Exhibit 4.5



 Exhibit 4.5 
 EIGHTH SUPPLEMENTAL INDENTURE 
 EIGHTH SUPPLEMENTAL INDENTURE (this
“Supplemental Indenture”) dated as of December 6, 2010, among PAETEC Holding Corp., a Delaware corporation (the “Issuer”), each of the entities listed as a “New Guarantor” on the signature pages
hereto (collectively, the “New Guarantors”), and The Bank of New York Mellon (formerly known as The Bank of New York), as trustee under the indenture referred to below (the “Trustee”). 

RECITALS 

WHEREAS, the Issuer and certain of its Subsidiary Guarantors have heretofore executed and delivered to the Trustee an Indenture,
dated as of July 10, 2007 (as supplemented by the First Supplemental Indenture, the Second Supplemental Indenture, the Third Supplemental Indenture and the Fourth Supplemental Indenture referred to below, the “Indenture”),
providing for an initial issuance of an aggregate principal amount of $300,000,000 of the Issuer’s 9.5% Senior Notes due 2015 (the “Notes”) and Subsidiary Guarantees of the Notes by the Subsidiary Guarantors, and the Issuer and
other Subsidiary Guarantors have heretofore executed and delivered to the Trustee a First Supplemental Indenture, dated as of September 25, 2007 (the “First Supplemental Indenture”), a Second Supplemental Indenture, dated as of
February 8, 2008 (the “Second Supplemental Indenture”), a Third Supplemental Indenture, dated as of December 18, 2009 (the “Third Supplemental Indenture”), a Fourth Supplemental Indenture, dated as of
April 23, 2010 (the “Fourth Supplemental Indenture”), a Fifth Supplemental Indenture, dated as of June 22, 2010 (the “Fifth Supplemental Indenture”), a Sixth Supplemental Indenture, dated as of
October 15, 2010 (the “Sixth Supplemental Indenture”) and a Seventh Supplemental Indenture dated as of the date hereof, each providing for Subsidiary Guarantees of the Notes by the Subsidiaries party thereto; 

WHEREAS, Sections 4.19 and 10.03 of the Indenture provide that the Issuer is required to use commercially reasonable
efforts to cause its current and future Restricted Subsidiaries that are eligible to be Subsidiary Guarantors under the definition thereof in the Indenture to execute and deliver to the Trustee a supplemental indenture pursuant to which such
Restricted Subsidiaries shall, jointly and severally with the other Subsidiary Guarantors, fully and unconditionally guarantee the payment and performance of the Notes and the other obligations set forth in Section 10.01 of the
Indenture, subject to Article Ten of the Indenture; 
 WHEREAS, the New Guarantors are Restricted Subsidiaries and
are eligible to guarantee the Notes; 
 WHEREAS, this Supplemental Indenture executed pursuant to Sections 4.19
and 10.03 of the Indenture shall evidence the Subsidiary Guarantee of the New Guarantors set forth in Section 10.01 of the Indenture; 
 WHEREAS, pursuant to Section 4.19, Section 9.01 and Section 10.03 of the Indenture, the Trustee, the Issuer and the New Guarantors are authorized to execute and
deliver this Supplemental Indenture and the New Guarantors are authorized to execute and deliver the Subsidiary Guarantee; 

WHEREAS, all acts and requirements necessary to make this Supplemental Indenture the legal, valid and binding obligation of the
Issuer and the New Guarantors have been done; 
 NOW THEREFORE, in consideration of the foregoing and for other good and
valuable consideration, the receipt of which is hereby acknowledged, the parties mutually covenant and agree for the equal and ratable benefit of the Holders of the Notes as follows: 

1. Capitalized Terms. Capitalized terms used in this Supplemental Indenture (including the recitals hereto) without definition
shall have the meanings set forth in the Indenture. 







 2. Agreement to Guarantee. Subject to Article Ten of the Indenture, each New
Guarantor hereby agrees, jointly and severally with the other Subsidiary Guarantors, to guarantee fully and unconditionally to each Holder of a Note and to the Trustee and its successors and assigns the payment and performance of the Notes and the
other obligations set forth in Section 10.01 of the Indenture and to be bound by all other applicable provisions of the Indenture and the Notes. Each New Guarantor acknowledges and agrees, pursuant to Section 10.03 of the
Indenture, that, upon its execution and delivery of this Supplemental Indenture, such New Guarantor shall be deemed to be a Subsidiary Guarantor for all purposes of the Indenture (including, without limitation, for purposes of Article Ten
thereof). 
 3. Ratification of Indenture; Supplemental Indenture Part of Indenture. Except as expressly amended hereby,
the Indenture is in all respects ratified and confirmed and all the terms, conditions and provisions thereof shall remain in full force and effect. This Supplemental Indenture shall form a part of the Indenture for all purposes, and every Holder of
Notes heretofore or hereafter authenticated and delivered shall be bound hereby. 
 4. Trustee’s Disclaimer. The
Trustee makes no representation or warranty as to the validity or sufficiency of this Supplemental Indenture. The recitals and the statements herein are deemed to be those of the Issuer and the New Guarantors and not of the Trustee. 

5. Governing Law. THIS SUPPLEMENTAL INDENTURE SHALL BE GOVERNED BY THE LAWS OF THE STATE OF NEW YORK. THE ISSUER, THE NEW
GUARANTORS AND THE TRUSTEE AGREE TO SUBMIT TO THE JURISDICTION OF THE COURTS OF THE STATE OF NEW YORK IN ANY ACTION OR PROCEEDING ARISING OUT OF OR RELATING TO THIS SUPPLEMENTAL INDENTURE. 

6. Successors. All agreements of the New Guarantors in this Supplemental Indenture shall bind its successors. 

7. Counterparts. This Supplemental Indenture may be executed in two or more counterparts, all of which shall be considered one and
the same agreement. 
 8. Effect of Headings. The Section headings herein are for convenience only and shall not affect
the construction thereof. 
 9. Conflict with the Trust Indenture Act. If any provision of this Supplemental Indenture
limits, qualifies or conflicts with any provision of the Trust Indenture Act of 1939 (the “TIA”) that is required under the TIA to be part of and govern any provision of this Supplemental Indenture, the provision of the TIA shall
control. If any provision of this Supplemental Indenture modifies or excludes any provision of the TIA that may be so modified or excluded, the provision of the TIA shall be deemed to apply to the Indenture as so modified or to be excluded by this
Supplemental Indenture. 







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

					
	The New Guarantors
	
	 Access One Communications Corp., a New Jersey corporation

	 Cavalier IP TV, LLC, a Delaware limited liability company

	 Cavalier Services, LLC, a Delaware limited liability company

	 Cavalier Telephone Corporation, a Delaware corporation

	 Cavalier Telephone Mid-Atlantic, L.L.C., a Delaware limited liability company

	 Cavalier Telephone, L.L.C., a Virginia limited liability company

	 CavTel Holdings, LLC, a Delaware limited liability company

	 Compco, Inc., a Delaware corporation

	 Elantic Networks, Inc., a Delaware corporation

	 Intellifiber Networks, Inc., a Virginia corporation

	 LDMI Telecommunications, Inc., a Michigan corporation

	 Network Telephone Corporation, a Florida corporation

	 NT Corporation, a Delaware corporation

	 OmniCall, Inc., a South Carolina corporation

	 SM Holdings, LLC, a Delaware limited liability company

	 Talk America Holdings, Inc., a Delaware corporation

	 Talk America of Virginia, Inc., a Virginia corporation

	 Talk America Inc., a Pennsylvania corporation

	 TC Services Holding Co., Inc., a Pennsylvania corporation

	 The Other Phone Company, Inc., a Florida corporation

		
	By:	 	 /s/ Mary K. O’Connell

	Name:	 	Mary K. O’Connell
	Title:	 	Senior Vice President, General Counsel and Secretary
	
	The Issuer
	
	PAETEC Holding Corp.
		
	By:	 	 /s/ Mary K. O’Connell

	Name:	 	Mary K. O’Connell
	 Title:
	 	Senior Vice President, General Counsel and Secretary



  








  

			
	The Trustee
	
	The Bank of New York Mellon
		
	By:	 	 /s/ Thomas J. Provenzano

	Name:	 	Thomas J. Provenzano
	Title: 	 	Vice President