Black Box (BBOX) 10-Q 2009 Q3 Quarterly report

Exhibit 21.1

SUBSIDIARIES OF THE REGISTRANT

		State or Other
		Jurisdiction of
		Incorporation or
Legal Name	Doing Business As	Organization
Black Box Corporation	Black Box Corporation	Delaware
ACS Communications, Inc.	ACS Communications, Inc.	Texas
ACS Dataline of the Northwest, Inc.	Black Box Network Services	Oregon
ACS Investors, LLC	ACS Investors, LLC	Delaware
ACS Dataline, LP	Black Box Network Services	Texas
ACS Partners, LLC	ACS Partners, LLC	Texas
ADS Telecom, Inc.	Black Box Network Services	Florida
B & C Telephone, Inc.	Black Box Network Services	Washington
	Black Box Network Services — Spokane
BBox Holding Company	BBox Holding Company	Delaware
Advanced Communications Corporation	Black Box Network Services — South Carolina	South Carolina
Advanced Network Technologies, Inc.	Black Box Network Services — California	California
American Telephone Wiring Company	Black Box Network Services — West Virginia Operations	West Virginia
Atimco Network Services, Inc.	Black Box Network Services — Western Pennsylvania	Pennsylvania
	Operations
Black Box Corporation of Pennsylvania	Black Box Corporation of Pennsylvania	Delaware
	Black Box Network Services
BB Technologies, Inc.	BB Technologies, Inc.	Delaware
Black Box A/S	Black Box A/S	Denmark
Black Box Canada Corporation	Black Box Canada Corporation	Canada
Black Box Comunicaciones, S.A.	Black Box Comunicaciones, S.A.	Spain
Black Box Datacom B.V.	Black Box Datacom B.V.	Netherlands
Black Box de Mexico, S.A. de C.V.	Black Box de Mexico, S.A. de C.V.	Mexico

		State or Other
		Jurisdiction of
		Incorporation or
Legal Name	Doing Business As	Organization
Black Box Deutschland GmbH	Black Box Deutschland GmbH	Germany
Black Box Netzwerk Service Bayern GmbH	Black Box Netzwerk Service Bayern GmbH	Germany
Black Box Netzwerkservice Stuttgart GmbH	Black Box Netzwerkservice Stuttgart GmbH	Germany
Black Box do Brasil Industria e Comercio Ltda.	Black Box do Brasil Industria e Comercio Ltda.	Brazil
Black Box Foreign Sales Corporation	Black Box Foreign Sales Corporation	U.S. Virgin Islands
Black Box France	Black Box France	France
Black Box Ile De France	Black Box Ile De France	France
Black Box GmbH	Black Box GmbH	Austria
Black Box Holdings Australia Pty. Ltd.	Black Box Holdings Australia Pty. Ltd.	Australia
Black Box Italia S.r.l.	Black Box Italia S.r.l.	Italy
Black Box Network Products NV	Black Box Network Products NV	Belgium
Black Box Network Cabling NV	Black Box Network Cabling NV	Belgium
Black Box Network Design NV	Black Box Network Design NV	Belgium
Black Box Network Services AG	Black Box Network Services AG	Switzerland
Black Box Network Services Australia Pty Ltd.	Black Box Network Services Australia Pty Ltd.	Australia
Black Box Network Services New Zealand Limited	Black Box Network Services New Zealand Limited	New Zealand
Black Box Network Services Kabushiki Kaisha	Black Box Network Services Kabushiki Kaisha	Japan
Black Box Network Services (UK) Limited	Black Box Network Services (UK) Limited	England
	Black Box Network Services (UK) Limited —
	Northern Ireland
Black Box P.R. Corp.	Black Box P.R. Corp.	Puerto Rico
Black Box Network and Electrical Services, Inc.	Black Box Network and Electrical Services, Inc.	New York
	Allcom Electric
Black Box Network Services, Inc. — Government	Black Box Network Services, Inc. — Government	Tennessee
Solutions	Solutions

2

		State or Other
		Jurisdiction of
		Incorporation or
Legal Name	Doing Business As	Organization
Cable Consultants, Incorporated	Black Box Network Services — Atlanta	Georgia
Comm Line, Inc.	Black Box Network Services	Ohio
Communication Contractors, Inc.	Black Box Network Services — Chicago	Illinois
Datel Communications, Inc.	Black Box Network Services — Arizona	Arizona
Delaney Telecom, Inc.	Black Box Network Services	Pennsylvania
DESIGNet, Inc.	Black Box Network Services — San Jose	California
Integrated Cabling Systems, Inc.	Black Box Network Services — Nebraska	Nebraska
Jet Line Communications, Inc.	Black Box Network Services — Dallas	Texas
BBC Acquisition, LLC	BBC Acquisition, LLC	Texas
FBS Communications, L.P.	Black Box Network Services — San Antonio	Texas
K & A Communications, Inc.	Black Box Network Services	Missouri
Koncepts Communications of L.I., Corp.	Black Box Network Services — Tristate Operations	New York
Michael Electric, Inc.	Black Box Network Services — New Jersey	New Jersey
Midwest Communications Technologies, Inc.	Black Box Network Services	Ohio
Midwest Electronics and Communications, Inc.	Black Box Network Services — Denver Operations	Colorado
R & D Services, Inc.	Black Box Network Services	Massachusetts
	Black Box Network Services — New England
Teldata Corporation	Black Box Network Services — Tennessee	Tennessee
Telefuture Communications Ltd.	Black Box Network Services — New Rochelle Office	New York
Todd Communications, Inc.	Black Box Network Services — North Carolina	North Carolina
U.S. Premise Networking Services, Inc.	Black Box Network Services — MN	Minnesota
Black Box AB	Black Box AB	Sweden
Black Box Chile S.A.	Black Box Chile S.A.	Chile

3

		State or Other
		Jurisdiction of
		Incorporation or
Legal Name	Doing Business As	Organization
Black Box Finland OY	Black Box Finland OY	Finland
Black Box Network Services AB	Black Box Network Services AB	Sweden
Black Box Network Services Corporation	Black Box Network Services Corporation	Taiwan
Black Box Network Services (Dublin) Limited	Black Box Network Services (Dublin) Limited	Ireland
Black Box Network Services (Gouda) B.V.	Black Box Network Services (Gouda) B.V.	Netherlands
Black Box Network Services NW AG	Black Box Network Services NW AG	Switzerland
Black Box Network Services Puebla S.A. de C.V.	Black Box Network Services Puebla S.A. de C.V.	Mexico
Black Box Network Services S.r.l.	Black Box Network Services S.r.l.	Italy
Black Box Network Services SDN. BHD.	Black Box Network Services SDN. BHD.	Malaysia
Black Box Network Services Singapore Pte Ltd.	Black Box Network Services Singapore Pte Ltd.	Singapore
Black Box Norge AS	Black Box Norge AS	Norway
Black Box Services Reseaux Mediterranee	Black Box Services Reseaux Mediterranee	France
Consultoria en Redes, S.A. de C.V.	Consultoria en Redes, S.A. de C.V.	Mexico
JC Informatica Integral, S.A. de C.V.	JC Informatica Integral, S.A. de C.V.	Mexico
Lanetwork Sales Ltd.	Lanetwork Sales Ltd.	Canada
Mutual Telecom Services Inc.	Black Box Network Services	Delaware
Network Communications Technologies, Inc.	Black Box Network Services	North Carolina
Norstan, Inc.	Black Box Network Services	Minnesota
Norstan Canada Inc.	Norstan Canada Inc.	Minnesota
Norstan Canada, Ltd./Norstan Canada, Ltee	Black Box Network Services	Canada
Norstan Communications, Inc.	Black Box Network Services	Minnesota
NextiraOne, LLC	Black Box Network Services	Delaware
	Black Box Network Services — Illinois

4

		State or Other
		Jurisdiction of
		Incorporation or
Legal Name	Doing Business As	Organization
Data Communications 2000, Inc.	Data Communications 2000, Inc.	California
Milgo Holdings Canada, LLC	Milgo Holdings Canada, LLC	Delaware
NextiraOne Canada ULC	NextiraOne Canada ULC	Canada
NextiraOne California L.P.	NextiraOne California L.P.	California
NXO Installation, LLC	NXO Installation, LLC	Delaware
NextiraOne Federal, LLC	Black Box Network Services Black Box Network Services — Federal	Delaware
NextiraOne New York, LLC	Black Box Network Services	Delaware
Vibes Technologies, Inc.	Black Box Resale Services	Minnesota
Norstan Financial Services, Inc.	Norstan Financial Services, Inc.	Minnesota
Norstan International, Inc.	Norstan International, Inc.	Minnesota
Nortech Telecommunications Inc.	Black Box Network Services — Elk Grove	Illinois
Nu-Vision Technologies, Inc.	Black Box Network Services	New York
Nu-Vision Technologies, LLC	Black Box Network Services	New York
BCS II, LLC	BCS II, LLC	Delaware
UCI Communications LLC	Black Box Network Services	South Carolina

5