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 exchangesInfo
- 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
Links
- 230000004913 activation Effects 0.000 abstract 2
- 230000003213 activating effect Effects 0.000 abstract 1
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>
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) |
-
1991
- 1991-05-07 IT ITBO910154A patent/IT1247417B/en active IP Right Grant
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 |