Samsung Ubigate iBG3026 Configuration Manual page 76

CHAPTER 6. Serial Interfaces
HSSI assumes a peer-to-peer intelligence in the DCE and DTE. The control
protocol is simplified, with just two control signals required('DTE available'
and 'DCE available'). Both signals must be asserted before the data circuit can
become valid. The DCE and DTE are expected to be capable of managing the
networks behind their interfaces. Reducing the number of control signals
improves circuit reliability by reducing the number of circuits that can fail.
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The HSSI interface may be operated in either DTE or DCE mode
depending on the cable type. For consistency, all signal names and
functional definitions use DTE terminology. Thus, Receive Data is
data received by the module from the attached piece of equipment,
while Transmit Data is data being sent to the attached equipment
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