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ATA (as for any electronic device).
Due to this limited power, there is a maximum number of devices (telephones, wireless base unit, fax modems, answering machines, etc) that can be connected to the ATA either directly or through the House Wiring. Devices that rely on the power supplied from the telephone line will likely reduce this number.
The "maximum number" will vary for each user based on the types of devices used, and the house wiring involved.
[POTS lines also had a limit defined in 3-5 REN, although this was not generally obvious as more recent telephones are electronic and have their own power supplies.]
Although Primus does not recommend connecting more than a few phones (see below), some users have connected up to six phones to the ATA through their house wiring, using no power boosters, with no problems at all. These users are most likely using electronic phones (each with their own power supply).
If you have problems with devices not working correctly (such as phones not ringing):
•Verify the DVG Hardware Version (if you are using the D-Link ATA).
•Test each device by plugging it in one at a time into the applicable ATA port ("1" or "2").
•You may have too many devices plugged into the circuit. A defective - or HIGH LOAD - device will load the circuit, and may cause the ringers to fail. Try different combinations of devices on the circuit. Unplug one device at a time (while leaving others plugged in) to perhaps isolate a defective or HIGH LOADING device.
• In some extreme situations, you may have a defective ATA; but this should be rare.
An unofficial Primus perspective: