Synchronizing method for SDH systems as well as method of and ci

Details Synchronizing method for SDH systems as well as method of and ci Synchronizing method for SDH systems as well as method of and ci

1991-04-22

1993-10-05

Kuntz, Curtis

Pulse or digital communications

Spread spectrum

Direct sequence

375116, H04L 706

Patent

active

052512398

ABSTRACT:
A method is disclosed for synchronizing a system frame-structured in accordance with a digital synchronous hierarchy, particularly as specified in CCITT G.708. In a hunt mode, one frame sync word is detected, and then a first pointer (AU-4) is read which is spaced a predetermined distance from the sync word and addresses a cell-structured data area (VC4). Then the headers of the ATM cells in the data area, which are addressed via the pointer, are decoded, and if x successive correct cell headers are decoded, a transition to the sync state takes place. If data structures of an SDH system or a purely cell-structured transmission of ATM cells have to be identified, an incoming bit sequence is checked for a predetermined frame sync word (SDH frame) and then for code words representing regularly inserted cell headers, and a change to either a frame sync mode or a cell sync mode takes place.

REFERENCES:
patent: 5014272 (1991-05-01), Yoshida
patent: 5018140 (1991-05-01), Lee et al.
Choi, "Frame alignment in a digital carrier system--A tutorial", IEEE Comm. Mag. vol. 28, No. 2 (Feb. 1990) pp. 47-54.
Hac et al., "Synchronous Optical network and Braodband ISDN Protocols", Computer vol. 22, No. 11 (Nov. 1989), pp. 26-34.
"B-ISDN User Network Interface Physical Layer Specification", CCITT Recommendation I.432 (5 Apr. 1991), pp. 1-15.
H. Schneider, "Mit ATM zur bitratenvariablen Kommunikation", telecom report 13, 1990, H.1, pp. 4-7.
P. Schicker, "Datenubertragung und Rechnernetze", B. G. Teubner Stuttgart 1983, pp. 12-17.
A. Thomas, et al., "Asynchronous Time-Division Techniques . . . ", ISS '84 Florence, 7-11 May 1984, Session 32C, Paper 2, Paper 1-7.
S. Minzer, "Broadband ISDN and Asynchronous Transfer Mode (ATM)", IEEE Communications Magazine, Sep. 1989, pp. 17-24.

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