cx20493-35/app Conexant Systems, Inc., cx20493-35/app Datasheet - Page 27
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cx20493-35/app
Manufacturer Part Number
cx20493-35/app
Description
With Cx20493 Smartdaa?
Manufacturer
Conexant Systems, Inc.
Datasheet
1.CX20493-35APP.pdf
(92 pages)
- Current page: 27 of 92
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2.6.5
2.7
2.7.1
2.7.2
102247B
CX81801-7x/8x SmartV.XX Modem in 128-Pin LQFP with CX20493 in 32-Pin LQFP Data Sheet
MNP 5 Data Compression
Telephony Extensions
Line In Use Detection
Extension Pickup Detection
MNP 5 data compression mode, enabled by the %Cn command, operates during an MNP
connection.
In MNP 5, the modem increases its throughput by compressing data into tokens before
transmitting it to the remote modem, and by decompressing encoded received data before
sending it to the DTE.
The following telephony extension features are supported and are typically implemented
in designs for set-top box applications and TAM software applications to enhance end-
user experience:
•
•
•
The telephony extension features are enabled through the -STE command. The -TTE
command can be used to adjust the voltage thresholds for the telephony extension
features.
The Line In Use Detection feature can stop the modem from disturbing the phone line
when the line is already being used. When an automated system tries to dial using ATDT
and the phone line is in use, the modem will not go off hook and will respond with the
message “LINE IN USE”. In the case where no phone line is connected to the modem,
the modem will respond with the message “NO LINE”.
The Extension Pickup Detection feature (also commonly referred as PPD or Parallel
phone detection) allows the modem to detect when another telephony device (i.e., fax
machine, phone, satellite/cable box) is attempting to use the phone line. When an
extension pickup has been detected, the modem will go on-hook and respond with the
message “OFF-HOOK INTRUSION”.
The Remote Hangup Detection feature will cause the modem to go back on-hook and
respond with the message “LINE REVERSAL DETECTED” during a data connection
when the remote modem is disconnected for abnormal termination reasons (remote phone
line unplugged, remote server/modem shutdown). For Voice applications, this method
can be used in addition to silence detection to determine when a remote caller has hung
up to terminate a voice recording.
This feature can be used to quickly drop a modem connection in the event when a user
picks up a extension phone line. For example, this feature allows set top boxes with an
integrated SmartV.XX modem to give normal voice users the highest priority over the
telephone line.
This feature can also be used in Telephone Answering Machine applications (TAM). Its
main use would be to stop the TAM operation when a phone is picked up.
Line In Use detection
Extension Pickup detection
Remote Hang-up detection
Conexant
2-7
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