30 Nov
1999
30 Nov
'99
1:45 p.m.
Q1: Can anyone tell me the two tone that make up dial tone?
Q2: What's the ring voltage (p-p) and frequency? 90Vpp? 10cyc?
Q3: What's the off hook and on hook line Voltage? 9VDC and 45VDC?
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1 Dec
1 Dec
5:03 a.m.
New subject: Teleco Question... More on my devious plan....
First, Thanks to all who have helped so far...
I have some old modems (TRS-80, acoustic and etc.) which I would like to
use (flashing LEDs are cool) so, I want to build a little telco emulator to
interface with the modems in one of my Linux boxes.
I figure an LM556 for the dial tone... A tone decoder for dialing... Not
sure an easy way to decode pulse dialing.
As for ring... I am thinking using two charged capacitors and switching
them. That's the first method I came up with to limit the current cheaply.
Any suggestions? I'd like to do this for less that $25.00.
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5:39 a.m.
New subject: Teleco Question... More on my devious plan....
At 10:03 AM 12/1/99 -0600, Arfon Gryffydd wrote:
I have some old modems (TRS-80, acoustic and etc.)
which I would like to
use (flashing LEDs are cool) so, I want to build a little telco emulator to
interface with the modems in one of my Linux boxes.
You'd think it would be easy, and you think someone out there would
have done it already. I wanted to do this once upon a time. It would
seem like a great project for an old PC, a parallel port, a few
junk-box relays and maybe a sound card. I think I mentioned this
idea on this list a year or two ago, and Sellam (apparently a telco
wizard) thought it could get complicated.
- John
8:12 a.m.
New subject: Teleco Question... More on my devious plan....
Hi!
TRS-80 is the one of the early computers that could generate two
frequencies at once. You will have to write a small basic program and
need a amplifier to connect the tones to the line. It is not complicate
thing to do. All you need is get a Basic programming manual for TRS-80
and look for tone generating section. If I recall correct these tones
have different timings. 2600HZ for CCITT-5 is about 300ms and others
~200ms.
Hope this helps
awc
John Foust wrote:
At 10:03 AM 12/1/99 -0600, Arfon Gryffydd wrote:
I have some old modems (TRS-80, acoustic and etc.)
which I would like to
use (flashing LEDs are cool) so, I want to build a little telco emulator to
interface with the modems in one of my Linux boxes.
You'd think it would be easy, and you think someone out there would
have done it already. I wanted to do this once upon a time. It would
seem like a great project for an old PC, a parallel port, a few
junk-box relays and maybe a sound card. I think I mentioned this
idea on this list a year or two ago, and Sellam (apparently a telco
wizard) thought it could get complicated.
- John 
3:12 p.m.
New subject: Teleco Question... More on my devious plan....
At 10:03 AM 12/1/99 -0600, Arfon Gryffydd wrote:
I know I have heard of something called a "ring generator" that can be used
I think in multiphone systems. I think it was part of some kind of modem,
but best advice is just go ask the phone guys in comp.dcom.modems etc.
I have some old modems (TRS-80, acoustic and etc.)
which I would like to
use (flashing LEDs are cool) so, I want to build a little telco emulator to
interface with the modems in one of my Linux boxes.
You'd think it would be easy, and you think someone out there would
have done it already. I wanted to do this once upon a time. It would
seem like a great project for an old PC, a parallel port, a few
junk-box relays and maybe a sound card. I think I mentioned this
idea on this list a year or two ago, and Sellam (apparently a telco
wizard) thought it could get complicated.
- John 
2 Dec
2 Dec
3:43 a.m.
New subject: Teleco Question... More on my devious plan....
At 10:39 AM 12/1/1999 -0600, you wrote:
At 10:03 AM 12/1/99 -0600, Arfon Gryffydd wrote:
I built a box about twenty years ago to ring a telephone on stage. If you
find nothing better I will try to find the schematic. If I remember
correctly it was four power transistors in a sort of flip-flop, and ran off
dry cells.
Regards
Charlie Fox
Charles E. Fox
Chas E. Fox Video Productions
793 Argyle Rd. Windsor N8Y 3J8 Ont. Canada
email foxvideo(a)wincom.net Homepage http://www.wincom.net/foxvideo
I have some old modems (TRS-80, acoustic and etc.)
which I would like to
use (flashing LEDs are cool) so, I want to build a little telco emulator to
interface with the modems in one of my Linux boxes.
1 Dec
1 Dec
7:36 a.m.
New subject: Teleco Question... More on my devious plan....
Arfon said (on Wednesday, December 01, 1999 11:04 AM):
I want to build a little telco emulator . . .
If you want to save time. . .
A few months ago I broke down and paid the man $125 for this device:
http://www.vikingelectronics.com/products/linesimulator/dle-200b.html
through one of the pricey test equipment catalog companies.
It's expensive but sets up in No time and does its job well.
Probably can be found cheaper somewhere.
I opened it up when I got it. Think they used a PIC.
It figures.
If you don't want to save time. . .
If you haven't heard of the MicroChip PIC then there's another place
to look. I just peeked at http://www.microchip.com but didn't
find this Application quickly.
JEA
7:52 a.m.
New subject: Teleco Question... More on my devious plan....
I have some old modems (TRS-80, acoustic and etc.)
which I would like to
use (flashing LEDs are cool) so, I want to build a little telco emulator to
interface with the modems in one of my Linux boxes.
Circuit Cellar ran a series of articles on doing this sort of stuff; they
outlined the design of a simple mini-PBX, and gave sample schematics of
portions of it.
4 Dec
4 Dec
11:29 a.m.
New subject: Teleco Question... More on my devious plan....
I have a schematic for a fone line emulator somehwere.. you can press a
button to make it ring and a few other things.. a bit complex and the
parts are estimated at around $100.
However, if you can force the linux box to answer and the micro to go into
term mode, you can use 2 9V batteries in series on one side of a phone
wire going between the modems.
Kevin
On Wed, 1 Dec 1999, Arfon Gryffydd wrote:
First, Thanks to all who have helped so far...
I have some old modems (TRS-80, acoustic and etc.) which I would like to
use (flashing LEDs are cool) so, I want to build a little telco emulator to
interface with the modems in one of my Linux boxes.
I figure an LM556 for the dial tone... A tone decoder for dialing... Not
sure an easy way to decode pulse dialing.
As for ring... I am thinking using two charged capacitors and switching
them. That's the first method I came up with to limit the current cheaply.
Any suggestions? I'd like to do this for less that $25.00.
----------------------------------------
Tired of Micro$oft???
Move up to a REAL OS...
######__ __ ____ __ __ _ __ #
#####/ / / / / __ | / / / / | |/ /##
####/ / / / / / / / / / / / | /###
###/ /__ / / / / / / / /_/ / / |####
##/____/ /_/ /_/ /_/ /_____/ /_/|_|####
# ######
("LINUX" for those of you
without fixed-width fonts)
----------------------------------------
Be a Slacker! http://www.slackware.com
Slackware Mailing List:
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1 Dec
1 Dec
5:31 a.m.
An excellent source for telco related stuff is the newsgroup
comp.dcom.telecom
Will
8992
days inactive
8996
days old
10 comments
10 participants
participants (10)
-
a2k＠one.net -
arfonrg＠texas.net -
awcl＠awcoldstream.com -
cisin＠xenosoft.com -
eric＠brouhaha.com -
foxvideo＠wincom.net -
jallain＠databaseamerica.com -
jfoust＠threedee.com -
mikeford＠socal.rr.com -
wpe101＠banet.net