Exhibit 21-a

ADC Telecommunications, Inc.
Subsidiaries
12/29/2005

Name	Jurisdiction
ADC (Australia) Technique PTY Limited	Australia
ADC (India) Communications & Infotech Private Limited	India
ADC AS	Norway
ADC Beteiligungsgesellschaft mbH	Germany
ADC Broadband (Hong Kong) Limited	Hong Kong
ADC Broadband Italy S.r.l.	Italy
ADC Broadband Wireless Group, Inc.	Pennsylvania
ADC Communications (Australia) PTY Limited	Australia
ADC Communications (NZ) Ltd.	New Zealand
ADC Communications (SEA) Pte. Ltd.	Singapore
ADC Communications (Shanghai)	People’s Republic of China
Company Ltd.
ADC Communications (Thailand) Ltd.	Thailand
ADC Communications (UK) Holding Ltd.	United Kingdom
ADC Communications (UK) Ltd.	United Kingdom
ADC Communications Hong Kong Limited	Hong Kong
ADC Communications Japan K.K.	Japan
ADC Connectivity Solutions LLC	Minnesota
ADC Czech Republic, s.r.o.	Czech Republic
ADC DSL Systems, Inc.	Delaware
ADC Danmark ApS	Denmark
ADC Digital Communications, Inc.	Delaware

1

Exhibit 21-a

Name	Jurisdiction
ADC EMEA Holding GmbH	Germany
ADC Europe N.V.	Belgium
ADC Global Holdings, Inc.	Minnesota
ADC GmbH	Germany
ADC Holding, Inc.	Delaware
ADC Incorporated	Colorado
ADC Informationssysteme GmbH	Germany
ADC International Holding Company	Minnesota
ADC International Holding, Inc.	Delaware
ADC International OUS, Inc.	Minnesota
ADC Irish Holding IA, LLC	Minnesota
ADC Irish Holding IIA, LLC	Minnesota
ADC Italia S.r.l	Italy
ADC Kommunikationstechnik GmbH	Austria
ADC Manufacturing Services PTY Limited	Australia
ADC Metrica Ireland Limited	Ireland
ADC OUS Holdings, LLC	Delaware
ADC Optical Systems, Inc.	Delaware
ADC Puerto Rico, Inc.	Puerto Rico
ADC Services Fulfillment, Inc.	New Jersey
ADC Services GmbH	Germany
ADC Soluciones de Conectividad, S.A.	Spain
ADC Systems Integration France SAS	France
ADC Telecom Canada Inc.	Canada
ADC Telecommunicacoes Industria e Comercio Ltda.	Brazil

2

Exhibit 21-a

Name	Jurisdiction
ADC Telecommunications (China) Limited	People’s Republic of China
ADC Telecommunications (Nanjing) Co. Ltd.	People’s Republic of China
ADC Telecommunications (Scotland) Limited	Scotland
ADC Telecommunications (Shanghai)
Distribution Co., Ltd.	People’s Republic of China
ADC Telecommunications (Switzerland) AG	Switzerland
ADC Telecommunications Australia Pty. Limited	Australia
ADC Telecommunications GmbH	Germany
ADC Telecommunications Netherlands B.V.	Netherlands
ADC Telecommunications Sales, Inc.	Minnesota
ADC Telecommunications Singapore Pte Limited	Singapore
ADC Telecommunications UK Ltd.	United Kingdom
ADC Telecomunicaciones Venezuela, S.A.	Venezuela
ADC Telecomunicacoes do Brasil Ltda.	Brazil
ADC USA Incorporated	Colorado
ADC Wireless Solutions LLC	Minnesota
ADC de Delicias, S. de R.L. de C.V.	Mexico
ADC de Juarez, S. de R.L. de C.V.	Mexico
ADC de Mexico S.A. de C.V.	Mexico
Codenoll Technology Corporation	Delaware
FONS (Ireland) Limited	Ireland
FONS Connectivity Corp.	Massachusetts
FONS Nitta (Hangzhou) Co., Ltd.	China

3

Exhibit 21-a

Name	Jurisdiction
FONS Nitta Asia Pacific Corporation	Japan
Fiber Optic Network Solutions Corp.	Massachusetts
G-Connect, Ltd.	Israel
KRONE (Africa) Pty. Ltd.	South Africa
KRONE Chile Ltda.	Chile
KRONE Communications Ltd.	India
KRONE Comunicaciones S.A. de C.V.	Mexico
KRONE Comunicacoes Ltda., Brazil	Brazil
KRONE Hellas Telecommunication .A., Greece	Greece
Nihon ADC Kabushiki Kaisha	Japan
OSS Software Corporation	New Jersey
OpenCell Corp.	Delaware
PT KRONE Indonesia	Indonesia
Princeton Optics, Inc.	New Jersey
Teleprocessing Products, Inc.	California
ZAO KRONE AG RF	Russia

4