A European framing specification for the transmission of 32 DS0 (64 kb/s) data streams. By extension, it can also denote the transmission rate required (2.048 Mb/s = 2048 kb/s). Unlike DS1? it is free of BitRobbing.
The E1 channel is divided into 32 /timeslots/. The first, Timeslot Zero is used for syncronisation between endpoints, and the sixteenth (Timeslot 15) is usually used for signalling information, leaving 30 free DS0 channels.
2 pages link to E1:
