Simple Phone Exchange System

[Thomas Ritche]

I need to make a simple automatic phone exchange system.
Is it possible?

Can anyone tell me the web site writing about automatic phone exchange system?

Thanks,

Thomas Ritche

 

[Joseph Legris]

I need to make a simple automatic phone exchange system.
Is it possible?

Can anyone tell me the web site writing about automatic phone exchange system?

Thanks,

Thomas Ritche

How many phones? For what purpose? Where are you going to install it?

 

[Zak]

I need to make a simple automatic phone exchange system.
Is it possible?

These are never simple. In concept yes, but not in practice. Lots of
details. Phones must ring (generate ringer voltage). Dialing must be
detected, and so on.

What can be doen is a simple switch. 1 line, first phone to pick up gets
the call. Others dead at that stage.

Transfer by yelling, other person picks up, you drop, and the transfer
is complete.

You could expand from here, but things get big quickly. Maybe using a PC
makes the most sense.


Thomas

 

[Jim Wall]

The simple answer is that it is not simple. Assuming you are trying to
crossbar x inbound trunk lines to y destination phone points then you
need to address both inbound calls, outbound calls, how to determine
when a call in progress has ended, and the edge case conditions of
insufficient resources to complete a call. Essentially this is what a
small PBX does.

If you want to make a small central office switch: connecting trunk
lines to trunk lines then you have a much more interesting problem
with line loss and signal quality.

There are a fair number of web sites that have PBX information on
them. If you have specific questions, then I would ask them on
comp.dcom.telecom.tech


-Jim

 

[Thomas Ritche]

How many phones? For what purpose? Where are you going to install it?

I want to make exchange with 50 phones per exchange with trunk facalities.
I will use it in village area of our country.

 

[N. Thornton]

The simple answer is that it is not simple. Assuming you are trying to

[email protected] (Thomas Ritche) wrote in message news:

Hi

Well, its possible to fake it simply. All you need for that is an
answerphone. You plug the ansaphone and upto 4 phones in in parallel,
and put the following message on the tape: 'Hi, youve reached the
xyzco exchange. Please say who you wish to talk to and you will be
connected to the nearest telephone automatically.'

Now, on an incoming call all phones ring twice, then you hear the
callers response to the message. The right person picks up the phone.


Regards, NT

 

[J Michael Milner]

How many phones? For what purpose? Where are you going to install it?

I want to make exchange with 50 phones per exchange with trunk facalities.
I will use it in village area of our country.

Your question requires answers to many more questions before a good answer
can be given. First off, to what standards do you need to build so your
system can connect to the phone sets you would use and the trunking used
in your country? How do you intend to power the exchange? What functions
must the exchange provide besides call origination and termination (e.g.
billing)?

If you were talking about remote rural areas in the US, the simple answer
would likely be a SLC (Subscriber Loop Concentrator) attached by a pair of
T1s to a class 5 switch. The requirements documents for these devices in
the US run to hundreds of pages in what was once called the LSSGR, so it
is indeed not a simple task.

Mike Milner

 

[Watson A.Name - 'Watt Sun']

I need to make a simple automatic phone exchange system.
Is it possible?

Can anyone tell me the web site writing about automatic phone exchange system?

Thanks,

Thomas Ritche

Possible, but the one I saw in an elecronics magazine had one side of
the incoming phone line connected to the internal ground. Now that's
not only bad for a balanced line, but it is unsafe.

Your best bet is to pick up a used system that will handle the number
of phone sets and incoming lines you need. A good used Panasonic or
similar will sell for a few hundred dollars.

Try the newsgroups comp.dcom.telecom.tech or alt.dcom.telecom.

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[The real Andy]

And another important point. Peoples' lives depend on the phones, so
if they don't work in an emergency, you could be in very deep trouble.

Not in Australia.

 

[Watson A.Name - 'Watt Sun']

Not in Australia.

Yeah, well.. Oz doesn't count.


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@@F@r@o@m@@O@r@a@n@g@e@@C@o@u@n@t@y@,@@C@a@l@,@@w@h@e@r@e@@
###Got a Question about ELECTRONICS? Check HERE First:###
http://users.pandora.be/educypedia/electronics/databank.htm
My email address is whitelisted. *All* email sent to it
goes directly to the trash unless you add NOSPAM in the
Subject: line with other stuff. alondra101 <at> hotmail.com
Don't be ripped off by the big book dealers. Go to the URL
that will give you a choice and save you money(up to half).
http://www.everybookstore.com You'll be glad you did!
Just when you thought you had all this figured out, the gov't
changed it: http://physics.nist.gov/cuu/Units/binary.html
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[Richard Freeman]

Not in Australia.

Nope maybe not in deep Trouble just a $14,000 fine for a non compliant
Telephone System ...... You only get away with it if you are Telstra