Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

How to calculate the peak voltage on telephone line?

Status
Not open for further replies.

cqjhq

Newbie level 6
Joined
Dec 2, 2002
Messages
11
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
75
How to calculate the peak voltage on telephone line when the telephone ring?
 

IanP

Advanced Member level 5
Joined
Oct 5, 2004
Messages
7,942
Helped
2,310
Reputation
4,622
Reaction score
531
Trophy points
1,393
Location
West Coast
Activity points
66,416
Typical telephone line DC voltage is 48V and ring voltage is typically 90 vrms or 130V peak but can be upt to 130V RMS.
Calculations would be rather difficult as the line is a physical thing..
Regards,
IanP
 

eda_surfer

Newbie level 6
Joined
May 31, 2005
Messages
12
Helped
1
Reputation
2
Reaction score
0
Trophy points
1,281
Activity points
1,472
You may use an Osciloscope for that.
 

cqjhq

Newbie level 6
Joined
Dec 2, 2002
Messages
11
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
75
could you tell me the highest votage on T1 line and ISDN line? I have to select a lightning protection component baseing on this. Thanks for your any help.
 

IanP

Advanced Member level 5
Joined
Oct 5, 2004
Messages
7,942
Helped
2,310
Reputation
4,622
Reaction score
531
Trophy points
1,393
Location
West Coast
Activity points
66,416
" .Recommendation: Any over-voltage protectors (Gas Arrestors or similar) which are connected to the earth bonding of the product shall have a minimum DC sparkover voltage of 1.6 times the rated voltage of the unit."
For more see "Telecom Design Guide" : https://www.i-spec.com/Product_Design/telecom_design_guide.html#ISDN

Regards,
IanP
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top