Channel Bonding for higher thruput

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sarvani
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PostPosted: Mon Dec 01, 2008 16:20    Post subject: Channel Bonding for higher thruput Reply with quote
Dear Sash / Brainslayer

Do you have nay idea about "channel bonding"?

Suppose we have dual radio node like SBC 250. Assume that we establish a Point To Point link with similar radio using 2 antennas at each end. Can we combine the throughput of both radio cards into single ethernet port.

This I understand as channel bonding and claimed to produce 500Mbps (108X4) in a quad radio node Point To Point link, by XRF Tech (Architron Systems USA) any such possibility in DD-WRT ??

I look forward to hearing from you.

Regards

Amarendra
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Sash
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PostPosted: Mon Dec 01, 2008 16:49    Post subject: Re: Channel Bonding for higher thruput Reply with quote
sarvani wrote:
Dear Sash / Brainslayer

Do you have nay idea about "channel bonding"?

Suppose we have dual radio node like SBC 250. Assume that we establish a Point To Point link with similar radio using 2 antennas at each end. Can we combine the throughput of both radio cards into single ethernet port.
yes, possible
Quote:

This I understand as channel bonding and claimed to produce 500Mbps (108X4) in a quad radio node Point To Point link, by XRF Tech (Architron Systems USA) any such possibility in DD-WRT ??

this is exactly how its done in ddwrt. theoretically. it always depends on the link qualities, channels ans so on...

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sarvani
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Joined: 28 Oct 2008
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PostPosted: Tue Dec 02, 2008 2:19    Post subject: Re: Channel Bonding for higher thruput Reply with quote
Hello,

Our requirement shall be around 4-5 Kms. maintaining a link quality of 90% and above.

Assume we use 2 non over laping channels in 5.8 band.
then how can we use DD-WRT for ADI SBC250 + XR5 or similar combination??

Your answer gives me a picture to decide about license package to be procured.

Regards

Amarendra
Sash
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PostPosted: Tue Dec 02, 2008 8:45    Post subject: Reply with quote
http://www.dd-wrt.com/demo/Networking.asp

google the boning modes. its not that difficult.

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BrainSlayer
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PostPosted: Wed Dec 03, 2008 2:57    Post subject: Reply with quote
in newer versions there is also a special bonding mode named "duplex". so you can use 2 cards. one for transmission, one for receive
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sarvani
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Joined: 28 Oct 2008
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PostPosted: Thu Dec 04, 2008 2:58    Post subject: Channel Bonding for higher thruput Reply with quote
Hi,

I thank you for the answer.

Please consider I am a novice in this field and will be expressing so many doubts that might look silly.

I understand that in "Channel Bonding" mode, all the radios transmit at same time and receive at same time, in-order to avoid interference. is it correct??

Is it possible to establish a much bigger point to point (PTP) line like (200Mbps or so) in channel bonding mode?

what could be the practical difficulties in this type of application??



Regards

Amarendra
Sash
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Location: Hesse/Germany

PostPosted: Thu Dec 04, 2008 7:51    Post subject: Reply with quote
BrainSlayer wrote:
in more detail

configure both radios to wds ap (and for the second device to wds sta)

set them to unbridge, but dont configure a ip for these radios.

then go to setup->networking and create a bonding with the desired mode and add both interfaces to it (ath0 and ath1)


then add the bond interface to the existing bridge by using "assign to bridge"

its pretty simple if you know how


sarvani wrote:

I understand that in "Channel Bonding" mode, all the radios transmit at same time and receive at same time, in-order to avoid interference. is it correct??
this is physically not possible. in duplex one card will receive and the other will send simultaneously. in the other modes all cards will alternate between sending and receiving
Quote:

Is it possible to establish a much bigger point to point (PTP) line like (200Mbps or so) in channel bonding mode?
yes, its only dependens on how many cards u will have in your router und the cpu power.
Quote:

what could be the practical difficulties in this type of application??

cpu power
interfearence/overlapping channels
link quality
are some of the things comming into my mind.

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Sash
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PostPosted: Wed May 06, 2009 13:06    Post subject: Reply with quote
and to have the 200mbps on the eth phy u will need to have 1000baseT eth card
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chrisc
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Joined: 11 Sep 2008
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PostPosted: Fri May 08, 2009 21:52    Post subject: True Duplex? Reply with quote
Quick question: is it true duplex? or is it a psuedo-duplex? Reason I ask is that if the tx channel requires an ack back over the same ota channel, then it won't be of much use for long haul links. It would be great if you got rid of the acks. Then you could just use a unidirectional amp on the tx and create very long links.
Sash
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PostPosted: Fri May 08, 2009 22:05    Post subject: Reply with quote
to the fact that bonding is on software and ack on layer 2 i would say we will have ack on duplex mode also
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