AAL-5 SSCS for AAL-1 and AAL-2 in ATM networks

Details AAL-5 SSCS for AAL-1 and AAL-2 in ATM networks AAL-5 SSCS for AAL-1 and AAL-2 in ATM networks

1997-09-19

2000-08-22

Kizou, Hassan

Multiplex communications

Pathfinding or routing

Switching a message which includes an address header

370469, 370474, 714 52, 371 53, H04L 1228, H04L 1256

Patent

active

061083364

ABSTRACT:
The present invention uses the SAR and CPCS functions of the AAL-5 to define an AAL-5 SSCS for performing the AAL-1 and AAL2 functions. The defined AAL-5 format comprises a SSCS trailer of N (preferred value is 8) bytes an CPCS-PDU of N+8 (preferred value is 16) cells (16.times.48 bytes=768 bytes). In the preferred embodiment, the AAL-5 CPCS-PDU is transported inside 16 ATM cells. The CPCS and SSCS trailers provide the the same efficiency as AAL-1 and the global structure based on 16 cells is completely similar and transparent in term of delay and overhead. The payload size is 48 bytes for the 15 first cells, and 32 bytes for the last cell. The CPCS-PDU payload size is always a multiple of 8 bytes.

REFERENCES:
patent: 5619499 (1997-04-01), Nakabayashi
patent: 5742765 (1998-04-01), Wong et al.
patent: 5870394 (1999-02-01), Oprea
W. Stallings, ISDN and Broadband ISDN with Frame Relay and ATM, p. 113, pp. 478-489, 1995.

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