Tip/Ring Device Requirements 9
A tip/ring device must meet the following conditions:
■ It must be nonproprietary; that is, it cannot be made specifically for use on a particular telephone system.
■ Its Ringer Equivalence Number (REN) cannot be greater than 2.0. (REN) is a measure of the power it takes to ring a telephone. Each extension jack in your system handles up to 2.0 RENs.) The REN is shown on a label on the device, usually on the bottom.
You can connect a tip/ring two-line device to the system, but it should be installed and used as if it were a single-line device.
Tip/Ring Device
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