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M-982-02P Folha de dados(PDF) 4 Page - Clare, Inc. |
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M-982-02P Folha de dados(HTML) 4 Page - Clare, Inc. |
4 / 7 page Truth Table Signal Present (fo) Mode Det 1 Det 2 Det 3 Det 4 Det 5 Strobe PD OE EN 350 Hz X 1 X X X X 1 0 1 1 400 Hz (Note) 0 X 1 X X X 1 0 1 1 620 Hz (Note) 1/open X 1 X X X 1 0 1 1 440 Hz X X X 1 X X 1 0 1 1 480 Hz X X X X 1 X 1 0 1 1 425 Hz X X X X X 1 1 0 1 1 Other (no detect) X 0 0 0 0 0 0 0 1 1 Any X 0 0 0 0 0 0 1 1 X Any X 0 0 0 0 0 0 0 1 0 Any X High Impedance X 0 0 1 Any X High Impedance 0 0 0 0 Any X High Impedance X 1 0 X www.clare.com 4 M-982-02 Rev. 4 Call Progress Tone Detection Call progress tones are audible tones sent from switching systems to calling parties to show the status of calls. Calling parties can identify the success of a call placed by what is heard after dialing. The type of tone used and its timing vary from system to system, and though intended for human ears these signals can provide valuable information for automated calling sys- tems. The M-982-02 contains five signal detectors sensitive to the frequencies often used for these progress tones. Electronic equipment monitoring the DET n outputs of the M-982-02 can determine the nature of signals present by measuring their duty cycle. See the Tri- State Timing Diagram on page 5 for a diagram of a cir- cuit that could be used to permit a microcomputer to directly monitor tones on the telephone line. Much of the character of the progress tones is in their duty cycle or cadence (sometimes referred to as interrup- tion rate). This information, coupled with level and fre- quency indication from the M-982-02, can be used to decide what progress tones have been encountered. For example,dial tones as shown in the Call Progress Tone tabel on page 3 are usually “on” continuously and last until the first dial digit is received by the switching system. Line Busy, on the other hand, is turned off and on at a rate of 1 Hz with a a 50% duty cycle, or an inter- ruption rate of 60 times per minute (60 IPM). The tones can be distinguished in this way. It should be noted that while such techniques will usually be effective, there are some circumstances in which the M-982-02 cannot be accurately used. Examples include situations where ringback tone may be short or not even encoun- tered. Ringback may be provided at ringing voltage fre- quency (20 or 30 Hz) with some harmonics and may not fall in the detect range, and speech or other strong noise may obscure tones making cadence measure- ment difficult. Standards do exist and should be consulted for your particular application. In North America AT&Ts “Notes on the Network” or EIAs RS-464 PBX standard should be reviewed. In Europe tone plans may vary with locale, in which case the CEPT administration in each country must be consulted. Outside these areas, national PTT organizations can provide information on the systems within their borders. |
Nº de peça semelhante - M-982-02P |
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Descrição semelhante - M-982-02P |
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