ISDN Overview
In North America, the ISDN enhancement of Switched 56 is achieved through
two sets of protocols:
-
Signaling System 7 (SS7). Unlike protocols used by Switched 56, SS7 is
an out-of-band protocol, which means that signaling information travels
on a separate network parallel to the data.
-
Basic Rate Interface and Primary Rate Interface Protocols. These define
the connections between the user and the network.
These protocols are defined in CCITT standards and are based around the
OSI model for layers 1 to 3. Error recovery and other procedures are handled
by customer equipment. ISDN protocols allow users to utilize the same digital
lines for:
-
Dial-up voice calls
-
Dial-up 64Kbps digital connections
In addition, ISDN standards define such things as:
-
Physical connector used to connect Terminals to the ISDN network
-
Caller Identification (Caller ID)
-
User-to-User signaling
-
Call Forwarding
-
Direct Inward Dialing (DID)
-
Sub addressing
Last modified on May 12, 1996
Your Web Page Creator for this page is P. Allen Jensen.