ICFA Report

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Appendix 15. CESNET. Research Network Operator,

Czech Republic

http://www.ces.net

Update for ICFA-SCIC, January 2008

Submitted by Helmut Sverenyak (helmut.sverenyak@cesnet.cz)

The following report summarizes changes in the CESNET network infrastructure and its services

for HEP in the Czech Republic in 2007.

CESNET:

CESNET, the Czech National Research and Education Network provider, is an association of

legal entities formed by all universities of the Czech Republic and the Academy of Sciences of

the Czech Republic (ASCR). Its main goals are the operation and development of the Czech

NREN (CESNET2 network), and research and development of advanced network technologies

and applications. CESNET also takes an active part in consortia of several international research

projects in the information and communication technologies area.

CESNET2 Network Status 2007:

The changes of the hybrid CESNET2 network in 2007 has been especially targeted to the further

development of the optical transport layer mainly based on leased optical fiber deployed with

transmission systems owned by CESNET. The small part of this infrastructure is based on

"lighted fiber" services, where the fiber is equipped, according to our requirements, by

transmission system owned by fiber supplier.

The CESNET2 optical DWDM11 backbone operates two types of the DWDM technology, the

main core DWDM system based on commercially available Cisco ONS 15454 MSTP technology

with the ROADM12 and static DWDM systems based on CzechLight family (CL) programmable

device (as the output of one from CESNET research projects). In 2007, the DWDM network was

extended by two new optical spans Plzeň České Budějovice and Hradec Králové Liberec.

The current ROADM technology supports up to 32 optical channels (with 10 Gbps individual

channel capacity) and allows setting up dedicated wavelength paths between any of the nodes

within the whole DWDM system. The system supports alien wavelength transport and ethernet

L2 over DWDM point-to-point and multipoint VLAN or QinQ (using the XPonder card) services.

The family of the CL devices are used for deployment of static cost effective DWDM solutions

over links with lower demand for number of optical channels. However, this system allows to set

up to 32 optical channels by implementing the 32-channel multiplexers/demultiplexers. The 32-

channel solution is alredy used for connecting České Budějovice, Jihlava and Brno PoPs.

Dense Wavelength Division Multiplexing

A reconfigurable optical add-drop multiplexer (ROADM) is a form of optical add-drop multiplexer

that adds the ability to remotely switch traffic from a WDM system at the wavelength layer. This allows individual

wavelengths carrying data channels to be added and dropped from a transport fiber without the need to convert the

signals on all of the WDM channels to electronic signals and back again to optical signals. See

http://en.wikipedia.org/wiki/Reconfigurable_optical_add-drop_multiplexer