Check the listing for details. Excelsus Technologies Z-D250TJ Dsl Filter (4 WIRE LINE FILTER CONNECTION). Condition: New. Listed at 14.99 USD. Excelsus Technologies Z-D250TJ Dsl Filter (4 WIRE LINE FILTER CONNECTION) Product Features and Technical Details Product Features Z-D250TJ Dual-Line DSL Filter Description In-line filter for phones or telephone equipment sharing a two-line phone jack. Has detachable short cord to allow connection of longer cable in tight installations. Isolates DSL and home phoneline networking (HPN) signals from voice signal on both lines for peak data performance and voice quality. Effectively filters one or more phone devices (standard or cordless phone, answering machine, dial-up modem, fax machine, etc.) on line 1 and line 2. Use one filter at each phone jack in use in the home or office. Easy to install—just plug the filter cord into any standard phone jack, and plug the phone cord into the filter. Provides one unfiltered jack for DSL/HPN plus one filtered jack for any single or two-line phone device. Key Features Filters one or more phone devices sharing a single jack on line 1 and line 2 Blocks DSL/HPN signals from phone equipment to enhance voice-band signal Isolates DSL/HPN from phone equipment impedance for peak data performance Supports all major xDSL standards including VDSL; plus V.90, Caller ID and metallic-loop testing compatible Compliant and listed with FCC, CS03, UL, CE and CSA Compact in-line design—plugs into any standard phone jack Provides separate jacks for phone and DSL/HPN Plug and jacks have minimum of 50 microinches of gold plating to prevent corrosion and ensure reliable electrical connections