It appears that the ETECSA is using the line for inbound data while leaning on satellites for outbound traffic.

ENGADGET

According to internet and network analysis firm Renesys, the cable lit up with activity last week with data flowing through it between Telefonica and the nation's state telecom company, Empresa de Telecomunicaciones de Cuba S.A. (ETECSA).

ENGADGET

Earlier this week, though, we began to see discussion regarding traffic passing through a connection to Venezuela, and ETECSA, a government-owned telecom provider, has now confirmed that a 994-mile cable has been operational since August, though in a limited capacity.

ENGADGET: Cuba confirms Alba-1 fiber hook-up to Venezuela, internet remains on lockdown