Switching system reliability

Details Switching system reliability Switching system reliability

1989-05-24

1990-12-18

Dwyer, James L.

Multiplex communications

Wide area network

Packet switching

379269, 379279, 379273, H04M 714

Patent

active

049791648

ABSTRACT:
The switch units of a distributed switching system are connected by a central switch for advancing connections between the switch units and also by inter-switch unit trunks. To save switch unit resources, trunk services such as scanning and signaling are not provided to the inter-switch unit trunks while the central switch is available for advancing connections. When the central switch becomes unavailable for advancing connections, as detected by control units in the switch units, the inter-switch unit trunks are connected to the trunk serving circuitry of the switch units and connections are advanced between switch units over the inter-switch unit trunks. Serving the inter-switch units trunks while the central switch is unavailable requires additional switch unit resources but provides for continuity of service which would to otherwise be lost due to the unavailability of the central switch.

REFERENCES:
patent: 3217109 (1965-11-01), Abert
patent: 4583218 (1986-04-01), Ardon et al.
G. Zorpette, "Keeping the Phone Lines Open", IEEE Spectrum, vol. 26, No. 6, Jun. 1989, pp. 32-36.

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