Notification of the types of interfaces

The obligation to notify the types of interfaces of public communication networks

In accordance with Section 73(7) and (8) of Electronic Communications Act, an undertaking providing a public communication network is obliged to publish, in a manner allowing for remote access, and to notify to CTU the types of interfaces which it offers for connecting devices and their technical specifications. These specifications shall be sufficiently detailed to allow the design of devices capable of using all publicly available electronic communications services provided through the relevant interfaces. The technical specifications must contain all the information necessary to enable producers to carry out the appropriate tests with regard to the technical requirements applicable to the devices.

This obligation must be met not later than one month before the public telecommunication services provided via these types of interface are available. An undertaking providing a public communication network is obliged to report any changes to technical specifications to CTU and to publish these in a manner allowing for remote access not later than 3 months prior to the date on which they are to be made.

Failure to comply with these obligations is an administrative offence under Section 118(13)(c) of the Act, for which a fine may be imposed under Section 118(23)(c) of the Act of up to CZK 50,000,000 or up to 10% of the net turnover of the offender for the last completed accounting period, whichever is higher.

The way in which information about types of interface must be provided and a list of specifications are described in the following guidelines.

CTU publishes information about links to individual types of interface in the Czech Republic, doing so in accordance with Article 4 of Directive 1999/5/EC:

1) Radio interfaces (Article 4.1 of Directive 1999/5/EC)

Information about permitted frequency bands in the Czech Republic – see:

Interface and its technical specifications

2) Types of interfaces in electronic communication networks for connecting telecommunication terminal equipment (Article 4.2 of Directive 1999/5/EC)

A list of types of interfaces and their technical specifications for connecting devices notified according to Section 73(7) of Act No. 127/2005 Coll. on electronic communications – see: