Multiplex communications – Wide area network – Packet switching
Patent
1994-12-20
1996-06-04
Kizou, Hassan
Multiplex communications
Wide area network
Packet switching
370 582, 370 851, H04J 312
Patent
active
055240100
ABSTRACT:
A communication system (1) operating according to the ISDN standard comprises a network terminal unit (2) to which ISDN terminals (TE1 . . . TEn) can be connected via a bus (4). The network terminal unit (2) and the terminals (TE1 . . . TEn) communicate with each other over an ISDN S-interface (S.sub.0). The network terminal unit (2) itself provides setting up a local communication between two terminals (TE1, TE2) connected to the bus (4). As a result, further elements in the communication system (1), such as the central control unit (3), are not loaded with this. If a local communication is to be set up, the calling terminal (TE1) is to insert an indicator (LC) in the first message (SET UP) to be sent, on the basis of which indicator the routing means set up transparently the local communication to a called terminal (TE2) connected to the bus (4). All further messages (msg) sent via the D-channel between the calling terminal (TE1) and a called terminal (TE2) are rerouted to the bus (4) via the D-channel, because they have a call reference (call ref) which is the same as the call reference (call ref) in the SET UP message (SET UP). As a result, the network terminal unit (2) knows that these messages (msg) belong to the local communication. The two terminals (TE1, TE2) can send these messages in the same manner as in a standard ISDN communication system.
REFERENCES:
patent: 4722082 (1988-01-01), Furuya et al.
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patent: 4999386 (1991-03-01), Fujiwara
patent: 5185741 (1993-02-01), Iguchi et al.
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CCITT Recommendation I.430.
CCITT Recommendation Q.921.
Balconi-Lamica Michael J.
Barschall Anne E.
Kizou Hassan
Rao Seema S.
U.S. Philips Corporation
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