Line concentrator

Details Line concentrator Line concentrator

1983-08-19

1986-07-15

Brown, Thomas W.

1791752C, 1791753F, H04Q 122, H04Q 360

Patent

active

046008136

ABSTRACT:
A concentrator for telecommunication lines uses a crosspoint matrix (100) incorporating semiconductor switches. A number of subscriber lines (1-14) are inputs to the matrix, and a smaller number of trunk lines are outputs. A subscriber loop detector is connected as a further input line and is connected successively to the input lines to scan them for a signalling loop. The detector and input lines are connected over a column of the matrix corresponding to a usable output line, and this column is varied. When all trunk lines are in use scanning ceases.

REFERENCES:
patent: 3740486 (1973-06-01), Freimanis
patent: 3903374 (1975-09-01), Pommerening et al.
patent: 4110566 (1978-08-01), Shanley
patent: 4150258 (1979-04-01), Fujimoto et al.
patent: 4258231 (1981-03-01), Lenz et al.
International Switching Symposium, Kyoto, Oct. 25th-29th, 1976, pp. 243-1-1-243-1-5; Tokyo, JP; Y. Suzuki et al: "A Line Concentrator Using Electronic Crosspoints", Pars. 3.3.3.5, FIGS. 3,6,7.
Patent Abstracts of Japan, vol. 2, No. 23, Feb. 15th, 1978, p. 11685E77 and JP-A-52 144 210 (Oki Denki Kogyo K.K.) 12-01-1977.

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