Hackers

Comparison of Twisted-Pair Ethernet Cables

 

  • UTP - Unshielded Twisted Pair
  • STP - Shielded Twisted Pair
    • S/STP - Screened Shielded Twisted Pair (mit einem Paarschirm als Drahtgeflecht und einem Gesamtschirm als Drahtgeflecht)
    • F/STP - Foiled Screened Twisted Pair  (mit einem Paarschirm als Drahtgeflecht und einem Gesamtschirm als Folie)
  • FTP - Foiled Twisted Pair (aka U/FTP)
    • S/FTP - Shielded Foiled Twisted Pair
  • foo

If you own an UPS (Uninterruptible Power Supply) to power devices while a power failure, you sure know time is running to safely shutdown your devices. For this reason i prefer using low-power and embedded devices which don't consume that much power so are able to run longer while the outage. According to my power-meter the sum of all devices (with modems, switches and a mini-itx server) is at about 70W. My current UPS is an APC BE500GR what according to it's battery specification is just enough to run for about 20 minutes in my situation. Never compared that directly when i bought it but actually it works for less than about 10 minutes, sure the battery suffered already after one-two years usage. Recently a friend called me, talking about his company trashing 16 sealed lead-acid rechargeable batteries, if i might be interested. Even if they might not work at all, i must give it a try i thought, to use them all toghether with my UPS.

There are neat retro products out there like the ThinkGeek Bluetooth Retro Handset or the Victorian Retro Phone Handset. Though these are really nice devices, its somehow still not the same feeling like in the old days using the original products from the past. My parents still have this "Hrabia" phone, not in use anymore but fully functional. Yes, one of the first phones used at home with a dial plate! "What do you want to do with it?" my mother asked, "Actually... use it!" i answered and thought, what if i could get it to work over voip, jumping to the past every time a phone call is made? :)

Did you read how i put a Mikrotik Sextant in a pot or how i use Mobile PoE via USB for upto 5V devices like Ubiquiti? If not, here i'll describe how to power a Mikrotik RouterBoard via PoE and USB. I came up with this idea after the success with using a Bullet on the go, so i was curious if that would be possible with a RouterBoard SXT 5HPnd too. Initially i just tried the same cable i used for Ubiquiti but it seemed the SXT doesn't get enough volts because it reboots a few seconds after powering on. Using two USB-Ports wouldnt help as this just doubles the mA, not the voltage. Simple like it is for Ubiquiti, its not that simple for Mikrotik, but with a small addition to the cable it works also to power the SXT.