Continue to Site

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.

PBX design help.how to start???

Status
Not open for further replies.

eng_ahmed22

Full Member level 3
Full Member level 3
Joined
Jun 7, 2005
Messages
189
Helped
20
Reputation
40
Reaction score
5
Trophy points
1,298
Activity points
2,944
hi every body.

i want to build a PBX, with only internal telephon lines (no CO interface at the begining) let us say 4 internal lines,
can any body suggest schamatic or block diagram or anything to start???
i have some experience (2 years) in installing SIEMENS PABX (up to 500 line) now i hope to start to build my private PBX.
thanks alot for ur time
have a nice day

AHMED
 

Maybe this project will be of any help to you:

Home made PBX

Specifications:

-Eight telephone extensions with roughly telco spec voltages and currents (48V onhook, 90VRMS 20Hz sinusoidal ringing, about 25mA loop current offhook.) Ring trip is sub-spec but can handle at least 3 "500" type rotary dial telephone sets in parallel without false tripping. Lines are not balanced, nor is one side ground.

-One central office line capable of inbound calls (ring detector) and outbound calls with DTMF and pulse dialing (selectable, independent of the type of extension phones. That is, the PBX can convert tone-pulse and pulse-tone.)

-Three internal voice buses, meaning up to three calls in progress simultaneously.

-Telco standard call progress tones (dial, busy, fast busy, audible ringing.)

http://wandel.ca/homepage/pbx.html

Regards,
Ianp
 
Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top