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The only visual difference is the identifying sticker in the bottom right-hand corner of the front panel. Each model is a single chassis which provides two ports for external noise injection via the DLS 5200R Reach Noise Generation System for ADSL2++.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.