Nec Corporation

Masato Aoyagi

Tomoyoshi Shimizu

Tsutomu Okurano

Haruhiko Yamamura

Multiple connections of subscriber access systems are controlled by means of V5 interfaces in a switched system accommodating interface prescribed by V5 protocol according to ETSI standards by using one B-channel as communication channel C with an access network that accommodates subscribers of another network service provider apart from communication channel C prescribed by normal V5 protocol between the local exchange and an access network operated by the service provider of the local exchange when connecting access networks accommodating subscribers of another network service providers to an access network operated by the service provider of the local exchange.

Multiple connection method and device for subscriber access network

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

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Tokyo, Japan

Masato Aoyagi