In his letter, which comes a day after a technical glitch forced the bourse to halt trading for over three hours, Chawla said yesterday's situation was handled effectively which is indeed the NSE's responsibility as the largest exchange.
"Yesterday's technical glitch is, proverbially speaking, one more straw on the camel's back. While such a situation is a Black Swan event, it unfortunately puts the NSE in the spotlight for the wrong reasons," the letter said.
"At the same time, it has been a period of challenges - challenges on the organisational front, stress over the legacy technology issues, re-energising of relations with stakeholders across the spectrum from the regulator to shareholders," he said.
Last month, vice chairman Ravi Narain had put in his papers amid regulators intensifying their probe into alleged lapses in high-frequency trading offered through the exchange's 'co-location' facility.
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The role of some top officials including Narain, who had also served as CEO of the bourse, is being looked into by markets regulator Sebi.
"Today I am writing to convey that we are no doubt passing through difficult times but that we shall overcome," Chawla said.
The capability and professionalism of the NSE's human capital is well known, he said, adding that he has been fortunate to have seen it from close quarters.
"... In this time of organisational stress, let us resolve to treat the challenge as opportunity. Let us work as a family to once again show that it is not for nothing that the NSE has become a world-class institution in a short span of 25 years," the chairman said.