Cisco ATA188-I2-A Administration Guide - Page 205
Ringing Characteristics, Software Specifications
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Appendix C Cisco ATA Specifications Ringing Characteristics 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) Fax Specification Configurable for two sets of frequencies and single set of on/off cadence DTMF tone detection and generation G.711 fax pass-through and G.711 fax mode. Enhanced fax pass-through is supported on the Cisco ATA. Success of fax transmissions up to 14.4 kbps depends on network conditions, and fax modem/fax machine tolerance to those conditions. The network must have reasonably low network jitter, network delay, and packet-loss rate. OL-4804-01 Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator's Guide for H.323 (version 3.0) C-3