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Ex-Caavo employee (Ex-TiVo, '00-'16)
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I did some testing with wireless modem jacks in the past and figure it wouldn't hurt to post some extra information here as well, although it seems most likely that the OP is only using a wireless phone jack.

All 4 wireless modem jacks that we recommend (see this article) are manufactured by the same company and will work. However, there are some specific troubleshooting steps for wireless modem jacks that need to be addressed. These are taken from the phonex set of instructions, but apply to all modem jack models.
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ENVIRONMENTAL FACTORS
A surge protector absorbs RF (radio frequency) and the wireless modem jack puts an RF signal on the wiring of the home. The surge protector absorbs much of the RF signal that the units send, which reduces the performance of the system. The closer the units are to the surge protector, the more the signal is absorbed by the suppressor. The wireless modem jack cannot be plugged into or in the same electrical outlet as a multi-outlet strip or surge protector.

This last line means that the wireless modem jacks need to be plugged directly into the wall outlet, not an extension chord or surge protector. It also means that the other socket in the wall outlet cannot even have a surge protector, or in some cases an extension chord, plugged into it.

In many cases, I have found that this was the problem the customer was experiencing.
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LINE SPLITTER
A line splitter plugs directly into the hard wired phone jack and separates line one and line two into two separate phone jacks. The customer may run a phone cord
from line one or line two directly into the base unit, which in turn allows the extension to pick whichever line the base is connected to. In other words, if two lines are being used, only one line can operate through the wireless modem
jack system.
CAUTION: The telephone line splitter should not be attached to the extension unit.
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FLUORESCENT LIGHTS/HALOGEN LIGHTS
Fluorescent and halogen lights emit feedback onto the electrical lines, causing static or interference on the extension.
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DIMMER SWITCHES
Dimmer switches emit radio frequency (RF) similar to the wireless modem jack. A dimmer switch in the same room as the wireless modem jack system may result
in static on the extension.

***Also, if the customer has the units plugged into a "switched" electrical outlet (one controlled by a wall switch), they may experience a similar problem. If the
switch is off, the units don't get power and cannot function***
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Appliances such as touch lamps, dimmer switches, fluorescent and halogen lights, etc. may cause static. A radio frequency line filter (RF or AC line filter) can be
used with the interfering appliance. This will solve most static problems caused by the above mentioned items(when it is possible to plug the interfering appliance
directly into the filter.)

DO NOT plug the wireless modem jack into the line filter. This will reduce the performance of the modem jacks.
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SEPARATE POWER CIRCUITS (my own addition)
If the two units are placed on separate power circuits in the home, the signal has to go through the circuit box. Poor electrical connections between the two circuits
may also cause static. It will be necessary to try placing the wireless modem jacks into differenct wall outlets to eliminate static interference.

Customers may not always like the way they'll have to place these throughout a home, particularly a small "wall outlet challenged" apartment, but these troubleshooting steps are for the wireless modem jacks, not the actual device transmitting signals through them.

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Basically, the customer should plug a telephone into the extension unit and listen to the line quality. If there is static on the line, there will be problems downloading
data.
 
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