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RJ-45
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).
rj-45.jpg                 Rj45plug-8p8c.png
Image from : http://en.wikipedia.org/wiki/File:Rj45plug-8p8c.png
 
RJ-48C aka T1/E1 RJ-45
 
rj-48C.jpg
 
RJ-49C aka BRI RJ-45
 
rj-49C.jpg
 
RJ-48S aka 56K DDS RJ-45
 
rj-48s.jpg
 
RJ-11/RJ-14 aka Standard Analog Connector (6P-4C)
 
rj-14_rj-11.jpg
 
RJ-9/RJ-10/RJ-22 aka RJ-11 Narrow (4P-4C)
NOTE: RJ-9, RJ-10, RJ-22, and RJ-11 Narrow are not official standards.  This connector is official called "Modular Connector 4P-4C"
rj-9_rj-10_rj-22.jpg
 
 
RJ-21 aka 50-pin Telco connector, CHAMP, or Amphenol Connector
 
RJ21-female-connector2.jpg
Image from: http://en.wikipedia.org/wiki/File:RJ21-female-connector.jpg
 
A101/A102/A104
a101_2_4-sc2.jpg
a101_2_4-co2.jpg
a101_2_4-lb.jpg
 
 
A108
a108-sc.jpg
a108-co.jpg
a108-lb.jpg
 
A500
bri Y straight cable.jpg
bri straight cable.jpg
bri-lb.jpg
 
B700
bri Y straight cable.jpg
bri straight cable.jpg
rj-14 Y cable.jpg
bri-lb.jpg
rj-14_rj-11-lp-2.jpg
 
A200
rj-11n to rj-14.jpg
rj-9_10_11n_22-lp.jpg
 
A400
DB-25 cable.jpg
a400-lp.jpg
 
B600
rj-14 Y cable.jpg
B600 FXS cable.jpg

b600-tpv2.jpg
 
U100
u100 cable.jpg
 
S514
 
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 Pinout:
pinout.png