Telecom tribunal TDSAT on Tuesday reserved its order on a plea by US based chip maker Qualcomm’s petition against the reduction of the validity of wireless broadband spectrum allotted to it and the roll out obligations.

TDSAT bench headed by its Chairman Justice S B Sinha heard the arguments from the Department of Telecom (DoT) and Qualcomm and reserved its order.

DoT had reduced the validity of Qualcomm's Broadband Wireless Access (BWA) spectrum to 18 years and six months, from 20 years.

Qualcomm's roll-out obligation period was also reduced from five years to three and a half years, which has been challenged by the chipmaker before the Telecom Disputes Settlement and Appellate Tribunal.

The company had moved TDSAT against this.

The company had won spectrum for high speed data services in four circles Delhi, Mumbai, Haryana and Kerala through auction in June 2010, and paid Rs 4,912.54 crore (about USD 1 billion) for the same.