The RJ-45 (Registered Jack 45) is one of the common physical connectors in the communications industry today eventhough it is not an official standard. An RJ-45 connector is used to refer to a 8 pin - 8 connector (8P-8C) modular connector. The name is also "RJ-45" is incorrectly used to describe a common ethernet cable (TIA/EIA-568-B).
The image below shows the pinout of a 8P-8C connector...the "tab" to hold the connector in the socket is facing down (or towards this page).
Image from : http://en.wikipedia.org/wiki/File:Rj45plug-8p8c.png
NOTE: RJ-9, RJ-10, RJ-22, and RJ-11 Narrow are not official standards. This connector is official called "Modular Connector 4P-4C"
S5141 < --- > (DB35 Male end) 619 Cable (DB 25 Male End) < --- > (DB25-Female end) 602 cable (DB 25 Male end ) < --- > ( need converter to with two Female DB 25 end) < --- >(DB 25 Male end ) 619 cable (DB 37 Male End) < --- >S5141 card.
619 Cable Pin out: