In an apparatus and a method for interfacing a private exchange to an ISDN, the apparatus controls intralayer and interlayer entity communications to interface the private exchange to the ISDN. The apparatus is disposed in a universal card slot of a subscriber shelf of the private exchange in the form...http://www.google.fr/patents/US6009093?utm_source=gb-gplus-shareBrevet US6009093 - Apparatus and method for interfacing private exchange to integrated services digital network
Apparatus and method for interfacing private exchange to integrated services ...
