Editing Registered jack (section)

==RJ48==
{| class="wikitable floatright"
|+ RJ48C and RJ48X wiring
! Pin !! Pair !! Signal
! width=160 | Color
|-
| 1 || R  || RX ring
| [[File:Wire orange white stripe.svg|37px]] Orange/white
|-
| 2 || T  || RX tip
| [[File:Wire white orange stripe.svg|37px]] White/orange
|-
| 3 ||    || Reserved
| [[File:Wire white green stripe.svg|37px]] White/green
|-
| 4 || R1 || TX ring
| [[File:Wire blue white stripe.svg|37px]] Blue/white
|-
| 5 || T1 || TX tip
| [[File:Wire white blue stripe.svg|37px]] White/blue
|-
| 6 ||    || Reserved
| [[File:Wire green white stripe.svg|37px]] Green/white
|-
| 7 ||    || Shield
| [[File:Wire white brown stripe.svg|37px]] White/brown
|-
| 8 ||    || Shield
| [[File:Wire brown white stripe.svg|37px]] Brown/white
|}

RJ48 is used for [[Digital Signal 1|T1]] and [[ISDN]] termination, local-area data channels, and subrate digital services. It uses the eight-position [[modular connector]] (8P8C).

RJ48C is commonly used for [[Digital Signal 1|T1]] circuits and uses pin numbers 1, 2, 4 and 5.

RJ48X is a variation that contains shorting blocks in the jack for troubleshooting: With no plug inserted, pins 2 and 5 (the two ''tip'' wires) are connected to each other, and likewise 1 and 4 (''ring''), creating a ''loopback'' so that a signal received on one pair is returned on the other. Sometimes this is referred to as a ''self-looping jack''.

RJ48S is typically used for local-area data channels and subrate digital services and carries one line. It accepts a keyed variety of the 8P modular connector.

RJ48 connectors are fastened to shielded twisted pair (STP) cables, not the unshielded twisted-pair (UTP) commonly used in other installations.
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