1 Exhibit 21.0 SUBSIDIARIES OF THE COMPANY NAME LOCATION STATE OF INCORPORATION - ---- -------- ---------------------- Advanced Communications, Corporation Columbia, South Carolina South Carolina American Telephone Wiring Company Charleston, West Virginia, USA West Virginia Associated Network Solutions, Inc. St. Petersburg, Florida, USA Florida ATIMCO Network Services, Inc. Pittsburgh, Pennsylvania, USA Pennsylvania BBox Holding Company Wilmington, Delaware, USA Delaware BB Technologies, Inc. Wilmington, Delaware, USA Delaware Black Box Corporation of Pennsylvania Lawrence, Pennsylvania, USA Delaware Midwest Communications Technologies, Inc. Columbus, Ohio, USA Ohio Key-Four, Inc. Atlanta, Georgia, USA Georgia Wakefield Electronics Group Inc. Miami, Florida, USA Florida Alpeco International Foreign Sales Corporation Bridgetown, Barbados Alpeco Puerto Rico, Inc. San Juan, Puerto Rico Black Box Catalog Australia Pty. Ltd. Croydon VIC, Australia Black Box Canada Corporation Ontario, Canada Black Box Catalog New Zealand Limited Wellington, New Zealand Black Box Catalogue, Ltd. Reading, England Black Box Communication SANV Zaventum, Belgium Black Box Datacom, B.V. Utrecht, Netherlands Black Box de Mexico, S.A. de C.V. Mexico City, Mexico Black Box Deutschland GmbH Munich, Germany Black Box do Brazil Industria e Comercio Ltda. Sao Paulo, Brazil Black Box France, S.A. Rungis, France Black Box Foreign Sales Corporation St. Thomas, U.S.V.I. Black Box Italia, SpA Vimodrone, Italy Black Box Japan Kabushiki Kaisha Tokyo, Japan Datacom Black Box Services AG Altendorf, Switzerland Datacom Black Box Holding, AG Zug, Switzerland South Hills Datacomm Chile, S.A. Santiago, Chile