Signature apparatus and techniques that make home networking devices, e.g., in-Home Phoneline Network (herein referred to as "HPN") devices, isolation filters, network interface devices, etc., detectable by commercially available metallic loop termination (MLT) test equipment. The invention also provides...http://www.google.com/patents/US6535580?utm_source=gb-gplus-sharePatent US6535580 - Signature device for home phoneline network devices
