WRT54GL Daisy Chained over 2000 meters

Discussion in 'Networking Issues' started by jon_s_brady, Oct 8, 2010.

  1. jon_s_brady

    jon_s_brady Networkin' Nut Member

    I want to establish a WDS-based network using up to 4 routers over a distance of 2000 meters (a rowing race course). I have previously set up a WDS successfully but I've got some questions that are specific to this scenarion.

    I've got a couple of 23dBi parabolic antennas that easily link the two ends. The master router (A) is at one end and with a slave (B) at the far end. Because of issues about the stability of the platforms I have to put both parabolics on solid structures (not floating) so they can keep their connection. I am using a third router (C) to connect to router B. Users will connect to the network through router C out on the water. The connection between routers B and C is using omin-directional antennas. This overcomes my issue of the instability of the platform that router C is on ( I don't have to worry about a narrow beamwidth losing the connection).

    So now the questions:

    The WRT54GL has dual antennas. I understand that these routers only use one antenna at a time and an internal switch. Routers A and B have directional antennas connected on one of each of their connectors. Router A will have one of the stock omnis to enable clients to connect on the other antenna connector. Router B will have the same configuration. Router C will simply have two omnis .

    Can Router B remain connected to the network if it is receiving signals only through the small omni. It seems to me that it would lose contact with Router A due to Router B choosing to use the omni that would be talking to Router C.

    I keep trying to find some information atbout "association" as I wonder if router B would "lose" it's association with Router A while it was talking to Router C as the same antenna supporting the B-C connection most certainly won't see reach router A.
  2. HennieM

    HennieM Network Guru Member

    This is how I understand it:
    A router setup for diversity with 2 (or more) antennae, tests signal strength on the received signal from a peer/station (as it cannot know what its own transmitted signal is at the peer). It would then send out a signal back to that peer through the same antenna it received the strongest signal.

    If that was the end of it, then your dual setup with one antenna covering one peer and the other antenna another peer should work.

    However, the diversity switching does not seem localized to a specific peer, but rather for the strongest peer. So, the antenna through which the strongest signal is received, is used for transmission, no matter which peer provided this strongest signal.

    Many people have reported on this forum that such a diversity-oriented setup does not work well. The alternatives are:

    1) Two (or more) routers with different (facing) antennae at every location, or
    2) More routers along the route, each with, in your scenario, an omni or wide-angle antenna, so the wds signal always travels (on the wds part of) wds+ap1--wds+ap2--wds+ap3--wds+apX, and a roaming station connects to the ap part of the router closest to it.
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