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T568A Patch Cable (default)
1234 5678
green
white
green orange
white
blue blue
white
orange brown
white
brown

As viewed from the back of the plug where the wires are inserted. Tab down.

T568B Patch Cable
1234 5678
orange
white
orange green
white
blue blue
white
green brown
white
brown

As viewed from the back of the plug where the wires are inserted. Tab down.


RS-232 Pinouts
DB-9DB-25SignalFunction
32TDTransmit Data
23RDReceive Data
74RTSRequest To Send
85CTSClear To Send
66DSRData Set Ready
57SGSignal Ground
18DCDData Carrier Detect
9?RIRing Indicator
420DTRData Terminal Ready

Cisco
DTE DCE
DB-9DB-25RJ-45 DB-9DB-25RJ-45
851 741
662 4202
233 323
574 574
575 575
326 236
4207187
748 858

DIN-8
PINSignalFunction
1DTRData Terminal Ready
2CTSClear To Send
3TDTransmitted Data
4SGSignal Ground
5RDReceived Data
6RTSRequest To Send
7DCDData Carrier Detect
8SGSignal Ground

CAT5-DB9
RJ45DTEDCE
NameDE9DB25NameDB9DB25
1RTS74CTS85
2DTR420DSR16
3TD32RD23
4Gnd57Gnd57
5Gnd57Gnd57
6RD23TD32
7DSR16DTR420
8CTS85RTS74

T1 crossover
P1-P2
1-5
2-4
4-2
5-1