iOS Transmission

Both modes of voice transmission has its own advantages and disadvantages. For example TDM transmission works on circuit switched mode. If you take a telephone call on a ordinary phone a 64 Kbps is allocated for the entire length of your conversation which makes the quality of voice extremely good.... but we would not be able to make use of the bandwidth allocated for that circuit even if there is lot of idle time during the conversation. Whereas, in case of IP transmission as packets are switched, as long as you are having control over the bandwidth, usage can be optimised giving optimal quality based on our specs. But the key term here is control, if you do not have control over the bandwidth allocation and ratio of concurrent voice channels transmission, then voice quality can suffer if the traffic exceeds the limitation. This is again factored based on the compression equipment in place.

 

Any traffic on a TDM circuit can be itransmission considered travelling over a clear channel relating to the ordinary telephone call example mentioned earlier.

 

Other differences are TDM is a secure channel, but IP bandwidth if it is on Public Internet can't be termed fully "secure". However with the advent of MPLS technology, IP transmission has gained more predominance as packets getting switched has enabled security. Apart from this QoS is possible on MPLS networks and thereby applying CoS on the bandwidth allocate can prioritize voice and data traffic according your specs. (Your MPLS may have a T1 or DS3 bandwidth backbone)