REN stands for Ringer Equivalency Number, meaning the maximum number of analog phones can be connected on a FXS port that a VOIP Gateway can support.
Our gateways support the following for REN
- REN=5 for short distance (<300 meters) with normal voltage 60V or under.
- REN=3 for medium distance (<1500 meters) with normal voltage 60V or under.
- REN=1 for long distance (<3000 meters ) with normal voltage 60V or under.
In some extreme cases where line requires high voltage, the distance will be shorter to achieve the same REN, or the REN will be reduced. To achieve maximum REN you must use wire gauge 22 or lower. For short distances you and normal voltage you can use wire gauge 24 or lower.
Our gateways put out 60V ringing voltage, the voltage will drop based on wire length and wire gauge before reach to analog phones, each phone will have its own impedance and ringing voltage range. If the dropped voltage at analog phones is within the phones’s ringing voltage range, phones will ring properly. Otherwise if dropped voltage falls out of phones’ ringing voltage range, phones will not ring.
Uploading ....