Flow Control Method

The data transmitted from the DTE is sent to the DCE at a rate determined by the transmit clock frequency. When SDC is active, this data is then compressed in the DCE and sent to the remote DCE at the line rate less than the rate between the DTE and DCE (usually twice, three, or four times less). If the data sent by the DTE is not compressible, or bad line conditions cause retransmissions between the two DCEs, then the transmitting DCE must indicate to the transmitting DTE its temporary inability to accept more data; this is flow control. Flow control is also required in Buffer mode since the DTE rate and line rate can be different. Three methods are used to control the DTE flow:

•Hardware signal CTS (circuit 106).

•Transmit clock (circuit 114). If the transmit clock is clamped, then the DTE stops sending data. This method only works when the transmit clock is provided by the modem.

•Natural flow control. Some DTEs can only send a limited number of information frames without any acknowledgment from the remote DTE. This number is the acknowledgment window size. If the DCE buffers this number of DTE frames, it will not receive another DTE frame. This is equivalent to the SyncFlowControl configuration option being set to None.

SDC Negotiation

The use of SDC and the values of the associated parameters are negotiated at link establishment via a protocol. The three associated parameters have the same meaning as those used for asynchronous data compression:

•Dictionary size parameter

•Maximum string length parameter

•Data compression request parameter

The SDC Negotiation configuration option determines how two modems connect when one or both modems have SDC enabled. Two settings are available in the SDC Negotiation configuration option: LAPM_Buffer and LAPM_Discon.

Table 5 shows the six possible SDC Negotiation configuration scenarios.

14

November 1996

3980-A2-GZ40-20

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Paradyne 3980-A2-GZ40-20 manual Flow Control Method, SDC Negotiation
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3980-A2-GZ40-20 specifications

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