ATM cell format conversion system

Details ATM cell format conversion system ATM cell format conversion system

1991-07-26

1994-08-23

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 941, 370 942, H04J 300

Patent

active

053413768

ABSTRACT:
An ATM (Asynchronous Transfer Mode) cell format conversion system writes in a memory a plurality of ATM cells each being 53 octets long and mapped in the payload fields of virtual containers VC-4-NC which have been multiplexed in the form of STM-N frames and have been extracted from said frames. A 1 octet-long cell overhead is added to each of the ATM cells read out of the memory in response to base frame pulses which are synchronous with the STM-N frames, whereby the ATM cells are converted to 1-octet-added ATM cells each being 54 octets long. The 1-octet-added ATM cells and an idle cell are mapped in an imaginary matrix 5 column groups.times.9 rows frame by frame and then outputted. This allows each of the STM-N frames or be switched to otherwise processed on an ATM cell basis.

REFERENCES:
patent: 5030951 (1991-07-01), Eda et al.
patent: 5103447 (1992-04-01), Takiyasu et al.
A. Thomas, J. P. Coudreuse and M. Servel, "Asynchronous Time-Division Techniques": An Experimental Packet Network Integrating Videocommunication :, ISS '84 (May 1984).
H. Suzuki, H. Nagano, T. Suzuki, T. Takeuchi and S. Iwasaki, "Output-buffer Switch Architecture for Asynchronous Transfer Mode:", ICC '89 (Jun. 1989).
CCITT "Study Group XVIII--Report R-33 (COM XVIII-R 33-E" published in Jun. 1990.
IEEE Communications Magazine, vol. 29, No. 3; Mar. 1989; US pp. 8-15; Ballart et al., "Sonet: Now It's the Standard Optical Network".
Philips Telecommunications and Data Systems Review. vol. 48, No. 2, Jun. 1990, Hilversum NL pp. 15-22; W. Kricj "ATM-A Transfer Concept Not Only for Broadband Services".

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