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TheBSGTT Tip and Ring TheBSGTT


RJ 45 Tip and Ring Assignments
Pin T568A T568B USOC
1 T3 T2 T4
2 R3 R2 T3
3 T2 T3 T2
4 R1 R1 R1
5 T1 T1 T1
6 R2 R3 R2
7 T4 T4 R3
8 R4 R4 R4


Where the heck is Token Ring?

USOC and Token Ring have the same configuration with the exception that Token Ring uses only the two center pair.

Pins used are:

  • 5 & 4 (T1 & R1)
  • 3 & 6 (T2 & R2)


So what about 10 Base-T?

Pins used are:
  • 1 & 2 (T1 & R1)
  • 3 & 6 (T2 & R2)


What about a T1?

T1's run on EIA TIA's 568B.

(It really doesn't matter that much as long as you know what pins a T1 connection employs and the wrinkle on Tip & Ring.)


USOC RJ48X
T1/DS1/DSX



Pins used are:
  • 1 & 2 (R2 & T2)
  • 4 & 5 (R1 & T1)


Pin Assignments
RJ48 to DB15 Adapter
Pin Path DB15 Clr DB15 Pin
1 RCV Ring Blue 11
2 RCV Tip Orange 3
4 XMT Ring Red 9
5 XMT Tip Green 1


Likewise - Frame Relay & Switched 56.


USOC RJ48S
FRAME RELAY



Pins used are:
  • 1 & 2 (T1 & R1)
  • 7 & 8 (T2 & R2)


So if you want to know Tip & Ring on a T1 or Frame Relay Circuit - just refer to the 568B column in the table above and you should be able to figure it out.

Equally - Tip & Ring on a 10 Base T twisted-pair circuit should be easy to determine using the TIA 568A or TIA 568B columns.



 
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