Linksys RT31P2 Installation And Troubleshooting Manual page 84

Broadband Router with 2 Phone Ports
Ringer Equivalence
Number (REN) 5 REN per RJ-11 Port
Ring Frequency 10 Hz - 40 Hz
FXS Port Impedance Eight Configurable Settings Including North America 600 ohms, European CTR21
Ring Voltage 60 - 90 Vrms Configurable
Dimensions 7.32" x 1.88" x 6.06"
(W x H x D) (186 mm x 48 mm x 154 mm)
Unit Weight 12.70 oz. (0.36 kg)
Power External, 12V DC, 1A
Certifications FCC, cUL, CE
Operating Temp. 0ºC to 40ºC (32ºF to 104ºF)
Storage Temp. -20ºC to 60ºC (-4ºF to 140ºF)
Operating Humidity 10 to 85%, Non-Condensing
Storage Humidity 5 to 90%, Non-Condensing
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Appendix E: Specifications