2002 - cesnet

Chemical Technology and PASNET, we are preparing a single-fibre circuit ICTDejvice–Jižní město. The savings of one fibre usually reaches from CZK 0.50 toCZK 5 per metre and month, depending on the locality and the provider. Theproject researchers are most likely to reach the leading position in the use ofsingle-fibre long-distance lines in NREN (we have not been informed about anyother operated single-fibre NREN line).Next year, we would like to test other converters for single-fibre lines, i.e., convertersproduced by NBase-Xyplex, EM 316WFC/S3 & EM 316WFT/S3 with areach of 20–50 km, EM 316WFC/S4 & EM 316WFT/S4 and EM 316WFC/S5 & EM316WFT/S5 with a reach of up to 125 km.Another result of the work described above was the successful deployment ofconverters with a reach of 2 km within a multimode fibre from the headquartersof CESNET to the Faculty of Civil Engineering, Czech Technical University (tomicrowave antennas).CISCO 7609CISCO 3548 Xyplex EM316/MX Xyplex EM316/MX CISCO 3524GE MM 850 nmGE MM 850 nmExtGE MM 1310 nmExtGE MM 850 nmFE UTPFigure 4.7: Extension of GE reach on MM fibre4.6 Microwave NetworksBased on the selection procedures for the installation of lines in cities, whereit was necessary to increase the bandwidth from the existing 2 × 2 Mbps to34 Mbps, we selected the ALGON microwave devices and established Ostrava–Opava,Ostrava–Karviná and Ústí n. L.–Děčín lines, with the interfaceEthernet/Fast Ethernet + E1 in sideband (overall, it is possible to make use of36 Mbps) and combined optical/microwave 34 Mbps lines to Jindřichův Hradecand Cheb. Another microwave circuit of 34 Mbps in Vyškov has faced difficultiesin the licensing procedure.Microwave circuits of 155 Mbps or a parallel group of such circuits with GEinterface can be deployed within approximately 2–3 months, if necessary. Takinginto account results in the lease and usage of fibres, and the sensitivity toatmospheric disturbances, additional microwave lines will be deployed onlywhere necessary (e.g., 10 Mbps circuits on customer’s request or for price reasons).Wherever fibres are successfully deployed (e.g., in Opava), it is possibleto keep the original microwave circuit as a backup or reinstall it elsewhere.During the year, we investigated potential suppliers of microwave devices operatingat 155 Mbps. We identified the following potential suppliers and devices:High-speed National Research Network and its New Applications 200253