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Top Products: Handsets Fixing Phone Lines No Dial Phones & Dialers Installation Tools CAT5-6 Jacks PoE

Echo Stopper



FIXING ECHO and DTMF RECOGNITION PROBLEMS


Most of the phone lines in the world are analog. It's become a challenge connecting those lines to VoIP phone systems, or VoIP phone lines to regular phone systems, because of the inherent delay in the process of creating IP packets.

We never saw these echo problems with digital phone lines or phone systems using TDM technology because the process of digitizing analog to TDM is much faster than creating IP packets.

If you have other problems to fix, or you just want to become an expert on repairing phone line problems, our Testing and Repairing Phone Lines product page will show you products and give you technical information.


ECHO STOPPER™ LINE IMPEDANCE MATCHER - ADJUSTS THE IMPEDANCE!


Echo Stopper™ Line Impedance MatcherEcho Stopper™
Adjustable Line Impedance Matcher

 

Matches telephone equipment
to the phone line to reduce echo
and fix DTMF recognition problems.

Makes up for impedance mismatches between the phone line and the trunk card's hybrid transformer.

Stops Echo on VoIP Phone Systems!

The Echo Stopper™ Adjustable Line Impedance Matcher changes the impedance from about 600 to 1200 ohms, depending on which way the Red Range Switch is pushed, and how you adjust the recessed POT.

If you always hear echo on every call, and you don't
hear echo using your Butt-set,
there's a 99% chance
the Echo Stopper™ will eliminate the echo.

That's it!

The Echo Stopper™ enables a technician to adjust the impedance of a phone line to match the hybrid transformer on the CO line card on a phone system. VoIP phone systems are most likely to have echo problems because of the time it takes to convert analog to VoIP packets.

Cellular to POTS adapters (like Telular®) also have a lot of delay, and are likely to have echo if there's an impedance mismatch that's greater than the built-in echo canceller can handle.

Because the technician can adjust the Echo Stopper™, impedance mismatches caused by improperly placed load coils can be adjusted to make the telephone system's hybrid as efficient as possible, reducing reflected signals and echo. It's difficult to detect improperly placed load coils, and most phone companies will ignore a trouble call like this.

Since DTMF digits are easily distorted by impedance mismatches, the technician may be able to improve DTMF digit recognition on automated attendants and voice mail systems with the Echo Stopper™.

If you can reproduce the echo or DTMF digit recognition problems, you should be
able to determine if the Echo Stopper™ will help in minutes.

To use the Echo Stopper™, the technician must be able to reproduce the echo. If the echo is intermittent, it probably can't be fixed by the Echo Stopper™ since it's either coming from the other end of the call, or caused by the lack of echo cancellers on only some trunks in the CO. When you hit a trunk in the CO without an echo canceller, you hear echo on that call. There's nothing that a technician can do to fix that problem, unless the phone company will help (unlikely!).

The technician can listen for the echo by either calling in to the system from another line, or using a phone on the system to call out. The technician simply tries the Echo Stopper™ on the line being tested by putting it in-series and adjusting the POT until the echo goes away. If the echo doesn't go away, just hit the Red Range Switch, and try adjusting the POT again. It's modular in and out (direction doesn't matter, use either mod jack).

The Echo Stopper™ comes with a 2 foot solid copper mod cord which can be cut, and punched down on a 66 or 110 block.

In the old days, telephone system manufacturers often put jumpers on the trunk card, or allowed the technician to choose a 600 or 900 ohm termination in programming to match the impedance of the phone line. Many manufacturers have stopped giving technicians that option, which has made it impossible to get rid of problems caused by the impedance mismatch.

Today, simply choosing 600 or 900 ohms may not be enough. If there are improperly placed load coils on a line, it might take 850 or 1150 ohms to best match the impedance of the line to the phone system's hybrid. The Echo Stopper's™ patent pending technology lets the technician adjust for the closest impedance match, giving you the best shot at eliminating echo and DTMF problems.

There are no testers that are easily used in the field to allow a technician to determine the impedance of the telephone line or CPE equipment. The quick test is to put the Echo Stopper™ in-series with the telephone line or analog station port, then adjust the POT/Range Switch to see if your problem clears.

Changing the impedance of the line can correct quite a few problems:

The Echo Stopper™ isn't Magic... But it's Close!

The Echo Stopper™ is not an echo canceller, which is usually built-into VoIP phone systems. The Echo Stopper™ changes the impedance of the line before it gets into the phone system, which reduces audio that's reflected by the hybrid (that causes echo). There's only so much echo that a phone system's echo canceller will eliminate. If you hear echo for the first second or two of a call, the built-in echo canceller is training itself. Using the Echo Stopper™ in-front of the phone system can reduce echo to the point where the built-in echo canceler can work.

IMPORTANT NOTE: A customer called and said that on the Mitel systems he works on there's an Auto, 600 and 900 impedance setting. None of those settings work for him on that system, but he said he learned to set it at 600 ohms and let the Echo Stopper match the impedance of the line to the trunk card in the system. He said not to leave it on Auto!  He said it takes about 20 seconds after going off hook for the echo to go away using the Echo Stopper if the system is set to Auto.

If you'd like more information on how the impedance of the phone system, analog station port or phone line can cause problems, see our Echo Elimination and DTMF Problem Tech Bulletin.

If you need to put in multiple Echo Stoppers™ click HERE to see our new 25 Line Telephony Chassis™

Keep an Echo Stopper™ in your case...

It will only take you a few minutes to try it, and there's
no way to know if it will work if you don't try it!

Comes with sandman.com 30 Day Moneyback Guarantee

Part # WAL5F

ECHO STOPPER

$49.95 Quantity Pricing Available

TECHNICIAN'S ECHO STOPPER™ KIT

Echo Stopper™ Line Impedance Matcher

66M to 2 Pin Modular Adapter66M to 2 Pin Modular Adapter

           Echo Stopper™                Loss Insertion Tester    Half REN Terminator™         Mod Adapters & Case
 

Everything you need to adjust the impedance and db level of a phone
or VoIP line to fix echo and DTMF problems, in one small case

Detailed information on the separate items in the kit are further up and down the page

This handy Kit lets you test at the RJ-21X by:

Or just plug them in to the phone system's modular jack.

Although the Echo Stopper™ will probably fix most echo problems, if you can fix the problem with the Half REN Terminator™ or the Loss Insertion Tester (and then use the appropriate db Attenuator), it will cost less than the Echo Stopper™. Any of these devices will be cheaper than fixing the echo with a fractional T1 and T1 card!

NOTE: Don't put in more than 1 or 2db of loss in-front of a VoIP system with the Loss Insertion Tester. Putting too much loss in the line can make an impedance mismatch worse, creating more echo (possibly in the opposite direction from before). It will only take a minute or two to see if a little attenuation will help the echo.

Keep this Kit in your truck!

Comes with sandman.com 30 Day Moneyback Guarantee

Part # WAL5J

TECH'S ECHO STOPPER KIT

$109.95

MODULAR HALF REN LINE TERMINATOR™

Click to see a bigger picture of the Modular Half REN Line Terminator




Modular Half REN Line Terminator™

Simulates a telephone with .5 REN on the line.

The Modular Half REN Box™ terminates a telephone line or analog station port at voice frequencies, changing the impedance of the line.



Changing the impedance of the line can correct quite a few problems:

The Half REN Box™ has proven to be very valuable for fixing voice mail and faxback DTMF and CNG tone recognition problems!

Connects in-series with a modular jack and plug, between the telephone line or analog station port, and the telephone equipment.

Keep some in your case!

Comes with sandman.com 30 Day Moneyback Guarantee

Part # CID9A

MODULAR HALF-REN BOX

$19.95 Quantity Pricing Available

66 TYPE HALF REN LINE TERMINATOR™

Click to see a bigger picture of the 66 Block Half REN Line Terminator


66 Type Half REN Line Terminator™

Simulates a telephone with .5 REN on the line.

The 66 Type Half REN Box™ terminates a telephone line or analog station port at voice frequencies, changing the impedance of the line.


Changing the impedance of the line can correct quite a few problems:

The Half REN Box™ has proven to be very valuable for fixing voice mail and faxback DTMF and CNG tone recognition problems!

They're made to be used on a split  66M block (66M1-50). They won't fit on a 66B block.

Connects in-series between the telephone line or analog station port on the left side of the 66 Block, and the telephone equipment on the right side of the 66 Block.

Keep some in your case!

Comes with sandman.com 30 Day Moneyback Guarantee

Part # CID9B

66 TYPE HALF-REN BOX

$22.95 Quantity Pricing Available

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MODULAR 1 to 4db LOSS INSERTION TESTER

Click to see a bigger picture of the 1 Loss Insertion Tester


1 to 4db Loss Insertion (Attenuation) Tester

There are times when you have to reduce the audio level of a telephone line.

High audio levels can lead to Touch Tone (DTMF) recognition problems, echo, and distorted sound.


The Loss Insertion Tester will let you insert 1 to 4db of loss into the line, to let you see if reducing the volume on the line will fix your problem.

Temporarily install the Loss Insertion Tester in-series between the telephone line or analog station port, and the telephone equipment. By pressing the two switches, you can insert 1, 2, 3 or 4db of loss into the pair.

There are two components to a telephone line. The DC talk battery, and the AC audio. Other devices like our Loop Current Regulator and Loop Current Attenuator only affect the DC voltage and loop current of the phone line. They're specifically made NOT to lower the AC audio on the line, since that would cause Can't Hear problems as you lowered the loop current.

The Loss Insertion Tester and Fixed Value Attenuators reduce both the DC voltage and the AC audio on the line (even though you probably only want to lower the AC audio level with these devices).

Modular 4db Telephone Line AttenuatorBy putting a Modular 4db Fixed Attenuator (not included) in-series with the Loss Insertion Tester, you can insert 5, 6, 7 or 8db of loss into the pair when you push the switches.

It's unlikely you'll need to insert more than 8db of loss onto a regular phone line. For each 1db of loss you insert, it reduces the loop current on the line by about 1ma.

If you insert too much loss, and bring the loop current below 23ma, you'll create other problems on the line like cut-offs, answering and dialing problems. You should be watching the loop current on your meter or Loop Current Tester as you attenuate the line, to make sure you don't go below 23ma.

NOTE: Don't put in more than 1 or 2db of loss in-front of a VoIP system with the Loss Insertion Tester. Putting too much loss in the line can make an impedance mismatch worse, creating echo (rather than fixing it). It will only take a minute or two to see if a little attenuation will help echo problems on a VoIP phone system or line.

We have both Modular and 66 Block versions
of our Fixed Attenuators

Comes with sandman.com 30 Day Moneyback Guarantee

Part # CID9I

1 TO 4db LOSS INSERTION TESTER

$38.95

MODULAR TELEPHONE LINE ATTENUATORS

Click to see a bigger picture of the Modular Telephone Line Fixed Value Attenuator


Modular Telephone Line Fixed Value Attenuators

There are times when you have to reduce the audio level of a telephone line.

Our Modular Fixed Value Attenuators come in 1, 2, 3, 4, 6 and 8db values. They are very useful for reducing echo on a phone line or station port.

The loop current will drop by about 1ma for every 1db of attenuation you add to the line.

You can cascade the Modular Fixed Value Attenuators in-series with each other to add attenuation. A 1db Attenuator and 8db Attenuator would give you a total of 9db of attenuation.

If you insert too much loss, and bring the loop current below 23ma, you'll create other problems on the line like cut-offs, answering and dialing problems. You should be watching the loop current on your meter or Loop Current Tester as you attenuate the line, to make sure you don't go below 23ma.


MODULAR 1db ATTENUATOR

One pair passes through Attenuator (RJ-11).

Comes with sandman.com 30 Day Moneyback Guarantee

Part # CID9J

1db MOD ATTENUATOR

$19.95 Quantity Pricing Available

MODULAR 2db ATTENUATOR

One pair passes through Attenuator (RJ-11).

Comes with sandman.com 30 Day Moneyback Guarantee

Part # CID9K

2db MOD ATTENUATOR

$19.95 Quantity Pricing Available

MODULAR 3db ATTENUATOR

One pair passes through Attenuator (RJ-11).

Comes with sandman.com 30 Day Moneyback Guarantee

Part # CID9L

3db MOD ATTENUATOR

$19.95 Quantity Pricing Available

MODULAR 4db ATTENUATOR

One pair passes through Attenuator (RJ-11).

Comes with sandman.com 30 Day Moneyback Guarantee

Part # CID9M

4db MOD ATTENUATOR

$19.95 Quantity Pricing Available

MODULAR 6db ATTENUATOR

One pair passes through Attenuator (RJ-11).

Comes with sandman.com 30 Day Moneyback Guarantee

Part # CID9N

6db MOD ATTENUATOR

$19.95 Quantity Pricing Available

MODULAR 8db ATTENUATOR

One pair passes through Attenuator (RJ-11).

Comes with sandman.com 30 Day Moneyback Guarantee

Part # CID9O

8db MOD ATTENUATOR

$19.95 Quantity Pricing Available

66 BLOCK TELEPHONE LINE ATTENUATORS

Click to see a bigger picture of the 66 Block Telephone Line Fixed Value Attenuator


66 Type Telephone Line Fixed Value Attenuators

There are times when you have to reduce the audio level of a telephone line.

Our 66 Block Fixed Value Attenuators come in 1, 2, 3, 4, 6 and 8db values. They are very useful for reducing echo on a phone line or station port.

They're made to be used on a split  66M block (66M1-50). They won't fit on a 66B block.

Connects in-series between the telephone line or analog station port on the left side of the 66 Block, and the telephone equipment on the right side of the 66 Block.

The loop current will drop by about 1ma for every 1db of attenuation you add to the line.

If you insert too much loss, and bring the loop current below 23ma, you'll create other problems on the line like cut-offs, answering and dialing problems. You should be watching the loop current on your meter or Loop Current Tester as you attenuate the line, to make sure you don't go below 23ma.


66 BLOCK 1db ATTENUATOR

Only fits on a split  66M block.

Comes with sandman.com 30 Day Moneyback Guarantee

Part # CID9C

1db 66 TYPE ATTENUATOR

$22.95 Quantity Pricing Available

66 BLOCK 2db ATTENUATOR

Only fits on a split  66M block.

Comes with sandman.com 30 Day Moneyback Guarantee

Part # CID9D

2db 66 TYPE ATTENUATOR

$22.95 Quantity Pricing Available

66 BLOCK 3db ATTENUATOR

Only fits on a split  66M block.

Comes with sandman.com 30 Day Moneyback Guarantee

Part # CID9E

3db 66 TYPE ATTENUATOR

$22.95 Quantity Pricing Available

66 BLOCK 4db ATTENUATOR

Only fits on a split  66M block.

Comes with sandman.com 30 Day Moneyback Guarantee

Part # CID9F

4db 66 TYPE ATTENUATOR

$22.95 Quantity Pricing Available

66 BLOCK 6db ATTENUATOR

Only fits on a split  66M block.

Comes with sandman.com 30 Day Moneyback Guarantee

Part # CID9G

6db 66 TYPE ATTENUATOR

$22.95 Quantity Pricing Available

66 BLOCK 8db ATTENUATOR

Only fits on a split  66M block.

Comes with sandman.com 30 Day Moneyback Guarantee

Part # CID9H

8db 66 TYPE ATTENUATOR

$22.95 Quantity Pricing Available