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Are 802.11n routers ever poorly advertised when it comes to speeds and duplexing?

post #1 of 8
Thread Starter 

Might need a new router and I'm not quite sure on this answer.

 

Is it ever common for companies to advertise their router's speeds by claiming a wifi speed, yet you can really only get half of it because of duplexing? I assume so since the older 802.11g routers always said 54Mps, yet they can only do around 27. If so, how would you identify the routers true half duplex speeds?

 

Since I'm here and I'm embarrassing and severely slacking on my IT game, do dual band routers provide a full duplex to single wifi NIC nodes? Thanks.

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post #2 of 8
well first wireless speeds are advertised as upto XMbps as distance to ap/ signal loss due to walls floor etc/ interference from some newer cordless phones, micowave ovens etc all affect wireless speeds, so the manufactures cant garrantee you will get thier advertised speed as its proportion to your enviroment factors..

IIRC older wireless runs in half duplex and that should be takin into account, full duplex dot11g should get you 108Mbps in thoery. as to full duplex im not sure if they have implement it as last i heard it was a worj in progress.

its like LAN, fullduplex GBe is actually 2Gbps speeds

anyway, what it all comes down to the dot11standard the router supports, for best wireless look for 802.11n standard and dual band wireless for the optimal wireless network.. smile.gif i hop that helps and i didnt make any mistakes lol
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post #3 of 8
http://en.wikipedia.org/wiki/Carrier_sense_multiple_access_with_collision_avoidance

^ that will completely destroy your throughput.
More similar to wiring everything to a hub and wondering why throughput is low with a high level of collisions.
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post #4 of 8
Thread Starter 


 

Quote:
Originally Posted by stubass View Post

full duplex dot11g should get you 108Mbps in thoery. as to full duplex im not sure if they have implement


I thought full duplex 802.11g would just get 54Mbps and since 802.11g operates at half duplex, an 802.11g router will only give you ~22-27Mbps max? Is my information wrong? I know Linksys has some 108Mbps G, but standard routers are 54Mbps.

 


 

Quote:
Originally Posted by beers View Post

http://en.wikipedia.org/wiki/Carrier_sense_multiple_access_with_collision_avoidance
^ that will completely destroy your throughput.
More similar to wiring everything to a hub and wondering why throughput is low with a high level of collisions.


 

How much can be expected? I've never really noticed a speed dip for more than a few seconds while downloading a large file.

 

If your ISP gives you a 100Mbps, or lets say 130Mbps (for boost reasons), would an 802.11n rated at 300Mbps work? Would a 150Mbps rated one not, unless the router and nodes use dual band?

 

Last I read the N standard is still half duplex, however I also read that "a two-channel setup where all transmissions in one direction are receiving while all transmissions in the other direction are transmitting", would work the same as a full duplex wireless. Would this only be possible if the router has two antennas as well as the users wireless adapter? Where the router and adapter have 2.4 on one antenna and 5Ghz on the other?

 

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post #5 of 8
actually i made an error... The 54 Mbps rate is the raw symbol rate, or the number of symbols per second including all framing, error correction, etc. The net throughput rate of 10 to 20 Mbps (or higher) erases all the stuff you need to carry data and looks at the payload. smile.gif

last i heard full duplex wireless is still a work in progress and hasnt formally been introduced yet..

as to dual channel, im not sure unless you mean dual band which i though were the same thing thinking.gif... dual band is the capability to transmit on the 5 GHz band of 802.11a and also the 2.4 GHz band similtanously and not one band trannsmitts which the other recieves.. Some newer 802.11n Wi-Fi routers also allow simultaneous dual band communication with both 2.4 GHz and 5 GHz clients. By supplying separate network bandwidth for each of the two types of links, these routers provide maximum flexibility in setting up a home network. For example, older 802.11b/g clients can be set to run on the 2.4 GHz side of a simultaneous dual-band router without impacting the performance of 802.11n clients running at 5 GHz. This is possible if the router has two antennas..
Edited by stubass - 3/3/12 at 5:13pm
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post #6 of 8
Quote:
Originally Posted by pLuhhmm View Post

If your ISP gives you a 100Mbps, or lets say 130Mbps (for boost reasons), would an 802.11n rated at 300Mbps work? Would a 150Mbps rated one not, unless the router and nodes use dual band?

It would 'work' but if you're indicating that it will be able to saturate your WAN bandwidth, I would disagree.
Speeds over '150 mbps' are achieved by using MIMO. You use two or three antennae in tandem to create more bandwidth.

The most I can get out of my 2x2 2.4 Ghz WLAN adapter to the RT-N16 is around ~4 MB/sec or so on Windows transfers to the file server, granted my area is horrendously saturated with wifi and there are in excess of 30 APs within reach.
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post #7 of 8
All wireless is half duplex. N gives you faster speeds because it uses multiple streams. The radio still can only receive or transmit one session at a time to one client at a time.

You can't combine a 2.4 and a 5 Ghz radio for a single transmission.

This should help some...


The backward compatibility and speed capability of 802.11n come from its use of multiple
antennas and a technology called Multiple-Input, Multiple-Output (MIMO). MIMO,
pronounced Mee-Moh, uses different antennas to send and receive, thus increasing
throughput and accomplishing more of a full duplex operation.

MIMO comes in three types:

■ Precoding
■ Spatial multiplexing
■ Diversity coding

Precoding is a function that takes advantage of multiple antennas and the multipath issue
that was discussed in Chapter 3, “WLAN RF Principles.” 802.11n uses transmit beamforming
(TxBF), which is a technique that is used when more than one transmit antenna
exists where the signal is coordinated and sent from each antenna so that the signal at the
receiver is dramatically improved, even if it is far from the sender. This technique is something
that you would use when the receiver has only a single antenna and is not moving. If
the receiver is moving, then the reflection characteristics change, and the beamforming
can no longer be coordinated. This coordination is called channel state information (CSI).
Spatial multiplexing takes a signal, splits it into several lower rate streams, and then sends
each one out of different antennas. Each one of the lower rate streams are sent on the
same frequency. The number of streams is limited to the lowest number of antennas on either
the transmitter or the receiver. If an AP has four antennas and a client has two, you are
limited to two.


Just remember any speed you see advertised is actually the connection rate, and not the throughput rate.
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post #8 of 8
I get about 22 to 30 megabits on my Wireless G connection.
So it is about right the maximum speed your getting.
With a link speed of 240-270 megabits I get up to 100 megabits on it on peak. (Wireless N)
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