The best option other than a Loytec switch as sysint states is a router configured as a repeater. A repeater repeats everything including noise. A router configured as a repeater will only pass the valid packets and not the noise. Loytec's switch does a good job of this as well.
"How it can be considered "Open" is beyond me. Calling it "voyeur-ed" would be more accurate." pka LeroyMac, SkyIsBlue, fka Freddy-B, Mongo, IndyBlue
BIG Government = More Dependents http://threedevilskennel.com/ - not my website.
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Another good option is using an Echelon LPR-10 router configured as a repeater. If you are not using an LNS tool to setup the router as a repeater there is a simple utility on the Echelon web site that will handle this for you.
Check it's price against the Loytec product. The LPR-10 will work at least as good the L-switch for this application.
You can use the repeaterconfig utility from Echelon for sure. I'm not sure about R2 support of routers. I think AX has some basic support for 1 router, but I don't know about R2.
You can find the repeaterConfig utility at Echelon's web site in the Support->Downloads section under routers. We are not allowed to post web site links, sorry. You will need to search it out. The file is RepeaterConfig100.zip.
You will need a login/password. If you don't already have one you can obtain one immediately by filling out a short form.
BTW - you can email a request like this one without a support contract to Echelon (look for the support email address at the site as well). Echelon will respond back but your question will go to the back of the queue behind any paying support customers.
Also, another option in getting technical support is to contact the Echelon sales person covering the buildings market. He worked in the HVAC market for Honeywell for several years before joining Echelon and can answer quite a numer of technical questions. Contact info is a no-no here so call Echelon and ask for the contact information for the buildings market sales person.