Optimizing Your Lan For Voip; The Broadband Connection; The Router - Talkswitch CT.TS005.003902 User Manual

OPTIMIZING YOUR LAN FOR VOIP

The broadband connection

Figure 19: Broadband
Modem
Internet or
Private IP
Network
xDSL
Cable
Satellite
etc.
For optimal quality of VoIP calls on your system, we recommend that you
subscribe to a high-speed broadband connection from your service provider.
'Lite' broadband is not suitable for simultaneous voice and data traffic. 'Lite'
broadband typically runs 128 Kbps downstream and 64 Kbps upstream. The
limiting factor for a broadband connection is the upstream bandwidth to the
Internet Service Provider (ISP).
Example: If you have a 1 Mbps ADSL connection from your service provider,
it likely means you have an upstream bandwidth of approximately 380 Kbps.
Keep in mind that not the full 380 Kbps are available at all times. You can
estimate about half of the upstream bandwidth as being available. In this
case, you could safely support two simultaneous G.711 calls (100 Kbps/calls)
or four simultaneous G.726 calls (50 Kbps/calls) or 10 simultaneous G.729
calls without factoring in other data traffic on the network at the same time.
With additional traffic on the Internet or private IP network, the number of
simultaneous calls supported is reduced.
G.711, G.726 and G.729 are VoIP codecs. For more information on codecs, see
VoIP Configuration on page 194.

The router

Figure 20: Router
Modem
Router/NAT
xDSL
Cable
Satellite
etc.
1 8 6
Internet or
Private IP
Network
V O I P I N F O R M A T I O N