2002 - cesnet
2002 - cesnet 2002 - cesnet
During the second half of the year, we tested the Cisco and Pandatel DWDMsystems on the Brno–Olomouc line. The optical fibres on this line are approximately115 km long. At this distance, the impact of chromatic dispersionof the optical fibres does not fully develop, particularly thanks to the appliedtransmission technologies. However, this distance is already beyond reach ofstandard SWDM devices and an optical amplifier must be used.At first, we tested the Cisco 15540 system, with Cisco 15501 optical amplifiers, aswell as with Keopsys optical amplifiers. There were four neighbouring channelsavailable with transponders configurable from Fast Ethernet, through SDH STM-1, STM-4 to STM-16 and Gigabit Ethernet.Cisco ONS 15540EDFAboosterfiber 130 kmEDFAboosterFigure 4.13: Testing configuration – Cisco 15540Cisco ONS 15540We made use of one STM-16 channel for common traffic, one Gigabit Ethernetchannel, which we tested using Schomiti analyzer, and two STM-1 channels forthe testing of bit error rate, using HP 37717 analyzer. The configuration of thisdevice is very user-friendly as it includes the standard Cisco IOS.In the same way, we carried out the testing of the Cisco 15200 system, which issmaller device (available for a reasonable price). We had one Cisco 15252 modularmultiplex at our disposal, together with three single-channel Cisco 15201multiplexes. This solution proved to be fully functional as well. It is convenient,particularly, for channel branching within the course of a line. An advantageof this device is that in the case of any power supply failure, transit channelsremain fully operational. The system configuration is not as user-friendly as inCisco 15540.During the testing of a Pandatel Fomux 3000 DWDM system we used the Keopsysamplifiers, as the manufacturer offers no optical amplifiers. In this case, itwas possible to make a successful use of amplifiers intended for the amplificationof a single channel. However, there were some problems concerning theoutput power regulation of individual cards (SDH and Gigabit Ethernet), whichis why the deployment of this system in the network does not appear to be aperspective option.Another objective was to find out whether it is possible to make use of Keopsysoptical amplifiers intended for single-channel transmissions, together with theDWDM system, with a relatively low number of channels (4 to 8). The resultsconfirmed our expectations and the line was running without any complications,using both types of amplifiers. We may therefore say that the tested sys-60 High-speed National Research Network and its New Applications 2002
Cisco ONS 15201boosterfiber 130 kmCisco ONS 15252EDFACisco ONS 15201EDFAboosterFigure 4.14: Testing configuration – Cisco 15200Cisco ONS 15201tem can be used in operational environment and we also checked the interoperabilityof the tested products.We also measured the spectral characteristics for all the tested systems. SeeFigure 4.15 for the generation of a four-wave mixing and own phase modulation,caused by the high power level inserted into the fibre. In this case, no informationcould be transferred (distortion is too high).Figure 4.15: Spectral characteristics of Cisco 15540, with input power of30 dBm, input of the receiver4.7.3 Components for Switching on Optical LayerThe last area is associated with optical switching. Considering the fact that thistype of a device is very costly and it is not generally available, the work hasbeen carried out so far at the theoretical level (information search, computersimulations).We presented the issues of optical switches and optical networks during aworkshop of the optical research group. In April, we participated in the ICTONconference with a speech on the issue of optical switching. We arranged a shorttermand long-term lease of a selected optical line for our testing with SloaneHigh-speed National Research Network and its New Applications 200261
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- Page 11 and 12: 2 Brief SummaryThe research plan ti
- Page 13 and 14: men. We designed the basic concept
- Page 15 and 16: 2.4 Other ProjectsThe objective of
- Page 17 and 18: 3 Operation of CESNET2During 2002,
- Page 19 and 20: Canarie622 MbpsESNET622 MbpsGÉANT/
- Page 21 and 22: central network core routers with t
- Page 23 and 24: The existing logical topology of mu
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- Page 27 and 28: Within the informative part, we req
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- Page 39 and 40: 4 Optical Networks and theirDevelop
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- Page 45 and 46: 4.2.2 User InterfaceSubscribers (me
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- Page 51 and 52: It is also possible to implement th
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- Page 67 and 68: Missing in this list are especially
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- Page 83 and 84: scaling is considerably restricted;
- Page 85 and 86: Figure 6.1: Modified program for sh
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- Page 89 and 90: programs which control the integrat
- Page 91 and 92: Figure 6.4: Example of broadcast fr
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Cisco ONS 15201boosterfiber 130 kmCisco ONS 15252EDFACisco ONS 15201EDFAboosterFigure 4.14: Testing configuration – Cisco 15200Cisco ONS 15201tem can be used in operational environment and we also checked the interoperabilityof the tested products.We also measured the spectral characteristics for all the tested systems. SeeFigure 4.15 for the generation of a four-wave mixing and own phase modulation,caused by the high power level inserted into the fibre. In this case, no informationcould be transferred (distortion is too high).Figure 4.15: Spectral characteristics of Cisco 15540, with input power of30 dBm, input of the receiver4.7.3 Components for Switching on Optical LayerThe last area is associated with optical switching. Considering the fact that thistype of a device is very costly and it is not generally available, the work hasbeen carried out so far at the theoretical level (information search, computersimulations).We presented the issues of optical switches and optical networks during aworkshop of the optical research group. In April, we participated in the ICTONconference with a speech on the issue of optical switching. We arranged a shorttermand long-term lease of a selected optical line for our testing with SloaneHigh-speed National Research Network and its New Applications <strong>2002</strong>61
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