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Data terminal equipment
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==Connections== Two different types of devices are assumed on each end of the interconnecting cable for a case of simply adding DTE to the topology (e.g. to a [[Ethernet hub|hub]], DCE), which also brings a less trivial case of interconnection of devices of the same type: DTE-DTE or DCE-DCE. Such cases need [[crossover cable]]s, such as for the [[Ethernet]] or [[null modem]] for [[RS-232]].<ref>EIA standard RS-232-C: Interface between Data Terminal Equipment and Data Communication Equipment Employing Serial Binary Data Interchange. Washington: Electronic Industries Association. Engineering Dept. 1969. {{OCLC|8250964307}}.</ref> [[D-sub]] connectors follow another rule for [[RS-232#Connectors|pin assignment]]. * 25 pin DTE devices transmit on pin 2 and receive on pin 3. * 25 pin DCE devices transmit on pin 3 and receive on pin 2. * 9 pin DTE devices transmit on pin 3 and receive on pin 2. * 9 pin DCE devices transmit on pin 2 and receive on pin 3.
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