October 10 th 2004ANW Moldova NREN on dark fibre with CWDM - experience of S&M Zoran Jovanović, Belgrade University Computer Centre – RCUB

Deregulation Telekom Srbija – monopoly until June 2005 Telekom Srbija is (almost) the only owner of intercity fibers Telekom Srbija does not lease dark fiber Expensive high capacity digital links New owners are appearing: Power company, Oil company, Railway, … Cable TV operators in towns

SinSEE Project: Donation of German ministry for science and technology in active networking equipment. Fiber lines established:  RCUB-Rectors office (5km)  RCUB-Novi Sad (95 km – 23dB attenuation)  RCUB-Vinca (15km) All lines installed and working Year 2002

Awareness – ceremony with PM Intercity dark fiber was given only for testing GBIC ZX were for Vinca institute – used for intercity connection Video conferencing of the minister with other university centers Service at the operator didn’t exist – pricing? Strategic approach – to include the new optical infrastructure that is appearing

Year 2003 – Signed Contract with Telekom Srbija – Q3 of 2003  Novi Sad – Subotica (130 km)  Beograd – Kragujevac (130 km)  Beograd – Niš – Gigabit Ethernet over SDH (250 km)  Lines are now being finally tested  8 locations in Belgrade  3 locations in Novi Sad  2 locations in Kragujevac  4 locations in Niš

Key problems in implementation Getting building permissions for dark fiber layout to the university, high school or institute buildings Winter without digging Testing by the operator The only customer with this service Buildings of the operator should be avoided for telehousing by laying out a optical cable to the nearest school or institute – example Belgrade - Kragujevac

Year signed Annex of the contract with Telekom Srbija Phase 1:  Subotica – Szeged! (40 km) - SEEREN Phase 2:  Novi Sad – Zrenjanin  Beograd – Šabac (90 km)  Beograd – Valjevo (90km)  Valjevo – Užice (89 km)  Užice – Čačak (58 km)  Čačak – Kraljevo (33 km)  Kraljevo – Kruševac (83 km)  Kruševac – Niš (84 km)  3 locations in Belgrade

Year Signed Annex of the contract with Telekom Srbija Phase 3:  Beograd - Pančevo (20 km)  Kraljevo – Novi Pazar (91 km)  Niš – Pirot (71 km)  Niš – Leskovac (46 km)  Leskovac – Vranje (68 km)  Niš – Bor (130 km)  Novi Sad – Sombor (72 km)  7 new locations in Belgrade

EuroPACS2004 UChHISand Telemedicine NREN of Serbia and Montenegro Kraljevo BEOGRAD Kragujevac NIŠ NOVI SAD LocalISP Telekom Srbija Podgorica Subotica Bor Leskovac Novi Pazar Šabac Sombor Užice Valjevo Čačak Kruševac Pančevo Zrenjanin Athens/GrNet SEEREN/GEANT Pirot Vranje Szeged/Hungarnet SEEREN/GEANT Nodes: NationalNOC CoreNodes Gbpsnodes International: 1Gbps/100Mbps 34Mbps Internal: 2*1GbpsEthernet 1GbpsEthernet 1GbpsEth/SDH 2Mbps V. Plana

Locations in Belgrade

University hospitals on the NREN GE MAN that will connect most advanced hospitals in Belgrade In Serbia, all medical faculties will have a 1Gbps connection More than 30 buildings of the campus of the Medical faculty and Dentistry faculty in Belgrade will have 1Gps connections by the end of 2004 – Medical campus – laying cables along the heating pipes

Equipment and technologies Gigabit Ethernet  Low cost interfaces  Use of low cost L2 or L3 switches  Sufficient at the moment in Serbian NREN  Use of CWDM  Planning to use of optical amplifiers

CWDM test – July/August 2003 Cisco CWDM test kit Replaced 1000BaseZX Belgrade – Novi Sad (95 km – 23dB att.) 4 Gbps Etherchannel BG Cisco 6509 NS Cisco nm, 1510 nm, 1550 nm, 1590 nm CWDM MUX-4 CWDM MUX-4

Total attenuation Telekom Srbija has G.652 fibers Total attenuation approx: 23dB+3dB+4dB = 30dB CWDM 1000BaseZX optical budget: 30dB Problems expected on 1470 nm 45 days without any carrier transition

CWDM experiment conclusions Can be used on intercity lines for up to 100km Reliable solution, Low cost solution Easy bandwidth upgrade Great flexibility for different logical topologies

CWDM Problems Optical amplification:  EDFA cover narrow wavelength range (typically C-Band or L-Band). In CWDM will be used for a single lambda, when a lambda is dropped, amplified and added.  LOA – Cover broader wavelength range. At the moment of our analysis were available only as product evaluation kits. Noisy, low amplification, narrow bandwith.  Experimental OA for the whole range - Japan

Our solution Majority intercity links are shorter then 100km – daisy-chained If needed - OEO conversion using L3 switches Replacing the OEO conversion with EDFA OA to reduce RTT Drawbacks – in totally Ethernet network – relatively slow convergence, added delay Idea: Justify the use of dark fiber through fast and cheap connection provisioning. Later find the best solution for the network

Potential Belgrade – Novi Sad – Subotica - Hungary connection

Strategy Using CWDM until there is a request for higher bandwidth Try to establish our own intercity optical infrastructure North – South backbone with G.655 cables – combining with e-government Use fiber of other dark fiber suppliers – fault tolerance Establish DWDM if we don’t get our own fiber Establish a SEE backbone for NRENs

Conclusion Widespread use of inter- and intra-city dark fiber is the main direction in which Serbian NREN is moving Cross-border dark fiber connections in SEE region are the next step for inter- NREN connections CWDM with 1 GE is a reliable technology which the Serbian NREN will most probably use in the near future

October 10 th 2004ANW Moldova Thank you for your attention Questions