# Connecting to an E1 network

Caution: | Dialogic obtains board-level approvals certificates for supported countries. Some countries require that you obtain system-level approvals before connecting to the public network. To learn what approvals you require, contact the appropriate regulatory authority in the target country.

The CG 6565E board has up to eight CEPT E1 interfaces depending on the board variant. For typical E1 communications, each E1 interface connects directly to an E1 trunk, as shown in the following illustration:

Trunks synchronize when the OAM API boots the board.

In EU countries, you can connect the board to either an Integrated Services Digital Network (ISDN) Primary Rate Interface (PRI) or a 2048 kbit/s digital structured or unstructured leased line.