The REN is used to determine the number of devices that may be connected to a telephone line. Excessive RENs on a telephone line may result in the devices not ringing in response to an incoming call. In most but not all areas, the sum of RENs should not exceed five (5.0).
Interesting. The phones in our 2 bedrooms and kitchen have what seems to be a pretty high REN of 1.08. So, if the ringer is turned-off, wouldn't that lower the REN? No need for all of them to ring when we can hear one or two...
Also, correct me if wrong, exceeding an ideal REN number seems to only impact a phone ringing? That's important of course, but wondering if it impairs the quality of the call though...
Nowadays this is not much of an issue, because most every plastic telephone in existence these days care little to get their power from the old in-house copper telco-wiring. These phones simply come with separate AC/DC transformers (which plug from the base... into the AC Mains separately) and provide all the operational current needed for both phone-electronics and the chirpy 'ringer-tone' they sport to announce an incoming-call.
There are still inexpensive phones being sold today that get only the current from the RJ11 jack which attaches them to the phone-grid. This is the type of phone that still relies on the RJ11 TEL connector to operate with all their features (battery/dial-tone/bell-ringer) intact. Hence they post an REN on their sticker or base, so the user knows how much current these phones expect to draw on the in-home copper-grid for normal use.
ooma hardware: core (hub/scout) and Telo
Premier, Lifetime Member
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Any phone purchased today will have a REN that is less than 1.
Telo with 2 Handsets, a Linx, and a Safety Phone
Telo2 with 2 Handsets and a Linx