The Crocus FO 45M is a high-speed modem designed for connecting end-user equipment using optical fibre.

Thanks to the field-exchangeable fibre modules, the Crocus FO45M can be used for almost any type of fibre medium, ranging from short-haul multi-mode fibre, to the long-haul single-mode fibre connection. When using a long-haul module, distances of over 70 km can easily be covered.

The Crocus FO45M allows the user to connect at speeds up to 45 Mbps, and can be terminated on almost any type of data interface. Not only traditional serial interfaces like V.35, V.36, RS-530 and X.21 , but also G.703 E1 (transparent 2Mbps or with G.704 framing), G.703 E3 (34 Mbps), G.703 T3 (45 Mbps) , HSSI (High Speed Serial Interface) and direct Ethernet 10/100Base-T connections with integrated bridge or router functionality are available. It is possible to combine different types of interfaces on the two sides of the communication link, eliminating the need for external interface conversion. All these interface boards can be exchanged in only a few seconds, so flexibility is maximised. The actual speed of the connection can be configured in multiples of 64 kbps (up to 2Mbps), in multiples of 2 Mbps (up to 10 Mbps), or for 34 and 45 Mbps. This makes the equipment well suited for offering multiple user-speeds in carrier access environments.

For critical connections, it is possible to create 100% redundancy on the optical link by inserting a second optical interface into the Crocus FO45M. This creates a complete 1-to-1 backup of the physical connection.

For large concentration sites, rackmount versions are mounted in a CN4 cardnest and can offer densities of up to 30 modems per nest. Both 230/115 Vac and direct 24/48 Vdc powering can be used.

The unit is designed for integration into demanding network environments and can be controlled by the complete set of network maintenance and management tools as they are described in this catalogue.