ISDN subscriber accommodating and accessing systems

Abstract

Disclosed is a ISDN subscriber accommodating and accessing system having: subscriber side controlling means for accommodating plurality of ISDN subscribers, which is provided with a frame relay function which is defined by a link access protocol (LAP) and a partial terminating function; access network (AN) side controlling means having a frame relay function which is defined by the LAP and a function for terminating an interface line; and local exchange device (LE) side terminal means having a function to terminate a frame of the LAP via the interface line; wherein the ISDN subscriber accommodating and accessing system limits the number of frame relays for confirming a link to be intercommunicated between the respective means.

Dependencies are inferred from the claim text.