multiterabit (1)

WELCOME

MULTITERABITNETWORKS

INTRODUCTIONThe communication will be dominatedby data, we can expect the networkof the future to consist ofmultiterabit packet switches toaggregate traffic at the edges ofthe network and cross connects withwavelength granularity and tens ofterabits through out the core andthis application continuous to driveoptical technology.

Transport Methods

• Circuit Based• Packet Based

SDH/SONET• It provides very high level of protection.

• It is more expensive than Ethernet.

• It based on point to point and meshednetwork.

• Resilent packet ring combines resilience ofSDH/SONET with the lower cost ofIP/Ethernet.

• Resilent Fast Ethernet Ring (RFER) ,newtopology that delivers SDH/SONET typeresilience at Ethernet cost for small tomedium application.

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Limitations of SONETWaste of bandwidth meshing.Fixed circuits.Wasted protection bandwidth.Multicast traffic.

Limitations of Ethernet

• Ethernet does suitable for path levelprotection.

• It provide small operation than sonet.• It is also not good at implementing

global fairness policies for sharingring bandwidth.

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RPR operationIt uses dual counter rotating fiber ring topology.It helps as to

Topology updatesProtectionBandwidth control

RPR is a layer to MAC based technology , it can operate overmultiple physical layers, including SONET.RPR over the SONET can be provide the application are VoIP,packet video and distance learning.RPR over the Ethernet provides traffic is send in both directions

on the ring to achieve the maximum band width utilization.

MAC BLOCK DIAGRAM

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Advantageous of packetring over the circuit basedResilencing.Band width fairness.Broadcast or multicast traffic.Physical layer versatality.

Advantageous of SONET• More secure data transmission.

Applications ofmultiterabit networks

• It use networking technologies.• Multiterabit optical fiber network

for a LOFAR telescope.• Multiterabit transmission over

Alcatel teralight fiber.

ASSESSMENT OF GIGABIT ETHERNET TECHNOLOGYFOR THE LOFAR MULTI-TERABIT NETWORK

• ABSTRACT• The LOFAR radio telescope, which is currently being developed, can be

considered as a massive digital data processing• instrument for astronomy. The telescope requires an aggregated data

transport bandwidth of order twenty Terabits per• second. A logical transport network is proposed that can be mapped

onto emerging technology in a flexible way. For• interfacing the equipment to the network we analyze ten Gigabit

Ethernet technology being developed for the PC• market and becoming commercially available in the coming years.

Network management and throughput aspects will• be discussed in relation to the required flexibility in operational

conditions.

RNAL CABLE SYSTEM• REACH North Asia Loop (RNAL) is a multi terabit intra Asia self-healing submarine

telecommunications cable system connecting the principal cities in Asia.• The 10,000 km cable network provides intra regional, city-to-city connectivity

between Hong Kong, Seoul, Tokyo, and Taipei. • The cable network has been developed jointly by REACH and FLAG Telecom.

REACH has constructed the eastern leg of the multi-terabit cable that connects Japan, Taiwan, and Hong Kong, while FLAG has built the western leg connecting Japan, Hong Kong, and Korea.

• FLAG manages and operates the system on its own behalf and that of REACH under a developmental agreement. FLAG and REACH each own three of the system’s six fiber pairs. REACH markets its share of the system as REACH North Asia Loop (RNAL).

• RNAL has the largest share of cable capacity in Asia with 29%. (second largest share of capacity: C2C with 25%) (1)

• It has landing points in:• Tong Fuk, Lantau Island, Hong Kong• Pusan, South Korea