![]() We will discuss this standard in detail here. This standard was published in the Unix System Administration Handbook in 1994, and has since that moment been a wiring standard for many organisations. He tried to define a standard comparable to DECConnect, where both DTEs and DCEs could be connected with one cable type. Very interesting is the RS232 to RJ45 wiring standard proposed by Dave Yost in 1987, based on earlier wiring schemes used at Berkeley University. Therefore it primarily remained a standard for DTE to DCE connection in a world where the primary use of RS232 was to interconnect DTEs directly. ![]() Unfortunately this attempt didn’t twist the cable internally. The RS-232D standard (more properly called EIA/TIA 561) was the official attempt for a standard to transmit RS232 over RJ45. UTP and FTP cables with RJ45 connectors became the de-facto standard in office cabling systems, and people started looking for ways to transmit RS232 signals over this cabling system. ![]() Maybe because DEC used an non-standard version of the modular jack. This interfacing standard became available on most of their hardware, but it wasn’t adopted by other computer manufacturers. With DECConnect, Digital Equipment Corporation tried to define their own standard for serial interconnection of computer devices with MMJ modified modular jack connectors. No standard was defined for null modem connections with RS232 and not long after their introduction, several different wiring schemes became common. Originally the standard was defined for DTE, data terminal equipment to DCE, data communication equipment connection, but soon people started to use the communication interface to connect two DTEs directly using null modem cables. The wiring of RS232 has always been a problem. Goals of the Yost serial wiring standard.Introduction in the Yost wiring standard.
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