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The figure below shows the main regions where the hosts are located and how the regions are connected by PERN:
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Map of the PERN backbone |
The difficulty of the installations has varied host to host. The technical installation has been simple and not resulted in delays. The delays between deciding to install a monitoring host and gathering measurements from the host have mostly been due to: machine availability; getting administrative approval within university; and delays in making the DNS record entry. The table below shows the history of the installations:
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It is interesting to see (right hand map above) the large differences in minimum RTT between PERN and say NCP (at Quaid i Azam university in N.E. Islamabad) of < 10msec (blue line or more exactly 1.3msec) and that between PERN and NUST in the S.W. corner of between 40-80msec (red line or more exactly 44msec.). Presumably this is due to the routing of PERN connections in Islamabad region. Also interesting to see (middle map above) is that the connection from NUST to the DSL site (blue line) is much less than that to the physically closer NUST host. This host (lo-0-gw.dsl.net.pk) is connected via Micronet broadband connection rather than most ofthe other hosts which are connected via the PERN backbone.
Archive, analysis site
IN 2010, a second instance of the SLAC archive-analysis site was set up at NUST. This provides backup for data and access, and improved performance for Pakistani users.
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