Telecom Transport Management was already in a good position, serving wireless companies building out their next-generation networks.

Today the Seattle company, with headquarters in the Fremont neighborhood, is announcing that it has raised $20 million to expand into new markets, bringing its total funding to $140 million.

The latest round came from Washington, D.C.-based Columbia Partners Private Capital.

TTM's president and chief executive, Mark Hamilton, is a former McCaw Cellular and AT&T executive. His press release comment on the funding:

"Columbia Partners' strong financial support during a time when the capital markets are strained is a validation of TTM's business,'' he said. "This debt facility along with our recently completed equity round provides TTM with the resources we need to expand our current networks and move into new markets where we identify opportunities with our customers."

TTM is currently managing and building wireless backhaul networks in Virginia, Minnesota, Pennsylvania, New Jersey and Delaware, the release said.