Modular power line network adapter

An inline electrical power adapter, said adapter comprising:

• a first electrical connector, said first electrical connector configured to plug into a power connector of a standard computer power supply;
• a second electrical connector, said second electrical connector configured to receive a standard computer power cable connector;
• a filter disposed inside said adapter, said filter configured to receive electric power from said second electrical connector and provide filtered power to said first electrical connector;
• a balun inside said adapter;
• and
• a data connector, said data connector configured to couple data network signals to said second electrical connector through said balun, said balun comprising a step-down transformer such that full power line voltages do not appear at terminals of said data connector.

A power line network apparatus comprising;

• an adapter portion, said adapter portion comprising:
• a adapter housing;
• an electrical power plug attached to said adapter housing for plugging into a standard electrical outlet;
• a filter in said adapter housing configured to receive power from said electrical power plug;
• a cable configured to receive power from said electrical power plug through a step-down transformer in said adapter housing without passing through said filter;
• and
• a feed-through output socket in said adapter housing configured to receive power from said filter;
• and
• a modem portion connected by said cable to said adapter portion, said modem portion configured to produce output modulated data and couple said output modulated data to said cable, said modem portion further configured to receive input modulated data from said cable and demodulate said input modulated data.