Document:

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                                                                 Exhibit 10.1.18

                               WARRANT CERTIFICATE

THE WARRANTS REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED UNDER THE
SECURITIES ACT OF 1933 AND MAY NOT BE SOLD OR TRANSFERRED IN THE ABSENCE OF SUCH
REGISTRATION OR AN EXEMPTION THEREFROM UNDER SUCH ACT. SUCH WARRANTS MAY BE
TRANSFERRED ONLY IN COMPLIANCE WITH THE CONDITIONS SPECIFIED IN THE WARRANT
AGREEMENT, DATED AS OF JULY 16,1999, ("WARRANT AGREEMENT") BETWEEN THE ISSUER
AND THE INITIAL HOLDER OF THE WARRANTS THEREIN NAMED, A COMPLETE AND CORRECT
COPY OF WHICH IS AVAILABLE FOR INSPECTION AT THE PRINCIPAL OFFICE OF THE ISSUER
AND WILL BE FURNISHED TO THE HOLDER HEREOF UPON WRITTEN REQUEST AND WITHOUT
CHARGE. THIS WARRANT CERTIFICATE IS NOT TRANSFERRABLE EXCEPT UPON CONDITIONS SET
FORTH IN AND EXECUTION OF THE WARRANT AGREEMENT.

                    EXERCISABLE AT ANY TIME FROM TIME TO TIME

                       UNTIL TERMINATED IN ACCORDANCE WITH

                              THE WARRANT AGREEMENT

No. W-1

                               WARRANT CERTIFICATE

            This Warrant Certificate certifies that General Electric Capital
Corporation (the "Administrative Agent"), or registered assigns, is the
registered holder of 570,600 Warrants (the "Warrants") to purchase shares of
Common Stock of Advanced Telecommunications, Inc., a Minnesota corporation (the
"Issuer"). Each Warrant entitles the holder, subject to the conditions set forth
herein and in the Warrant Agreement, to purchase from the Issuer before 5:00.
P.M., local time, on any business day of the Issuer at any time or from time to
time until terminated in accordance with the Warrant Agreement (the "Expiration
Date"), one fully paid and nonassessable share of the Common Stock of the Issuer
(the "Shares") at a price of $.01 per share (the "Exercise Price"), payable in
lawful money of the United States of America, upon surrender of this Warrant
Certificate, execution of the annexed Form of Election to Purchase and payment
of the applicable Exercise Price at the office of the Issuer at 730 Second
Avenue South, Suite 1200, Minneapolis, Minnesota 55402 or such other address as
the Issuer may specify in writing to the registered holder of the Warrants
evidenced hereby (the "Warrant Office"). The Exercise Price and number of
Warrant Shares purchasable upon exercise of the Warrants are subject to
adjustment prior to the Expiration Date upon the occurrence of certain events as
set forth in Warrant Agreement.

            No Warrant may be exercised after 5:00 P.M., local time of the
Warrant Office, on the Expiration Date and all rights of the registered holders
of the Warrants shall cease after 5:00 P.M., local time of the Warrant Office,
on the Expiration Date.

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            The Issuer may deem and treat the registered holder(s) of the
Warrants evidenced hereby as the absolute owner(s) thereof (notwithstanding any
notation of ownership or other writing hereon made by anyone), for the purpose
of any exercise hereof and of any distribution to the holder(s) hereof, and for
all other purposes, and the Issuer shall not be affected by any notice to the
contrary.

            Warrant Certificates, when surrendered at the office of the Issuer
at the above-mentioned address by the registered holder hereof in person or by a
legal representative duly authorized in writing, may be exchanged, in the manner
and subject to the limitations provided in the Warrant Agreement, but without
payment of any service charge, for another Warrant Certificate or Warrant
Certificates of like tenor evidencing in the aggregate a like number of
Warrants.

            Upon due presentment for registration of transfer of this Warrant
Certificate at the Warrant Office, a new Warrant Certificate or Warrant
Certificates of like tenor and evidencing in the aggregate a like number of
Warrants shall be issued in exchange for this Warrant Certificate to the
transferee(s) and, if less than all the Warrants evidenced hereby are to be
transferred, to the registered holder hereof, subject to the limitations
provided in the Warrant Agreement, without charge except for any tax or other
governmental charge imposed in connection therewith.

            This Warrant Certificate is one of the Warrant Certificates referred
to in the Warrant Agreement dated as of July 16, 1999 between the Issuer and the
Administrative Agent (the "Warrant Agreement"). Said Warrant Agreement is hereby
incorporated by reference in and made a part of this instrument and is hereby
referred to for a description of the rights, limitation of rights, obligations,
duties and immunities thereunder of the Issuer and the holders.

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            IN WITNESS WHEREOF, the Issuer has caused this Warrant Certificate
to be signed by its duly authorized officers on this the 19th day of July, 1999.

                                       ADVANCED TELECOMMUNICATIONS, INC.

                                       By: /s/ Michael A. Donchve
                                           -------------------------------------
                                           Name:  Michael A. Donchve
                                           Title: Treasurer

ATTEST:

By: /s/ Richard Smith
    ----------------------------
    Name: Richard Smith
    Title:

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                          FORM OF ELECTION TO PURCHASE

                 [To be executed only upon exercise of Warrant]

            The undersigned registered owner of this Warrant irrevocably
exercises this Warrant for the purchase of __________ shares of Common Stock of
Advanced Telecommunications, Inc., and herewith makes payment therefor, all at
the price and on the terms and conditions specified in this Warrant and requests
that certificates for the shares of Common Stock hereby purchased (and any
securities or other property issuable upon such exercise) be issued in the name
of and delivered to ______________ whose address is ____________________ and, if
such shares of Common Stock shall not include all of the shares of Common Stock
issuable as provided in this Warrant, that a new Warrant of like tenor and date
for the balance of the shares of Common Stock issuable hereunder be delivered to
the undersigned.

                                       _________________________________________
                                       (Name of Registered Owner)

                                       _________________________________________
                                       (Signature of Registered Owner)

                                       _________________________________________
                                       (Street Address)

                                       _________________________________________
                                       (City)          (State)        (Zip Code)

NOTICE:  The signature on this subscription must correspond with the name as
         written upon the face of the Warrant in every particular, without
         alteration or enlargement or any change whatsoever.

                                       4<PAGE>

                                                                 Exhibit 10.1.19

                            NONCOMPETITION AGREEMENT

      THIS AGREEMENT, entered into as of this _____ day of _______, 19__, by and
between ADVANCED TELECOMMUNICATIONS, INC., a Minnesota corporation ("ATI") and
_______________________ ("Employee")

      Employee recently commenced [his/her] employment with ATI. ATI has
provided Employee with certain incentive stock options conditioned upon
[his/her] agreement to enter into this Noncompetition Agreement.

      NOW, THEREFORE, for good and valuable consideration, the parties agree as
follows:

      1. Definitions. The following definitions are used in this Agreement:

            "Confidential Information" means information learned or acquired by
      Employee during Employee's employment by any Related Entity, including
      without limitation, (i) all technical information relating to any Related
      Entity; (ii) any information concerning any marketing programs or
      strategies sued by any Related Entity, or any product or service under
      development by, or being tested by, any Related Entity but not yet offered
      for sale; (iii) any information concerning the pricing policies or the
      prices charged by any Related Entity to any Customer, the volume of orders
      of any Customer, any bids or negotiations being submitted by or being
      conducted by any Related Entity and all other information concerning the
      transactions of any Related Entity with any Customer or proposed Customer;
      (iv) any financial information concerning the salaries or wages paid to,
      the work records of or any other personnel information relating to any
      employee of any Related Entity; and (v) any other information determined
      by any Related Entity to be confidential and proprietary and which is
      identified as confidential and proprietary prior to or at the time of its
      disclosure to Employee.

            "Customer" means (i) any person which, at any time during the term
      of Employee's employment by any Related Entity purchased products or
      services from, or was solicited to purchase products or services from any
      Related Entity, and (ii) during the Restricted Period, any person which,
      at any time during the 2 year period immediately prior to the date of
      termination of Employee's employment with the Related Entities, purchased
      products or services from, or was solicited to purchase products or
      services from, any Related Entity.

            "Related Entity" means ATI and any other person which ATI directly
      or indirectly controls and any other affiliate of ATI for which Employee
      performs services or about which Employee has Confidential Information at
      any time during the 2-year period immediately preceding the termination of
      Employee's employment with any such entity.

            "Restricted Period" means the 2-year period immediately following
      the date Employee ceases to be an employee of any Related Entity.
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            "Restricted Territory" means any of those counties in which any
      Related Entity makes material sales during the term of Employee's
      employment by any Related Entity and any location within 50 miles of such
      counties.

            "Subject Businesses" means (i) during the term of Employee's
      employment with any Related Entity, those businesses conducted by any
      Related Entity, and (ii) during the Restricted Period, any businesses
      conducted by any Related Entity at any time during the 2-year period
      immediately prior to the date of termination of Employee's employment.

            "Subject Products" means (i) during the term of Employee's
      employment with any Related Entity, the types of products and services
      which any Related Entity sold, serviced, leased or maintained, and (ii)
      during the Restricted Period, the types of products which any Related
      Entity sold, serviced, leased or maintained at any time during the 2-year
      period immediately prior to the date of termination of Employee's
      employment with the Related Entities.

            "Supplier" means (i) during the term of Employee's employment with
      any Related Entity, any Person which sold products or services to any
      Related Entity, and (ii) during the Restricted Period, any Person which,
      at any time during the 2-year period immediately prior to the date of
      termination of Employee's employment with the Related Entities, sold
      products or services to any Related Entity.

      2. Non-Competition. Employee will not, during [his/her] employment by any
Related Entity or after such employment during the Restricted Period, directly
or indirectly, whether as agent, stockholder (except as the holder of not more
than 5% of the stock of a publicly held company, provided Employee does not
participate in the business of that company or render advice or assistance to
it), employee, officer, director, trustee, partner, consultant, proprietor or
otherwise, except on behalf of the Related Entities;

            (a) Acquire an ownership interest in, engage in or render advice or
      assistance to any business which sells, services, leases or otherwise
      maintains any of the Subject Products or which otherwise competes with the
      Subject Businesses anywhere within the Restricted Territory.
      Notwithstanding the foregoing, Employee may be employed by:

                  (i) any customer of any of the Subject Businesses after the
            termination of Employee's employment with the Related Entities,
            provided such customer does not conduct a business which sells,
            services, leases or maintains any of the Subject Products or which
            otherwise competes with the Subject Businesses anywhere within the
            Restricted Territory;

                  (ii) any competitor of any of the Subject Businesses after the
            termination of Employee's employment with the Related Entities,
            provided all of the following conditions are satisfied: (A) Employee
            does not perform any services for such competitor in the Restricted
            Territory; and (B) Employee does not any time violate

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            any of the other provisions of this Agreement in the course of the
            performance of services for such competitor.

            (b) Entice or attempt to entice any of the Suppliers or Customers to
      cause, or attempt to cause, any Supplier or Customer not to do business,
      or reduce its business, with any Related Entity.

            (c) Hire or attempt to hire any employees, contractors or agents of
      any Related Entity, or attempt to induce any of those parties to leave
      their employment relationship with any Related Entity.

      3. Confidential Information. Employee will not at any time during the term
of Employee's employment by any Related Entity or thereafter during the
Restricted Period disclose any Confidential Information to any person other than
an employee or agent of any Related Entity having the need to know that
information in the ordinary course of business.

      4. Remedies in the Event of Breach. Employee recognizes that irreparable
injury may result to the Related Entities if Employee breaches the restrictions
imposed by this Agreement. Employee's engagement in any act in violation of this
Agreement will entitle the Related Entities, and each of them, in addition to
any other remedies and damages available to them, to an injunction prohibiting
Employee from engaging in such act.

      5. Reasonableness of Restrictions. By entering into this Agreement,
Employee acknowledges (i) that Employee is familiar with the nature of the
Subject Businesses and the Subject Products; (ii) that Employee has read and
understands the nature and scope of the restrictions imposed by this Agreement;
and (iii) that the Related Entities have invested and will continue to invest
substantial effort and sums of money to develop and promote the Subject Products
and goodwill of the Related Entities. EMPLOYEE THEREFORE ACKNOWLEDGES AND
REPRESENTS THAT THE SCOPE OF THOSE RESTRICTIONS ARE APPROPRIATE, NECESSARY AND
REASONABLE FOR THE PROTECTION OF THE BUSINESS, GOODWILL AND PROPERTY RIGHTS OF
THE RELATED ENTITIES AND WILL NOT PREVENT EMPLOYEE FROM EARNING A LIVING
SUBSEQUENT TO THE DATE OF THIS AGREEMENT.

      6. Assignment. ATI may not assign this Agreement without the written
consent of Employee; provided, however, that (a) upon the transfer of
substantially all of the assets of or a change of control of ATI, this Agreement
will inure to the benefit of the successor employer, and (b) ATI may assign this
Agreement to any person controlled by, controlling or under common control with
ATI. This Agreement will bind and inure to the benefit of the parties to this
Agreement, their respective successors, assigns, heirs and legal
representatives.

      7. Invalidity, Modification. If a court rules that any part of this
Agreement is unenforceable, the unenforceable part may be modified by the court
to make it enforceable, or it may be severed and the other parts of the
Agreement will remain enforceable.

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      8. Governing Law and Choice of Forum. This Agreement is governed by and
will be construed in accordance with the internal laws of the State of
Minnesota. All suits with respect to this Agreement must be heard by courts
having their forum within the State of Minnesota.

                                    ATI:

                                    ADVANCED TELECOMMUNICATIONS, INC.

                                    By________________________________________
                                    Its_______________________________________

                                    EMPLOYEE:

                                    _________________________________________
                                    [insert Employee name]

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