6

Spring Ware Technical Specifications

Audio Signal

Receive range

by parameter**

Automatic gain control

Application can enable/disable. Above –18 dBm results in full-scale

recording, configurable by parameter.**

Silence detection

–38 dBm nominal, software adjustable**

Transmit level (weighted average)

–9 dBm nominal, configurable by parameter**

Transmit volume control

40 dB adjustment range, with application-definable increments and legal

limit cap

Frequency Response

24 Kb/s

300 Hz to 2600 Hz ±3 dB

32 Kb/s

300 Hz to 3400 Hz ±3 dB

48 Kb/s

300 Hz to 2600 Hz ±3 dB

64 Kb/s

300 Hz to 3400 Hz ±3 dB

Audio Digitizing

24 Kb/s

ADPCM @ 6 kHz sampling

32 Kb/s

ADPCM @ 8 kHz sampling

48 Kb/s

µ-law PCM @ 6 kHz sampling

64 Kb/s

µ-law PCM @ 8 kHz sampling

Digitization selection

Selectable by application on function call-by-call basis

Playback speed control

Pitch controlled

Available for 24 and 32 Kb/s data rates

Adjustment range: ±50%

Adjustable through application or programmable DTMF control

DTMF Tone Detection

DTMF digits

0 to 9, *, #, A, B, C, D per Bellcore* LSSGR Sec 6

Dynamic range

Default set to –36 dBm to –3 dBm per tone, configurable by parameter**

Minimum tone duration

40 ms, can be increased with software configuration

Interdigit timing

Detects like digits with a 40 ms interdigit delay. Detects different digits

with a 0 ms interdigit delay.

Twist and frequency variation

Meets Bellcore LSSGR Sec 6 and EIA 464 requirements

Acceptable twist

10 dB

Signal/noise ratio

10 dB (referenced to lowest amplitude tone)

Noise tolerance

Meets Bellcore LSSGR Sec 6 and EIA 464 requirements for Gaussian,

impulse, and power line noise tolerance

Cut-through

Detects down to –36 dBm per tone into 600 Ohm load impedance

Talk off

Detects less than 20 digits while monitoring Bellcore TR-TSY-000763

standard speech tapes. (LSSGR requirements specify detecting no more

than 470 total digits.) Detects 0 digits while monitoring MITEL speech tape

#CM 7291.

Global Tone Detection

Tone type

Programmable for single or dual

Max. number of tones

Application-dependent

Frequency range

Programmable within 300 Hz to 3500 Hz

Max. frequency deviation

Programmable in 5 Hz increments

Frequency resolution

Less than 5 Hz. NOTE: Certain limitations exist for dual tones closer than

125 Hz apart.

Timing

Programmable cadence qualifier, in 10 ms increments

Dynamic range

Programmable, default set at –36 dBm to +3 dBm per tone

Datasheet