albertterego

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About albertterego

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    The phorce is with me!
  • Birthday 01/01/1908

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    Under a harmless little reflection on your TDR
  1. Yes, I posted about this here a week ago: http://www.binrev.com/forums/index.php?showtopic=32323
  2. These blog entries link to an interesting article on the greek cellphone wiretapping hack. http://www.crypto.com/blog/hellenic_eavesdropping/ http://www.cs.columbia.edu/~smb/blog/2007-07/2007-07-06.html http://www.spectrum.ieee.org/print/5280
  3. Ah, that sounds like it could be the ringback/DTMF test interface. If so, try dialing 1234567890 after you get the 2nd dialtone. Does it break for a second? Also, try flashing the hookswtch and then hanging up. Does it ring you back?
  4. OK. DATU and SASS are telco loop testing systems intended to allow craft people (repair and installation folks) to do "end to end" tests by themselves from the field on subscriber pairs that would otherwise require a second person with access to the CO side of the pair. The systems are accessed by dailup (one or two numbers per CO, usually), and have a voice menu and use DTMF for input. The functions include things like shorting a pair or opening a pair for a time, putting trace tones on the pair, checking the pair for activity, listen for audio on the pair (which is scrambled for privacy), and so on. DATU stands for Direct Access Testing Unit, although I've also seen it referred to in telco documents as Dialup Access Testing Unit. SASS is a newer system. Both are/were made by Harris, and can be installed on most modern switches. Both systems are in wide use. The main reasons telcos get very nervous about unauthorized access to these systems are first, they are a relatively scarce resource -- usually only one or two per CO, and second, they are very useful for illicit wiretapping. The trace tones allow one to easily locate a target pair in a large bundle, and the audio can sometimes be descrambled relatively easily, depending on the version of the system being used. So don't screw with one, should you happen upon the dialup number for one.
  5. What on earth are you talking about? It's not illegal to discuss DATUs or any other telco interface. Hell, I OWN a DATU box (bought it on ebay in a large lot that contained a number of other CO components). Nothing at all illegal or even suspect about that. And certainly not worthy of the mystique that seems to surround DATUs Unauthorized access to a telco DATU is certainly illegal, especially so for purposes in support of wiretapping or other inherently illegal activity, of course. Maybe back in the old Bell System days it could be reasonably argued that details about telephone system architecture and interfaces are inherently proprietary, but not today. Lots of people own switches and switch hardware.
  6. I just played with this. very cool. it's like a time machine. Thanks.
  7. I think this is a medeco payphone lock. I don't think they're very easy to pick, tho I'm no expert on locks. You may be able to drill it. You'll want to use a drill press. For general information on classic payphone locks (not this kind, tho), try http://www.crypto.com/photos/misc/wecolock/ AT
  8. The President's Analyst.
  9. This will probably sound stupid, but what do you mean by "a 70s style 2500 set"? Is that a specific manufacter, or a generic term for a certain type of phone? 70's as in from the 1970's. A 2500 set is a standard western electric touchtone desk phone. It needn't be a desk phone for your purposes, but it does need to be western electric and from around the 1970's (to have the type 35 dial made from discrete componenets)
  10. For what it's worth, on the ATT/SBC DMS-100 that serves where I'm staying at the moment, A, B and C give [sIT] + "we're sorry your call did not go through", and D gives a reorder.
  11. Interesting. I've never seen that behavior before. What kind of switch are you connected to? Is it the second dialtone the same dialtone you get when you dial your local ringback (and can you break that dialtone with DTMF)? And can you record and post the tones you hear?
  12. OK, you want a dial from a 70's era 2500 set (called a 35-type dial, the kind with two toroidal transformers). You'll need a STDP switch, a 9v battery, an audio amp and speaker, and a case of some sort. You'll need to solder. I'll dig out the one I mod'd back in the day and tell you what you need to do. AT
  13. For components in small quantities, digikey.com You mentioned you have no experience soldering; I'd recommend NOT trying to mod a modern dialer as your first project. They have small surface-mount components that are VERY hard to solder to. If you're going to mod something, get an OLDER 2500 set (the kind with the big transformers on the back of the tone pad). You can mod it to add a switch that converts 369# to ABCD by cutting a single lead and installing a switch. Add a 9V battery to power it, an audio amp and a speaker, and you're done. Extra stuff to make it look scary is on you, though. I'll dig up the details on how to make the mod if you decide to go that route. AT
  14. That's definitely a classic (I remember seeing it when it first came out). It's certainly the only reference to the CNA bureau I've ever seen in a movie, and Redford's character is ex-Bell Labs. The book isn't bad, either (Six Days of the Condor), although I prefer the movie.
  15. Well, there are lots of books and web sites on basic electronics. My favorite beginner's book is "Practical Electronics for Inventors". A more advanced but excellent book is Horowitz and Hill, "Art of Electronics". All this is way more than you need to solder together a circuit, but will help you understand what's going on and also to design your own simple circuits when you want to do this stuff. I'm still not 100% clear on what you're trying to do -- do you want an acoustically coupled DTMF generator (with a speaker), or one that connects to a POTS line?