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A day earlier, the BSE S&P Sensex closed 254 points or 0.5 per cent higher at 51,280 while the Nifty 50 ticked up by 76 points or 0.51 per cent to 15,175.

BPCL said it will exit Numaligarh refinery in Assam by selling its entire stake to a consortium of Oil India Ltd and Engineers India Ltd for Rs 9,876 crore.

Notwithstanding the sell-off in the broader market, the stock made a debut at Rs 109, reflecting a gain of 15.95 per cent as compared to the issue price on NSE

The dollar index, which gauges the greenback's strength against a basket of six currencies, advanced 0.25 per cent to 90.35.

NSE has multiple telecom links with two service providers to ensure redundancy.

On NSE, it tanked 8.73 per cent to settle at Rs 39.75. In volume terms, 77.57 lakh shares were traded on BSE and over 11.44 crore on NSE.

The dollar index, which gauges the greenback's strength against a basket of six currencies, fell 0.16 per cent to 91.05.

Around 10.25 a.m., Sensex was at 47,954.05, lower by 393.54 points or 0.81 per cent from its previous close of 48,347.59.

On the NSE, the stock closed the counter at Rs 1,444.35, down 2.06 per cent.

The dollar index, which gauges the greenback's strength against a basket of six currencies, slipped 0.03 per cent to 90.10.

On the domestic equity market front, the BSE Sensex was trading 277.80 points or 0.56 per cent higher at 50,069.92.

Bajaj Fiserv was the top gainer in the Sensex pack, rising around 4 per cent, followed by Bajaj Finance, Reliance Industries, IndusInd Bank and Axis Bank.

It has touched an all-time high of 48,168.22 points. Similarly, the Nifty50 on the National Stock Exchange touched a high of 14,114.15 points

Meanwhile, the dollar index, which gauges the greenback's strength against a basket of six currencies, was trading up 0.21 per cent at 90.01.

ONGC was the top laggard in the Sensex pack, shedding around 3 per cent, followed by IndusInd Bank, HDFC twins, Bajaj Finance and Kotak Bank.

UltraTech Cement was the top gainer in the Sensex pack, rising around 1 per cent, followed by Sun Pharma, IndusInd Bank, Reliance Industries and HDFC.

Meanwhile, the dollar index, which gauges the greenback's strength against a basket of six currencies, was trading 0.03 per cent lower at 90.44.

In the Sensex pack, Mahindra and Mahindra, Asian Paints, Tata Steel, Bajaj Finance, ONGC and HDFC were the prominent gainers.

Securities and Exchange Board of India (Sebi), in October, levied a fine of Rs 6 crore on National Stock Exchange (NSE) for allegedly investing in six companies unrelated or non-incidental to the stock exchange business.

Axis Bank was the top loser in the Sensex pack, shedding around 2 per cent, followed by ONGC, M&M, ICICI Bank, Asian Paints, SBI, HUL, L&T, Titan, Infosys and TCS.