Surge suppressor

Sharing a DSL connection with analog telephones may cause interference. 2Wire's DSL Filters eliminate all interference between your DSL line and analog lines. The result is clear, clean lines for your telephones, fax machines, answering machines, caller ID, and analog modems. All 2Wire DSL Filters also ensure that telephones never cause the DSL modem to adjust to the changing conditions of your DSL connection (called retraining), which could hinder your Internet access speeds.