US Signal Expands Ethernet Over Copper Footprint in Four Markets

GRAND RAPIDS, Mich., March 24, 2009 – US Signal, a leading provider of data bandwidth capacity in
the Midwest, today announced the expansion of its Ethernet over Copper (EoCu) service footprint in four
markets: Chicago, Detroit, Green Bay, Wis. and Toledo, Ohio.

US Signal’s Ethernet over Copper provides customers with access to bandwidth up to 20 Mbps matched with Ethernet simplicity and ease of management. Using traditional copper lines and access-loops, Ethernet over Copper is designed to be used with US Signal’s Dedicated Internet, MPLS VPN and Virtual Ethernet Service products. US Signal will be utilizing ADTRAN’s Total Access 5000 Ethernet Aggregation Platform to provide the copper-based Metro Ethernet extensions.

The expansion of Ethernet over Copper access gives customers in these markets a more affordable
option to connect to the US Signal network,” said Kirk Dombek, director of product development for US
Signal. “Ethernet over Copper access provides a cost-effective alternative for lower bandwidth solutions
that have historically required expensive bonded T1 and DS3 loops.”