PC Com Port - EIA-574 RS-232/V.24 pin out on a DB-9 pin used for asynchronous data
X.21 interface on a DB 15 connector
RS232D uses RJ45 type connectors (similar to telephone connectors)
This is a standard 9 to 25 pin cable layout for async data on a PC AT serial cable 
Some applications require more pins than a simple async. configurations.
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