<PAGE>

                                                                    Exhibit 10.4

September 22, 2006

Belden CDT Inc.
7701 Forsyth, Suite 800
St. Louis, Missouri 63105
Attention: Stephen H. Johnson

Re:  Credit Agreement, dated as of January 24, 2006 (as amended, restated,
     supplemented or otherwise modified from time to time, the "Credit
     Agreement"), among Belden CDT Inc., a Delaware corporation (the
     "Borrower"), the Domestic Subsidiaries of the Borrower from time to time
     party thereto (the "Guarantors"), the Lenders from time to time parties
     thereto and Wachovia Bank, National Association, as administrative agent
     (the "Administrative Agent"). Unless otherwise defined herein, terms
     defined in the Credit Agreement and used herein shall have the meanings
     given to them in the Credit Agreement.

     You have requested that the Required Lenders consent to the investment by
the Credit Parties or any of their Subsidiaries of up to $5,000,000 in Capital
Stock issued by Extricom Ltd., an Israeli private company, (the "Target
Investment"), which investment is not otherwise permitted by the provisions of
Sections 6.4(b) and 6.5 of the Credit Agreement. Accordingly, the undersigned
Lenders hereby consent to the making of the Target Investment by the Credit
Parties, notwithstanding the provisions of Sections 6.4(b) or 6.5 of the Credit
Agreement. It is hereby understood and agreed that the amount of the Target
Investment shall not count against the $2,000,000 Investment basket set forth in
clause (n) of the definition of "Permitted Investments".

     Except for the foregoing limited consent, all terms and conditions of the
Credit Agreement shall remain in full force and effect, without modification or
limitation. This Consent shall not constitute a consent to any other action or
inaction by the Borrower or any other Credit Party, nor shall it operate as a
waiver of any other right, power, or remedy of any Lender or the Administrative
Agent under, or of any provision contained in, the Credit Agreement or any other
Credit Document or under applicable law (all of which rights and remedies are
hereby expressly reserved by the Lenders and the Administrative Agent), except
as specifically provided herein. Each of the Guarantors acknowledges and
consents to the terms of this Consent and agrees that this Consent does not
operate to reduce or discharge the Guarantors' obligations under the Credit
Documents.

                  [remainder of page intentionally left blank]

<PAGE>

AGENT AND LENDERS:                      WACHOVIA BANK, NATIONAL ASSOCIATION,
                                        as Administrative Agent and a Lender


                                        By: /s/ David K. Hall
                                            ------------------------------------
                                        Name: David K. Hall
                                        Title: Director - Agency Management

<PAGE>

                                        NATIONAL CITY BANK


                                        By: /s/ Eric Hartman
                                            ------------------------------------
                                        Name: Eric Hartman
                                        Title: Vice President

<PAGE>

                                        COMERICA BANK
                                        Name of Institution


                                        By: /s/ Mark J. Leveille
                                            ------------------------------------
                                        Name: Mark J. Leveille
                                        Title: Assistant Vice President
<PAGE>

                                        Bank of America N.A.
                                        Name of Institution


                                        By:    /s/ HARVEY H. THAYER, JR.
                                            ---------------------------------
                                        Name:  Harvey H. Thayer, Jr.
                                              -------------------------------
                                        Title: Managing Director


<PAGE>

                                        THE NORTHERN TRUST COMPANY


                                        By: /s/ Roger McDougal
                                            ---------------------------------
                                        Name: Roger McDougal
                                        Title: Vice President

<PAGE>

                                        FIFTH THIRD BANK


                                        By: /s/ Shawn D. Hagan
                                            ---------------------------------
                                        Name: Shawn D. Hagan
                                        Title: Vice President

<PAGE>

                                        ING Bank N.V.
                                        Name of Institution


                                        By: /s/ B.F.G Jacobs
                                            ---------------------------------
                                        Name: B.F.G Jacobs
                                        Title: principal Relationshipmanager


                                        /s/ P.A.J. van Vuuren
                                        -------------------------------------
                                        Name: P.A.J. van Vuuren
                                        Title: Directeur Bedrijven &
                                               Instellingen
<PAGE>

                                        U. S. Bank National Association
                                        Name of Institution


                                        By: /s/ John Holland
                                            ------------------------------------
                                        Name: John Holland
                                        Title: Senior Vice President

<PAGE>

                                        Acknowledged and Agreed:

BORROWER:                               BELDEN CDT INC.,
                                        a Delaware corporation


                                        By: /s/ Stephen H Johnson
                                            ------------------------------------
                                        Name: Stephen H Johnson
                                        Title: Treasurer


GUARANTORS:                             BELDEN WIRE & CABLE COMPANY,
                                        a Delaware corporation


                                        By: /s/ Stephen H Johnson
                                            ------------------------------------
                                        Name: Stephen H Johnson
                                        Title: Treasurer


                                        BELDEN CDT NETWORKING, INC.,
                                        a Washington corporation


                                        By: /s/ Stephen H Johnson
                                            ------------------------------------
                                        Name: Stephen H Johnson
                                        Title: Treasurer


                                        NORDX/CDT CORP.,
                                        a Delaware corporation


                                        By: /s/ Stephen H Johnson
                                            ------------------------------------
                                        Name: Stephen H Johnson
                                        Title: Treasurer


                                        THERMAX/CDT, INC.,
                                        a Delaware corporation


                                        By: /s/ Stephen H Johnson
                                            ------------------------------------
                                        Name: Stephen H Johnson
                                        Title: Treasurer

<PAGE>

                                        BELDEN HOLDINGS, INC.,
                                        a Delaware corporation


                                        By: /s/ Stephen H Johnson
                                            ------------------------------------
                                        Name: Stephen H Johnson
                                        Title: Treasurer


                                        BELDEN TECHNOLOGIES, INC.,
                                        a Delaware corporation


                                        By: /s/ Stephen H Johnson
                                            ------------------------------------
                                        Name: Stephen H Johnson
                                        Title: Treasurer


                                        BELDEN INC.,
                                        a Delaware corporation


                                        By: /s/ Stephen H Johnson
                                            ------------------------------------
                                        Name: Stephen H Johnson
                                        Title: Treasurer


                                        CDT INTERNATIONAL HOLDINGS INC.,
                                        a Delaware corporation


                                        By: /s/ Stephen H Johnson
                                            ------------------------------------
                                        Name: Stephen H Johnson
                                        Title: Treasurer