System for connecting ISDN tie line via ISDN office line
AssigneeFujitsu Limited
InventorsTomio Tabata, Tomonori Matoba
Life of this patent
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Abstract
An ISDN tie line connecting system connects an ISDN tie line between two private branch exchanges via an ISDN office line using an ISDN primary rate interface. The ISDN tie line connecting system includes a tie line interface, a provisional interface for connecting an office line interface, and an interface loop-back part which is coupled to each private branch exchange. The interface loop-back part carries out a conversion between the tie line interface and the provisional interface with respect to the ISDN primary rate interface.
Claims8
An ISDN tie line connecting system which connects an ISDN tie line between two private branch exchanges via an ISDN office line using an ISDN primary rate interface, said ISDN tie line connecting system comprising:
- a tie line interface connected between the ISDN tie line and each private branch exchange;
- a provisional interface connected between the ISDN office line and each private branch exchange;
- an interface loop-back part, coupled to each private branch exchange, for carrying out a conversion between the tie line interface and the provisional interface with respect to the ISDN primary rate interface, by looping back at least the tie line interface.
Dependencies are inferred from the claim text.