What To Do With Old DSL Modems? 176
"Details:
My tale of DSL woe: I was an early DSL customer in Houston, and had an ADSL line from PDQ.net for a year and a half using an Alcatel DSL modem (#1) before moving to Atlanta. In Atlanta, I signed up for PhoenixDSL which used Northpoint to provision an SDSL line for me using a 3com modem (#2). Then Phoenix's business was bought by Megapath, who then sold the consumer accounts like mine to Telocity.
I was migrated by Telocity two months ago, and they sent their own "Telocity Gateway" (#3). Of course, when Northpoint kicked the bucket, my Telocity connection went down. After four weeks of stringing me along (including promises to have me back up in three weeks), they've just informed me that they can't provide me service through an alternate provider, so I'm on my own and have yet another useless (?) DSL modem. Turns out that BellSouth is the only other DSL circuit provider in my CO and their DSLAM is full so they won't be able to service me until October at the earliest. AT&T's here installing a cable modem right now. So what can I do with all this DSL stuff? From what I've experiened, most DSL providers provide their own equipment, but is there a market for used modems? The Telocity gateway looks hackworthy... I remember reading somewhere that it runs Linux internally, and there are some interesting ports and markings on it (like "for use with X10 modules"). Has anyone torn into one of these things?"
I also have 3 modems (Score:1)
USB DSL Modem under Linux (Score:1)
Libertarians! (Score:1)
Re:Do not hack these things! (Score:1)
Re:Build your own DSL links. (Score:1)
Re:Not to nitpick, but... (Score:1)
Besides in a world where people call their computers "the hard drive", any little thing that doesn't confuse the lusers helps.
You could probably run NetBSD on them. (Score:1)
Alternative Uses (Score:1)
Re:But only one person needs an ISP MOD UP!!! (Score:1)
Re:Beowulf cluster of these? (Score:1)
Do what is done with every other piece of hardware (Score:2)
How about interfacing the modem to your toaster for the ulitmate net-connected toaster (which we all long for).
Donation? (Score:2)
Re:ebay, ebay, ebay (Score:3)
Perhaps people were fed up with poor customer service and dumped Verizon. Other poor bastards see this service advertised and hop on.
This is not a troll, Verizon has serious customer relations problems.. Not to mention problems with overselling bandwith and not caring that their customers are suffering.
You should've leased! (Score:4)
If I bought it, I'd be stuck with an obsolete modem now.
Never buy NEW tech if you can lease it.
Re:Build your own DSL links. (Score:4)
Build your own DSL links. (Score:5)
Re:Build your own DSL links. (Score:5)
Fun with DHCP! (Score:5)
Auction sites, and other ideas (Score:4)
P.S. I'm looking for a new job in Web Development. I invite you to check out my portfolio [vt.edu] of hand coded HTML / JavaScript / CSS.
Alex Bischoff
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Cisco 675/Qwest (Score:3)
I'm located in Denver and I'm about to move to a location where it's quite likely that I will not be able to get DSL through Qwest - but I have it now.
The modem is a Cisco 675, does anyone know of any cool hacks for it? I'd like to turn it into a regular router if I can't get DSL - I already know I can have @Home. I'll probably get both if DSL is available (backup) but would like to have a plan for this modem otherwise. Qwest pretty much gives them away here, so I don't think reselling is much of an option.
I hate to see perfectly useful hardware go to waste, though.
Re:Build your own DSL links. (Score:2)
There are four wires in a T1, not four pair.
Yes of course; I thought in terms of individual wires and wrote pair. duh. :-)
You'll connect the transmit pair on one end to the receive pair on the other, and vice versa.
Check.
The thing that you are missing is that one end needs to provide clocking for the other. Be default, they expect the telco to provide the clock on the line.
Yeah... The problem with these Adtran HTU-Rs has no option to generate clock. I guess that's why they have the HTU-C.
I'm not sure which Adtran box you are using, is it a normal csu/dsu? The cable lenght settings you are talking about are for LBO, the distance between the telco mounting and your CSU.
The cablelength options were just off of one of my Cisco AS5248; it's an access server with a couple of internal CSUs. I'd have to hook up the Adtran units to see what they have again. :-)
Thanks for the info, I'll take another look and see if I can't somehow convince one of these remote ends to generate clock. Thanks for the info.
Re:Build your own DSL links. (Score:4)
You can do a similar thing with T-1s, just get 2 dry pairs and wire correctly.
Incorrect. T1s require a head (CO) end and a CPE end. I have a pair of Pairgain HRUs and they do not work together. One end needs to clock the other and (optionally) power the remote end. I got away with powering them with 120VDC (just rectify the AC line and it works well) but the ends can't communicate since one isn't a CO end. It would be nice though. :-)
I do do SDSL stuff all the time though; it works VERY well. Especially out here since our trunks use larger wire and you get just a little more distance than what's spec'd. :-)
Re:Do not hack these things! (Score:4)
Wrong. You learn by getting trained by authorized professionals who know how a piece of hardware works. That way you also get a certificate showing to your potential employer that you really do know about something.
I'm afraid it's you who is wrong. I don't know how your post was moderated as insightful but that's the moderation system for you. The original poster was correct in how 90% of people learn things. They go the formal education route only to get a piece of paper or, more commonly, if they really don't want to learn but have the paper that says they do know.
Here's a fun excercise: pick a company or a field of endeavor. Count the number of degreed people who actually know what they're doing compared to those who don't know anything. Now count the number of people who have no degrees but know what they're doing and compare to those without a degree and know nothing. What percentage of degreed people know what they're doing compared to the percentage of non-degreed people? The answer is surprising if you haven't done it before and the explanation is simple: The degreed people got in because of the paper and maybe because they know what they're up to, while the nondegreed people can't get in if they don't know what's what.
People with degrees usually fetch a higher starting salary but after a few years the wheat is seperated from the chaff and the smart rise above, just as they do in practically everything. If you know what you're doing and can't get ahead, leave and find another company with clueful management. If nothing else you'll find out for sure if you know what you're doing or not. :-)
My career is relatively new (in its 7th year) but I have no need for that piece of paper saying I know what I'm doing. I'll get my degree to fill in holes in my education but aside from that... it's practically useless. The headhunters and subsequent interviewers I run across want to know is what I'm doing in my current job and what I've done before, not what I learned in school.
I've never said that doing it on your own is easier, but it was certainly the best route for me. I hear that places like Germany always refer back to your education no matter what your experience, so this post is definately geographically-tied.
Re:Build your own DSL links. (Score:4)
T1 is just a 1.5Mbps digital pair in each direction. All you need is a cross-over cable to connect two CSUs back-to-back.
Hmm... okay I'm using HDSL "T1"s here -- perhaps that's my problem.
There are four pairs, T, T1, R and R1. I cross-connect them and nada. I try various combos and while one end sees the other they both indicate that both loops are down. Also neither unit can configure the encoding or framing. The smarter of the two units has a serial port and all settings are only settable from the remote (i.e. CO) end.
The problem with doing T1 over dry pairs is that you can't go very far at all - that's how telcos justify the big $$ for T1 - they have to install repeaters.
Depending on how far you classify as far... An HDSL T1 will reach farther than any HDSL2 circuit simply because it's over two pair and can be a little more lax on transmit and more sensitive on receive. A quick check on one of our AS5248s shows the short cablelength provisioning gets us to 655ft. Not terribly long, you're right.. I thought it was longer for the short cablelength. :-)
These days, telcos minimize the use of repeaters by using broadband (HDSL?) from the CO to your NIU.
Are standard (i.e. the true T1s still available? These Adtran units are HDSL T1s and can indeed be used with repeaters.
Has anyone ever ordered a dry pair from Pacific Bell? I tried once - talked to a dozen of those numbskulls and none of them had heard of it.
When we order ours from Bell Canada we went though hell the first time but the rep was nice enough to tell us that in future, just ask for a "Class A Signal Channel" -- and to make sure to have it installed with no taps or coils. If you're not getting a signal keep pestering them -- one of our loops had coils on them that (supposedly) weren't on any of the line drawings that the techs had access to.
Re:Build your own DSL links. (Score:5)
You're right about bandwidth charges but I think you're way off with blaming "shitty dry pair DSL" with quality. I spec Pairgain Megabit Modem 300S (2.048Mbps full duplex) -- they aren't rate-adaptive but rather use a little selector-switch to set the WAN speed. I have yet to have a single problem with them and we've got over 25 pair in service. Link speeds are better than spec (our area has larger gague wire trunks than standard) and it just never goes down. Far better than Wireless if you ask me. We had a competitor to the north set up most of his links in the winter and when spring came everyone's link took a big shit. Not to mention humidity effects.
BTW: ALL DSL works over dry copper aside for the g.Lite implementations which are piggybacked on top of a regular phone line.
Don't use the alcatel (Score:2)
New Zealand (Score:4)
However, I've heard that DSL modems sold on trademe [trademe.co.nz], a
Sell them to the UK (Score:5)
telco (BT) try to force everyone to use crappy
USB modems which hardly work (they draw something
like 500ma off the USB bus, which means they have
to be the *only* device on the bus... if they work
at all).
As long as it's smart enough to do PPPoA (no PPPoE over here) there's someone will pay for it.
Someone mentioned this.. (Score:5)
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Re:Build your own DSL links. (Score:4)
These have been available for decades, and aren't anything special (per requirements of simple-is-better alarm systems).
A couple of years ago, I helped a friend of mine set up some always-on connectivity between his house and his business using a pair of decent modems, and an Adtran line simulator. Which, incidentally, don't seem to be called what they are, either - the telco folks seem to know them as "Ring Generators".
But only once person needs an ISP (Score:2)
I wanted to also bring up the possibility of one person having an ISP, then distributing that bandwith among a number of friends.
I have both a cable modem and DSL line at the moment, it would be great if I could distribute some bantwidth to some other friends houses (assuning they live close by).
Re:Build your own DSL links. (Score:2)
There must be something missing from your description - a T-1 for $15/mo is too good to be true.
Re:Build your own DSL links. (Score:2)
My problem here is that I'm too far (around 18,380') from the CO for my local phone company to qualify me for an ADSL connection, even though I know I should be able to get decent speed up to at least 20,000' or so... IDSL is just too expensive as well as not particularly fast.
Would I be able to just order one of these "alarm circuits", add my own DSL modem, and connect to my ISP that way? Would my ISP need to do anything special to handle me as a DSL customer this way rather than using "official" DSL from the phone company?
Thanks for any educational insights!
Re:Build your own DSL links. (Score:2)
Re:Build your own DSL links. (Score:2)
Useless Northpoint modems stretched end to end... (Score:3)
Powers of Ten [powersoften.com] or The MegaPenny Project [kokogiak.com] with DSL modems is no good for landfills. Scary part is how small these things are, and how many larger devices are tossed out every year.
Joe Maller
www.joemaller.com [joemaller.com]
I don't know about other models, but.. (Score:2)
Verizon previously used Orkitt modems and when I moved and they switched, I made them let me trade in my Orkitt for the Fujitsu; so I didn't get stuck with an old modem. I did, however, get a nice source of heat in my apartment during the winter...
Orckit (Score:2)
Sell it, or hack it. (Score:2)
So I bought a different modem on Ebay. Most DSL services these days use standard protocols, so the modems will work happily with other services. Many services charge users $300 for the modem when they sign up. If you have your own, you save that money. If you buy one from Ebay for $50, you save the remaining $250. Many ISPs toss in the modem, but not all.
Also, the speedstream is a 50 MHz PPC, and both the system firmware and "boot firmware" is upgradeable. Now that I've finally replaced mine, I want to try using the Embedded Linux PPC boot project [sourceforge.net] to try to install linux on my modem.
Re:G.lite doesn't extend the distance at all... (Score:2)
Re:Telocity dsl router.... (Score:3)
If you know that information its actually pretty easy to get it booting Linux.. there are only a few ways those things are wired up internally.
4 MB Flash and 16 MB ram is more then enough to do something fun with it. Also if the 2 rj45's are wired directly to the CPU (depending on the PowerPC) you may be able to do ethernet on both instead of DSL.
Also the WindRiver bootloader, is very easily "adjustable" to load something else..
--Mark
Re: (Score:2)
Re:How did these things get called modems? (Score:2)
Surprised to hear this... (Score:3)
I work for a company that makes CO DSL equipment (not Alcatel) and am involved with testing a wide range of modems against our equipment -- including many of the modems you folks have been griping about. I would have thought that the providers could be more flexible about what modems to choose. I guess it is too "dangerous" or too difficult to support this way. Don't think there is really a huge technical reason though... as long as the CO side is ANSI or G.DMT (or lite) compliant, most modems will fall into these categories.
I had hoped to see DSL turn into something a little more like 56K modems... guess I'm too naive...
Re:On old modems... (Score:2)
Re:You should've leased! (Score:4)
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Re:Fun with DHCP! (Score:2)
I took one of my old DSL modems along to a LAN party as they needed a DHCP server. After a bit of stuffing around I got it sorted.
Unfortunately my settings were a bit crappy, having still got my home network information in it, so I stuffed the entire network much to the anger of the people around.
Anyways, I got it all sorted eventually.
What can I do with 4MB of flash RAM on this baby? Hmmm.
Re:Cisco 675/Qwest (Score:2)
Re:Telocity dsl router.... (Score:5)
Trying 10.5.1.2...
Connected to 10.5.1.2.
Escape character is '^]'.
HTTP/1.0 504 N/A
Connection: close
Server: Expressway WindWeb/1.1
Date: SUN APR 29 09:13:53 2001
Content-Type: text/html
Telocity Expressway Web Server Error Report: V1.1<HR>
<H1>Server Error: 504 N/A</H1>
Operating System Error Nr:3997700: errno = 0x3d0004 <P><HR><H2>URL parsing error
</H2><P><HR>please mail problems to support@telocity.net <A HREF="mailto:support
@telocity.net"><ADDRESS> Telocity Communications Inc. 10355 N. De Anza Blvd. San
Jose, CA, 95014-2027</ADDRESS></A>
Connection closed by foreign host.
A google search leads to Wind River Systems (http://www.wrs.com) and implies that the modem is running VxWorks, not Linux (as the article submitter implied).
General uses for hardware that you don't need anym (Score:3)
Just think but..... (Score:2)
I can see some uses for this things. If another person who has one and his burns out they can use it, even if you can't. I personally can't believe that some of these have PowerPC chips in them. I'd rather have that chip in a RS/6000! :)
Re:Build your own DSL links. (Score:2)
2. You can sure as hell get a set of copper wires for ~ $15/month, depending on the distance and area. Browse your telco's website and look for tariff circuit rates.
3. You're right, the phone company hasn't run a wire from your house to all your friends' houses.
4. What they did instead was build a structured cabling system so they connect point x to point y with patch cords. This is what you buy for $cheap.
5. Despite the original posters claims, you *can* run a T1 with 2 sets of premises equipment, provided at least one of them will supply a clock. Most do. These days you can get them for $cheap.
6. Depending on the quality of the circuit, expect to achieve 5000-6000 feet.
7. Want to go farther? Find a friend who lives closer and install a T1 repeater (also $cheap) in his garage. Then buy another circuit to the next location.
The most obvious solution... (Score:2)
Re:Build your own DSL links. (Score:5)
Yes two sdsl modems will work back to back. I am pretty sure that adsl modems will work in the same way. There is somewhat of a standard for cell based sdsl modems so there is a chance that two different brands of sdsl modems will work together. The only problem is that you have to make sure that the VCI is the same on both, which pretty much means you will have to configure them yourselves... Don't expect them to work out of the box or with the config that your provider put on them.
In order for this to work you and the other party have to be out of the same CO. You can order PADA circuits to both partys and have them cross connect them at the MDF. As far as I know there is no way to do this between COs as telcos stopped running straight pairs between COs a long time ago, and NO you cannot just get switched through the voice network. The POTS network or even the ISDN network cannot handle the frequencies that DSL works on which is why DSLAMs and DSL was ever invented.
You also gotta make sure that the telco doesn't put load coils or ringers on the circuit. I have seen this happen even though our order specifically said not to put these things on there. How do you check? Use a TDR box. Also you have to make sure you never tell them you are using them for data. These circuits are suppoesed to be for alarms and there may be laws that are being broken here.
Your max throughput would be 2.3Mbit, depending how you set up the modem, the model and the distances involved. Oh, and don't try to use any type of map to guage the distance, the telcos rarely take the shortest path to the CO. How do you know length you ask? Bust that TDR machine again.
The circuit is not full duplex and not even really aggregate, which is weird. I would guess with two transfers in each direction you would see about 1.3-1.5Mbit both ways.
Oh, and if you are served off of a DLC you can just forget this whole idea, unless you want to drop a hardened DSLAM into your DLC.
Does all this sound like a lot of trouble? Imagine all these problems and variables times 10000 and you can imagine why (insert this week's defunct DSL provider name here) went out of business.
Sell it on Ebay (Score:4)
Re:Build your own DSL links. (Score:2)
Re:Sell them to the UK (Score:3)
Re:Build your own DSL links. (Score:5)
No ISP is involved in the scheme AC suggests, so there would be no bandwidth costs. The theory is that you pay the phone co. for a dedicated line between, say your house and your next-door-neighbor. They don't care what you do with it. Presumably, you and your neighbor can then make your 2 DSL 'modems' talk to each other since they're the only things on the wire. (btw, it's not necessarily a physical wire running directly from you to your neighbor, but routed through the phone co. system
I don't know that DSL modems work that way...it's not like hooking up your 56k. I'm just trying to clarify the proposal.
Re:Build your own DSL links. (Score:2)
I can't say the last time I actually saw alarm wire pricing from a telco, but in this area (Detroit) it used to be $11/end
Telocity dsl router.... (Score:5)
any people with info on this interesting piece of hardware with alcatel power please, do post it!
Re:Libertarians! (Score:3)
That's right, by the Government! It was the government who originally created the telco monopoly, and now they're "saving" us by giving us deregulation. It's been said [connect.net] that "The government is good at one thing... it knows how to break your legs, and then hand you a crutch and say 'See, if it weren't for the government you wouldn't be able to walk.'"
--
Re:Build your own DSL links. (Score:3)
The trick is either to have friends at the telco, or social engineer your way into them: "Hey, it's John from telco corporate headquarters. Just spoke with Peter at the city center CO about a problem a customer had with his line; seems you installed coils. Please do something about it".
I know an ISP that pulled this trick in the early days...
ebay, ebay, ebay (Score:5)
Word to the big bird.
sounds a lot like my plight (Score:4)
Around June of last year I signed up for 416k SDSL from PSN and was happily downloading everything in sight until December 30th or so when my line went down. Later I found out that PSN would be going out of business on the 17th of January and they'd be migrating me over to Telocity [telocity.com]. They gave me an estimate of about 7-10 days to migrate. It took them 3 months (during which I had no internet access at all). A week after they got my connection back Northpoint went out of business and their network went down. Telocity sent me an email telling me that I'd be serviced through Rhythms now and it would take around 3 weeks to migrate over. About 3 weeks after that email I got another email from Telocity telling me that they didn't have anyone that could be my last-mile provider. I promptly canceled my Telocity account and called Time Warner and signed up for Road Runner. They set it up the next morning and I've been going strong for a week or two now.
DSL was really a nice service and I wish I could've kept it. It's really getting killed by the distance limit. BTW, when is G.Lite supposed to be coming around? If I'm correct, that extends the distance that DSL can go and it'd make it cheaper to provide. That could really be DSL's savior.
And Then...
Internal models ... but rare (Score:3)
Well, if you have one of those rare internal models you maybe able to contribute it to someone making drivers for Linux for it.
Since there probley external, search the net for hacks on them. Maybe do some blind reverse eng. on it.
Last but not least, you could also take out your frustration on DSL providers, and use it for target practise. I think its safe to say, a 12 gague sluge would rip it apart nicely :)
until (succeed) try { again(); }
Re:ebay, ebay, ebay (Score:2)
Re:ebay, ebay, ebay (Score:3)
Re:Build your own DSL links. (Score:2)
Hardware Info? (Score:2)
altjough what we would really need would be the service manuals for the things so that we can verifiy functionality.
I would be really ticked if it turned out to be something like, "well you can only use 3com routers with your 3com ethernet cards" - ie - merely marketing hype to lock you in to their hardware, which is probably just a generic OEM with branding on the outside.
these things need to be as well documented as regular dialup modems used to be.
Check out the Vinny the Vampire [eplugz.com] comic strip
Re:Build your own DSL links. (Score:2)
Re:Build your own DSL links. (Score:2)
Standards in RADSL (Score:5)
CAP (Carrier Aplitude Phased)
DMT (Digital Multitone)
G.Lite
For RADSL service to work the DSLAM that you are connecting to and the modem that you have need to be using the same line encoding. If you check with your local provider and find out what line encoding they are using, you should be able to use any modem that uses the same line encoding. CAP is going away but DMT and G.Lite are going to be here for a while.
Re:G.lite doesn't extend the distance at all... (Score:2)
I'm not sure what you meant in your second question, but if you had a dsl connection on your inside and outside pairs, if you picked up a phone on one, it shouldn't effect the other much.
On old modems... (Score:5)
While I can't say much because of confidentiality matters, I can say that those three companies- Alcatel, 3com, and Telocity- shouldn't give you any trouble on other systems. Only three settings really matter- VC, VP, and protocol, and if you can figure out how to set those, you're golden. There are companies that don't interoperate worth shit (one company sent us 5 different modems, one for each DSLAM they wanted to test against. I guess they missed the 'interop' part in our lab name), but in general, if a company tells you that you need to buy their modem, they're either lying or using crap for equipment.
Incidentally, while there are about 80 vendors for modems, there are only about 5 different chipset makers. You do the math
G.lite doesn't extend the distance at all... (Score:5)
1. You don't have to install a bandwidth splitter, so the company doesn't need to send a truck out- they can just send you the modem. This saves big bucks for the phone company.
2. They have fast retrain, which means that when you pick up your phone to make a call, the DSL service is re-established in less than 2 seconds. Picking up (and then hanging up) your phone drastically changes the characteristics of the line for a moment, and DSL connections can't stay established through a transition like that.
Other than that, there's no advantage to G.lite- it suffers from the same distance limitations. You could say you get full rate G.lite for a greater distance than normal ADSL (G.dmt), but that would be misleading, because full speed for G.dmt is around 8 Mbs (theoretically 14 Mbs), while G.lite is 1.5 Mbs. With respect to distance, when the max rate for G.dmt drops to the max rate for G.lite, they both start to lose bandwidth at about the same rate.
Another slight difference is that G.lite can only be used in the interleaved channel, while G.dmt can be fast or interleaved. Interleaved uses a more involved trellis coding and error correction than fast channel, and therefor gets higher data rates at greater line lengths. At lower line lengths, it gets lower speeds than the fast channel. Also, Fast channel has lower latency (but they're both so low, you shouldn't notice the difference)
If you want to check out the site for the lab I work at, go here: http://www.iol.unh.edu/consortiums/ [unh.edu]
Re:Another question on it... (Score:3)
If you're out in the boonies like I am it's cheaper & more efficient to get 3 - 4 phone lines into an extra box, than getting the only other options, DirecPC (horrible pings) or the new 2 way Dish ($700 to start then $70/month 400k up 128K down). DSL & Cable won't be an option out here for another 5 - 10 years. The best thing is, my ISP is multi-link and they don't seem to realize it (or care). I know 5 people using the same dail-up account and I've seen/chatted with at least 3 of them at the same time. I don't think they ever check their logs either, this has been going on for years....
Jaysyn
Articles like this... (Score:4)
"Work expands so as to fill the time available for its completion."
CD-Rs & AOL disks & DSL modems, oh my! (Score:2)
Kurdt
Another question on it... (Score:3)
I have a Motorola 3682 phone from PCS One (a local company which uses VoiceStream, formerly Omnipoint). A friend of mine works at the place, and "unlocked" my phone, so I can use it on any network.
Now, I have a CopperRocket SDSL modem from DSL.net...does it possess the same "lock codes" so that it won't work with another DSL provider?
While you could call my old 56k "an obsolete piece of junk" now, I could still use it with whomever I want.
WARNING: TELOCITY MODEM OWNERS (Score:2)
Re:Build your own DSL links. (Score:2)
we borrow them only.. (Score:2)
and BTW: excuse my english, i hope my comments is understandable..
ha det,
Platy
got an idea (Score:3)
we can make olds DSL modems useful by getting DSL in my area
no, but seriously speaking: you can open it up and use it to hide your drug stash...who's going to look there?
Re:Build your own DSL links. (Score:2)
Re:Build your own DSL links. (Score:3)
eBay (Score:3)
My roommates and I accumulated a few modems that we got for free when switching ISPs. We sold them on eBay. If I recall, the last one fetched $120+. I'm sure with enough hacking you could make the status lights blink to the beat of your MP3s or something like that, but I doubt you'll come up with anything as nice as the feel of $400 in your pocket.
Sell them in other countries (Score:3)
Social Engineer Your Way into an Exchange (Score:2)
Re:Check your facts first...... (Score:5)
Don't know about you, but a device that modulates multiple analog frequencies for upstream and downstream communications is called a MODEM [modulator/demodulator] in my neck of the woods! ADLS does this as does Cable. It's a modem that has a different frequency range, and tries not to step on either your existing voice range or cable TV range.
Hint -- That's why you only need one line for DSL and phone. Between you and the CO you can utilize far more frequencies on the UTP wire than the PSTN will allow thru the switches. Once your signal gets to the CO, the DSLAM creates a real digital stream [de-modulates the analog signals]
See these links for a good overview of ADSL technologies that Communications Systems Design published a couple issues ago:
Part I - ADSL Physical Layer [csdmag.com]
Part II - ADSL Handshake/Upper Layers [csdmag.com]
Your nitpick is correct with ISDN, but incorrect with ADSL. ISDN is a truly digital signal, and the CPE devices are called Terminal Adapters. Perhaps HDSL and IDSL are different, but ADSL and Cable technologies are not true digital signals to/from CPE......so the devices are called modems. ISDN is pretty much dead, but I seldom hear folks call the CPE device for ISDN a modem.
Sounds like guilt free hacking to me (Score:2)
But more than likely they are useless. Gee - maybe if some providers start offering cheaper DSL with used modems they won't go under as fast LOL
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Re:Do not hack these things! (Score:3)
As for careers, there are three obstacles in the path of those who know their stuff but don't have the "right" certificates. One is employers that don't know how to tell if you know the job or not; without the certificate, it can be difficult to get in the door and get the opportunity to demonstrate by doing. Second, large corporations are often so bound up in red tape that even if the manager knows you are the best man for the job, he can't hire you for it -- or so idiotically managed that they don't know who is doing a good job. Smaller companies are much more flexible, but also the pay scales are usually much lower. And finally, the 4-year college degree is used by American businessmen in much the way knighthood and orders of nobility were used in medieval societies -- a quick way to distinguish the gentlemen from the riffraff.
Re:And this is why the cable companies are gonna w (Score:2)
Almost true. My brother/parents have RoadRunner at their house, and the IP changes every 3-4 months (I think, maybe even more infrequently than that). I believe it changes when they have to do some sort of server restart or the network goes down. But, he has been able to run a server off of it using Linux, dyndns.org (to assign a name to his 'dynamic' ip address automatically), and some ingenuity on keeping a firewall and masquerading on all the time so they don't know he's running a server. After using Ameritech DSL and being on my brother's network during LAN parties (which can really hog bandwidth), I'm sold on cable. Ameritech DSL sucks (and yes, they do use crappy USB SpeedStream DSL modems), and I've never noticed a real slowdown that lasted very long (no more than 15 minutes) on RoadRunner.
Don't get rid of them just yet! (Score:5)
True, they don't go much for ebay anymore. What I paid $70 for goes for about $30-$45 now. Everyone sees the new models with the higher speed ratings, and some people question compatibility. I'd be willing to bet the older ones work fine. Besides, how much speed do you really expect to get with the basic level of service?
Anyway, the point I'm making is with so many DSL providers providing Windows centric modems (thus, I choose cable, seeing the rotten state Pacific Bell was in) they are of atleast SOME value to users of UNIX workstations/servers.
Open Source/ Open Hardware DSLAM (Score:2)
SDSL back to back bridges (Score:3)
And this is why the cable companies are gonna win. (Score:2)
Re:Libertarians! (Score:2)
"Deregulation" is primarily just widening the contractor pool in some limited ways. Problem is, the 'universal service' part got left out somewhere along the way. Which is good in some ways because built-out areas are no longer subsidizing new suburban construction, but also not so good because big industrial users (say in California) can jigger the system to get priority access to resources (say electricity).
Some of them are just routers (Score:5)
The Problem (Score:2)
Re:But only one person needs an ISP (Score:4)