Cross-over UTP cables 

There is only two ways to wire an Ethernet UTP, STP or FTP cable. That is straight-through (patch) or cross-over.

Crossed cables are now practically irrelevant for anything but older equipment. Modern switches auto-sense the connections meaning that you can use straight cables almost everywhere – but when using devices without auto-sensing abilities, you may still need a crossed-over cable.

When to use a crossed cable if you are not equipped with auto sensing devices?
The easiest way to remember where to use a cross-over cable, is to know that devices that transmit and receive on the same pins require cross-over.
That is for example Pc to Pc, Router to Router, PC to Router, Switches to Bridge, etc. (this will require cross-over.)
Likewise, devices that transmit and receive on opposite pins require straight-through. That is for Switch to PC, Switch to Router, etc.
Devices that transmit on pins 1, 2 and receive on pins 3, 6 is the following:
 
 Device 
 1   PC's 
2  DVR’s and NVR’s 
3  Routers 
4  Wireless Access Point (AP) 
5   IP Camera’s 
6  Network printers 
Devices that transmit on pins 3, 6 and receive on pins 1, 2 is the following:
 
 Device 
 1   Switches 
2  Bridges 
3  Hubs 
 Wiring of a Cross-over cable