NSE informs trading members about possible Sun outage impact

Exchange has been informed by ISRO that there will be 'sun outage' from Sept 24, 2013 till Oct 8, 2013

Leading bourse National Stock Exchange (NSE) today informed trading members that they may face connectivity problems at various times due to 'sun outage' between September 24 and October 8.

Sun outage periods, with a duration of 15 days, generally occur twice every year when there is interruption in geostationary satellite signals caused by interference from solar radiation.

The exchange has been informed by the Indian Space Research Organisation (ISRO) that there would be 'sun outage' from September 24, 2013 till October 8, 2013 between 1335 hrs to 1410 hrs.

It also asked the intermediaries to use alternative mode of connectivity instead of VSAT during this period.

VSATs (Very Small Aperture Terminals) are two-way satellite ground stations and access satellites in to relay data from small remote earth stations to other terminals or master earth station hubs.

In a circular, NSE said its "trading members may face connectivity problems at different times on different dates based on their geographical location during 'sun outage' period."

The exchange said that trading would not be closed and would continue in the normal course during 'sun outage period.

Earlier, stock exchanges have been suspending trading for about 40 minutes on these 'sun outage' days due to the disruptions in satellite signals causing problems in the transmissions between trading terminals and trading platforms.