Multiplex communications – Wide area network – Packet switching
Patent
1990-11-06
1994-07-19
Chin, Stephen
Multiplex communications
Wide area network
Packet switching
3701051, 375118, H04J 306
Patent
active
053316398
ABSTRACT:
A method and an apparatus for converting a frame phase of a signal having a frame structure specified in the CCITT recommendations which contains N (N: an integer 2 or above) pieces of frames applied with time-division/multiplex, in which the N pieces of frames are given to N pieces of memories, respectively, a write address is given independently to each memory so that the N pieces of frames are written in the respective memories in a same phase as the phase in the signal, a read address is given independently to each memory so that the N pieces of frames are read out of the respective memories in a same phase as the write phase, a difference between a write address and a read address in each memory is set identical under an initial state, and justification is executed for a frame which is read out of the memory in accordance with a difference between existing write address and read address in each memory, whereby to perform frame phase conversion while maintaining relative phase among respective frames.
REFERENCES:
patent: 4535446 (1985-08-01), Mountain
patent: 4941141 (1990-07-01), Hayano
patent: 5128939 (1992-07-01), Takatori et al.
NTT Research and Development Report, vol. 28, No. 7, 1987, pp. 210-214.
IX the Plenary Assembly-Document 142 Study Group XVIII-Report R57 (pp. 99-107).
Ashi Yoshihiro
Ishida Keiichi
Kanno Tadayuki
Mori Takashi
Nakano Yukio
Chin Stephen
Ghebretinsae T.
Hitachi , Ltd.
Nippon Telegraph and Telephone Corp.
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