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B-3
Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide for MGCP (version 3.0)
OL-4803-01
Appendix B Cisco ATA Specifications
Ringing Characteristics
Ringing Characteristics
Software Specifications
Table B-5 Ringing Characteristics
Description Specification
Tip/ring interfaces for each RJ-11 FXS port (SLIC)
Ring voltage 40V
RMS
(typical, balanced ringing only)
Ring frequency 25 Hz
Ring waveform Trapezoidal with 1.2 to 1.6 crest factor
Ring load 1400 ohm + 40 microF (per line)
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 25 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.
Table B-6 Software Specifications (All Protocols)
Description Specification
Call progress tones Configurable for two sets of frequencies and single set of on/off
cadence
Dual-tone multifrequency (DTMF) DTMF tone detection and generation
Fax 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.