All posts by Briantist
Below are all of Briantist's postings, with the most recent are at the bottom of the page.
MikeP: Sorry to be picky, but if you can't make the basic distinction between the World Wide Web and the Internet, I think you're on shaky ground.
The WWW is a service that run on the internet. Client programmes (known as "web browsers") connect peer-to-peer with servers using the hypertext transfer protocol (http). The server process is known as httpd ("http daemon").
Http was invented recently, and used the existing internet infrastructure, which had come out of the US defense programmes in the late 1960s.
HTTP is what we call an "application layer" program. The other six layers of the OSI networking reference model more-or-less fit TCP/IP.
TCP=Transmission Control Protocol. which is designed to allow machines on local area networks to talk to each other, and IP is the Internet Protocol, which tells networks how to connect to each other.
A long time ago, I wrote my own TCP/IP stack.... What fun you can have with a protocol analysers and many hours to spare.
I actually set up IP networks inside British Telecom (as we called it them) before they used them officially! We used them inside Broadcast Services BEFORE Netscape came alone, so were able to roll out an Intranet server and a Web server before everyone else (the BBC Networking club and BTRL at Martlesham Heath).
Am I a little disappointed that some consumer IP networks were implemented using godawful asymmetric technology. Yes, I'm upset by that. I spent many years arguing to get fibre to the home.
If you want to lay anything at the feet of Margaret Thatcher then I blame her for forbidding BT to use their networks for "entertainment" (ie, IP networks) to let the cable companies "have a chance".
Law of unintended consequences, I suppose.
Looking to the future: if the mobile companies want to replace Freeview with 4G, then the deal they will have to strike is for the networks that replace them to have sufficient resilience: I can't see the BBC or ITV wanting anything less.
It well worth remembering that if you provide a free-basic-broadband for everyone then people might have a BT ADSL pipe PLUS a Virgin pipe PLUS 4G wireless and perhaps something provided using Wireless (ethernet).
Just because one network isn't resilient enough, doesn't mean they wouldn't be if you plugged them together.
As with any network: diverse routing is the key. DTT sites are fed with fibres in a loop, and have satellite as a backup.
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Dave Lindsay: I thought that the difference between grid north and magetic north was about one degrees at the moment?
Magnetic Declination
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Coffi: "please provide a full (not partial) postcode (or preferably enter it in box at the top right)"
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MikeB: I'm hard pushed to recall any analogue television sets that had "outputs". Other than for sound, of course!
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Steve Lintern: I would guess from your description that your central heating thermostat could be the cause. Can you try operating the thermostat to see if it causes the problem on demand?
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Steve Lintern: Of course gas central heating (or combined heat and power as I have) would be effected - the thermostat can't be gas.
I can't see 4G@800 having anything to so with this. Your transmitter is on frequencies lower than 600MHz.
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Eric Palmer: " they will need to send people door to door to alter equipment for them."
Yes. They do. They've been doing it for a year... They are called 4G@800 at800 | 4G & Freeview | 4G Interference | 4G Filters | at 800 MHz
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Dave: "From September 2013 " according to their application! http://licensing.ofcom.or….pdf
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Saturday 25 January 2014 6:55PM
Ian: Why do you say "digital isn't as reliable as analogue"? Do you have some figures of which I'm not aware?
And it depends on what you mean, of course, for the 15 years before switchover all the "analogue" channels were distributed digitally...