Ortel Communications has informed the exchanges that the credit rating of company’s debt instruments - term loan, fund-based limits and unallocated limits - have been upgraded from [ICRA] BB- to [ICRA] BB. The current rating indicates a stable outlook. Shares of Ortel Communications edged down marginally to ₹201.85 as against the previous day’s close of ₹202.05 on the NSE.