Differences between current version and previous revision of IntegratedServicesDigitalNetwork.
Other diffs: Previous Major Revision, Previous Author, or view the Annotated Edit History
| Newer page: | version 2 | Last edited on Friday, November 28, 2003 3:01:54 pm | by AristotlePagaltzis | |
| Older page: | version 1 | Last edited on Sunday, August 24, 2003 10:24:10 pm | by CraigMckenna | Revert |
@@ -1,7 +1,7 @@
([ISDN]) A set of communications standards allowing a single wire or optical fibre to carry voice, digital network services and video. [ISDN] is intended to eventually replace the plain old telephone system.
-[ISDN] was first published as one of the 1984 ITU-T Red Book recommendations. The 1988 Blue Book recommendations added many new features. [ISDN] uses mostly existing PublicSwitchedTelephoneNetwork ([PSTN])
switches and wiring, upgraded so that the basic "call" is a 64 kilobits per second, all-digital end-to-end channel. Packet and frame modes are also provided in some places.
+[ISDN] was first published as one of the 1984 ITU-T Red Book recommendations. The 1988 Blue Book recommendations added many new features. [ISDN] uses mostly existing PublicSwitchedTelephoneNetwork switches and wiring, upgraded so that the basic "call" is a 64 kilobits per second, all-digital end-to-end channel. Packet and frame modes are also provided in some places.
There are different kinds of [ISDN] connection of varying bandwidth (see DS level):
DS0 = 1 channel PCM at 64 kbps
