Cisco Systems ATA 186 manual Ringing Characteristics, Software Specifications, Description

Appendix B Cisco ATA Specifications

		Ringing Characteristics
Ringing Characteristics
	Table B-5 Ringing Characteristics
	Description	Specification
	Tip/ring interfaces for each RJ-11 FXS port (SLIC)
	Ring voltage	40VRMS (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.
Software Specifications

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.

Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide for MGCP (version 3.0)

OL-4803-01 B-3