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Consider transmission of voice over the internet using the following settings/protocols:

- VoIP codec used: G.711 (64,000 bps). Sent inside RTP packets, with the shortest possible 12-byte headers.

- Voice frames are transmitted every 10 ms using a UDP transport-layer protocol, with8 -byte headers.

- UDP datagrams are then sent using IPv4 (20-byte headers)

- Finally, IPv4 packets are transmitted using Ethernet frames (38 bytes used by headers and trailer structures).

What is the maximum overall efficiency of such a setup? I.e., what percentage of the transmitted Ethernet frames is going to be comprised of the actual voice data, as opposed to the various overhead information? Show your calculation.

How does the efficiency change if the data is sent every 20 ms instead of every 10 ms?

How does the efficiency change if the codec is replaced with G.729 Annex A (8,000 bps), using the same 10 ms-long frames?

Sagot :

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