Maintenance communication control system in an ISDN service
AssigneeFujitsu Limited
InventorsSumie Morita, Takashi Hatano, Ryouzi Takano, Hisashi Koga, Tsutomu Shiomitsu
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Abstract
A maintenance link is established according to a LAPD between first and second terminal units on a path through which subscribers' packet information is transmitted. In the first and second terminal units, first and second communication state control units are provided for controlling the consistency of the communication state between the two terminal units by sending/receiving communication state control information using the maintenance link.
Claims6
A maintenance communication control system in integrated service digital network, ISDN, services for terminating subscriber's call control information and packet information transmitted using a D channel of an ISDN after being distributed separately to a first terminal unit and a second terminal unit, comprising:
- said first terminal unit for terminating the subscriber's call control information;
- said second terminal unit for terminating the subscriber's packet information;
- a maintenance link provided between said first and second terminal units;
- and
- first and second communication state control means for controlling the consistency of the communication state between said first and second terminal units by sending/receiving information on terminal end point identifiers of a line link using a B channel and a packet link using said D channel, using said maintenance link, said first and second communication state control means respectively provided in said first and second terminal units.
Dependencies are inferred from the claim text.