I work for a utility. Looks to me like its almost certainly a triplex power line. Consists of two insulated hot conductors wrapped around an uninsulated neutral conductor, providing 120/240V split phase power. If OP were to trace the run back to the street it probably is terminated into the three secondary terminals on a pole mounted transformer. Can't advise going anywhere near that if you aren't trained properly.
AFAIK comms cables usually either self supporting or wrapped to a support cable with a thin gauge lashing wire. Doesn't appear to be the case here.
