Multiplex communications – Wide area network – Packet switching
Patent
1980-02-04
1982-02-23
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 58, H04Q 1104
Patent
active
043171931
ABSTRACT:
A switching network containing a plurality of nodal crosspoint configurations (NCCs) through which connection paths may be established to link together a plurality of different pairs of calling and called terminating circuits is disclosed. This space division nodal network is reconfigured on each of a plurality of repetitive time slots so that the same crosspoint of a given NCC (except the crosspoints associated with the nodes's terminating circuits) may serve a different call on each time slot. Four wire paths are provided, however, to each terminating circuit by assigning separate "going" and "return" time slots to each direction of transmission. A usage count is accrued showing how many independent calls are contained in the network on each time slot. When a path for a new call is to be established, the least busy time slot is selected, and then a link path to connect calling and called terminating circuits is chosen using the least busy intervening NCCs lying in the most direct available path.
REFERENCES:
patent: 3729593 (1973-04-01), Altenburger et al.
patent: 3906175 (1975-09-01), Joel
patent: 3916124 (1975-10-01), Joel
patent: 4022982 (1977-05-01), Hemdal
patent: 4038497 (1977-07-01), Collins et al.
patent: 4198546 (1980-04-01), Schlichte
"Nodal Switching Networks", Article No. 312, by A. E. Joel, Swedish 7th International Teletraffic Congress; Jun. 13-20, 1973.
Bell Telephone Laboratories Incorporated
Olms Douglas W.
Popper H. R.
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