Network Racks For Surveillance Guide
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Thank you for making this. Another definitive example of the little tools I need and look for as an active participant in this industry. Security folks are equivalent to the veterinarians of all the trades; a horse, a pig, a chicken - all in the same day!
Thanks for helping us stay skilled when putting all the pieces together.
No mention of a rack KVM switch.
I love the active cooling diagram.
I'd be interested in any info on rack use in earthquake prone areas.
Tony, several vendors make seismic proof racks.
Typically, these are anchored to the floor / tiles.
Tom
I know of and use racks rated for Zone 4, but I don't really know what that means. As long as I have been doing this, I have never seen an engineering-level explanation of how they get rated, or if the equipment weight distribution matters.
In my group we assume the rack will wobble, but we've not been very good about specifying cable slack to allow for that. Didn't think it mattered all that much when everything was copper, but I can see potential issues using fiber.
Another group I work with braces the top of the rack to the wall or ceiling with all-thread to eliminate wobble. Though we have these two different standards I have no way of telling which is better.
Of course a four-post rack would undoubtedly be stronger, but they end up taking more space too, so there's a significant real-estate cost to using them, on top of the purchase price difference.
Someone somewhere has probably done research into this, but I've never come across it.
The active cooling diagram seem the rack back/front direction should be opposite. The server chassis front is sucking air and air come out from the back.
Interesting. I believe grounding the rack is required to safeguard the equipment's.
Nice article.
"zone 4" appears to mean "near an active earthquake fault", as in this. So I guess you always see racks bolted to the floor or structure.
You don't mention bend radius rules, or fiber optic cable, or wiring run rules for wiegand/rs485 cable.
(do not mash the cables. there's actually a "bend radius" rule, probably in a BICSI spec. And while cat 5 for data wants to be neat and parallel, wiegand and rs485 do better (some say) by being run back and forth diagonally in cable trays.)
I likely won't ever be involved in any type of enterprise level work, but this is still extremely nice-to-know information. Thanks!
I think it's important to note as well the door. It can be either glass or metal. Metal doors are usually meshed thus offering better ventilation. But glass doors are more convenient when troubleshooting, all device statuses/cabling is easily visible without opening the door.
We have ran into Rack Units advertised as "server sized", where the depth came in an inch or two short of the DVR, Switch, and keyboard trays. It is always frustrating having to renovate and update the structure of the rack units in last-minute attempts to make the enclosures work.
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