DSCX-V34LF-066 View Datasheet(PDF) - Conexant Systems
Part Name
Description
MFG CO.
DSCX-V34LF-066
Conexant Systems
'DSCX-V34LF-066' PDF : 82 Pages View PDF
CX86500 SCXV.xx Modem Data Sheet
2.6.5
2.7
2.8
2.8.1
2.8.2
102287F
MNP 5 Data Compression
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.
Voice Pass-Through Mode
Voice Pass-Through Mode supports data transfer sampled at 8 KHz. Mu-Law and A-Law
are supported both in serial and parallel modes. 14-bit PCM is supported in parallel mode
only.
For 14-bit PCM, data is transmitted in 8-bit words. Bit 0 of each 8-bit word is used to
identify the most significant byte and the least significant byte (see Section 3.7.2.3).
When transmitting data, bit 0 must be set to 0 identify the most significant byte B(15:8)
or it must be set to 1 to identify the least significant byte B(7:0). During transmission, the
most significant byte must precede the least significant byte.
The 14-bit PCM data receive format is the same as the transmit format. During reception,
the most significant byte precedes the least significant byte. Bit 0 is set to 0 to identify the
most significant byte or it is set to 1 to identify the least significant byte.
Telephony Extensions
The following telephony extension features are supported and are typically implemented
in designs for set-top box applications to enhance end-user experience:
⢠Line-in-use detection
⢠Extension pick-up detection
⢠Remote hang-up detection
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.
Line-in-Use Detection
The line-in-use detection feature can stop the modem from disturbing the phone line
when the line is already being used. When an attempt is made to dial using ATDT and the
phone line is in use, the modem will not go off hook and will respond with the message
âLINE IN USEâ.
Extension Pick-up Detection
The extension pick-up 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 pick-up has been detected, the modem will go on-hook and respond with the
message âOFF-HOOK INTRUSIONâ.
Conexant
2-7
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