before the start of the course programme. In the event of the course being cancelled or postponed, the operator has to provide about 30 days notice to the vendor's training centre. If the notice period is crossed cancellation can lead to invoicing the full course fees to the operator plus possible expenses incurred for arranging the course. A standard course day is 7 to 8 hours as given in the course instructor's plan, including an hour for a lunch break and appropriate tea/coffee breaks in the morning and afternoon. The vendor's training department arranges all the necessary training documentation and training environment. Training documentation and updates are generally in English unless translated and customised in other languages as per the customer's needs. A.4.3 Other Optional O&M Assistance Services The vendor provides O&M assistance services in order to assist, support and consult the operator in the regular operation and maintenance of the equipment. They can be long term or short term. Various kinds of assistance services are available to the operator as given below. HW Expansions Hardware expansions are recommended when the existing hardware capacity becomes staurated. Expan- sions can be simple processes involving the addition of extra plug-in units or memory additions without any major changes in the software. Alternatively, they can be major activities involving the addition of whole racks and subracks. Such activities are always tried in the vendor's testing laboratories or in the operator's test network, and only after running all stability and verification tests are they implemented in a live network. These activities can be free from the vendor's side due to limitations of existing hardware or they can be charged as a totally separate sale, having their own separate or combined warranty, after sales support and maintenance clauses. These activities are only done by the vendor's technical team or under their guided supervision, as it involves equipment installed in a live network with existing su