TDM-to-packet conversion
Encyclopedia
TDM-to-packet conversion is the process of converting a digital signal in TDM
format (typically a 64 Kbit/second signal encoded with mu-law or A-law compression) into packets (typically RTP
packets) for carrying over a packet network such as the Internet
. This process is also known as the Jesus
Conversion.
The conversion process may include recoding with a different codec
, silence suppression, comfort noise generation and other tricks that can decrease the bandwidth requirement or improve the perceived voice quality of the result.
Note that this is a conversion of the signal, not a tunnelling, unlike TDM over IP
, which aims at transporting a TDM signal unchanged across an IP network.
See also Voice over IP
.
Time-division multiplexing
Time-division multiplexing is a type of digital multiplexing in which two or more bit streams or signals are transferred apparently simultaneously as sub-channels in one communication channel, but are physically taking turns on the channel. The time domain is divided into several recurrent...
format (typically a 64 Kbit/second signal encoded with mu-law or A-law compression) into packets (typically RTP
Real-time Transport Protocol
The Real-time Transport Protocol defines a standardized packet format for delivering audio and video over IP networks. RTP is used extensively in communication and entertainment systems that involve streaming media, such as telephony, video teleconference applications, television services and...
packets) for carrying over a packet network such as the Internet
Internet
The Internet is a global system of interconnected computer networks that use the standard Internet protocol suite to serve billions of users worldwide...
. This process is also known as the Jesus
Jesus
Jesus of Nazareth , commonly referred to as Jesus Christ or simply as Jesus or Christ, is the central figure of Christianity...
Conversion.
The conversion process may include recoding with a different codec
Codec
A codec is a device or computer program capable of encoding or decoding a digital data stream or signal. The word codec is a portmanteau of "compressor-decompressor" or, more commonly, "coder-decoder"...
, silence suppression, comfort noise generation and other tricks that can decrease the bandwidth requirement or improve the perceived voice quality of the result.
Note that this is a conversion of the signal, not a tunnelling, unlike TDM over IP
TDMoIP
In computer networking and telecommunications, TDM over IP is the emulation of time-division multiplexing over a packet switched network . TDM refers to a T1, E1, T3, or E3 signal, while the PSN is based either on IP or MPLS or on raw Ethernet...
, which aims at transporting a TDM signal unchanged across an IP network.
See also Voice over IP
Voice over IP
Voice over Internet Protocol is a family of technologies, methodologies, communication protocols, and transmission techniques for the delivery of voice communications and multimedia sessions over Internet Protocol networks, such as the Internet...
.