Paradyne 3980-A2-GZ40-20 manual Tuning SDC Efficiency, DTE Configuration

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Both groups have DTE Rate, Compression Ratio, and Line Efficiency measurements. Each measurement is an average of the last ten seconds' data, and is updated every second. See Table 6.

Table 6

SDC Performance Measurements

Group

DTE Rate

Compression Ratio

Line Efficiency

 

 

 

 

TX

The number of bits per second

The ratio between the number of

The ratio between the number of

 

received from the DTE. This

bits in the input and output of the

bits per second sent on the line,

 

number takes into account only

compression algorithm. The

and the line rate. The calculation

 

the data between the opening and

calculation does not include the

does not include the DCE

 

closing flags of the HDLC frames.

overhead of the LAPM frame or

interframe time fill.

 

Flags and DTE interframe time fill

the DTE flags and DTE

 

 

are ignored.

interframe time fill.

 

 

 

 

 

RX

The number of bits per second

The ratio between the number of

The ratio between the number of

 

sent to the DTE. This number

bits in the output and input of the

bits per second received from

 

takes into account only the data

decompression algorithm. The

the line, and the line rate. The

 

between the opening and closing

calculation does not include the

calculation does not include the

 

flags of the HDLC frames. Flags

overhead of the LAPM frame or

DCE interframe time fill.

 

and DTE interframe time fill are

the DTE flags and DTE

 

 

ignored.

interframe time fill.

 

 

 

 

 

Tuning SDC Efficiency

SDC efficiency is dependent on the configuration parameters of the DTE and the modem.

DTE Configuration

The way DTE parameters are changed, and whether they can be changed, depends on your DTE. See the documentation that came with your DTE.

DTE rate configuration parameter. The nominal DTE rate (the Tx/Rx clock's frequency at the DTE/DCE interface) can be a bottleneck. Increase the nominal DTE rate:

•If the DTE rate measurement reported by your modem is close to the nominal DTE rate.

•If the Line Efficiency measurement reported by your modem is substantially less than 100 percent.

•If the ratio between the nominal DTE rate and the line rate is less than the Compression Ratio.

DTE acknowledgment window size configuration parameter. This is the number of information frames the DTE will send without awaiting positive acknowledgment. Increase the DTE acknowledgment window size if your modem reports a low DTE rate and a comparatively high Compression Ratio (and therefore a Line Efficiency measurement substantially less than 100 percent). Set it to the maximum possible value.

DTE frame size configuration parameter. If SDC modems are used between synchronous DTEs, then the DCE frame size (and not the DTE frame size) must take into account the line error rate. Set the DTE frame size to as large a value as your DTE and your DTE application can handle. This reduces the significance of DTE frame overhead, and reduces the delay (expressed in number of DTE frames) for positive acknowledgment.

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November 1996

3980-A2-GZ40-20

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Contents Overview Sample DTE Exchange of Data via Synchronous Protocol and SDCInstalling the SDC Feature Installing the SDC Feature Using the DCPInstalling the SDC Feature Using AT Commands Menu Status and Result CodesSDC User Interface 42/MNP/Buffer see Table42/MNP/Buffer Configuration Options for SDC 42/MNP/Buffer Configuration Options for SDC 42/MNP/Buffer Configuration Options for SDC DTE Interface Configuration Options for SDC DCP LCD Registers for SDC Description Register Registers for SDC Description SDC Algorithm Synchronous Data FormatDTE and DCE Frames Data Synchronization Clocks at the DTE±DCE InterfaceFlow Control Method SDC NegotiationMonitoring SDC Performance Tuning SDC Efficiency DTE ConfigurationModem Configuration Software License AgreementTerm

3980-A2-GZ40-20 specifications

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