Title:
TELEPHONE EXCHANGE SYSTEM
Document Type and Number:
Japanese Patent JP3045587
Kind Code:
B2
Abstract:
PURPOSE: To permit a trunk line call and to manage a talking charge on individual basis by connecting a telephone set and an exchange by an analog 2-wire system so as to simplify the exchange.
CONSTITUTION: A controller 109, a magnetic card reader 110 and a shunt regulator 135 supplying a power supply whose voltage is constant to a logic circuit section including their peripheral circuits are arranged to a post-stage of a handset and a speech control circuit 115 connecting the handset to communication lines 140, 141. The controller 109 sends the information from the magnetic card reader 110 to the communication lines 140, 141. On the other hand, an exchange implements connection control of a call according to the information. Thus, the telephone exchange service employing a magnetic card is provided with the connection of an analog 2-wire system.
Inventors:
Masumi Kumakura
Yuji Kobayashi
Yuji Kobayashi
Application Number:
JP35089791A
Publication Date:
May 29, 2000
Filing Date:
December 11, 1991
Export Citation:
Assignee:
Hitachi Telecom Technology Co., Ltd.
International Classes:
H04M1/66; H04M1/00; H04M1/675; H04M3/00; H04M3/42; H04M15/00; H04M15/34; H04M19/00; (IPC1-7): H04M3/42; H04M1/00; H04M1/675; H04M15/00; H04M15/34; H04M19/00
Domestic Patent References:
| JP63127646A | ||||
| JP60165152A | ||||
| JP2149096A |