Research
Fill the Void II: An Investigation into Methods of Reducing Voiding
Final Finish Specifications Review
DFX on High Density Assemblies
Challenges on ENEPIG Finished PCBs
Testing PCBs for Creep Corrosion
Screening of Lower Melting Point Pb-Free Alloys
Hand Printing using Nanocoated and other High End Stencil Materials
Board Processes and Effects on Fine Copper Barrel Cracks
MORE RESEARCH
Latest Industry News
Foxconn Says China Can No Longer Be 'The World's Factory'
Microsoft's new phone is ... $1,400? Why?
Hon Hai says Q2 results satisfactory
China Launches Beidou, Its Own Version of GPS
Do Engineers Live Longer? A Look at Occupational Factors' Effect on Longevity
The iPhone is still breaking sales records during the pandemic
How to Work from Home Successfully
Smartphone shipments in China plunge 35% in July
MORE INDUSTRY NEWS

Dead Phone and the Mysterious Dialer



Dead Phone and the Mysterious Dialer
A home had cable telephone but the phone line started going completely dead, mysteriously fixing itself just before the repairman arrived.
Mysteries of Science

Transcript


A cable repairman was checking a new digital phone system in an old historic home. The home had been switched over to cable telephone the previous month. But the phone line had started going completely dead, mysteriously fixing itself just minutes before the repair man arrived.

As the repair man was about to leave the home owner alerted him that the phone had suddenly gone dead again. He disconnected the main phone line and was able to get the dial tone from the street line.

When the house phone was reconnected it was once again working. The repair man thought the problem could be a line short but the temporary disconnect fixed the problem.

After checking all of the house phones one line was weaker and had some static. Picking up the kitchen phone the repair man heard the unmistakable beep, beep, beep of someone dialing. But no one in the house was on the phone.

What was causing the phone to go dead intermittently? What was the dialing sound that the repair man heard?

Here's the rest of the story.

The security alarm console in the kitchen was connected to a controller in the basement. Guess what was connected to the alarm control? A phone line, of course.

The alarm computer was not too happy when someone disconnected the power to the console in the kitchen and called headquarters.

When headquarters' main computer checked the active customer log and found that no one was paying the bill. The master computer simply hung up.

The result was an open line every time the home security computer waited on the line for the master to reply.

Comments

No comments have been submitted to date.

Submit A Comment


Comments are reviewed prior to posting. You must include your full name to have your comments posted. We will not post your email address.

Your Name


Your Company
Your E-mail


Your Country
Your Comments



Board Talk
Cleaning Reballed BGA Components
We Bake, But Still Have Delamination, Why?
Reflow For Rigid Flex
Solder Paste Volume for BGA Rework
Problems With Starved "J" Lead Joints
Delay Before Cleaning Partial Assemblies
Can a CTE Mismatch Cause Reliability Problems?
Solder Paste Transfer Efficiency - What/Why
MORE BOARD TALK
Ask the Experts
Soldering Components with Silver Pads
Environment Impact on Assembly, Printing and Reflow
Solder Balling Prediction Formula
Old Components and Blow Holes
Estimating Failure Rate During Rework
Coating to stop tin whisker growth?
Cleaning an assembled board with IPA
Remove and replace a 240 pin connector
MORE ASK THE EXPERTS