PR Log - Apr 27, 2012 - ISDN stands for Integrated Service Digital Network. It’s used for sending voice, video and data over telephone wires – digitally.
With ISDN, you get a high-performance service, with almost instant connection, crystal clear voice quality and fast data transfer at a rate up to 128 Kbps (128,000 bits per second) compared with only 56 Kbps for analogue.
When you use ISDN, you can send and receive calls to all telephone subscribers, whether they use analogue or digital equipment.
To use the traditional copper phone lines for your ISDN service, you need to be within about 3.4 miles or 5.5. kilometers of the local exchange. If your building is further away, ISDN may require repeater devices or fibre optic cables to be installed.
Depending on the number of phone lines you have, you’ll need ISDN2 or ISDN30.
ISDN2 (also known as Basic Rate Interface or BRI)
ISDN2 is ideal for offices with 2-10 phone lines where you can attach up to 10 digital devices.
Each ISDN2 line carries a pair of channels, one line costs about the same as two analogue phone lines.
ISDN30 (also known as Primary Rate Interface or PRI)
ISDN30 suits offices with more than 8 phone lines, and wide-area networks (WANs) linking two or more offices.
Each ISDN30 connection provides between 8 and 30 independent channels, which can be combined if you want to do anything that uses a lot of bandwidth such as high-quality video conferencing or transferring large data files.
Before ISDN, voice calls and dial-up modems used analogue signals that had time lag, line noise and distorted quality. You couldn’t use the phone or fax at the same time as being online.
This article was submitted by Neil Barrall - Managing Director at Telecoms World PLC. Neil is an
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