They're called "routers". ;) Otherwise, your framing is completely different between those mediums, so it's not like going from 100Base-FX ethernet to 100Base-TX ethernet! HTH, Scott Morris, CCIEx4 (R&S/ISP-Dial/Security/Service Provider) #4713, CCDE #2009::D, JNCIE-M #153, JNCIS-ER, CISSP, et al. CCSI #21903, JNCI-M, JNCI-ER [1]swm@emanon.com Knowledge is power. Power corrupts. Study hard and be Eeeeviiiil...... On 9/9/10 1:59 PM, Alan Bryant wrote: I did a quick google search for a converter but either I'm not understanding, or I'm not searching for the right thing. We currently have a POS OC-3 that I would like to be able to convert it to Ethernet, if possible. Do such devices exist? References 1. mailto:swm@emanon.com