Generally used in Europe, a wide-area digital transmission scheme carrying data at 2.048 Mbps. E1 transmission lines are available for lease from common carriers for private use.


(1) Evolved from standard telephone numbering system, the standard recommended by ITU-T for international telecommunication numbering, particularly in ISDN, SMDS, and BISDN. (2) Label of field in an ATM address containing numbers in E.164 format.


External border gateway protocol: Used to exchange route information between different autonomous systems.

E channel

Echo channel: A 64 Kbps ISDN control channel used for circuit switching. Specific description of this channel can be found in the 1984 ITU-T ISDN specification, but it was dropped from ...

Get Cisco® Network Professional's: Advanced Internetworking Guide now with the O’Reilly learning platform.

O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.