Outdoor telecommunications cabinet for connecting an external communication network to a user network, made of a single piece case comprising: - a first area associated with a first closure door, housing: • a plurality of optic adapters having opposite first and second sides; • a corresponding plurality of connecting optical fibres for connection to optical fibres of the user network, the connecting optical fibres having opposite free ends and terminated ends, terminated with respective optical fibre connectors that are respectively engaged with the first sides of the adapters, characterized in further comprising: • a corresponding plurality of optical fibre patch cords having opposite first and second ends terminated with respective optical fibre connectors, the optical fibre connectors terminating the first ends being respectively engaged with the second sides of the adapters; and - a second area associated with a second closure door, housing: • a connector holder having a plurality of seats adapted to temporaly hold the optical fibre connectors terminating the second ends of the patch cords, • a space adapted to house, after installation on site of the cabinet, fibre optic cabling and accessories for connection to the external communication network, • the connector holder acting as a temporary parking area for the optical fibre connectors terminating the second ends of the patch cords, waiting to be connected to said optical fibre cabling and/or accessories for connection to the external communication network. - a first area associated with a first closure door, housing: • a plurality of optic adapters having opposite first and second sides; • a corresponding plurality of connecting optical fibres for connection to optical fibres of the user network, the connecting optical fibres having opposite free ends and terminated ends, terminated with respective optical fibre connectors that are respectively engaged with the first sides of the adapters, • a plurality of optic adapters having opposite first and second sides; • a corresponding plurality of connecting optical fibres for connection to optical fibres of the user network, the connecting optical fibres having opposite free ends and terminated ends, terminated with respective optical fibre connectors that are respectively engaged with the first sides of the adapters, • a corresponding plurality of optical fibre patch cords having opposite first and second ends terminated with respective optical fibre connectors, the optical fibre connectors terminating the first ends being respectively engaged with the second sides of the adapters; and - a second area associated with a second closure door, housing: • a connector holder having a plurality of seats adapted to temporaly hold the optical fibre connectors terminating the second ends of the patch cords, • a space adapted to house, after installation on site of the cabinet, fibre optic cabling and accessories for connection to the external communication network, • the connector holder acting as a temporary parking area for the optical fibre connectors terminating the second ends of the patch cords, waiting to be connected to said optical fibre cabling and/or accessories for connection to the external communication network. • a connector holder having a plurality of seats adapted to temporaly hold the optical fibre connectors terminating the second ends of the patch cords, • a space adapted to house, after installation on site of the cabinet, fibre optic cabling and accessories for connection to the external communication network, • the connector holder acting as a temporary parking area for the optical fibre connectors terminating the second ends of the patch cords, waiting to be connected to said optical fibre cabling and/or accessories for connection to the external communication network.