The "Reported bandwidth" figures advertised on the packaging are a
little dubious. Most bandwidth figures on wireless devices assumes ideal
transmission ranges and conditions, matched hardware on both ends of the
link, a single pair of transceivers, and plain-text transmission.
Wireless access points act just like wired hubs as in that maximum
bandwidth is split between however many nodes connect to the access
point. The slowest node determines the bandwidth splits for all nodes.
Encryption like WEP and WPA adds overhead on top of the normal
communications protocol for plain-text 802.11 a/b/g/n. The other big
caveat to Wireless N is that, to my knowledge, it is still a draft
standard and subject to revision by the IEEE before it is ratified. That
means that Draft N equipment may not continue to interoperate with
Finalized N equipment once all revisions to the standard are ratified.
In other words, be ready to upgrade your wireless N router and adapters
once the IEEE is done tinkering with the standard, should they stop
working "properly."


-------- Original Message --------
Subject: [PCBUILD] Wireless N but only 120mbps
From: Brad Feuerhelm <[log in to unmask]>
Date: Tue, February 02, 2010 11:26 am
To: [log in to unmask]

Hi All

First want to say thanks to all that replied to my thread "Allowing 
guest access to Internet not lan" which I'm going to go with the 
multiple router route. Now is that my second router is a Linksys but my 
nic's are Rosewill (all being "N") I have a problem of only getting 
around 120mbps bandwidth through the Linksys. I don't get the reported 
300mbps even with the Rosewill and matched NIC's I get 270mbps and the 
router is only 10 feet away or less with a clear shot to boot. So I'm 
concerned about using the Linksys router in this case. Since the 
Rosewill router is only 40 bucks I might consider just getting another
one.

I read somewhere that you have to have to match the NICS to the router 
in order to get maximum bandwidth. Is this true or am I missing 
something somewhere? Is this bandwidth normal in this case? The 
bandwidth is barely better than super g mode.

By the way my Rosewill is the Easy4 using WEP security, shared key. My 
environment is home/office more home than office. With two desktops 
wireless and two laptops wireless and two desktops wired.

Thanks

Brad Feuerhelm

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                         PCBUILD's List Owners:
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