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FX602P3 Datasheet(PDF) 19 Page - CML Microcircuits

Part No. FX602P3
Description  CALLING LINE IDENTIFIER
Download  29 Pages
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Maker  CMLMICRO [CML Microcircuits]
Homepage  http://www.cmlmicro.com
Logo CMLMICRO - CML Microcircuits

FX602P3 Datasheet(HTML) 19 Page - CML Microcircuits

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Calling Line Identifier
FX602
© 1998 Consumer Microcircuits Limited
19
D/602/7
Note that the 50ms monitoring period of the CONFIRM_QUIET state when added to the 0.5 to 10ms de-
response time of the FX602 in Tone Alert Detect mode and the 0 to 5ms delay in switching to FSK mode
results in a valid CAS detection occurring at between 50 and 65 ms after the end of the CAS, leaving at least
35ms for muting the local handset fully, testing for off-hook extensions and initiating the dtmf ACK transmission
while still meeting the 100ms specified for CIDCW from end of the dual-tone burst to the start of the ACK. See
also note 3 below.
When the transaction has been completed then remove speech muting, reset the timer, set the FX602
to Tone Alert Detect mode and return to the INITIAL state.
6. WAIT_DET_LOW state
This state is entered from the MEAS_DET_HIGH state when the FX602 DET output has been high for 65ms
i.e. for too long to be a valid CAS.
Wait for the DET output to go low then reset the timer and return to the INITIAL state.
Times T1, T2 & T3
The values given below have been selected to give an extremely low incidence of false CAS detections while
maintaining a high probability of decoding correct CIDCW initiation signals by taking advantage of the specific
profile of FX602's responses to typical speech and CAS signals. Two options are given, the choice being
determined principally by how easily the local speech can be muted.
a)
When the CIDCW circuits are built into the telephone set so that locally generated speech can be
muted quickly and without injecting noise then it is recommended that:
T1 should be zero, i.e. muting should be initiated as soon as the FX602 DET output goes high.
T2, the time for local speech muting to take effect, should be as short as possible and in any
case not more than 5ms.
T3, the minimum length of a valid DET output high time, should be 15ms.
b)
When the CIDCW circuits are housed in an adjunct box so that muting is only possible by interrupting
the 2-wire connection to the telephone set, then it is recommended that:
T1 should be 15ms i.e. speech muting should only be initiated after the DET output has been
high for 15ms.
T2, the time for speech muting to take effect, should be as short as possible and in any case
not more than 5ms.
T3, the minimum length of a valid DET output high time, should be equal to T1 plus T2 plus
10ms, i.e. between 25 and 30ms.
Option (b) reduces the frequency of short speech mutes by a factor of about 5 at the expense of a small
increase in the number of missed CAS signals.


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