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 + 40F

 

 

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

 

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Cisco Systems ATA187I1ARF manual Ringing Characteristics, Software Specifications