A  Complex hardware product  or  System  shall be assembled, installed, and brought into  service no later than fifteen (15)  Normal working days  after the date of notification by the  contracting authority of its removal to the installation site unless another time limit is laid  down in the specific contract.  Upon successful installation, the contr actor shall notify the contr acting author ity by a  Means of communication  of the date on which the  Complex hardware product  or  System  has been brought into service, which date will be the  Commissioning date  for this  particular  Product  or  System .  The acceptance period will run up to seventy-five (75)  Normal working days  from the  Commissioning date .  During this acceptance period, t h e c o n t r a c t i n g a u t h o r i t y shall notify any defaults in  the  Complex hardware product  or  System  to the contractor by a  Means of communication .  As from the date of such notification, the running of the acceptance period will be  suspended up to the date on which the contractor notifies by a  Means of communication  that  it has remedied the notified default, this date will reinitiate the acceptance period for the  rest of the seventy-five (75)  Normal working days  period, with a guaranteed minimum period  of twenty-five (25)  Normal working days  after the last notification by the contractor that it has  remedied a default.  Upon the expiry of the acceptance period, acceptance of a  Product  will be recorded in a  Certificate of Conformity that shall indicate inter alia the detailed nature of the accepted  Complex hardware products  and the reference number of this framework contract and of the  specific contract concerned.  If no  Certificate of Conformity  has been issued at the end of the acceptance period and if no  notification of faulty operation is pending, the contracting authority is considered as having  accepted the  Complex hardware product. If, due to faulty operation by the contractor, acceptance cannot be completed within a  maximal time limit of hundred and fifty (150) calendar days from the  Commissioning date ,  unless a different time limit has been specified by specific contract, the contracting authority  shall be entitled to terminate the specific contract after giving the contractor a thirty (30)  calendar days' notice by a  Means of communication  to meet its obligations. This provision is  without prejudice to the contracting authority’s other rights under Article I.13 of the General  Conditions.  The contractor shall guarantee all goods delivered in conformity with Article I.1 of the  General Conditions. During the two years guarantee period stated in Article I.1 of the  General Conditions the contractor shall provide  maintenance  at its own and sole expense.  The guarantee period shall be automatically extended by the total duration of stoppages  attributable to the contractor during that period, as recorded under the maintenance  procedures. For this purpose only stoppages lasting eight (8) consecutive  Normal working  hours  or more shall be counted. One day's extension therefore corresponds to a stoppage  Page 19 of 40  IV.3.4.  Guarantee specifications for  Complex hardware products IV.3.3.3.  Termination  IV.3.3.2.  The acceptance period 