60 ms
74 kbps 70.7 kbps
18 kbps 14.7 kbps
— 12 kbps
— 13.1 kbps
90 ms
—
—
9.8 kbps
10.8 kbps
Getting Started 47