Three time slot digital subscriber line termination

Details Three time slot digital subscriber line termination Three time slot digital subscriber line termination

1986-08-20

1989-01-17

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370100, H04Q 1104, H04J 306

Patent

active

047992174

ABSTRACT:
A channel unit is disclosed for interfacing a digital subscriber line (DS1) 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 DSl PCM signal format. The two communication B channels are interrogated to determine if they have a logical 0 in each bit position, i.e., 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 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 digital transmission facilities.

REFERENCES:
patent: 3502810 (1970-03-01), Aaron et al.
patent: 4587514 (1986-05-01), Schas et al.
patent: 4747098 (1988-05-01), Huang et al.
patent: 4757501 (1988-07-01), Gorshe

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