Combines both worlds – IP digital and analogue
The roots of the CFO family are in the global appearance of a fibre optic CCTV system in early 1990s. The CFO success story has gone through several decades, and the video platform has now reached the 5th design generation by bringing IP Ethernet connectivity next to analogue interfaces. This enables a seamless hybrid operation on remote sites where the camera technology is due to be updated from analogue operation to digital IP. The latest video modem designs also have the benefit of using optical industry standard SFP transceivers to meet various fibre cable network arrangements.
The latest 6th-generation CFO has also already been born; however these products are without video as such. New media converters provide pure IP connectivity over fibre optics in the same easy fashion and installation-friendly manner as the whole CFO family. In this series, the future holds some new interesting product functionalities to come.
Perfect fit for Dark Fibre
Almost any unused optical fibre, a.k.a. dark fibre, is easily adaptable for video transmission purposes. Furthermore the transmission system can fully utilise the whole bandwidth of the optical cable to carry uncompressed video signals. The CFO platform uses digital processing, which provides an excellent signal quality for composite PAL & NTSC signals. As there are no complicated algorithms applied, the operation is indeed fully real-time. Furthermore the fibre optic media is immune to EMI and does not provide any interference to other nearby signal cables.
Great video capacity
In a typical video link arrangement, the system can carry a maximum of 4 or 8 analogue video channels over a pair of video modems. The available optical link budget for standard CFO links is typically 20 dB in a single mode fibre (corresponds to 40–50 km). On CFO models utilising long range SFP transceivers, the achieved transmission distance can be even longer.
When the number of available fibres is limited, the video channel capacity can be still be kept high and even increased by optical multiplexing. This means that several video modems with individual optical wavelengths can be multiplexed to the same fibre without risk of co-channel interference. A CFO system using CWDM-based ITU standard compliant optics can support a maximum of 72 simultaneous video channels over a single mode fibre core.
From single video links to multiple channel systems
The CFO product family fibre optic modems are available in various form factors and different functionalities. The simplest CFO system is a single-channel video-only link with a miniature standalone transmitter. The most complex point-to-point design is a rack module type transmitter and a receiver pair supporting eight standard-definition video channels together with a number of EIA RS data and stereo audio channels plus a 10/100 Mbps Ethernet bridge. Typically the CFO variants can be classified either as 1, 4 or 8 video channel modems with or without additional data/audio channels. Digitally processed transmission with a fixed transmission rate guarantees for each transmitted payload the maximum capacity regardless of the actual use of each channel. The basic video devices are unmanaged, and some minimal configurations can be done by a few device-specific DIP switches. Some more advanced CFO video modems are managed with SNMP connectivity and can also be remotely configured over a HyperTerminal or telnet connection.
The CFO family is based on a low-energy design. All rack-card combinations are possible in a 3RU 19” installation rack. Redundant powering is an option. Units have passive cooling and can typically meet -34 to +74 °C operation temperature.