Exhibit 10.1**FIRST AMENDMENT TO LEASE**     THIS FIRST AMENDMENT TO LEASE is effective as of the 31st day ofOctober, 2007 (the “Amendment”) by and between **RALEIGH FLEX OWNER I LLC,** a Delaware limited liability company (“Landlord”) (successor-in-interest to Duke RealtyLimited Partnership) and **CATAPULT COMMUNICATIONS CORPORATION,**a Nevada corporation (“Tenant”).WITNESSETH:     WHEREAS, Duke Realty Limited Partnership and Tenant entered into a certain Leasedated October 21, 2002 (the “Lease”) whereby Tenant leased approximately 30,835 rentablesquare feet of space located at 800 Perimeter Park Drive, Suite A, Morrisville, North Carolina27560 (the “Leased Premises”) located in EastRidge at Perimeter Park (formerly known asPerimeter Park) (the “Park”); and     WHEREAS, Duke Realty Limited Partnership transferred all right, title and interest in thePremises and the Lease to FirstCal Industrial 2 Acquisition, LLC, who then transferred all right,title and interest in the Premises and Lease to the Landlord; and     WHEREAS, the Lease shall expire on May 31, 2008 (the “Expiration Date”); and     WHEREAS, pursuant to Section 16.13 of the Lease (the Option to Extend) the Landlordand Tenant desire to renew and extend the Term of the Lease for an additional five (5) yearsfrom the Expiration Date; and     WHEREAS, the Landlord and Tenant desire to further amend and modify the Lease asprovided herein.     NOW, THEREFORE, in consideration of the mutual covenants and conditions containedherein, and other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto agree as follows:1. The foregoing recitals are true and correct and are incorporated herein by reference. Allcapitalized terms not defined herein shall have the meaning given to them in the Lease.2. Section 1.01 (C) of the Lease shall be deleted in its entirety and shall be replaced with thefollowing:     “C. Tenant’s Proportionate Share: 6.48% of the Park. The square footage of the Parkis 476,039 square feet. The determination of Tenant’s Proportionate Share shall conclusively bedeemed correct for all purposes hereunder. ”3. The Lease Term is renewed and extended for five (5) years from the Expiration Date (the“First Renewal Term”).
1

 
4. The Minimum Rent during the First Renewal Term shall be paid as follows:         **Per Square**    **Year** **Foot** **Monthly Rent** **Annual Rent**June 1, 2008- May 31, 2009 $9.56 $24,565.22 $294,782.64June 1, 2009- May 31, 2010 $9.80 $25,181.92 $302,183.04June 1, 2010- May 31, 2011 $10.05 $25,824.31 $309,891.72June 1, 2011- May 31, 2012 $10.30 $26,466.71 $317,600.52June 1, 2012- May 31, 2013 $10.56 $27,134.80 $325,617.605. The Landlord hereby represents and warrants that in the event the roof allows water tointrude into the Lease Premises, Landlord shall immediately repair the roof as necessary.Notwithstanding the foregoing, in the event the Landlord is unable to correct the roof byreasonable repair within twelve (12) months from the full execution of this Amendment byLandlord and Tenant, the Landlord shall cause the roof to be replaced.6. Landlord hereby grants to Tenant an option to renew the Lease for one (1) additionalLease Term of five (5) years in accordance with Section 16.13 of the Lease (the “Second Optionto Extend”). Tenant shall exercise the Second Option to Extend in strict compliance withSection 16.13 of the Lease.7. Landlord shall reimburse Tenant in an amount up to Ten Thousand Seven Hundred Fiftyand No/100 Dollars ($10,750.00) as an allowance (the “Improvement Allowance”) for the repairof the deck area of the Leased Premises, painting of the Leased Premises and replacing doorswithin the Leased Premises (the “Improvements”). The Improvement Allowance will be paid toTenant upon satisfaction of the following conditions: (i) submission by Tenant to Landlord of allpaid in full invoices for the Improvements; (ii) submissions by Tenant to Landlord of Tenant’scontractor’s sworn statement that all Improvements have been paid for in full which shall includeunconditional lien releases for all Improvements. Notwithstanding the foregoing, Landlord shallhave no obligation to disburse any portion of the Improvement Allowance to Tenant during anyperiod when Tenant is in default under the Lease. In the event the documents submitted byTenant substantiate that the amounts paid or incurred by Tenant for Improvements were less thanthe amount of the Improvement Allowance, the Improvement Allowance shall be reducedaccordingly.8. Section 16.14 of the Lease is hereby deleted in its entirety and shall have no further forceand effect.9. Except as amended hereby, the Lease shall be reaffirmed and all terms and conditions ofthe Lease are in full force and effect, and the parties hereto hereby ratify and affirm the termsand conditions of the Lease, as those terms and conditions are amended hereby.
2

 
10. This Amendment shall be binding upon and shall inure to the benefit of Landlord andTenant and their respective successors and assigns, and shall be construed under and enforceablein accordance with the laws of the State of North Carolina.[Signature Page to Follow]
3

 
     IN WITNESS WHEREOF, the parties have caused this instrument to be duly executed asof the day and year first above written.           TENANT:   LANDLORD:             **Catapult Communication Corporation,**   **Raleigh Flex Owner I LLC,**  a Nevada corporation   a Delaware limited liability company                   By: Raleigh Flex Investor LLC,          a Delaware limited liability company          Its Sole Member             By: /s/ Richard A. Karp                   Name: Richard A. Karp        Title: Chairman and CEO              By: Raleigh Flex Manager LLC,          a Michigan limited liability company          Its Manager                     By: /s/ Adam Lutz Adam Lutz, Manager  
4