bud@uunet.uu.net> (05/04/91)
In article <telecom11.323.5@eecs.nwu.edu> nanook@eskimo.celestial.com (Robert Dinse) writes: > used in this country. The normal T1-cxr uses 64kb/s (8 bits times 8 > Khz sample). >> 20 phone calls take 1 Mb/s (actually, T1 line at 1 Mb/s handles 32 > The standard T1 rate is 1.544 Mbits/sec and carries 24 not 32 > channels. I think that the confusion lies in the difference between US (and Japan) *T1* rates and the CEPT (European *E1* standards. Both use a channel rate of 64 Kb, but not the same frame, signaling, or channel structure. T1 uses 24 channels of 8 bits, whereas the CEPT systems have 32 channels of 8 bits. Only 30 of those are used for end-to-end transmission, the remaining two channels are for signaling, framing and maintenence. The E1 line rate is 2.048 Mb/s. T1 has an extra bit assigned for framing, etc, and may steal an lsb from each channel for signaling every sixth frame. Bud Couch - ADC/Kentrox If my employer only knew ... standard BS applies