Paradyne 3980-A2-GZ40-20 manual Data Synchronization, Clocks at the DTE±DCE Interface

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Data Synchronization

Data exchanged between the synchronous DTE and the modem is synchronized by two clock signals. Data coming from the DTE is synchronized by the transmit clock and data received by the DTE is synchronized by the receive clock. The transmit clock is provided by the modem on circuit 114 or by the synchronous DTE on circuit 113. The receive clock is provided by the modem on circuit 115.

When the transmit clock is provided by the modem, the transmit and receive clocks are locked on the same clock source internal to the modem. In this configuration, the user can select rates on the DTE-DCE line (or clock frequencies) in the range from 1.2 kHz to 128 kHz.

When the transmit clock is provided by the DTE, the receive clock is set by the modem equal to the DTE clock (Figure 4). When SDC is in use, the Tx Clock Source configuration option cannot be set to Receiver Clock Loop.

NOTE

When faster speeds are used (above 57.6 kHz), and the transmit clock is provided by the modem, data transmission can be sensitive to DTE cable length and capacitance, as well as the DTE's drivers and receivers. Should you encounter bit errors related to the above conditions, you may want to change the Tx Clock Source configuration option setting to External (provided the DTE can support the required transmit clock signal) or change the length of the DTE cable.

XTCLK (113)

DCE

 

 

TXC (114)

DTE

 

 

RXC (115)

 

CLOCK

 

SOURCE

 

495-14782

Figure 4. Clocks at the DTE±DCE Interface

3980-A2-GZ40-20

November 1996

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Contents Sample DTE Exchange of Data via Synchronous Protocol and SDC OverviewInstalling the SDC Feature Using the DCP Installing the SDC FeatureMenu Status and Result Codes Installing the SDC Feature Using AT Commands42/MNP/Buffer see Table SDC User Interface42/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 Clocks at the DTE±DCE Interface Data SynchronizationSDC Negotiation Flow Control MethodMonitoring SDC Performance DTE Configuration Tuning SDC EfficiencySoftware License Agreement Modem ConfigurationTerm

3980-A2-GZ40-20 specifications

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