Synchronizing method for sdh systems as well as method of...

Details Synchronizing method for sdh systems as well as method of... Synchronizing method for sdh systems as well as method of...

H - Electricity

04

L

340/80

H04L 7/00 (2006.01) H04J 3/06 (2006.01) H04L 12/56 (2006.01) H04L 7/04 (2006.01)

Patent

CA 2040085

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 ATH 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.

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