Cisco ATA-186 Administration Guide - Page 179
Physical Interfaces, Ringing Characteristics, Software Specifications - complex impedance
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Appendix C Cisco ATA Specifications Physical Interfaces Physical Interfaces Table C-4 Physical Interfaces Description Ethernet Analog telephone Power Indicators Specification Two RJ-45 connectors, IEEE 802.3 10BaseT standard Two RJ-11 FXS voice ports 5 VDC power connector Function button with integrated status indicator Activity LED indicating network activity Ringing Characteristics Table C-5 Ringing Characteristics Description Specification Tip/ring interfaces for each RJ-11 FXS port (SLIC) Ring voltage Ring frequency 40VRMS (typical, balanced ringing only) 25 Hz Ring waveform Trapezoidal with 1.2 to 1.6 crest factor Ring load 1400 ohm + 40µF Ringer equivalence number (REN) Up to 5 REN per RJ-11 FXS port Loop impedance Up to 200 ohms (plus 430-ohm maximum telephone DC resistance) On-hook/off-hook characteristics On-hook voltage (tip/ring) -50V Off-hook current 27 mA (nominal) RJ-11 FXS port terminating impedance option The Cisco ATA186-I1 and Cisco ATA188-I1 provide 600-ohm resistive impedance. The Cisco ATA186-I2 and Cisco ATA188-I2 provide 270 ohm + 750 ohm // 150-nF complex impedance. Software Specifications Table C-6 Software Specifications (All Protocols) Description Call progress tones Dual-tone multifrequency (DTMF) Specification Configurable for two sets of frequencies and single set of on/off cadence DTMF tone detection and generation OL-3410-01 Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator's Guide (SIP) C-3