ISDN

ISDN ISDN- (Integrated Services Digital Network)- ISDN is a digital service offered by phone companies that runs on regular analog phone lines that can carry voice, data and other types of media traffic. Two types of ISDN interfaces are BRI (Basic Rate Interface) and PRI (Primary Rate Interface).

BRI- 2(64 Kbps) B Channels and 1 (16kbps) D Channel. PRI- 23(64Kbps) B Channels and 1(64Kbps) D Channel

ISDN vs Modem

ISDN has faster data rates than a modem connection, but it also has a faster call setup than a modem.

ISDN protocols E-series-ISDN on a existing network

I-series- ISDN concepts an terminology

Q-series- switching and signaling

ISDN Terminals TE1-terminals that plug directly into the ISDN network and can understand its standards

TE2-called nonnative analog is older than ISDN standards

NT1-implements physical layer standards, and connects user devices to the network

NT2-providers equipment, (switch)

TA-terminal adapter converts TE2 to TE1 wiring that connects into a NT1 device._

Reference Points

R-Defines the reference point between non ISDN and terminal adapter.

S- Defines the reference point between user terminals and NT2.

T- Defines the reference point between NT1 and NT2 devices.

U- Defines the reference point between NT1 devices and line-termination equipment.