Title:
FCG TEST SYSTEM FOR LOCAL TANDEM SWITCH
Document Type and Number:
Japanese Patent JPS5553957
Kind Code:
A
Abstract:
PURPOSE: To realize the false cross and ground test for the network exclusive for the local tandem by putting the false cross and ground test circuit into the connection bus between the incoming and outgoing trunks.
CONSTITUTION: When a call is given to incoming trunk ICT from other station, outgoing trunk OGT of the desired line is selected with closure of 1st∼4th switches PSW(α)∼JSSW(α) plus PSW(β)∼JSSW(β) in order to form the bus. After this, 1st switches PSW(α) and PSW(β) are opened, and then 1st∼3rd switches PSW (α)∼JPSW(β) are closed to the rest 4th swtich JSSW(β). And the interruption control is given with 4th switch JSSW(β). In this way, false cross and ground test circuit FCGT can be put into the bus.
Inventors:
OGAWA YOUICHI
MUGITANI SHIGERU
FURUHASHI TOORU
KAWATANI IKUO
INOUE SABUROU
MUGITANI SHIGERU
FURUHASHI TOORU
KAWATANI IKUO
INOUE SABUROU
Application Number:
JP12739678A
Publication Date:
April 19, 1980
Filing Date:
October 18, 1978
Export Citation:
Assignee:
HITACHI LTD
NIPPON TELEGRAPH & TELEPHONE
OKI ELECTRIC IND CO LTD
NIPPON ELECTRIC CO
FUJITSU LTD
NIPPON TELEGRAPH & TELEPHONE
OKI ELECTRIC IND CO LTD
NIPPON ELECTRIC CO
FUJITSU LTD
International Classes:
H04M3/26; H04Q1/20; (IPC1-7): H04M3/24