The T1 carrier originally carried 2

the t1 carrier originally carried 24 digital voice channels, each with a bit rate of 64 kbps.
Each tdm frame on the t1 line carried 24 bytes of voice data (8 bits per voice channel) plus a single framing bit to facilitate synchronisation and de-multiplexing by the receiver.
Since each byte of data represents a 125μs voice sample, the required frame rate was 8,000 frames per second.
the total bit rate for a t1 line is therefore 8,000 x ((24 x 8) 1) = 1,544,000 bits per second (1.544 mbps) and is designated as digital signalling level 1 or ds1.
The e-carrier system developed by the european conference of postal and telecommunications administrations (cept) benefitted from lessons learned during the development of the t-carrier technology,.refining and improving on the earlier system. like the ds0, the basic e0 voice channel has a bit rate of 64 kbps.
An e1 carrier, however, has a total of 32 timeslots per frame. each timeslot consists of only 8 bits (ie one timeslot per 8-bit channel), giving a total bit rate of 8,000 x 32 x 8 = 2,048,000 bits per second (2.048 mbps).
One timeslot (ts0) is reserved for framing,.while a second timeslot (ts16) may be used for signalling purposes (ie to control call setup and termination).

The T1 carrier originally carried 24 digital voice channels, each with a bit rate of 64 kbps.
Each TDM frame on the T1 line carried 24 bytes of voice data (8 bits per voice channel) plus a single framing bit to facilitate synchronisation and de-multiplexing by the receiver.
Since each byte of data represents a 125μs voice sample, the required frame rate was 8,000 frames per second.
The total bit rate for a T1 line is therefore 8,000 x ((24 x 8) 1) = 1,544,000 bits per second (1.544 Mbps) and is designated as digital signalling level 1 or DS1.
The E-carrier system developed by the European Conference of Postal and Telecommunications Administrations (CEPT) benefitted from lessons learned during the development of the T-carrier technology, refining and improving on the earlier system. Like the DS0, the basic E0 voice channel has a bit rate of 64 kbps.
An E1 carrier, however, has a total of 32 timeslots per frame. Each timeslot consists of only 8 bits (i.e. one timeslot per 8-bit channel), giving a total bit rate of 8,000 x 32 x 8 = 2,048,000 bits per second (2.048 Mbps).
One timeslot (TS0) is reserved for framing, while a second timeslot (TS16) may be used for signalling purposes (i.e. to control call setup and termination).

1 The T carrier originally carried 24 digital voice channels, each with a bit rate of 64 Kbps.
Each TDM T 1 frame on the line carried 24 bytes of Voice Data (8 bits per Voice channel) plus a single framing bit to facilitate synchronisation and de-multiplexing by the receiver.
Since each byte of data represents a 125 µs voice sample, the required frame rate was 8,000 frames per second.
The T total bit rate for a 1 line is therefore 8,000 x (24 X 8) 1) = 1,544,000 bits per second (1.544 Mbps) and is designated as Digital signalling level 1 or 1 DS.
The E-carrier system developed by the European Conference of Postal and Telecommunications Administrations (CEPT) benefitted from lessons learned during the development of the T-carrier technology,refining and improving on the earlier system.The Like DS 0, the basic E Voice channel 0 has a bit rate of 64 Kbps.
An E 1 carrier, however, has a total of 32 timeslots per frame. Each timeslot consists of only 8 bits (i. e. One timeslot per 8-bit channel), giving a total bit rate of 8,000 X 32 X 8 = 2,048,000 bits per second (2.048 Mbps) .
One timeslot (TS 0) is reserved for framing,while a second timeslot (TS16) may be used for signalling purposes (i. e. To control call setup and termination).