It may be useful to place gateways in remote locations where mains power is not available. In many cases these locations are already serviced by ethernet cabling, and if not, it is generally cheaper and faster to run ethernet or other low voltage cabling than AC mains power.
The GW22 gateway requires DC power of 7 volts or more to function. The supplied AC adapter outputs 12 volts. This allows us to use ethernet (or other low voltage cabling) to extend the power lead over long distances that may present some voltage drop, without affecting the functioning of the gateway.
To extend the cabling, simply use a pair of wires from an existing ethernet cable run (which wires is not important, but be sure to use the same colors at each end) with the included barrel plug and socket adapters in the GW22 packaging. Use the socket adapter at the power adapter side, and the plug adapter at the gateway side. Now use the extended power cable you have created to power the gateway.
For normal 24AWG Category 5 or 6 ethernet cabling this method can be used up to the maximum cable length for ethernet of 100 metres (~300ft).
With larger gauge cabling, such as Category 6A 23AWG cable, or by utilizing multiple pairs in the ethernet cable this distance can be extended significantly. 2 pairs of 22AWG cable has been successfully tested up to around 300m (~1000ft) of cable.
Note that this method cannot include the use of any active equipment in the cable run. Be certain that there are no ethernet switches or other network devices between the AC adapter and the gateway. Applying DC voltage to active network equipment may damage or destroy the equipment.