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Many folks think damaging spikes, transients & surges or disruptive interference can only enter sensitive high tech equipment through the AC Power Lines.  

That ain't necessarily so! This segment we'll take a look at modems, both phone-line and cable connected. Fax and phone line connected equipment  protection is linked to everything presented here.

Phone-line connected modems

Phone lines rank right after AC power lines as sources for equipment damage and disruption. Phone lines extend across the countryside just as power lines, so the potential for surge and interference pickup exists. Indeed, usually phone lines are carried on power company poles and travel in parallel for many miles.

I know - I hear it all the time

Why worry?  Modems only cost 40 - 50 bucks!  Why spend $50 to $100 protecting a $40 / 50 investment?

Here's why.  

For one thing, your modem is your lifeline to the internet.  When it's down, your entire internet operation is down! When personnel down time, lost business opportunities and repair costs are considered - a damaged modem costs many times more than the $40 / 50 hardware cost.

Secondly. Your modem is a back door gateway to your system.  Damaging spikes and surges entering the modem have been known to be passed through to the system, inflicting additional damage.  More $$ down the drain!

OK. So maybe a few surges can enter via the phone line.  Sounds like that's about it.

Not quite! Various interference sources continuously impinge on phone lines, sometimes causing modem slow-down; other times completely disrupting communications. An overhead lightning storm can wreck havoc with modem transmission.

Phone line interference originates from lightning storms and spherics, radio, TV, police and cell phone transmitters. Electrical machinery sources and power lines in proximity to phone lines contribute to noise pick up. Note that this interference can be induced on phone lines over long wires, or locally within your building.  For instance, a local air conditioner could cause severe RF radiation that finds its way into your modem, resulting in slow down and disruption.

Both damaging surges and disrupting interference exist on phone lines in common mode (both lines to ground) and differential mode (line to line) orientation, and should be addressed when choosing a modem phone line protection system.

It is worth noting that DSL and Cable Modem internet connections are not immune from lightning surge damage or interference disruptions.

Our PDS-11, Turbo and Turbo-Max protective systems have successfully protected modems and cleared up annoying and speed robbing interference for thousands of our clients. Check them out - you can probably benefit from installing one of these protectors.

I have DSL - I don't need to worry.

DSL Service is brought into your premises via copper from a local phone central office. Copper can run hundreds to several thousand feet between the central office and your facility.  I have found that cable - whether video, audio, satellite, network or DSL - often picks up significant spikes and interference over lengths as little as 50 to 100 feet. If your internet connection is important to you, it is prudent to provide suitable protection on your DSL connection. Check these DSL Protection Systems

CABLE MODEMS

High Speed internet access is available through your local cable TV provider.

Several cable modem problem areas have developed and solutions have been developed

Cable Modem Ground Loop Problems

Broad Band, Fast Internet, Quick Web and other cable based high speed internet access services install a cable modem to interface your computer with the cable network

After adding internet access cable modem, TV or Cable FM reception may exhibit ground loop symptoms. Hum bars slowly float up or down across the TV screen or hum is heard in TV or FM audio.

Our Cable Modem Isolator has successfully eliminated ground loop problems which developed when a cable modem has been added to the computer system.

Cable Intermittent Sync problems have also occasionally  been caused by ground loop problems and can be solved with our Cable Modem Isolator

Cable Modem Suppressor

Surges or spikes from lightning or power company interruptions may be impressed on your incoming internet access cable.  Damage to modem and computer may result.

True - your provider will probably replace the modem.  But - - that may take 2 or 3 days.

If the surge passes through the modem and damages computer components, additional lost time and expense will be involved.

Reduce your damage risk and cost exposure with our Cable Modem Suppressor which easily installs directly between cable modem and incoming cable

Cable Modem Interference Choke

Interference, be it man made, RFI or atmospheric, may enter through your modem connecting cable.

This interference may ........

1. interrupt or slow down cable access
2. cause, or contribute to, "cable intermittent sync" problems

Additionally ...

Signals from within the modem may be transmitted to TV or FM receivers, leading to viewing or listening disturbances.

These types of cable conducted interference have been successfully reduced or eliminated with our Cable Modem Interference Choke

<> Compact Design  only 2-1/2" x 1-3/4"

Cable Modem Isolator Model  CBL MDM ISO . . . . .$50 <> Speed up Internet Downloads <> Protect Computer Cable Modem <> Eliminate interaction between TV & computer cable modem <> Eliminate Cable System "Ground Loops" <> Solve "Cable Intermittent Sync" problems <> Isolate Cable Modem noise & interference from your TV/Audio <> Eliminate annoying video "hum Bars" <> Eliminate irritating audio "buzz" & "hum"   Go to ..... ORDER DESK

Video monitor "Hum Bars"  or  Audio "Buzz" can drive you crazy ! !
TV - Computer Modem interaction will ruin your day !

Cable Modem Isolator completely isolates
TV <> FM <> Computer <> Video Monitors from Cable Modem "Ground Loops"
 Major cause of "hum bars" <> "buzz" <> TV-modem interaction

Great for Internet Cable Modem Isolation and Protection ! !
<> Faster Down Loads !

BONUS ! ! Cable Isolator provides 2,500 Volt Protective Barrier
between Your valuable equipment & incoming cable surges

Prevent ...........................
<> Modem or Computer Damage
<> on-line data transfer disruption

Quick  30 Second Installation
<> No cumbersome ground wire needed
<> No AC Power required
<> No Wires to cut

Restore the High Performance your equipment was designed to deliver
Order Your Cable Modem Isolator Today ! !
Model  CBL MDM ISO . . . . . ^$50

Go to ..... ORDER DESK

<> Compact Design  only 2-1/2" x 1-3/4"

Cable Modem Surge Suppressor Model  CBL MDM SUP . . . . .$40 <> Protect Computer Cable Modem <> Prevent Cable Surges from entering your computer Quick  30 Second Installation <> No cumbersome ground wire needed <> No AC Power required <> No Wires to cut   Model  CBL MDM SUP . . . . .$40 Go to ..... ORDER DESK

Cable Modem RF INTERFERENCE CHOKE

Eliminate Cable Modem / TV-FM Interference

Tired of Wiggles & Squiggles on your Computer monitor ?
Tired of neighbor's cable modem swamping your cable programs ?
Tired of erratic Web performance caused by "Cable Intermittent Sync" ?
Tired of odd patterns or colors with some equipment configurations?
Tired of wispy, cloudy background on Surveillance monitors?
Tired of just being tired?

Modem v. Power Protection

Model MVP-31

Now ... we have combined the best to bring you ... Modem v. Power Protection .... ideal for Home Office Computer / Modem protection Fax Machine protection Industrial Telemetry monitor Commercial Phone Poll systems High Profile Suppressor Protection Convenient - Plugs directly into Wall Electrical Socket Power - 58,500 Surge Amp; 1 pico-second response Modem/Phone - 3-stage hi-current, 1 pico-second suppressor Model MVP-31 ................................... U.S. $ 76 Free ! - RJ-11 connection cable Model MVP-32 (2 AC Sockets).............. U.S. $ 86 Free ! - RJ-11 connection cable Go to ....... ORDER DESK

ENTRANCE PROTECTION:

Often Modem & Phone lines are interconnected between buildings
We have designed Entrance Protection systems for many installers
Special designs for other areas of Telecommunications available
Contact us to solve your entrance protection or other telecommunication requirements

View a few of our Special Modem & Phone Protection Designs

Visit our Data line / Controller page
<> View wide range of Protectors for Data & Controller equipment

Also Available

Complete line of modem & phone protection systems in
solder terminal or screw terminal configurations

Special design modem / phone / data configurations for
telecommunications or data communications

Other plug / jack / voltage configurations

Multiple circuits in single case

View a few or our many available desig

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