Multiplex communications – Wide area network – Packet switching
Patent
1992-03-19
1994-08-30
Safourek, Benedict V.
Multiplex communications
Wide area network
Packet switching
370 601, H04J 116, H04J 314
Patent
active
053434625
ABSTRACT:
A fault notifying system notifies a fault in an asynchronous transfer mode (ATM) network to at least one data terminating equipment (DTE). The fault notifying system includes a network interface coupled to the ATM network for outputting an alarm indication signal (AIS) when a fault is generated in the ATM network. An ATM crossconnect part generates an AIS cell having a predetermined signal format in response to the AIS. An adaptation layer processing part forms ATM cells, disassembles ATM cells and outputs a data circuit-terminating equipment not ready (DNR) in response to the AIS cell. A terminal interface coupled to the DTE notifies the fault in the ATM network to the DTE in response to the DNR. The AIS cell has a cell format identical to an ATM cell format but has predetermined information in a specific part of the ATM cell format to distinguish the AIS cell from the ATM cell.
REFERENCES:
patent: 5058104 (1991-10-01), Yonehara et al.
patent: 5101404 (1992-03-01), Kunimoto et al.
patent: 5130984 (1992-07-01), Cisneros
patent: 5132964 (1992-07-01), Esaki
Eda Susumu
Furuya Reiko
Hatta Hiroyuki
Hyodo Ryuji
Oomuro Katsumi
Fujitsu Limited
Patel Ajit
Safourek Benedict V.
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