EXHIBIT 21.1
STATE OF
ENTITY INCORPORATION DBA
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Advanced Technologies and Installation Corporation Washington
Airlan Telecom Services, L.P. Texas
Arby Construction Company, Inc. Delaware
Austin Trencher, Inc. Delaware
Computapole, Inc. Delaware
Conti Communications, Inc. Delaware
Croce Electric Company, Inc. Delaware
Crown Fiber Communications, Inc. Virginia
Dillard Smith Construction Company Delaware
Driftwood Electrical Contractors, Inc. Delaware Maddux Communications
Edwards Pipeline Company, Inc. Delaware
Environmental Professional Associates, Limited California PROVCO
Fiber Technology, Inc. Texas
GEM Engineering Co., Inc. Delaware
Golden State Utility Co. Delaware
H. L. Chapman Pipeline Construction, Inc. Delaware DB Utilities
Haines Construction Company Delaware Brown Engineering & Testing
Harker & Harker, Inc. Nevada
Intermountain Electric, Inc. Colorado Grand Electric
Irby Construction Company Mississippi
Logical Link, Inc. Delaware
Manuel Bros., Inc. Delaware Renaissance Construction
Western Directional
Mears Group, Inc. Delaware
Mejia Personnel Services, Inc. Texas
Metro Underground Services, Inc. Illinois
NetCom Management Group, Inc. Delaware
Network Communications Services, Inc. Delaware
Network Electric Company Delaware
North Pacific Construction Co., Inc. Delaware
North Sky Communications, Inc. Delaware
Northern Line Layers, Inc. Delaware
P.D.G. Electric Co. Florida
Pac West Construction, Inc. Delaware
PAR Electrical Contractors, Inc. Missouri Union Power Construction Company
Parkside Site & Utility Company Corporation Delaware
Parkside Utility Construction Company Delaware
Potelco, Inc. Washington Kingston Constructors
Kuenzi Construction
NorAm Telecommunications
Professional Teleconcepts, Inc. Illinois
Professional Teleconcepts, Inc. New York
QSI, Inc. Delaware
Quanta Delaware, Inc. Delaware
Quanta Utility Installation Co., Inc. Delaware
R. A. Waffensmith & Co., Inc. Delaware
Ranger Directional, Inc. Delaware
Riggin & Diggin Line Construction, Inc. Delaware
Seaward Corporation Maine Interstate Equipment Corporation
Dot 05 Optical Communications
STATE OF
ENTITY INCORPORATION DBA
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Southeast Pipeline Construction, Inc. Delaware
Spalj Construction Company Delaware Span-Con of Deerwood
Tjader & Highstrom
Wilson Roadbores
Specialty Drilling Technology, Inc. Delaware
Sullivan Welding, Inc. Delaware
Sumter Utilities, Inc. Delaware
Telecom Network Specialists, Inc. Delaware JT Communications
The Ryan Company, Inc. Massachusetts
Tom Allen Construction Company Delaware
Trans Tech Electric, L.P. Texas
Trawick Construction Co. Florida
TTGP, Inc. Delaware
TTLP, Inc. Delaware
TTM, Inc. North Carolina
TVS Systems, Inc. Delaware
TXLP, Inc. Delaware
Underground Construction Co., Inc. Delaware Hudson & Poncetta
Utilco, Inc. Georgia
VCI Telcom, Inc. Delaware
W. C. Communications, Inc. Delaware
W.H.O.M. Corporation California
World Fiber, Inc. Delaware Choice Optics
Sycamore Shoals
DeltaComm
Marlboro Cablevision Constructors