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Optical networking in
CESNET
Jan Radil, Stanislav Šíma, Lada Altmanová
jan.radil@cesnet.cz
Dark fibres
Dark fibres
Connect every PoP of CESNET2(3) gigabit
network, distances up to 300 km
 Double access to PoPs – restoration, no
single point of failure
 Access to CzechLight center in Praha (and
other cities in the future)
 GE and SDH/SONET

Dark fibres
HW used
 Cisco routers and switches
 Keopsys optical amplifiers
 Nbase-Xyplex convertors (SM-MM, to one
fiber, lambdas)
 Information about HW & DF in your
networks?

CESNET2 topology
CzechLight
Participation in international project
StarLight, NetherLight, now CzechLight
 „lambda service“ with Cisco ONS 15454
 2.5 G lambda to Amsterdam
 Operational since January 2003
 Access to Amsterdam, Geneva, Chicago
 TDM box, high-end router is needed

10 Gigabit Ethernet
Negotiation of contract for HW
 Catalyst 6503 with ER modules (1550 nm)
 Optical amplifiers, fiber test-beds prepared
 First 10 GE backbone line is operated by
PASNET (metropolitan acadamic network)
 1310 LR modules, 1 fibre transmission,
passive splitters, length 6 km

10 Gigabit Ethernet
10 Gigabit Ethernet
10 Gigabit Ethernet
10 Gigabit Ethernet
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Similar scenarios as with testing 1 GE (NIL)
Some results (1GE) published on Terena 2002
More detailed paper on Terena 2003
Simulating SW – problems with parameters of
lasers used in „standart“ equipment (central
wavelength, chirp, stability)
DWDM lasers preferred for long-distance
transmissions
10 Gigabit Ethernet
In my opinion, we can go over 40 km
 Again, our goal is Nothing-In-Line solution
