Sponsored Content
Special Forums Hardware Modem connection between two local PCs Post 302698277 by Corona688 on Sunday 9th of September 2012 03:02:58 PM
Old 09-09-2012
You can't connect two modems jack-to-jack and expect them to work, you're missing something important, the telephone company. You'd need something odd like long-haul modems to connect without a telco.

I read an article in a magazine long ago -- might have been Popular Electronics -- schematics for a device which would do this; a sort of telephone-company-in-a-box. It would generate dialtones and react to a number being dialed on one end by ringing on the other, but it was a big and complicated device due to the high voltages needed to drive telephone lines and the complexity of having to understand DTMF audio. They could probably miniaturize it further these days, but most hobbyists don't care about POTS anymore.

Last edited by Corona688; 09-09-2012 at 04:13 PM..
 

8 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Modem problem: "Sorry, modem is busy"

Hi! I have a little prob with dialing up to the internet... When I try connect, it says "Sorry, modem is busy"... Specs: Laptop 56K modem Slackware 8.0 Kernel 2.4.5 Cheers;) (4 Replies)
Discussion started by: satan404
4 Replies

2. UNIX for Advanced & Expert Users

Terminal 'Local Echo' lost on Modem Dial-out

Can anybody help me? I am developing a utility for automating message paging to a BT alphanumeric pager. I am using a USR 56K Fax-modem connected to /dev/cuab on a Sun Ultra-10. I am using the UNIX 'tip' utility to connect to the modem and I have configured the modem as follows: Baud Rate:... (2 Replies)
Discussion started by: mybeat
2 Replies

3. UNIX for Dummies Questions & Answers

Four PCs Sharing ADSL

Hello, everyone. I have a little favor to ask. Me and my friends decided sharing an ADSL line with four PCs. PC no.1: Desktop, two netcard (2000 and 8139), Mandrake 9.0 PC no.2: Acer notebook, PC Card, RTL-8139C/8139C+, MS 98 + Win 2000 Pro PC no.3: Desktop, net card 8139, WindowME + Win 2000... (1 Reply)
Discussion started by: HOUSCOUS
1 Replies

4. UNIX for Dummies Questions & Answers

Modem - Test /dev/modem

Ok. I tried following the directions from some of the other threads, but I've hit a road block. I have red hat 7.3 and I installed the hcf package: hcfpcimodem-0.99lnxtbeta03042700k2.4.18_3-1rh.i386.rpm It installed ok, no errors, but I still can't get linux to find my modem. I've tried... (2 Replies)
Discussion started by: lawadm1
2 Replies

5. UNIX for Dummies Questions & Answers

Hyperterminal null modem connection to Solaris

I am new to Unix. I just got my SUN box from ebay with Solaris supposedly preloaded. The problem is I am unable to connect via Hyperterminal to Solaris, or more to the point, cannot tell if I have a successful connection and that solaris is the one not properly booted up. I hooked up a null... (3 Replies)
Discussion started by: seethams
3 Replies

6. AIX

serial modem connection

I configured the serial modem in my P6-550 AIX 5.3 box But i dont have telephone line. when I run the command # cu -l /dev/tty1 the output is as follows does it mean that my modem is responding to the command? can i say my serial port is working and communicating fine? Connected ... (3 Replies)
Discussion started by: pchangba
3 Replies

7. Solaris

Solaris 10 ftp connection problem (connection refused, connection timed out)

Hi everyone, I am hoping anyone of you could help me in this weird problem we have in 1 of our Solaris 10 servers. Lately, we have been having some ftp problems in this server. Though it can ping any server within the network, it seems that it can only ftp to a select few. For most servers, the... (4 Replies)
Discussion started by: labdakos
4 Replies

8. Hardware

Serial connection CAT5 instead of RS232 and Null Modem or Straight cable.

Hello, I want to connect a VT520 terminal to p3 linux box. I have two questions regarding the connection. First, is it possible to use RJ45 instead of RS232 cable. (with DB9 pin to RJ45 and DB25 to RJ45 converter). Second point is that; do i need null modem cable or straight cable... (5 Replies)
Discussion started by: vectrum
5 Replies
rate.conf(5)                                                       isdnlog 4.71                                                       rate.conf(5)

NAME
/etc/isdn/rate.conf - rate and provider configuration DESCRIPTION
isdnlog and related programs like isdnrep or isdnrate obtain the information about telephone rates or fees from a rate-file. In addition to the general data from the rate-file it is necessary to provide information about the individual situation. This is the purpose of the configuration file rate.conf. Words below consisting of uppercase letters like RATEFILE refer to the so named setting in the general isdnlog configuration file /etc/isdn/isdn.conf. General Concepts The rate-file contains one or more providers for a country. A provider covers an offer of a telephone company. Usually there are now many telephone companies in a country and most companies offer several different price lists. A provider is identified by provider number and provider variant or sub number. The provider number, short pnum, is commonly used for all offers of one company. The provider variant, short var, is used to number these offers starting from 0. A specific provider is referenced as pnum,var or pnum_var depending on the context. VBN contains the shared leading digits of the carrier selection prefixes. The entire prefix for a provider is specified in the rate-file by the B: tag. In Germany the carrier selection prefix begins with 010 followed by two or three digits which make the pnum ranging from 10 to 199. A mapping like this is not required but common. The overall format of rate.conf is similar to the rate-file, lines starting with tags P:, X:, or Q: may occur in any order and quantity. (Of course, the resulting configuration should make sense.) Provider Booking P:pnum=var Mark the provider specified by pnum and var as booked or active. Only booked providers are taken into account when isdnlog computes the connection costs. Booking also tells isdnlog the provider variant to use if there are more than one. Beside computation of real connections booking also splits the providers in two groups: the booked ones that are available at the specific subscriber line at the not booked ones that are less important for price comparison. One provider in booked group is declared the default provider by setting PRESELECTED to its pnum. This provider is assumed to be used if a connection is made without a carrier selection prefix and no exceptions matching. Exceptions to Provider Selection X:number=pnum X:number=pnumzzone Connections to number will be assigned the booked provider with pnum as provider number regardless of a dialed provider selection prefix or the PRESELECTED setting. zone if present replaces the normal zone selection based on destination codes. Exceptions can also be given in the rate-file. In rate.conf exceptions may become necessary if there different preselected providers for local and distance calls for example or if prese- lection does not apply generally, e.g. not for connections to special numbers. Provider Skipping At least for some countries there are universal rate-files distributed with isdnlog or provided elsewhere. In this case it is desirable to keep the rate-file unmodified so that updates require no further changes beyond installing the new rate-file. If a rate-file aims to cover the telephone market in an entire nation there will be always providers in it which are not available or not suitable for a specific installation. Such providers can be disabled by not booking them but they remain present and may be displayed as overall cheapest provider or the like. Provider skipping completely ignores selected, so called skipped providers, from the rate-file. To be more precise, the effect of skipped provider could also be achieved by deleting its lines starting from its P: tag to the last line before the P: tag of the next provider from the rate-file. Providers to skip can also be configured in the parameter file of isdnlog using the syntax described below in a line starting with skip- Prov= instead of Q:. Q:[!|~]list list := range[;list] range := (*|prov|prov-|-prov|prov-prov)[!|~] prov := pnum[,var] Skipping applies to all providers that are matched by a given range. If var is missing, all providers with pnum are skipped. * matches all providers. Booked providers are not skipped unless ! is given at end of the range or in front of the entire list where it applies to whole line. The ~ can be given alternatively to !. Providers that match such a range are not skipped under any circumstances. Space can occur anywhere in the line after Q:. Example: Q:*; 13,1~; 33-33,1~; 200-299!; 321-323! This skips all not booked providers except 13_1, 33_0, and 33_1. Additionally all providers with a pnum between 200 and 299 or 321 and 323 are skipped. FILES
/etc/isdn/rate.conf This file. RATECONF may be used to specify an alternative rate and provider configuration file. /usr/lib/isdn/rate-CC.dat The rate-file for your country. Replace CC with your two letter country code, e.g. de for Germany. RATEFILE defines the rate-file to use. AUTHOR
Tobias Becker <tobiasb@isdn4linux.de> SEE ALSO
isdnlog(8) rate-files(5) isdn.conf(5) ISDN 4 Linux 3.13 2007/01/05 rate.conf(5)
All times are GMT -4. The time now is 03:17 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy