LAN-to-LAN communication method, and LAN-to-LAN connecting unit

Details LAN-to-LAN communication method, and LAN-to-LAN connecting unit LAN-to-LAN communication method, and LAN-to-LAN connecting unit

1994-09-02

1996-08-20

Chin, Wellington

Multiplex communications

Wide area network

Packet switching

370 16, 370 8513, 34082508, H04J 314

Patent

active

055485782

ABSTRACT:
A LAN-to-LAN connecting unit sends a node-status confirmation packet PKTC to LAN terminals under its command to confirm the status of each terminal. Upon receiving the confirmation packet, a normal terminal sends a response packet PKTR back to the LAN-to-LAN connecting unit. However, a LAN terminal incapable of receiving data because of a pulled cable or some other problem cannot send back the response packet. The LAN-to-LAN connecting unit identifies and stores information indicating whether a LAN terminal is capable or incapable of reception depending upon whether the response packet is received. In a case where an incoming call has been terminated at a prescribed LAN terminal and this terminal is capable of reception, the LAN-to-LAN connecting unit receives the data sent from the other party's LAN terminal and transmits this data to the LAN. In a case where the prescribed LAN terminal is incapable of reception, the connecting unit disconnects the line immediately. If a transfer destination has been registered to correspond to a terminal that is incapable of reception, received data is transferred to the transfer destination.

REFERENCES:
patent: 5079765 (1992-01-01), Nakamura
patent: 5301273 (1994-04-01), Konishi
patent: 5329527 (1994-07-01), Ujihashi et al.

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