H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
363/22
H04Q 11/04 (2006.01) H04L 7/00 (2006.01)
Patent
CA 1274631
Abstract: A channel unit is disclosed for interfacing a digital subscriber line (DSL) to a PCM digital transmission facility, for example, T carrier. The basic rate interface (BRI) 2B+D format is converted to a unique three time slot format for transmission in the DS1 PCM signal format. The two communication B channels are interrogated to determine if they have a logical 0 in each bit position, i.e., a zero byte. If so, a non-all-logical 0 bit pattern is substituted and a logical 1 indication bit is inserted in an associated bit position in a control channel. In a receiver, the associated indicator bit positions in the control channel are interrogated to determine if an all logical 0 bit pattern, i.e., a zero byte, had been replaced. If so, an all logical 0 bit pattern is inserted in the associated communication channel. A logical 1 is inserted in a bit position 2 of the control channel to negate the possibility of emulating a T carrier yellow alarm condition. A logical 1 is also inserted in bit position 3 of the control channel to satisfy the logical 1's density requirement for digitial transmission facilities.
541468
American Telephone And Telegraph Company
Kirby Eades Gale Baker
LandOfFree
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