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AI-5120
- Telephone Line Monitor
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The AI-5120 is a compact device designed for monitoring and analyzing signals present on the telephone line. By sensing the voltage present on the telephone line it detects and measures ringing, DTMF & pulse dialing, FSK (Bell 202 and V.23) signals, line polarity reversals, and open switching intervals (OSI). Working in conjunction with the TRsSim software on a PC, the AI-5120 becomes a valuable tool in analyzing and debugging Caller ID and SMS (Short Message Service) data transmission. Like an oscilloscope,
it can capture and display waveforms showing various signals present on the telephone line.
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Features | Applications | Details | Options
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Information
Features
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Detect and
decode Telecordia, ETSI, and NTT Caller ID |
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Detect and
decode ETSI (ES 201 912) SMS messages |
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Detect and
measure DTMF dialing |
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Capture and
view waveforms (time or frequency domain) |
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Monitor
signals using external BNC or speaker output |
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Measure DC
line voltage, AC RMS level, and frequency |
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Programmable
filters (low pass, high pass, band pass, notch, DTMF
band split, C-message weighted) |
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Detect DC
related events such as on-hook, off-hook, line flash,
line reversal, and OSI (open switching interval) |
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Export/Import
waveforms to/from text or wave (.wav) files |
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Trigger
waveform recording using digital inputs |
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Monitor line
status, ringing status, and FSK decoder status using
digital outputs |
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Details
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The
AI-5120 is designed primarily to monitor and analyze signals
present on the telephone line. A key application is
trouble shooting and debugging fixed line SMS (Short Message
Service) and Caller ID applications. By detecting and
recording FSK or DTMF signals, it allows users to view and
analyze the waveforms for potential problems. Unlike an oscilloscope, it
can automatically triggers on events specific to telephony.
These include hook switch transitions, DTMF signals, CAS/DTAS
signals, or FSK signals. As a line monitor, the AI-5120 does not go off-hook (seize the line), or generate tones. It only listens. The impedance presented by the AI-5120 to the telephone line is over 10 Mohm. As such it has little to no effect on any signals present on the telephone line.
The supplied TRsSim
software provides a high level graphical user interface for controlling the AI-5120. As events are detected, the software displays timing and measurement information. In addition, waveforms for each event may be recorded for display and further analysis. Waveforms can be played back to the AI-5120's BNC monitor or speaker out, or exported as wave files for analysis using various software packages.
Any signals present on the telephone line may be routed to the AI-5120's rear panel BNC output connector or
the speaker jack. This provides a simple means to pass signals to external equipment requiring an unbalanced input. A wide range of programmable filters can be inserted in the signal path helping to reject unwanted signals and isolating the desired signals. Also available on the rear panel of the AI-5120 is a digital I/O connector. The three digital outputs can be used to notify external equipment when the telephone line goes off-hook, when ringing is detected, and the decoded bit pattern from the FSK demodulator. By using the two digital inputs, external equipment can trigger the TRsSim software to record signals present on the telephone line.
The optional AI-5120 Instrument Suite software converts the unit into a spectrum analyzer and digital storage oscilloscope. The spectrum analyzer operates over a 35 kHz bandwidth with features such as variable span, peak hold, averaging, and cursor measurements. The DSO portion of the software supports up to a 5 second memory depth in addition to programmable triggers, filters, and cursors.
The AI-5120 connects to the PC via either a full speed (12 Mbit/s) USB 2.0 interface, or a legacy RS-232 communications port.
Windows 98SE, 2000, or XP is required to operate the TRsSim
software or the Instrument Suite software.
For more information on:
TRsSim - Telephone Line
Monitor Software
DSO/SA Instrument Suite
Software
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Options
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Waveform Analysis: AI-ET003 (view
examples)
The TRsSim software can include an optional component that provides more advanced analysis tools. The Waveform Analysis option gives the TRsSim software the
ability to:
Show byte & bit level decoding for FSK waveforms
Generate detailed physical layer FSK analysis reports
Generate detailed DTMF analysis reports
Generate detailed CAS/DTAS analysis reports
Detect and analyze network tones (dial, ring back, busy)
Perform waveform filtering and transforms
Instrument Suite
Software: AI-SS100
The AI-5120 Instrument Suite is a Windows (98SE, 2000, XP) software package allowing the AI-5120 Telephone Line Monitor to operate as a digital storage oscilloscope (DSO) and spectrum analyzer. The software enables the user to investigate the time domain and frequency domain representation of signals through an intuitive instrument like software interface.
Additional One Year Warranty: AI-K001
Increases the parts and labor warranty
period from the standard one year to a total of
two years from date of purchase.
Additional Three Warranty: AI-K003
Increases the parts and labor warranty
period from the standard one year to a total of
four years from date of purchase.
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