ISDN Phone

ISDN stands for Integrated Service Digital Network, an international telephone communication protocol for sending data, voice, and video through digital telephone lines or normal telephone wires.
SV Tel is the leader in India of ISDN Phone manufacturer and supllier.

There are basically two types of ISDN:

1. BRI (Basic Rate Interface): BRI consist of two 64 kbps “B-channels” and one “D-channel” for transmitting control information.
2. PRI (Primary Rate Interface): PRI consist of 23 “B-channels” and one “D-channels” this configuration is available in USA and 30 “B-channels” and one “D-channel” this configuration available in Europe.

The original version of ISDN uses baseband transmission. Another version of ISDN, called B-ISDN, uses broadband transmission and is capable to support transmission rates of 1.5 Mbps. B-ISDN requires optical fiber cables and is not widely available.