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Exhibit 4.13  

ESCHELON OPERATING COMPANY
  as Issuer

the
guarantors named herein 

and

THE BANK OF NEW YORK TRUST COMPANY, N.A.
  as Trustee

SUPPLEMENTAL INDENTURE

Dated
as of January 20, 2005 

83/8%
Senior Second Secured Notes due 2010 

        SUPPLEMENTAL
INDENTURE, dated as of January 20, 2005, among Eschelon Operating Company (the "Issuer"), the Initial Guarantors (as
defined herein), Advanced TelCom, Inc., a Delaware corporation ("ATI"), Shared Communications Systems, Inc., an Oregon corporation
("SCS" and, together with ATI, the "Additional Guarantors"), and The Bank of New York Trust Company,
N.A., as Trustee. 

 
 

RECITALS    
    

        WHEREAS, the Issuer, the Guarantors party thereto (the "Initial Guarantors" and, together with the Additional
Guarantors, the "Guarantors") and the Trustee have entered into an Indenture, dated as of March 17, 2004 (as amended or supplemented, the
"Indenture"), pursuant to which the Issuer has issued $165 million aggregate principal amount at maturity of 83/8% Senior Second
Secured Notes due 2010 (the "Notes") and the Initial Guarantors previously have jointly and severally guaranteed on a senior subordinated basis (the
"Initial Guarantees") certain obligations of the Issuer in respect of the Notes pursuant to the Indenture and a Notation of Guarantee executed and
delivered by them; 

        WHEREAS,
Section 9.01 of the Indenture provides that the Issuer, the Initial Guarantors and the Trustee may amend or supplement the Indenture in order to provide for the issuance
of an additional guarantee (an "Additional Guarantee" and, together with the Initial Guarantees, the
"Guarantees") pursuant to this Supplemental Indenture and an additional Notation of Guarantee (the "Additional Notation of
Guarantee") without the consent of the Holders of the Notes; 

        WHEREAS,
the Issuer, the Initial Guarantors, the Additional Guarantors and the Trustee now wish to supplement the Indenture in order to provide for the issuance of Additional Guarantees
by the Additional Guarantors as described above; 

        WHEREAS,
all acts and things prescribed by the Indenture, by law and by the charter and the bylaws (or comparable constituent documents) of the Issuer, the Initial Guarantors, the
Additional Guarantors and the Trustee have been done to make this Supplemental Indenture a valid and binding agreement of the Issuer, the Initial Guarantors, the Additional Guarantors and the Trustee,
in accordance with its terms, and to make the Additional Notations of Guarantee, when duly issued and executed by the Guarantors, a valid and binding agreement of the Guarantors: 

 
 

ARTICLE 1    
    

        SECTION
1.01.    Supplemental Indenture.    

        This
Supplemental Indenture is supplemental to the Indenture and does and shall be deemed to form a part of, and shall be construed in connection with and as part of, the
Indenture for any and all
purposes. This Supplemental Indenture shall become effective immediately upon its execution and delivery by each of the Issuer, the Guarantors and the Trustee. 

 
 

ARTICLE 2    
    

        SECTION
2.01.    Indenture.    

        From
this date, in accordance with the Indenture and by executing this Supplemental Indenture and the Additional Notation of Guarantee, the Guarantors whose signatures appear below are
subject to the relevant provisions of the Indenture relating to Guarantors to the extent provided for therein, including, without limitation, in Article 10 thereunder. 

        SECTION
2.02.    Additional Guarantee.    

        Without
limiting the generality of the foregoing, each of the Additional Guarantors hereby unconditionally, jointly and severally with each other Guarantor, guarantees to each Holder of
a Note authenticated and delivered by the Trustee and to the Trustee and its successors and assigns, that: (i) the principal of and interest and any other amounts due on the Notes will be
promptly paid in full when due, subject to any applicable grace period, whether at maturity, by acceleration or otherwise and interest on the overdue principal, if any, and interest on any interest,
to the extent lawful, on the Notes 

and
all other obligations of the Issuer to the Holders or the Trustee hereunder or thereunder will be promptly paid in full or performed, all in accordance with the terms hereof and thereof; and
(ii) in case of any extension of time of payment or renewal of any Notes or of any such other obligations, the same will be promptly paid in full when due or performed in accordance with the
terms of the extension or renewal, subject to any applicable grace period, whether at stated maturity, by acceleration or otherwise, subject, however, in the case of clauses (i) and
(ii) above, to the limitations set forth in Article Ten of the Indenture. 

 
 

ARTICLE 3    
    

        SECTION
3.01.    Notes and Guarantees.    

        Except
as specifically modified herein, the Indenture, the Notes and the Guarantees are in all respects ratified and confirmed (mutatis
mutandis) and shall remain in full force and effect in accordance with their terms with all capitalized terms used herein without definition having the same respective meanings
ascribed to them as in the Indenture. 

        SECTION
3.02.    Trustee.    

        Except
as otherwise expressly provided herein, no duties, responsibilities or liabilities are assumed, or shall be construed to be assumed, by the Trustee by reason of this Supplemental
Indenture. This Supplemental Indenture is executed and accepted by the Trustee subject to all the terms and conditions set forth in the Indenture with the same force and effect as if those terms and
conditions were repeated at length herein and made applicable to the Trustee with respect hereto. 

 
 

ARTICLE 4    
    

        SECTION
4.01.    Governing Law.    

        THIS SUPPLEMENTAL INDENTURE SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.

        SECTION
4.02.    Successors.    

        All
agreements of the Issuer and the Guarantors, if any, in this Supplemental Indenture, if any, shall bind their successors. All agreements of the Trustee in this Supplemental Indenture
shall bind its successors. 

        SECTION
4.03.    Duplicate Originals.    

        All
parties may sign any number of copies of this Supplemental Indenture. Each signed copy shall be an original, but all of them together shall represent the same agreement. 

[signature page follows]

 
 

SIGNATURES    
    

        IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly executed, all as of the date first written above. 

	

 	
THE COMPANY
	

 	

ESCHELON OPERATING COMPANY
	

 	

By:	
 	

/s/ Geoffrey M. Boyd
 Geoffrey M. Boyd

Chief Financial Officer
	

 	
THE INITIAL GUARANTORS
	

 	

ESCHELON TELECOM, INC.

ESCHELON TELECOM OF MINNESOTA, INC.

ESCHELON TELECOM OF WASHINGTON, INC.

ESCHELON TELECOM OF COLORADO, INC.

ESCHELON TELECOM OF NEVADA, INC.

ESCHELON TELECOM OF UTAH, INC.

ESCHELON TELECOM OF OREGON, INC.

ESCHELON TELECOM OF ARIZONA, INC.

ESCHELON TELECOM OF CALIFORNIA, INC.

BUSINESS PRODUCTIVITY SOLUTIONS, INC
	

 	

By:	
 	

/s/ Geoffrey M. Boyd
 Geoffrey M. Boyd

Chief Financial Officer
	

 	
THE ADDITIONAL GUARANTORS
	

 	

ADVANCED TELCOM, INC.

SHARED COMMUNICATIONS SYSTEMS, INC.
	

 	

By:	
 	

/s/ Geoffrey M. Boyd
 Geoffrey M. Boyd

Chief Financial Officer
	

 	
TRUSTEE
	

 	

THE BANK OF NEW YORK TRUST COMPANY, N.A.

as Trustee
	

 	

By:	
 	

/s/ Patrick T. Giordano
 Patrick T. Giordano

Vice President

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RECITALS

ARTICLE 1

ARTICLE 2

ARTICLE 3

ARTICLE 4

SIGNATURESExhibit 4.14  

        THIS
SUPPLEMENT, dated as of January 20, 2005, (this "Supplement"), is to the Security Agreement, dated as of March 17, 2004 (as amended, supplemented, amended and restated
or otherwise modified from time to time, the "Security Agreement"), among the Grantors (such capitalized term, and other terms used in this Supplement, to have the meanings set forth or incorporated
by reference in Article I of the Security Agreement) from time to time party thereto, in favor of The Bank of New York Trust Company, N.A., in its capacity as the First Priority Agent. 

W I T N E S S E T H:  

        WHEREAS, the Eschelon Operating Company has entered into an Indenture, dated as of the date hereof (as amended, supplemented, amended and restated or otherwise
modified from time to time, the "Indenture") with The Bank of New York Trust Company, N.A., as Trustee (in such capacity, the "Trustee"), pursuant to which it has issued, as of the date hereof,
83/8% Senior Second Secured Notes due 2010 in the original aggregate principal amount of $165,000,000; 

        WHEREAS,
pursuant to the provisions of the Indenture and Section 7.11 of the Security Agreement, the undersigned is becoming a Grantor under the Security Agreement; 

        NOW,
THEREFORE, for good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the undersigned agrees, for the benefit of the Collateral Agent, the
Trustee and the Holders, as follows. 

        SECTION 1. Party to Security Agreement, Etc.    By its signature below the undersigned hereby agrees to become a Grantor under
the Security Agreement and hereby assumes the Obligations of a Grantor thereunder, with the same force and effect as if it were an original signatory thereto. The undersigned Grantor hereby
(a) agrees to be bound by and comply with all of the terms and provisions of the Security Agreement applicable to it as a Grantor and (b) represents and warrants that the representations
and warranties made by it as a Grantor thereunder are true and correct as of the date hereof, unless stated to relate solely to an earlier date, in which case, such representations and warranties
shall be true and correct in all material respects as of such earlier date. In furtherance of the foregoing, each reference to a "Grantor" in the Security Agreement shall be deemed to include the
undersigned Grantor. Attached to this Supplement are the various Schedules required under the terms of the Security Agreement, accurately completed by an Authorized Officer of the Grantor. 

        SECTION 2. Full Force of Security Agreement.    Except as expressly supplemented hereby, the Security Agreement shall remain in
full force and effect in accordance with its terms. 

        SECTION 3. Governing Law, Entire Agreement, Etc.    THIS SUPPLEMENT SHALL BE DEEMED TO BE A CONTRACT MADE UNDER AND GOVERNED BY
THE INTERNAL LAWS OF THE STATE OF NEW YORK (INCLUDING FOR SUCH PURPOSE SECTIONS 5-1401 AND 5-1402 OF THE GENERAL OBLIGATIONS LAW OF THE STATE OF NEW YORK). THIS SUPPLEMENT AND
THE OTHER LOAN DOCUMENTS CONSTITUTE THE ENTIRE UNDERSTANDING AMONG THE PARTIES HERETO WITH RESPECT TO THE SUBJECT MATTER HEREOF AND THEREOF AND SUPERSEDE ANY PRIOR AGREEMENTS, WRITTEN OR ORAL, WITH
RESPECT THERETO. 

        SECTION 4. Counterparts.    This Supplement may be executed by the parties hereto in several counterparts, each of which shall
be deemed to be an original and all of which shall constitute together but one and the same agreement. Delivery of an executed counterpart of a signature page to this Security Agreement by facsimile
shall be effective as delivery of a manually executed counterpart of this Security Agreement. 

*
* * * * 

        IN
WITNESS WHEREOF, the undersigned Grantor has caused this Supplement to be duly executed and delivered by its Authorized Officer as of the date first above written. 

	

ADVANCED TELCOM, INC.	
 	

 
	

By:	

/s/ Geoffrey M. Boyd
 Geoffrey M. Boyd

Chief Financial Officer	
 	

 
	

Accepted by:	
 	

 
	

THE BANK OF NEW YORK TRUST COMPANY, N.A., as Collateral Agent
	

By:	

/s/ Patrick T. Giordano
 Patrick T. Giordano

Vice President	
 	

 

SCHEDULE I

to Supplement No. 3

to Security Agreement

(Advanced TelCom, Inc.)  

Item A. Locations of Grantor:  

Delaware 

Item B. Filing locations last five years  

N/A. 

Item C. Trade names  

Advanced
TelCom, Inc. 

Item D. Merger or other corporate reorganization  

None. 

Item E. Taxpayer ID numbers  

77-0489158 

Item F. Government Contracts  

None. 

Item G. Deposit Accounts  

	Bank
 
	 	Account Title
	 	Account Number

	Wells Fargo	 	Disbursement Account	 	4950019398
	Wells Fargo	 	Sweep & Concentration Account	 	4000021485

SCHEDULE II

to Supplement No. 3

to Security Agreement

(Advanced TelCom, Inc.)  

Item A. Patents  

None. 

Issued Patents:    None. 

Item B. Patent Licenses  

None. 

SCHEDULE III

to Supplement No. 3

to Security Agreement

(Advanced TelCom, Inc.)  

Item A. Trademarks  

None. 

Registered Trademarks:    None. 

Pending Trademark Applications:    None. 

Trademark Applications in Preparation:    None. 

Item B. Trademark Licenses  

None. 

SCHEDULE IV

to Supplement No. 3

to Security Agreement

(Advanced TelCom, Inc.)  

Item A. Copyrights/Mask Works  

Registered Copyrights/Mask Works:    None. 

Copyright/Mask Work Pending Registration Applications:    None. 

Copyright/Mask Work Registration Applications in Preparation:    None. 

Item B. Copyright/Mask Work Licenses  

None. 

SCHEDULE V

to Supplement No. 3

to Security Agreement

(Advanced TelCom, Inc.)  

Trade Secret or Know-How Licenses  

None.

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