Division 6 For trans-European systems with a deployment window but without a single implementation date, the Member States may, where deemed appropriate, start the deployment at an appropriate date within this window and may allow a period of time within which economic operators can migrate. The start and end dates shall be communicated to the Commission. The common domain aspects will need to be carefully considered by the Commission and the Member States.

The following trans-European systems are covered by the first paragraph:

1. (a)

   UCC NCTS upgrade (point 9 of Part II);

2. (b)

   UCC AES (Component 1) (point 10 of Part II).

3. (c)

   UCC CCI (point 15 of Part II)

The trans-European UCC ICS2 (point 17 of Part II) also requires gradual implementation and transition. The approach in this case is different, however, since all Member States are expected to be ready at the same time for each release at the start of each deployment window. Moreover, where deemed appropriate, Member States may allow the economic operators to gradually connect to the system until the end of the deployment window provided for each of the releases. Member States must publish, in coordination with the Commission, the deadlines and instructions for economic operators on their website.