Yellow alarm control in DS1 SF and DS1 ESF transcoding

Details Yellow alarm control in DS1 SF and DS1 ESF transcoding Yellow alarm control in DS1 SF and DS1 ESF transcoding

1990-03-09

1991-11-05

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

3701051, H04J 312

Patent

active

050635646

ABSTRACT:
In D4 channel banks operating in a DS1 Extended Super Frame (ESF) mode, it is possible for inband yellow alarm bits to corrupt data in applications involving unrestricted use of dataport type channel banks including 64 kilobit clear channel capability. A problem also exists in that the data being received in the ESF framing mode could enulate an inband yellow alarm condition, and cause alarm units in a receiving channel bank to declare a "false" yellow alarm condition. The inband yellow alarm problems are eliminated by inhibiting yellow alarm bits from being inserted into the frames of a DS1 Super Frame format during operation in the ESF framing mode, and by ignoring any possible inband yellow alarm bits being received during operation in the ESF framing mode.

REFERENCES:
patent: 4191857 (1980-03-01), McLaughlin et al.
patent: 4397020 (1983-08-01), Howson
patent: 4757499 (1988-07-01), Gorshe
patent: 4787084 (1988-11-01), Piercy
The Bell System Technical Journal, Nov. 1982, vol. 61, No. 9, Part 3.
AT&T Technical Advisory No. 70, Issue 2 "The Extended Framing Format Interface Specifications", Sep. 29, 1981.

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