IT1247417B - Device for protecting electrical and electronic equipment of telephone exchanges from electrical disturbances affecting telecommunications lines connected to the exchanges - Google Patents

Device for protecting electrical and electronic equipment of telephone exchanges from electrical disturbances affecting telecommunications lines connected to the exchanges

Info

Publication number
IT1247417B
IT1247417B ITBO910154A ITBO910154A IT1247417B IT 1247417 B IT1247417 B IT 1247417B IT BO910154 A ITBO910154 A IT BO910154A IT BO910154 A ITBO910154 A IT BO910154A IT 1247417 B IT1247417 B IT 1247417B
Authority
IT
Italy
Prior art keywords
exchanges
terminals
electrical
electronic equipment
lines connected
Prior art date
Application number
ITBO910154A
Other languages
Italian (it)
Inventor
Renzo Frulla
Cesare Lasagni
Original Assignee
I E T Spa Soc Applic Industr E
Meta System Spa
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by I E T Spa Soc Applic Industr E, Meta System Spa filed Critical I E T Spa Soc Applic Industr E
Priority to ITBO910154A priority Critical patent/IT1247417B/en
Publication of ITBO910154A0 publication Critical patent/ITBO910154A0/en
Publication of ITBO910154A1 publication Critical patent/ITBO910154A1/en
Application granted granted Critical
Publication of IT1247417B publication Critical patent/IT1247417B/en

Links

Abstract

The device, interposed between the terminals AR, BR of a network connection and the terminals AC, BC of an exchange connection, comprises two resistors R, through each of which the current from the corresponding network terminal passes, and across whose terminals there is established a potential difference which is used, if the said current exceeds a predetermined value, as the signal for activating a corresponding electronic unit 20. The activation of a unit causes the connection of the corresponding network terminal to an earth terminal 3; the unit is also activated if the voltage present across its terminals exceeds a predetermined value. The units 20 are integrated with a three-pole arrester 40, branched between the network terminals, whose operation is co-ordinated with the activation of the units by means of two non-linear PCT resistors 30, each of which is interposed between the arrester and the corresponding unit 20 and has the current from the corresponding network terminal passing through it. <IMAGE>
ITBO910154A 1991-05-07 1991-05-07 Device for protecting electrical and electronic equipment of telephone exchanges from electrical disturbances affecting telecommunications lines connected to the exchanges IT1247417B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
ITBO910154A IT1247417B (en) 1991-05-07 1991-05-07 Device for protecting electrical and electronic equipment of telephone exchanges from electrical disturbances affecting telecommunications lines connected to the exchanges

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITBO910154A IT1247417B (en) 1991-05-07 1991-05-07 Device for protecting electrical and electronic equipment of telephone exchanges from electrical disturbances affecting telecommunications lines connected to the exchanges

Publications (3)

Publication Number Publication Date
ITBO910154A0 ITBO910154A0 (en) 1991-05-07
ITBO910154A1 ITBO910154A1 (en) 1992-11-07
IT1247417B true IT1247417B (en) 1994-12-13

Family

ID=11337471

Family Applications (1)

Application Number Title Priority Date Filing Date
ITBO910154A IT1247417B (en) 1991-05-07 1991-05-07 Device for protecting electrical and electronic equipment of telephone exchanges from electrical disturbances affecting telecommunications lines connected to the exchanges

Country Status (1)

Country Link
IT (1) IT1247417B (en)

Also Published As

Publication number Publication date
ITBO910154A1 (en) 1992-11-07
ITBO910154A0 (en) 1991-05-07

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Legal Events

Date Code Title Description
0001 Granted
TA Fee payment date (situation as of event date), data collected since 19931001

Effective date: 19950531