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Support of HEP:

A 155 Mbps dedicated link from Yangbajing in Tibet to IHEP in Beijing was established with the

help of CSTNET. This link is used for the YBJ-ARGO cosmic ray experiment being carried out

in Yangbajing and more than 200 TB of data are supposed to be transferred every year.

CERNET and IHEP reached an agreement to use TEIN2/ORIENT to support LHC and YBJ-

ARGO experiments. From June of 2007, IHEP switched its route to TEIN2/ORIENT so that a

better network link to Europe was obtained. Figure 48 demonstrates a significant reduction of

network latency between IHEP and CC-IN2P3 compared to the previous link via GLORIAD.

Figure 48: Network latency reduction by changing route from GLORIAD to TEIN2

Although the network latency between IHEP and FNAL is reasonable, the network performance

was very bad for transferring data between IHEP and FNAL. This was caused by the asymmetry

of route tables of from IHEP to FNAL and from FNAL to IHEP. IHEP worked together with

FNAL to tune the route tables so that the link can benefit from GLORIAD. Figure 49 shows the

status of network for HEP applications in China.

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