jimbob

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About jimbob

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    I broke 10 posts and all I got was this lousy title!

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  1. A T1 uses for example TDM which is a dial up technology derrived from how to stuff 24 chans down one copper pair. Hell a T1 is just a bundle of 64k DS-0 lines (23 bearer and a delta for signalling making it a big ISDN service and ISDN is dial up technology (unless you tell me otherwise ;-) ). Therefore T1's(e1's ....) use dial up technologies. xDSL draws on dialup technology too. Dont believe me? You only have to look at radius, ppp, modems (and in some instances like IDSL) signalling protocols. The dialup in v90 was you dialing a string to create a ppp through your telco's network to your ISP. The dial up in xDSL is creating your virtual ppp link via your telco to your isp. Dialup is using the pstn to move data on behalf of the end user. Dial up technologies are anything which has been devoloped to allow that movement of data. So its not that they communicate with the isp either.. its the way in which the communication is established and carried out. Edit: spelling.
  2. and unless the images are logos of major banks! smells like trout
  3. Dial up technolgy doesnt mean it is 'dial up' in the sense most people think of it (i.e. analogue modems). For example a T1 line, which uses fundamentally dial up technology can be presented on fibre optic cable - so copper, fibre, air.. dial up technology is used.
  4. Like I said xDSL is dial up technology.. uses isdn signalling etc so its far from bleak!
  5. Sorry fella am in Hampshire myself
  6. Not being funny but fark that. The future for dial up is heavy compression techniques to boost dialup speed. http://www.usr.com/propel/p-propel.asp however ive not used it.. 56k is theoretical limit and is related to the way the voice sampling takes place iirc. Most copper to peoples homes is very poor quality too and doesnt handle high speeds well. btw: dont forget dsl is a dial up/modem technology too.
  7. You should have spoken to the network admin before installing the program really.. you have to admit that. If you have/had a legitimate use for the network then they'd be only too pleased to help you out -after all legitimate use is what they are all about. I'm not sure if sorting your ebay site from school counts tho. Since you didnt speak to them and did it behind the scenes makes you LOOK guilty of something as you appear to be trying to hide it. Still.. you're at school to learn and youve just learned about breach of IT policies (written and implied) ;-) That will stand you in great stead when you have to live by your employers it policy at some point.. see how kindly most companies take to circumventing firewall policies!! Security guards are not as easy to get around when they're hauling your ass off site. Employers really do you over.. thank god your at school.
  8. Apart from this being a very badly worded question i.e. all your requests for internet DNS, ISP DHCP (possibly) web page requests etc etc are going past a router. I'd hazard that you are going past a router to get the the router you are trying to get past ;-) They route traffic! Unless everyone was on the same flat lan we need routers. Or layer 3 switches. But that aside.. Since routers are configured to allow certain traffic though predetermined routes, that is something which could be exploited with investigation. It sounds to me like this is a firewall or some sort of access list? Either way you might find injecting some packets and watching results. For example if someone blocks icmp pings they may allow udp? As soon as your packet has switched WAN to LAN you have theoretically have got 'past the router'. well done - depends on what your goal is. Also see how it responds to flavours of RIP, BGP other igmp packets If its a higher end router such as Cisco, Juniper, Bay, 3 Com, Extreme et al then try connecting via telnet and using default usernames and passwords (can be easily googled). A lot of modern routers also have web interface access and are snmp enabled cause admin loves there monitoring stations, but often this is done OOB. Hope some of that helps.
  9. .. or are they going to pull fibre through the existing pipe network? need more info
  10. Thinking about this sensibly, I hope it falls on its arse... The broadband-over-powerlines idea is a disaster in itself, in the few places where it's been tried it's destroyed FM, TV and DAB transmission, never mind the piddly little signals of ham radio, 802.11 etc... and the radiated chaff from UWB transmission through gas mains wold probably be just as bad ( Broadband over gaspipe has a humourous sound to it, too - considering that most gas mains laid nowadays are polythene, what's the propagation medium? There were proposals to run parallel balanced feeders down it by sticking a ribbon cable to the inside, but would that mean replacing all the existing piplines? Are they proposing to go back to metal piping (with all the risk of fractures etc that poly was supposed to obviate) just to make a few quid on the last mile? There was also the issue that local lightning strikes would induce high-voltage arcs between the ribbon wires... nice in a flammable medium, where the risk of air contamination is treated seriously enough to fit gauze flame arrestors inside the meter! I wonder if I should try to get a patent on Broadband-Over-Waterpipe? If people didn't mind a few "additives" in their drinking water it might just work... and the "alternative" folk could be persuaded if you told 'em it was a spiral electric field going up it...
  11. Dont believe the hype ;-) Belkin have tried to pre empt the market by releasing their own proprietry N standard. The problem is that there is no ratified N standard at the moment and there are 3 pressure groups with different strategies of how to achieve the extra range/bandwidth all fighting out amongst themselves. One thing you can be sure of is that the final ratified N standard will not be compatible with Belkin's pre N equipment. A similar thing happened with 802.11g (i.e. people released pre-g equipment) but the standard was finished and awaiting ratification so backwards compatibility between G and pre G wasnt so much of a problem. On a side note, do not bother with the pre N stuff as it is as flakey as a snake with excema. Do a google on belkin pre n problems and youll see rafts of caveats - so much so that Belkin are replacing units for people no quibble. One chap on a forum I read had 4 new units from belkin before telling them to stuff it up their bums.
  12. In the US the FCC allow an output power of 4 watts eirp including any antenna. This should allow 1/2 mile (0.8km) range. According to ofcom.org.uk the restriction is 100mw eirp in the UK which strikes me as rubbish considering the surveys Ive done around my area. Its a different tack, but would be interesting to find out what some people are outputting and getting them to turn it down if you are getting lots of interference. Or reporting them to the authorities and see what happens... Range is governed by power output, height and directionality of antenna and environmental conditions so a definitive figure is hard to come by. Power output is controlled by whoever controls radio frequencies in your country. I believe there is a difference in power allowed on point to point connections compared with point to multipoint. Links: http://www.cisco.com/univercd/cc/td/doc/pr...300/25eucfg.pdf http://www.ofcom.org.uk/ http://www.rflinx.com/Support/Calculations.htm