They won't be able to provide gigabit speeds anytime soon. Their infra isn't ready for gigabit speeds. Sure, they have the capacity to provide gigabit. But in most of the BSNL exchanges they are using 100Mbps OLTs except a few exchanges. Only LCOs are using gigabit OLTs. And if the connection is being provided through LCO, gigabit speeds are out of the question. LCOs are provided with 2-3 gigabit fibre ports with link aggregation in my area. So unless they upgrade it to QSFP or better they won't be able to satisfy bandwidth requirements. Being a PSU has it's own perks. But infrastructure upgrade is not one of them.