EMP-Proof your Shelter's network communications!!
Survival shelters that are designed to be proof against EMP (ElectroMagnetic Pulse) are generally constructed of culvert pipe or welded steel plate. When properly assembled, they offer excellent protection for internal electronics against EMP. There are conditions, however, that can lead to protection failure, and the entrance of EMP forces to the interior of the shelter, or into devices within the shelter.
EMP energy can propagate in lengths of wire longer than 30 inches. Power leads, antennae, copper-based communications cable (such as telephone wires, CAT-5 computer network cabling, signal wires), ground straps and any other types of linear metallic devices and conductors can defeat your EMP protection if they penetrate the shell of your shelter. These lengths of metal provide a path to the interior, and can destroy the equipment within - including PCs, radios, solid state controls, appliances with embedded computer chips, etc.. Proper disconnects designed in-place will protect these devices.
Some people would like to have CAT-5 communications with devices or people outside, without worrying about EMP intrusion via cabling while the equipment is in use.
There is a type of device that converts CAT-5 copper-wire computer network cabling into fiber optic cabling. Fiber optics are made of glass, and are impervious to EMP energy. Fiber optics can make communications through the shelter wall perfectly safe.
Here is how it works.. Your internal device, a PC for example, is used to interface with a camera located outside your shelter, perhaps 75 yards away on a hill. With a regular CAT-5 cable, your PC is vulnerable to surges, shorts caused by weather and rodents, and EMP. Using a Media Converter, your signal is converted into a fiber optic signal transmitted by glass cable, to your camera. At the camera station, your signal is converted by the other Media converter back into CAT-5 for use by the camera. Data transmission is two-way and real-time.
Any device that you want to communicate with via standard CAT-5 networking cable, such as...
cable modems for internet access,
home network for connections between shelter and house,
internet or IP-based cameras,
devices designed to be controlled (but not powered) through CAT-5 cabling
.... .... .... can make use of this device.
The media converter's specifics...
Maker: Allied Telesyn
Power: 12 volts DC, 500ma, via standard 120v wall adapter, or a direct 12 volt source. (It will run directly off your shelter's internal 12 volt system!! No outside power required with that setup.)
Its features include:
Fiber Link Test to verify the operation of the fiber optic link connection. This helps in determining if the fiber link is failing, or if the CAT-5 cabling is a problem....
Plugable Tx and Rx sockets for fiber connections...
MDI or MDI-x up-link capability for use with network switches...
Indicators for Receive, Link, Power and Normal conditions...
Use a pair for each external link you require. If you want to risk it, you can use just one pair, with an outside network switch, to communicate with a whole range of devices external to you shelter. However, I recommend one pair for each device for survivability. Power to the Media Converter on the outside can be protected via a battery system and leads shorter than 12 inches. Keep CAT-5 lengths on the exposed end to the shortest length possible. If you wish to install this setup for post-attack usage, keep all connections in your external "pod" disconnected, but ready for reconnection via a pneumatically operated re-connect system. Use compressed air through plastic lines to activate a switch block that reconnects your devices. With this setup, you can maintain EMP protection before the attack, and during operations later in the event of a second attack.
On the net, you will find these sold singly at $92 to $108. I have a limited quantity available, and will sell them in pairs for $150 ($75 each). They ARE used, but tested and operational. They came from an environment that was operational for several years, and were discontinued due to the closure of that location. I will certify that they are operational at the time they are shipped via testing at my location.
My own shelter, due to be installed later next year, will make use of these for discreet camera security, communications and possible intrusion control via remotely controlled "pods" some distance away. EMP protection is something all shelter owners need to be prepared to defeat. This is one way to protect information gathering - which will be key when the Shumer hits the fan....
If you are intereted, post here.