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Post Time: 30/12/2007 17:53:28 |
Jonny
Total Forum Posts: 7 |
First of all forgive me posting my last post three times. This was obviously a mistake! While I await an answer to that issue (on UMTS for internet from computers), another question has come up about Dlan (I have been looking at the Philips Ethernet adapter SYK5600. The frequencies on which it works are 4.5 to 20.9 Megaherz.)
I live in a block of flats where my neighbours flat begins two metres away from my own flat (ie the two flats are separated by a small hallway and so are not directly adjoining). I have been told that 50 Herz home wiring generates a field of about one metre and a half. How large would the field generated by DLan be? If my neighbours have it, will the field enter into our flat?
Secondly, is it not possible that their system may transmit the field into our wiring too? The Philips product says that it can extend to 200 metres of wiring.
Any help gratefully received, thank you! |
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Post Time: 02/01/2008 17:15:10 |
alasdairP
Total Forum Posts: 173 |
dLANs use spread-spectrum (sort of 3G like signal) technology to send the data around the house wiring. The RF signals are very very low in strength and do not radiate far from the actual wires. They will interfere with short-wave radios and some units with medium-wave and long-wave radios as all of these are sensitive to a few micro-volts per metre AM radio energy.
The signal levels in the room are in the order of a few microvolts per metre rather than the few volts per metre from a WiFi hub - i.e. 1000-fold (signal wise) to 1000,000-fold (power-wise) less.
They can sometimes get through the electricity meter (especially some modern electronic ones) and into neighbouring properties - so, if you just connected one to an internet modem, they could theoretically use your broadband connection (as as with a WiFi unit). The safest way, if you use DLANs and are concerned about this, is to have a ADSL or cable modem-router on which you can set the security settings only to allow known and trusted network device IP address units to communicate through. That is what we do here. We have not tried working from different homes with multiple units. That is not an area we are concerned about - I suggest you ask Philips Technical support. We use a pair of 4-way Netgear 85 mbps dLANs and have had no problems with them whatsoever. Just plug and play and they always work.
Alasdair
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