3 ms·
Just fyi, POTS is digital up until the very last mile. While the network is digital, it uses time multiplexed serial PCM streams under the hood. Aside from the
by doctorshady 10y ago
Just fyi, POTS is digital up until the very last mile. While the network is digital, it uses time multiplexed serial PCM streams under the hood. Aside from the delay imposed by fiber transmission at the trunk level (~40 milliseconds from one side of the US to the next. If you're using a long distance network that packetizes the connection or sends a call on some weird route, that can certainly increase), the g.711 encoding delay should be fixed at 0.125 milliseconds.
- l1ambda 10y agoInteresting. I didn't know g.711 was so low. Typical VOIP latency must then stem from D/A and A/D conversion and internet latency.
- makomk 10y agog.711 has such low latency because it doesn't take advantage of inter-sample redundancy in any way whatsoever - it's just raw 8-bit samples at 8 ksps with a compander on either end (traditionally on the analog side of the DAC and ADC).