Exhibit 4.1

                             	LOAN AGREEMENT 
 
 
	This Loan Agreement (this "Agreement"), made as of the 28th day of March,
 1995, by and between AMERICAN NATIONAL BANK AND TRUST COMPANY OF CHICAGO
 ("Bank"), a national banking association with its principal place of
 business at 33 North LaSalle Street, Chicago, Illinois 60690, and
 CORCOM, INC., ("Borrower"), a corporation with its principal place of
 business at 844 East Rockland Road, Libertyville, Illinois, has reference
 to the following facts and circumstances: 
 
	Pursuant to Borrower's request, Bank will lend monies to Borrower pursuant
 hereto. 
 
	NOW, THEREFORE, in consideration of the promises set forth herein, Borrower
 agrees to borrow monies from Bank, and Bank agrees to lend monies to
 Borrower, upon the following terms and conditions. 
 
 
	1.  DEFINITIONS AND TERMS 
 
	1.1	The following words, terms and/or phrases shall have the meanings set
 forth thereafter and such meanings shall be applicable to [singular and
 plural form thereof, giving effect to the numerical difference; whenever
 the context so requires], the use of "it" in reference to Borrower shall
 mean Borrower as identified at the beginning of this Agreement:  
 
	A.	"Borrower's Liabilities":  all obligations and liabilities of Borrower
 to Bank (including without limitation all debts, claims, and indebtedness)
 whether primary, secondary, direct, contingent, fixed or otherwise,
 heretofore, now and/or from time to time hereafter owing, due or payable,
 however evidenced, created, incurred, acquired or owing and however arising,
 whether under this Agreement or the "Other Agreements" (hereinafter defined)
 or operation of law or otherwise. 
 
	B.	"Charges":  all national, federal, state, county, city, municipal and/or
 other governmental (or any instrumentality, division, agency, body or
 department thereof, including without limitation the Pension Benefit
 Guaranty Corporation) taxes, levies, assessments, charges, liens, claims or
 encumbrances upon and/or relating to the Borrower's Liabilities, Borrower's
 business, Borrower's ownership and/or use of any of its assets, and/or
 Borrower's income and/or gross receipts. 
 
	C.	"Indebtedness":  (i) indebtedness for borrowed money or for the deferred
 purchase price of property or services, (ii) obligations as lessee under
 leases which shall have been or should be, in accordance with generally
 accepted accounting principles, recorded as capital leases, (iii)
 obligations under direct or indirect guaranties in respect of, and
 obligations (contingent or otherwise) to purchase or otherwise acquire, or
 otherwise to assure a creditor against loss in respect of, indebtedness or
 obligations of others of the kinds referred to in clauses (i) or (ii) above,
 and (iv) liabilities in respect of unfunded vested benefits under plans
 covered by Title IV of the Employee Retirement Income Security Act of 1974,
 as the same may be amended and in effect from time to time. 
 
	D.	"Other Agreements":  all agreements, instruments and documents, including
 without limitation guaranties, mortgages, deeds of trust, notes, pledges,
 powers of attorney, consents, assignments, contracts, notices, security
 agreements, leases, financing statements and all other written matter
 heretofore, now and/or from time to time hereafter executed by and/or on
 behalf of Borrower and delivered to Bank. 
 
	E.	"Persons":  any individual, sole proprietorship, partnership, joint
 venture, trust, unincorporated organization, association, corporation,
 institution, entity, party or government (whether national, federal, state,
 county, city, municipal or otherwise, including without limitation, any
 instrumentality, division, agency, body or department thereof). 
 
	1.2	Except as otherwise defined in this Agreement or the Other Agreements,
 all words, terms and/or phrases used herein and therein shall be defined by
 the applicable definition therefor (if any) in the Uniform Commercial Code
 of the State of Illinois. 
 
 
	2.  LOANS 
 
	2.1	Loans made by Bank to Borrower pursuant to this Agreement shall be
 evidenced by notes or other instruments issued or made by Borrower to Bank.
 Except as otherwise provided in this Agreement or in any notes executed and
 delivered by Borrower to Bank in connection herewith, the principal portion
 of Borrower's Liabilities shall be payable by Borrower to Bank on the
 maturity date(s) described in any such note(s) (as the same may be amended
 or renewed) and all costs, fees and expenses payable hereunder or under the
 Other Agreements, shall be payable by Borrower to Bank on demand, in either
 case at Bank's principal place of business or such other place as Bank shall
 specify in writing to Borrower. 
 
	2.2	Notwithstanding anything contained in this Agreement or the Other
 Agreements to the contrary, the principal portion of Borrower's Liabilities
 outstanding at any one time shall not exceed the lesser of $4,000,000.00 in
 the aggregate and (ii) the "Borrowing Base" as hereinafter defined.  
 
	2.3	Each loan made by Bank to Borrower pursuant to this Agreement or the
 Other Agreements shall constitute an automatic warranty and representation
 by Borrower to Bank that there does not then exist an "Event of Default"
 (as hereinafter defined) or any event or condition which with notice, lapse
 of time and/or the making of such loan would constitute an Event of Default.
 
 	2.4	This Agreement shall be in effect until all of Borrower's Liabilities
 have been paid in full and any and all commitments of Bank to make loans
 have terminated. 
 
	2.5	Bank's commitment to loan shall expire on the earlier of (i) the date on
 which Borrower's Liabilities mature under the terms of any note given by
 Borrower to Bank evidencing such liabilities, or (ii) the occurrence of the
 Event of Default pursuant to Section 7 hereof. 
 
	2.6	Provided that an Event of Default does not then exist or would not then
 be created thereby or any event which with notice or lapse of time or both
 would constitute an Event of Default does not then exist, Bank shall loan to
 Borrower an amount (the "Borrowing Base") equal to (i) the sum of 80% of the
 face amount (less maximum discounts, credits and allowances which may have
 been taken by or granted to obligors in connection therewith) of all then
 existing "Eligible Accounts" (as hereinafter defined) that are scheduled on
 the initial Schedule of Accounts delivered to Bank, and (ii) the sum of 80%
 of the face amount (less maximum discounts, credits and allowances which may
 be taken by or granted to Obligors in connection therewith) of all then
 existing Eligible Accounts that are scheduled on each related subsequent
 Schedule of Accounts delivered to Bank (excepting therefrom those Eligible
 Accounts theretofore scheduled to Bank on the initial Schedule of Accounts
 or any subsequent Schedule of Accounts delivered to the Bank theretofore).
 Upon Bank's request therefore, Borrower shall attach to each Schedule of
 Accounts a true and correct copy of such invoices, delivery receipts and
 other documents relating to the account's scheduled thereon, as Bank may
 request.   
 
	2.7 An "Eligible Account" is an Account of Borrower which meets each of the
 following requirements: (a) if it arises from the sale or lease of goods,
 such goods have been shipped or delivered to the Obligor thereof; (b) it is
 valid, legally enforceable obligation of the Obligor thereunder, to the
 extent it is not subject to any offset, counterclaim or other defense on the
 part of such Obligor denying liability thereunder in whole or in part: (c)
 it is not subject to any lien or security interest whatsoever, except those
 of Bank; (d) it is evidenced by an invoice (dated not later than the date of
 shipment to the Obligor or performance and having a due date not more than
 30 days after the date of invoice) rendered to such Obligor, and is not
 evidenced by any instrument or chattel paper; (e) it is payable in United
 States dollars; (f) it is not owing by any Obligor involved in any
 bankruptcy or insolvency proceeding; (g) it is not owing by any affiliate of
 Borrower; (h) it is not unpaid more than 90 days after the date of such
 invoice; (i) it is not owing by an Obligor which then shall have failed to
 pay in full any invoice evidencing any account within 90 days after the date
 of such invoice, unless the total invoice amounts of such Obligor which then
 have not been paid within 90 days of the date of such invoice represent less
 than 25% of the total invoice amounts then outstanding of such Obligor; and
 (j) it is not an Account as to which Bank, at any time or times hereafter,
 reasonably determines, in good faith, that the prospect of payment or
 performance by the Obligor thereof is or will be impaired.  An Account which
 is at any time an Eligible Account, but which subsequently fails to meet any
 of the foregoing requirements, shall forthwith cease to be an Eligible
 Account.  Borrower, immediately upon demand from Bank, shall pay to Bank an
 amount of money equal to the monies theretofore advanced Bank to Borrower
 upon an Account that is no longer an Eligible Account. Borrower warrants and
 represents to and covenants with Bank that the aggregate of the then
 outstanding amounts (less maximum discounts, credits and allowances which
 may be taken by or granted to Obligors in connection therewith) of all then
 existing Eligible Accounts shall at all times hereafter be at least 125% of
 the principal portion of Borrower's Liabilities represented by loans made
 by Bank to Borrower pursuant to paragraph 2.6 above. 
 
	2.8	With respect to Eligible Accounts, except as otherwise disclosed by
 Borrower to Bank in writing, Borrower warrants and represents to Bank that:
 (a) they are genuine, in all respects what they purport to be and are not
 evidenced by a judgment; (b) they represent undisputed, bona fide
 transactions completed in accordance with the terms and provisions contained
 in the invoices and other documents delivered to Bank with respect thereto;
 (c) the amounts thereof, which may be shown on any Schedule of Accounts
 and/or all invoices and statements delivered to Bank with respect thereto,
 are actually and absolutely owing to Borrower and are not contingent for any
 reason; (d) no payments have been or shall be made thereon except payments
 immediately delivered to Bank pursuant to this Agreement; (e) there are no
 setoffs, counterclaims or disputes existing or asserted with respect thereto
 and Borrower has not made any agreement with any Obligor thereof for any
 deduction therefrom except a regular discount allowed by Borrower in the
 ordinary course of its business for prompt payment; (f) there are no facts,
 events or occurrences which in any way impair the validity or enforcement
 thereof or tend to reduce the amount payable thereunder from the amount
 thereof, which may be shown on any Schedule of Accounts and on all invoices
 and statements delivered to Bank with respect thereto; (g) to the best of
 Borrower's knowledge, all Obligors thereof have the capacity to contract and
 are solvent; (h) the services furnished and/or goods sold giving rise
 thereto are not subject to any lien, claim, encumbrance or security interest
 except that of Bank; (i) Borrower has no knowledge of any fact or
 circumstance which would impair the validity or collectability thereof;
 (j) to Borrower's knowledge, there are no proceedings or actions which are
 threatened or pending against any Obligor thereof which might result in any
 material adverse change in its financial condition; and (k) the Obligors
 thereof are not located in Minnesota or New Jersey, or if so located,
 Borrower has filed a Notice of Business Activities Report with the New
 Jersey Division of Taxation or Minnesota Department of Revenue for the
 then current year. 
 
	2.9	Any of Bank's officers, employees or agents shall have the right, at any
 time or times hereafter, in Bank's name or in the name of a nominee of Bank,
 to verify the validity, amount or any other matter relating to any Accounts
 by mail, telephone, telegraph or otherwise.  All reasonable costs, fees and
 expenses relating thereto incurred by Bank (or for which Bank becomes
 obligated) shall be part of Borrower's Liabilities, payable by Borrower to
 Bank on demand. 
 
 
	3.  NEGATIVE PLEDGE 
 
	3.1	Borrower shall not, and shall not permit any of its subsidiaries to
 create, incur, permit, or suffer to exist any lien upon any of its property
 or assets, now owned or hereafter acquired, except for the following
 permitted liens:  (a) pledges or deposits made to secure payment of worker's
 compensation insurance; (b) liens imposed by mandatory provisions of law
 such as for materialmen, mechanics, warehousemen and other liens arising in
 the ordinary course of business; (c) liens for taxes, assessments and
 governmental charges or levies imposed upon the Borrower's income or profits
 or property, if the same are not yet due and payable or if the same are
 being contested in good faith and as to which adequate cash reserves have
 been provided; (d) liens arising out of good faith deposits in connection
 with tenders, leases, real estate bids or contracts (other than contracts
 involving the borrowing of money), pledges, or deposits to secure (or in
 lieu of) surety, stay, appeal or customs bonds and deposits to secure the
 payment of taxes, assessments, customs duties or similar charges; and (e)
 encumbrances consisting of zoning restrictions, easements, or other
 restrictions on the use of real property, provided that such items do not
 materially impair the use of such property for the purposes intended by
 Borrower, and none of which is violated by existing structures or land use.
  
 
4.  WARRANTIES, REPRESENTATIONS AND
 COVENANTS:	INSURANCE AND TAXES 
 
	4.1	Borrower, at its sole cost and expense, shall keep and maintain
 business interruption insurance and public liability and property damage
 insurance.  All such policies of insurance shall be in form, with insurers
 and in such amounts as may be reasonably satisfactory to Bank.  Borrower
 shall deliver to Bank the original (or certified) copy of each policy of
 insurance, or a certificate of insurance. 
 
	4.2	Borrower shall pay promptly, when due, all of the Charges, and shall not
 permit the Charges to arise, or to remain and will promptly discharge the
 same except to the extent the same are contested in good faith and as to
 which adequate reserves have been provided. 
 
 
	5.  WARRANTIES, REPRESENTATIONS AND 
COVENANTS:  GENERAL 
 
	5.1	Borrower warrants and represents to and covenants with Bank that:
 (a) Borrower has the right, power and capacity and is, or upon execution
 will be, duly authorized and empowered to enter into, execute, deliver and
 perform this Agreement and Other Agreements; (b) the execution, delivery
 and/or performance by Borrower of this Agreement and Other Agreements shall
 not, by the lapse of time, the giving of notice or otherwise, constitute a
 violation of any applicable law or a breach of any provision contained in
 Borrower's Articles of Incorporation, By-Laws, Articles of Partnership or
 similar document, or contained in any agreement, instrument or document to
 which Borrower is now or hereafter a party or by which it is or may be
 bound; (c) Borrower is now and at all times hereafter shall be solvent and
 generally paying its debts as they mature and Borrower now owns and shall at
 all times hereafter own property which, at a fair valuation, is greater than
 the sum of its debts; (d) Borrower is not and will not be during the term
 hereof in violation of any applicable federal, state or local statute,
 regulation or ordinance, in any respect materially and adversely affecting
 its business, property, assets, operations or condition, financial or
 otherwise; and (e) Borrower is not in default with respect to any indenture,
 loan agreement, mortgage, deed or other similar agreement relating to the
 borrowing of monies to which it is a party or by which it is bound. 
 
	5.2	Borrower warrants and represents to and covenants with Bank that
 Borrower shall not, without Bank's prior written consent thereto:  (a)
 enter into any transaction not in the ordinary course of business which
 materially and adversely affects Borrower's ability to repay Borrower's
 Liabilities or Indebtedness; (b) other than as specifically permitted in or
 contemplated by this Agreement, encumber, pledge, mortgage, sell, lease or
 otherwise dispose of or transfer, whether by sale, merger, consolidation or
 otherwise, any of Borrower's assets, other than sales in the ordinary course
 of business; and (c) incur Indebtedness except renewals or extensions of
 existing Indebtedness and interest thereon, except ordinary trade payables,
 and except other Indebtedness that is unsecured and is to Persons who
 execute and deliver to Bank in form and substance acceptable to Bank and its
 counsel subordination agreements subordinating their claims against Borrower
 therefor to the payment of Borrower's Liabilities. 
 
	5.3	 Borrower covenants with Bank that Borrower shall furnish to Bank:
 (a) as soon as available but not later than ninety (90) days after the
 close of each fiscal year of Borrower, financial statements of Borrower
 prepared in accordance with generally accepted accounting principles,
 consistently applied, audited by a firm of independent certified public
 accountants selected by Borrower and reasonably acceptable to Bank; (b)
 as soon as available but not later than thirty (30) days after the end of
 each calendar quarter hereafter, financial statements (10Q's) of Borrower
 certified by Borrower to be prepared in accordance with generally accepted
 accounting principles and to present fairly the financial position and
 results of operations of Borrower for such period; and (c) such other data
 and information (financial and otherwise) as Bank, from time to time, may
 request. 
 
	5.4  Borrower covenants with Bank the following:   
 
		A. 	Borrower shall not permit its ratio of Cash Flow Available to Debt
 Service ("Cash Flow Ratio") to be less than 1.25:1.00.  For purposes of the
 Cash Flow Ratio, "Cash Flow Available" on any date means the Borrower's
 earnings before interest and taxes, plus (i) the Borrower's depreciation,
 amortization and other "non-cash expense items" (ii) plus or minus net
 changes in deferred taxes and LIFO adjustments less (iii) the Borrower's
 cash payments for capital expenditures not reflected as an expense, net of
 any borrowings to support the expenditures.  For the purposes of Cash Flow
 Ratio, "Debt Service" on any date means the sum of the following:  (i) actual
 amount of total principal and interest payments that Borrower's obligated to
 the Bank during the period; (ii) actual amount of total principal and
 interest payments Borrower is obligated to make to financing sources other
 than the Bank during the period; (iii) anticipated tax payments for the
 current period; and (iv) any other cash distributions including, but not
 limited to, dividends or stock repurchases.  
 
		B. 	Borrower shall not permit the ratio of its total debt ("Total Debt") to
 Tangible Net worth ("TNW") to at any time be greater than or equal to
 1.0:1.0.  As used in this Agreement, Total Debt shall mean as of any time
 the aggregate of all indebtedness, obligations, liabilities, reserves and/or
 other items which will be listed as a liability on the balance sheet of
 Borrower in accordance with generally accepted accounting principles.  TNW
 shall mean the value of the assets of Borrower after subtracting therefrom
 the aggregate of any intangible assets of Borrower, including without
 limitation, prepaids, other accounts receivable, goodwill, franchises,
 licenses, patents, trademarks, tradenames, copyrights and brand names, minus
 the aggregate of all contingent and non-contingent liabilities of Borrower.  
 
		C. 	Borrower shall not declare or pay a Dividend if such Dividend plus any
 Dividends paid in the previous three calendar quarters exceeds Borrower's
 Net Income of the previous four calendar quarters.  "Net Income" shall mean
 Net Income as set forth in Borrower's Financial Statements supplied to Bank
 pursuant to Section 5.3, of this Agreement.  "Dividend" shall mean a
 distribution of Borrower's assets to shareholders.  
 
 
	6.  SETOFF AND SPRINGING LIEN 
 
	6.1	To assure the prompt payment to Bank of Borrower's Liabilities and the
 prompt, full and faithful performance by Borrower of all the provisions to
 be kept, observed or performed by Borrower under this Agreement and/or the
 Other Agreements, Borrower expressly acknowledges Bank's right to setoff
 all of Borrower's now or hereafter existing monies, reserves, deposits,
 deposit accounts and interest given thereon, securities, cash, cash
 equivalents and other property now or at any time or times hereafter in
 possession or control of Bank or its bailee.   
 
	6.2	Springing Lien.  To secure the prompt payment to Bank of Borrower's
 Liabilities and the prompt, full and faithful performance by Borrower of
 all the provisions to be kept, observed or performed by Borrower under this
 Agreement and/or the Other Agreements, Borrower conditionally grants to Bank
 a security interest in and to and collaterally assigns to Bank, the
 following property, wherever located, whether now or hereafter existing,
 owned, licensed, leased (to the extent Borrower's ownership interest
 therein) arising and/or acquired, of Borrower's (i) accounts (sometimes
 hereinafter individually and collectively referred to as "Accounts") and all
 goods from the sale, lease or other disposition by Borrower and giving rise
 to Accounts and have been returned to or repossessed or stopped in transit
 by Borrower; (ii) inventory; (iii) liens, guaranties or other rights and
 privileges pertaining to any of the collateral; (iv) all accessions to the
 foregoing and all substitutions, renewals, improvements or replacements or
 additions to the foregoing; (v) all books, records and computer records in
 way relating to the collateral herein described; and (vi) all products and
 proceeds of the foregoing, including without limitation proceeds of
 insurance policies insuring the foregoing (individually and collectively,
 also the "collateral" upon effectiveness of Bank's lien thereof, but prior
 to such effectiveness, the "Future Collateral").  Borrower shall make all
 appropriate entries upon its financial statements and its books and records
 disclosing the Bank's security interest in the Collateral but no such entry
 shall be made with regard to Future Collateral unless and until Bank's lien
 thereon becomes effective.  The term "Accounts" shall include any and all
 now existing or hereafter arising rights to payment or amounts due Borrower
 in the form of obligations or receivables from whatever source for services
 rendered or products sold or leased.  Prior to a default, nothing contained
 in this Agreement shall inhibit Borrower's ability to sell its inventory in
 the ordinary course of business. 
 
	The grant of security contained in this Section 6.2 (the "Future Security
 Lien") shall only become effective upon the violation by Borrower of
 covenants set forth in Section 5.4 of this Agreement, or any Event of
 Default under this Agreement or the Other Agreements (the "Triggering
 Conditions").   
 
	Concurrent with the execution of this Agreement, Borrower shall deliver to
 Bank UCC-1 Financing Statements covering the property subject to the Future
 Security Lien fully and properly executed by Borrower in a form and
 substance acceptable to Bank.  Bank shall have no right to record the
 above-mentioned UCC-1 Financing Statements covering the property subject to
 the Future Security Lien until one of the Triggering Conditions shall occur.
 If a Triggering Condition shall occur, Bank shall be entitled to file or
 record any and all of the Future Lien Documents.  Borrower shall cooperate
 with Bank in accomplishing the attachment and perfection of the future lien.
 If the Bank does not perfect all or any part of the Future Security Lien at
 the time of a Triggering Condition, this shall not constitute a waiver of the
 Bank's right to perfect such liens at a later time.   
 
	6.3	All of Borrower's Liabilities shall constitute one loan secured by Bank's
 security interest in the collateral and by all other security interest,
 liens, claims and encumbrances heretofore now and/or from time to time
 granted by Borrower to Bank.  
 
	6.4	Borrower shall now and hereafter execute and deliver to Bank, at the
 request of Bank, all agreements, instruments and documents (the
 "Supplemental Documentation") that Bank may reasonably request in a form and
 substance acceptable to Bank, to perfect and maintain perfected Bank security
 interest in the collateral and to consummate the transaction contemplated in
 or by this Agreement or the Other Agreement.  Borrower agrees that a carbon,
 photographic or photostatic copy, or other reproduction of this Agreement or
 of any financing statement shall be sufficient as a financing statement.  
 
	6.5	Bank shall have the right, at any time during Borrower's usual business
 hours, to inspect the Collateral or Future Collateral and all related records
 and to verify the amount in condition of any other matter relating to the
 Collateral or Future Collateral.  
 
	6.6	Upon an Event of Default, Borrower shall receive, for the Bank and as
 trustee for Bank, all monies, checks, notes, drafts and all other payment for
 and/or proceeds of collateral and future collateral which may come into the
 possession or under the control of Borrower and immediately receipt thereof,
 Borrower shall remit the same (or cause the same to be remitted) in kind, to
 Bank or at Bank's direction. 
 
	6.7	Upon an Event of Default, Bank, in its sole and absolute discretion, may
 take control, in any manner, and may endorse Borrower's name to any of the
 items in payment or proceeds provided in Paragraph 6.6 above and shall apply
 the same to and on account of Borrower's Liabilities.  
 
	6.8	Bank, in its sole and absolute discretion, may at any time or times
 hereafter, but shall not be under any obligation to pay, acquire or accept
 an assignment of any security interest, lien, encumbrance or claim asserted
 by any person or entity against the Collateral other than a permitted lien
 under paragraph 3.1.   
 
	6.9	In no event shall Borrower make any sale, transfer or other disposition
 of any of the Collateral or Future Collateral except as authorized by this
 Agreement or in writing executed by Bank and delivered to Borrower.  Nothing
 contained herein shall limit Borrower's ability to sell inventory in the
 normal course of business prior to a default.  No such authorization given
 by Bank to sell or specify any portion of Collateral or any items thereof,
 and no waiver by Bank in connection therewith shall establish or constitute
 a waiver or the prohibition of the prohibition contained in this Agreement
 against the sales, but except any portion or any item thereof not covered by
 such authorization.  
 
 
	7.  DEFAULT 
 
	7.1	The occurrence of any one of the following events shall constitute a
 default ("Event of Default"):  (a) if Borrower fails or neglects to perform,
 keep or observe any term, provision, condition, covenant, warranty or
 representation contained in this Agreement or in the Other Agreements and
 the same is not remedied or cured within thirty (30) days, which is required
 to be performed, kept or observed by Borrower; (b) if Borrower fails to pay
 any of Borrower's Liabilities, when due and payable or declared due and
 payable within five (5) days of such due date; (c) if any of Borrower's
 assets are attached, seized, subjected to a writ of distress warrant, or are
 levied upon, or become subject to any lien, or come within the possession of
 any receiver, trustee, custodian or assignee for the benefit of creditors;
 (d) if Borrower becomes insolvent or generally fails to pay, or admits in
 writing its inability to pay, debts as they become due, if a petition under
 Title 11, United States Code or any similar law or regulation shall be filed
 by or against Borrower, and if filed against Borrower is not dismissed within
 sixty (60) days of such filing, or if Borrower shall make an assignment for
 the benefit of its creditors or if any case or proceeding is filed by or
 against Borrower or if Borrower shall make an assignment for the benefit of
 its creditors or if any case or proceeding is filed by or against Borrower
 for its dissolution or liquidation, or if Borrower is enjoined, restrained or
 in any way prevented by court order from conducting all or any material part
 of its business affairs; (e) if a notice of lien, levy or assessment if filed
 of record or given to Borrower with respect to all or any substantial part of
 Borrower's assets by any federal, state or local department or agency; (f) if
 a contribution failure occurs with respect to any pension plan maintained by
 Borrower or any corporation, trades or business that is, along with Borrower,
 a member of a controlled group of corporations or controlled group of trades
 or businesses (as described in Section 414(b) and (c) of the Internal Revenue
 Code of 1986 or Section 4001, of the Employee Retirement Income Security Act
 of 1974, as amended ("ERISA")) sufficient to give rise to a lien under
 Section 302(f) of ERISA; (g) if Borrower is in default in the payment of any
 obligations, indebtedness or other liabilities in excess of $50,000 to any
 third parties and such default is declared and is not cured within the time,
 if any, specified therefor in any agreement governing the same; (h) the
 occurrence of a default (subject to applicable grace or cure periods) or an
 Event of Default under any of the Other Agreements; or (i) the reasonable
 insecurity of Bank. 
 
	7.2  All of Bank's rights and remedies under this Agreement and the Other
 Agreements are cumulative and non-exclusive. 
 
	7.3  Upon an Event of Default without notice by Bank to or demand by Bank of
 Borrower, Bank shall have no further obligation to any may then forthwith
 cease advancing monies or extending credit to or for the benefit of Borrower
 under this Agreement and the Other Agreements.  Upon an Event of Default,
 without notice by Bank to or demand by Bank of Borrower, Borrower's
 Liabilities shall be due and payable, forthwith. 
 
	7.4  Any notice required to be given by Bank to Borrower deposited in the
 United States mail, postage prepaid shall be delivered by registered or
 certified mail to the address specified at the beginning of this Agreement
 not less than ten (10) days prior to such proposed action, shall constitute
 commercially reasonable and fair notice to Borrower thereof. 
 
	7.5  Under an event of default Borrower waives and releases any cause of
 action and claim against Bank's possession or collection of the monies,
 reserves, deposits, deposit accounts and interest or dividends thereof,
 cash or cash equivalents, collectively the "Monies", in conjunction with this
 Loan Agreement, absent gross negligence or willful misconduct. 
 
 
	8.  GENERAL 
 
	8.1  Borrower covenants, warrants and represents to Bank that all
 representations and warranties of Borrower contained in this Agreement and
 the Other Agreements shall be true from time of Borrower's execution of this
 Agreement to the end of the original term and each renewal term hereof.
 All of Borrower's warranties, representations, undertakings, and covenants
 contained in this Agreement or the Other Agreements shall survive the
 termination or cancellation of the same, until payment of all of Borrower's
 Liabilities. 
 
	8.2  The terms and provisions of this Agreement and the Other Agreements
 shall supersede any prior agreement or understanding of the parties hereto,
 and contain the entire agreement of the parties hereto with respect to the
 matter covered hereby.  This Agreement and the Other Agreements may not be
 modified, altered, or amended except by an agreement in writing signed by
 Borrower and Bank.  Except for the provisions of Section 2 hereof, this
 Agreement shall continue to full force and effect so long as any portion or
 component of Borrower's Liabilities shall be outstanding.  Should a claim
 ("Recovery Claim") be made upon the Bank at any time for recovery of any
 amount received by the Bank in payment of Borrower's Liabilities (whether
 received from Borrower or otherwise) and should the Bank repay all or part
 of said amount by reason of (1) any judgment, decree or order of any court
 or administrative body having jurisdiction over Bank or any of its property;
 or (2) any settlement or compromise of any such Recovery Claim effected by
 the Bank with the claimant (including Borrower), this Agreement shall
 continue in effect with respect to the amount so repaid to the same extent
 as if such amount had never originally been received by the Bank,
 notwithstanding any prior termination of this Agreement, the return of this
 Agreement to Borrower, or the cancellation of any note or other instrument
 evidencing Borrower's Liabilities.  Borrower may not sell, assign or transfer
 this Agreement, or the Other Agreements or any portion thereof. 
 
	8.3  Bank's failure to require strict performance by Borrower of any
 provision of this Agreement shall not waive, affect or diminish any right of
 Bank thereafter to demand strict Default by Borrower under this Agreement or
 the Other Agreements, whether the same is prior or subsequent thereto and
 whether of the same or of a different type.  None of the undertakings, or the
 Other Agreements and no Event of Default by Borrower under this Agreement or
 the Other Agreements shall be deemed to have been suspended or waived by Bank
 unless such suspension or waiver is by an instrument in writing signed by an
 officer of Bank and directed to Borrower specifying such suspension or waiver.
 
 	8.4  If any provision of this Agreement or the Other Agreements or the
 application thereof to any Person or circumstance is held invalid or
 unenforceable, the remainder of this Agreement and the Other Agreements and
 the application of such provision to other Persons or circumstances will not
 be affected thereby and the provisions of this Agreement and the Other
 Agreements shall be severable in any such instance. 
 
	8.5  This Agreement and the Other Agreements shall be binding upon and
 inure to the benefit of the successors and assigns of Borrower and Bank.
 This provision, however, shall not be deemed to modify Paragraph 8.2 hereof. 
 
	8.6  Borrower hereby appoints Bank as Borrower's agent and attorney-in-fact
 for the purpose of carrying out the provisions of this Agreement in the event
 of Bank's commitment to Borrower is outstanding and taking any action and
 executing any agreement, instrument or document which Bank may deem necessary
 or advisable to accomplish the purposes hereof which appointment is
 irrevocable and coupled with an interest.  All monies paid for the purposes
 herein, and all costs, fees and expenses paid or incurred in connection
 therewith, shall be part of Borrower's Liabilities, payable by Borrower to
 Bank on demand. 
 
	8.7  Except as otherwise provided in the Other Agreements, if any provision
 contained in this Agreement is in conflict with, or inconsistent with any
 provision in the Other Agreements, the provision contained in this Agreement
 shall govern and control. 
 
	8.8  Except as otherwise specifically provided in this Agreement, Borrower
 waives any and all notice or demand which Borrower might be entitled to
 receive by virtue of any applicable statute of law, and waives presentment,
 demand and protest and notice of presentment, protest, default, dishonor,
 non-payment, maturity, release, compromise, settlement, extension or renewal
 of any and all agreements, instruments or documents at any time held by Bank
 on which Borrower may in any way be liable. 
 
	8.9  Until Bank is notified by Borrower to the contrary in writing by
 registered or certified mail directed to Bank's principal place of business,
 the signature upon this Agreement or upon any of the Other Agreements or any
 partner, manager, employee or agent of the Borrower, or of any other Person
 designated in writing to Bank by any of the foregoing, shall bind Borrower
 and be deemed to be the duly authorized act of Borrower. 
 
	8.10  This Agreement and the Other Agreements shall be governed and
 controlled by the laws of the State of Illinois. 
 
	8.11  After an Event of Default, if at anytime or time hereafter whether or
 not Borrower's Liabilities are outstanding at such time, Bank:  (a) employs
 counsel for advice or other representation (i) with respect to this
 Agreement, the Other Agreements or the administration of Borrower's
 Liabilities, (ii) to represent Bank in any litigation, arbitration contest,
 dispute, suit or proceeding or to commence, defend or intervene or to take
 any other action in or with respect to any litigation, arbitration, contest,
 dispute, suit or proceeding or to commence, defend or intervene or to take
 any other action in or with respect to any litigation, arbitration, contest,
 dispute, suit or proceeding (whether instituted by Bank, Borrower or any
 other Person) in any way or respect relating to this Agreement, the Other
 Agreements, or Borrower's affairs, or (iii) to enforce any rights of Bank
 against Borrower or any other Person which may be obligated to Bank by virtue
 of this Agreement or the other Agreements, including, without limitation, any
 Obligor attempts to or enforces any of Bank's rights or remedies under this
 Agreement or the Other Agreements, including the reasonable costs and
 expenses incurred by Bank in any manner or way with respect to the foregoing,
 shall be part of Borrower's Liabilities, payable by Borrower to Bank on
 demand. 
 
	8.12  BORROWER IRREVOCABLY AGREES THAT , SUBJECT TO BANK'S SOLE AND ABSOLUTE
 ELECTION, ALL ACTIONS OR PROCEEDINGS IN ANY WAY, MANNER OR RESPECT, ARISING
 OUT OF OR FROM OR RELATED TO THIS AGREEMENT, THE OTHER AGREEMENTS SHALL BE
 LITIGATED ONLY IN COURTS HAVING SITUS WITHIN THE CITY OF CHICAGO, STATE OF
 ILLINOIS.  BORROWER HEREBY CONSENTS AND SUBMITS TO THE JURISDICTION OF ANY
 LOCAL, STATE OR FEDERAL COURT LOCATED WITHIN SAID CITY AND STATE.  BORROWER
 HEREBY WAIVES ANY RIGHT IT MAY HAVE TO TRANSFER OR CHANGE THE VENUE OF ANY
 LITIGATION BROUGHT AGAINST BORROWER BY BANK IN ACCORDANCE WITH THIS
 PARAGRAPH.
 
 
	8.13  BORROWER HEREBY IRREVOCABLY WAIVES ANY RIGHT TO TRIAL BY JURY IN ANY
 ACTION, SUIT, COUNTERCLAIM OR PROCEEDING (I) TO ENFORCE OR DEFEND ANY RIGHTS
 UNDER OR IN CONNECTION WITH THIS AGREEMENT, THE OTHER AGREEMENTS, OR ANY
 AMENDMENT, INSTRUMENT, DOCUMENT OR AGREEMENT DELIVERED OR WHICH MAY IN THE
 FUTURE BE DELIVERED IN CONNECTION HEREWITH OR THEREWITH, OR (II) ARISING
 FROM ANY DISPUTE OR CONTROVERSY ARISING IN CONNECTION WITH OR RELATED TO THIS
 AGREEMENT, THE OTHER AGREEMENTS, OR ANY SUCH AMENDMENT, INSTRUMENT, DOCUMENT
 OR AGREEMENT, AND AGREES THAT ANY SUCH ACTION, SUIT, COUNTERCLAIM OR
 PROCEEDING SHALL BE TRIED BEFORE A COURT AND NOT BEFORE A JURY.   
 
 
 IN WITNESS WHEREOF, this Agreement has been duly executed as of the day and
 year specified at the beginning hereof. 
 
						
CORCOM, INC.

By:  s/s Thomas J. Buns        
						 
Its:  Vice President Finance    


ATTEST: 

By:  s/s Walter Roth           

Its:  Secretary                 
 
 
 
 Accepted this 28th day of March, 1995, at Bank's principal place of business
 in the City of Chicago, State of Illinois. 
 
 
						
AMERICAN NATIONAL BANK AND 
TRUST COMPANY OF CHICAGO 
 
 
By: s/s Todd B. Younger       
 
Its:  Officer                         
 
	        AMERICAN NATIONAL BANK AND TRUST COMPANY OF CHICAGO 
	                    REVOLVING LINE OF CREDIT 
	                              NOTE 
 
 
 
$4,000,000.00	                            Date:     March 28, 1995 
Chicago, Illinois	                         Due:  December 31, 1995 
 
 
 
	FOR VALUE RECEIVED, the undersigned, (jointly and severally if more than
 one) ("Borrower"), promises to pay to the order of American National Bank
 and Trust Company of Chicago ("Bank"), at its principal place of business
 in Chicago, Illinois or such other place as Bank may designate from time to
 time hereafter, the principal sum of Four Million and No/100 Dollars
 ($4,000,000.00) or such lesser principal sum as may be owed by Borrower to
 Bank hereunder, such payment to occur on December 31, 1995.  Borrower's
 obligations under this Note shall be defined and referred to herein as
 "Borrower's Liabilities." 
 
	Borrower may prepay all or part of the principal, together with accrued
 interest on the amount so prepaid, without penalty during the term of the
 Note.  All prepayments shall be applied upon installments of the most remote
 maturity.  
 
	The principal amount of this Note is available to the Borrower on a revolving
 basis.  The undersigned may borrower, repay and reborrow any amount, subject
 to the limitations contained in the Loan Agreement of even date herewith
 executed by and between Corcom, Inc. and Bank (the "Loan Agreement"),
 provided that the total outstanding principal balance does not exceed the
 principal amount of this Note and that Borrower has complied with all the
 terms of this Note and the Loan Agreement.  The books and records of the Bank
 shall be determinative of the unpaid balance of this Note from time to time
 outstanding, absent manifest error.  
 
	Reference is hereby made to the Loan Agreement for a statement of the terms
 and conditions under which the loan evidenced hereby has been made, is to be
 repaid and for a statement of Bank's remedies upon the occurrence of an
 "Event of Default" as defined in the Loan Agreement.  The terms and
 conditions of the Loan Agreement are incorporated herein by reference in
 their entirety.  
 
	Borrower's Liabilities unpaid from time to time shall bear interest
 (computed on the basis of a 360-day year and actual days elapsed) from the
 date hereof until paid at a per annum rate at all times equal to the Bank's
 Base Rate or equivalent as announced or published publicly from time to time
 (the "Base Rate").  Therefore, interest shall be calculated for each day at
 1/360th of the applicable per annum rate.  The Base Rate is not indicative of
 the lowest or best rate offered by the Bank to any customer or group of
 customers.  A change in the Base Rate shall constitute a corresponding change
 in the interest rate hereunder effective on and as of the date of such change
 in the Base Rate.  The above notwithstanding, Borrower may elect to and cause
 all or a portion of the principal outstanding on this Note to bear interest
 at a daily rate equal to one and one-half percent (1 1/2) in excess of the
 London Interbank Offered Rate ("LIBOR") as announced by Bank from time to
 time pursuant to the terms and conditions of that certain London Interbank
 Offered Rate Borrowing Agreement between Borrower and Bank of even date
 herewith.  Interest accruing prior to maturity shall be payable by Borrower
 to Bank monthly, or as billed by Bank to Borrower, at Bank's principal place
 of business, or at such other place as Bank may designate from time to time
 hereafter.  All unpaid interest at maturity shall be paid with the principal
 amount of Borrower's Liabilities due hereunder.   
 
	Upon the occurrence of an Event of Default, as hereinafter defined, interest
 on the unpaid principal balance shall accrue at a rate equal to the then
 existing Base Rate plus three percent (3%) per annum.  
 
	Borrower agrees that in any action or proceeding instituted to collect or
 enforce collection of this Note, the amount recorded on the books and records
 of the Bank shall be prima facie evidence of the unpaid principal balance of
 this Note; provided that the failure of the Bank to record any advance
 hereunder shall not limit or otherwise affect the obligation of the Company
 to repay the principal amount owing on this Note together with accrued
 interest thereon.  
 
	If any payment becomes due and payable on a Saturday, Sunday or legal holiday
 under the laws of the State of Illinois, the due date of such payment shall
 be extended to the next business day.  If the date for any payment of
 principal is thereby extended or is extended by operation of law or
 otherwise,interest thereon shall be payable at the then applicable rate of
 interest for such extended time.  
 
	Borrower warrants and represents to Bank that Borrower shall use the proceeds
 represented by this Note solely for the proper business purposes, and
 consistently with all applicable laws and statutes.  
 
	All of Bank's rights and remedies under this Note are cumulative and
 non-exclusive.  The acceptance by Bank of any partial payment made hereunder
 after the time when any of Borrower's Liabilities become due and payable will
 not establish a custom, or waive any rights of Bank to enforce prompt payment
 thereof.  Bank's failure to require strict performance by Borrower of any
 provision of this Note shall not waive, affect or diminish any right of Bank
 thereafter to demand strict compliance and performance therewith.  Any waiver
 of an Event of Default hereunder shall not suspend, waive or affect any other
 Event of Default hereunder.  Borrower and every endorser waive presentment,
 demand and protest and notice of presentment, protest, default, non-payment,
 maturity, release, compromise, settlement, extension or renewal of this Note,
 and hereby ratify and confirm whatever Bank may do in this regard.  Borrower
 further waives any and all notice or demand to which Bank might to entitled
 with respect to this Note by virtue of any applicable statute or law (to the
 extent permitted by law).  
 
	Borrower agrees to pay, upon Bank's demand therefore, any and all reasonable
 costs, fees and expenses (including attorneys' fees, costs and expenses)
 incurred in enforcing any of Bank's rights hereunder, and to the extent not
 paid the same shall become part of Borrower's Liabilities hereunder.  
 
	If any provision of this Note or the application thereof to any party or
 circumstance is held invalid or unenforceable, the remainder of this Note and
 the application thereof to other parties or circumstances will not be
 affected thereby, the provisions of this Note being severable in any such
 instance.  
 
	This Note is submitted by Borrower to Bank at Bank's principal place of
 business and shall be deemed to have been made there at.  This Note shall be
 governed and controlled by the laws of the State of Illinois as to
 interpretation, validity, construction, affect, choice of law and in all
 other respects.  
 
	No modification, waiver, estoppel, amendment, discharge or change of this
 Note or any related instrument shall be valid unless the same is in writing
 and signed by the party against which the enforcement of such modification,
 waiver, estoppel, amendment, discharge or change is sought. 
 
	TO INDUCE BANK TO ACCEPT THIS NOTE, BORROWER IRREVOCABLY AGREES THAT, SUBJECT
 TO BANK'S SOLE AND ABSOLUTE ELECTION, ALL ACTIONS OR PROCEEDINGS IN ANY WAY,
 MANNER OR RESPECT, ARISING OUT OF OR FROM OR RELATED TO THIS NOTE SHALL BE
 LITIGATED IN COURTS HAVING SITUS WITHIN THE CITY OF CHICAGO, STATE OF
 ILLINOIS.  BORROWER HEREBY CONSENTS TOT HE JURISDICTION OF ANY LOCAL, STATE
 OR FEDERAL COURT LOCATED WITHIN SAID CITY AND STATE AND WAIVES ANY OBJECTION
 IT MAY HAVE BASED ON IMPROPER VENUE OR FORUM NON CONVENIENS TO THE CONDUCT OF
 ANY PROCEEDING INSTITUTED HEREUNDER. 
 
	BORROWER AND BANK IRREVOCABLY WAIVE ANY RIGHT TO TRIAL BY JURY IN ANY ACTION
 OR PROCEEDING (I) TO ENFORCE OR DEFEND ANY RIGHTS UNDER OR IN CONNECTION WITH
 THIS NOTE OR ANY AMENDMENT, INSTRUMENT, DOCUMENT OR AGREEMENT DELIVERED OR
 WHICH MAY IN THE FUTURE BE DELIVERED IN CONNECTION HEREWITH OR (II) ARISING
 FROM ANY DISPUTE OR CONTROVERSY IN CONNECTION WITH OR RELATED TO THIS NOTE OR
 ANY SUCH AMENDMENT, INSTRUMENT, DOCUMENT OR AGREEMENT, AND AGREE THAT ANY
 SUCH ACTION NOR PROCEEDING SHALL BE TRIED BEFORE A COURT AND NOT BEFORE A
 JURY. 
 
 
 
	BORROWER: 
 
	CORCOM, INC. 
 
 
	By:  s/s  Thomas J. Buns 
	Its:  Vice President Finance 
 
	Attested: 
 
	By:  s/s Walter Roth 
	Its:  Secretary