Relationship between wireless 'Rate' and actual throughput

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yctsai
DD-WRT Novice


Joined: 16 Aug 2010
Posts: 1

PostPosted: Mon Aug 16, 2010 2:40    Post subject: Relationship between wireless 'Rate' and actual throughput Reply with quote
Currently, I'm running two RT-N12. One for AP and the other for client bridge.
The firmware version is the 'EKO 14853'
The wireless is in '20 Mhz' bandwidth and N-only mode. (WPA2 personal + AES)

The scenario is
PC1 is connected with LAN on AP
PC2 is connected with LAN on client bridge
I shared some directories on PC2 by using WIN XP file sharing and
I only have around 20Mbps (2.x MB/s) while transferring data from PC2 to PC1.
However, the wirelss rate shown on system info page is no less than 78Mbps
(It is over 100Mbps for most of the time)

I heard that the actual transfer speed should be around half of the wireless rate.
So, I guess I can have 50Mbps (5~6 MB/s) in the scenario but not. Sad

Thanks for your patience to read this post.
Any opinion or suggestion?
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oxygenx
DD-WRT Guru


Joined: 11 Nov 2007
Posts: 566

PostPosted: Mon Aug 16, 2010 13:28    Post subject: Re: Relationship between wireless 'Rate' and actual throughp Reply with quote
yctsai wrote:

I heard that the actual transfer speed should be around half of the wireless rate.
So, I guess I can have 50Mbps (5~6 MB/s) in the scenario but not.

That only holds for G-networks. in N-networks it can be even less.
Quote:

Thanks for your patience to read this post.
Any opinion or suggestion?

The speeds seems to be too low (except for a really long distance, like >50m), but i dont know the RT-N12.

_________________
Router: WNDR3300 (wl0: n-Only 5Ghz, WPA2-AES, wl1: g-Only, WPA-Mixed-Mixed)
WDS Node 1: WNDR3300 (wl0: n-Only 5Ghz, WPA2-AES, WDS-connected Router, wl1: g-Only WPA-Mixed-Mixed)
WDS Node 2: WRT54GL (g-Only, WPA-Mixed-Mixed WDS-connected to Router)
Modem: Cisco EPC3202
clients: Notebook 1, D-Link 323, PS3 Slim, Kathrein UFC960 connected to WDS Node 1 via Gigabit Switch. Notebook 2, Deskjet 6980 connected to WDS Node 2
phuzi0n
DD-WRT Guru


Joined: 10 Oct 2006
Posts: 10143

PostPosted: Tue Aug 17, 2010 6:54    Post subject: Re: Relationship between wireless 'Rate' and actual throughp Reply with quote
oxygenx wrote:
yctsai wrote:

I heard that the actual transfer speed should be around half of the wireless rate.
So, I guess I can have 50Mbps (5~6 MB/s) in the scenario but not.

That only holds for G-networks. in N-networks it can be even less.
Quote:

Thanks for your patience to read this post.
Any opinion or suggestion?

The speeds seems to be too low (except for a really long distance, like >50m), but i dont know the RT-N12.

For A/B/G throughput was roughly half the link rate. For N spec it's a bit more complicated... On one hand the spec itself is more efficient so the throughput should be ~60% of the link rate (for example a 65mbps link gives ~40mbps throughput), but on the other hand many of Broadcom's CPU's aren't fast enough to handle the throughput and so you hit a throughput ceiling.

I would expect much more throughput with the setup you have but I haven't played with router to router throughput.

_________________
Read the forum announcements thoroughly! Be cautious if you're inexperienced.
Available for paid consulting. (Don't PM about complicated setups otherwise)
Looking for bricks and spare routers to expand my collection. (not interested in G spec models)
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