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參數(shù)資料
| 型號： | MT8870 |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | () |
| 中文描述： | （） |
| 文件頁數(shù)： | 19/23頁 |
| 文件大小： | 177K |
| 代理商： | MT8870 |
Application Note
MSAN-108
A-63
the rising edge of StD. The microprocessor then
checks for a valid password sequence and decodes
subsequent commands. A command can be entered
to put the system into remote-control mode. In this
case the crosspoint switch is configured to route
DTMF signals into the FM-over-mains transmitter as
well as the system tone receiver. Forwarding of
control signals is accomplished by applying an FM
carrier to the power line. This eliminates the need to
string control wires haphazardly about the house.
The appropriate device is selected by its unique
DTMF I.D. code. The microcomputer keeps track of
all device locations and their I.D. codes since it must
decide when to supply function outputs to the
”nearby“ devices and when to let the ”remote“
receivers handle the data. Subsequent data is
transmitted to a selected device until a ’reset‘
command is entered.
Upon receiving any DTMF signal, answer back tones
are returned by the microprocessor to acknowledge
valid or invalid operations and to indicate the state of
an interrogated device. For example, a low to high
tone transition could indicate that a particular device
is on, a high to low transition indicating the off state.
A command could be entered to put the system in an
’external‘ mode which would allow communications
through the data port. A host computer could be
connected to this port to broaden the scope of the
system.
The resident microprocessor unit contains the
software and hardware to control ringing verification,
password and command decoding, answer back tone
generation, audio routing, output function latches
and an optional data port. Output drivers buffer the
latches and switch relays or SCRs to control
peripheral devices.
An infinite variety of devices could be controlled by
such a system, the spectrum of which is limited only
by the ability to provide appropriate interfacing. This
system could also be the heart of a DTMF intercom
system
allowing
intercommunication,
patching
"
, and remote control from varied household
locations. This type of system concept is, of course,
anything but limited to home use. Many applications
can
provide
conveniences
salespeople and executives.
"
phone-
to
consumers,
For example, a merchant could verify credit card
accounts quickly utilizing only a telephone keypad for
data entry (Fig. 22). Each credit card company could
reserve one or more telephone lines to provide this
function, reducing the human effort required. The
receiving end system would be required to answer
the call, provide a short answer back tone or
message, receive and decode the credit card
account number, verify it, verify the owner’s name
and give a go/no-go authorization. This return data
could easily be provided with the aid of a voice
synthesizer. An auto-dialler containing appropriate
phone numbers could be installed at the merchant
end as an added time saver.
Figure 22 DTMF Data Communications For An Auto Verification Line
CASHIER’S
PHONE
OPTIONAL
AUTO
DIALER
AUTO
ANSWER/
LINE
TERMINATION
MT8870
DTMF
RECEIVER
CREDIT CARD
ACCOUNTING
COMPUTER
VERIFICATION/
AUTHORIZATION
ALGORITHM
SPEECH
SYTHESIZER
CREDIT CARD COMPANY - AUTO VERIFICATION LINE
相關PDF資料 |
PDF描述 |
|---|---|
| MT8880C | ISO2-CMOS Integrated DTMFTransceiver |
| MT8880CE-1 | ISO2-CMOS Integrated DTMFTransceiver |
| MT8880CC | ISO2-CMOS Integrated DTMFTransceiver |
| MT8880CE | ISO2-CMOS Integrated DTMFTransceiver |
| MT8880CN | ISO2-CMOS Integrated DTMFTransceiver |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MT8870BE | 制造商:Panasonic Industrial Company 功能描述:RECEIVER |
| MT8870D | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:ISO2-CMOS Integrated DTMF Receiver |
| MT8870DC | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:ISO2-CMOS Integrated DTMF Receiver |
| MT8870DC-1 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:ISO2-CMOS Integrated DTMF Receiver |
| MT8870DE | 制造商:Microsemi Corporation 功能描述: |
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