Cisco Systems ATA187I1ARF manual Ringing Characteristics, Software Specifications

Appendix A ATA 187 Specifications

Ringing Characteristics

Ringing Characteristics

Table A-5	Ringing Characteristics
Description		Specification
Tip/ring interfaces for each RJ-11 FXS port (SLIC)
Ring voltage		40VRMS (typical, balanced ringing only)
Ring frequency		20 Hz
Ring waveform		Trapezoidal with 1.2 to 1.6 crest factor
Ring load		1400 ohm + 40F
Ringer equivalence number (REN)		Up to 5 REN per RJ-11 FXS port
Loop impedance		Up to 200 ohms (plus 430-ohm maximum phone DC
		resistance)
On-hook/off-hook characteristics
On-hook voltage (tip/ring)		–48V
Off-hook current		24 mA (nominal)
RJ-11 FXS port terminating impedance option		The ATA 187-I1 provides multiple impedance, such
		as 600 ohm for American SKU, 900 ohm for
		European SKU, 220 ohm (820 ohm 120nF) for
		Australian SKU, and so on.

Software Specifications

Table A-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		Fax pass-through and T.38 fax relay 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 187 Analog Telephone Adaptor Administration Guide for SIP (Version 1.0)

OL-21862-01 A-3