Boots – shoes – and leggings
Patent
1982-08-30
1985-04-16
Shaw, Gareth D.
Boots, shoes, and leggings
G06F 304
Patent
active
045119635
ABSTRACT:
Substitution of a general purpose data processing system for special purpose magnetic tape recording equipment, in certain existing network environments--one example being present telephone call billing networks--offers advantages in respect to equipment costs and data handling efficiency, but requires presently disclosed adaptation for effecting the substitution efficiently and with complete transparency to unaltered parts of the environmental (host) network. While simulating a data recording operation the substituted system receives an arbitrary length train of data bytes clocked at a first rate followed by a cyclic redundancy check (CRC) byte timed at a slower second rate. In order to maintain network transparency, the substituted system must retransmit the data and CRC check bytes, in their received order and at their respective reception rates, after a delay associated with the physical separation between recording and reproducing heads in the "native" tape recording equipment. The system also must generate and transmit an LRC (longitudinal redundancy check) character following the CRC byte. Such "echo" (verification) transmissions are effected by disclosed means which determine the instant of real time at which the substituted system has completed its retransmission of the last data byte and switch an internal echo transmission timing reference from a source associated with data byte retransmissions to one associated with CRC and LRC transmissions. Other disclosed means operates to generate an LRC character--which in the native tape equipment is formed directly by the action of resetting magnetization levels in bit track recording heads operating in NRZI mode--and to cause delayed transmission of that character immediately following the echoed CRC character.
REFERENCES:
patent: 4207687 (1980-06-01), Haas et al.
patent: 4280193 (1981-07-01), Baun et al.
International Business Machines Corp.
Lee Jameson
Lieber Robert
Shaw Gareth D.
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