Patent Number: 6,298,040

Title: Data link layer processor system for a local exchange system

Abstract: A data link layer processing (DLLP) system comprises a plurality ofin-service DLLPs and a plurality of spare DLLPs. The switching between thein-service DLLP and the spare DLLP is effected by coupling both the DLLPswith the transmission line and transferring logical links from thein-service DLLP to the spare DLLP one by one while frame multiplexing thedata from the spare DLLP with the data from the in-service DLLP. After allof the logical links are transferred, a switch decouples the in-serviceDLLP to leave the spare DLLP coupled with the transmission line for anormal operation.

Inventors: Aoyagi; Masato (Tokyo, JP), Shimizu; Tomoyoshi (Tokyo, JP), Yamamura; Haruhiko (Tokyo, JP), Okurano; Tsutomu (Miyagi, JP)

Assignee:

International Classification:

Expiration Date: 10/02/2013