unlike Hand Maid Mai, or Boku no Mari or some other robot anime, where fan service is a part of the design (of course) ping is far more neutral in design.
all of pings outside world connections, data ports, power outlets, etc, are part of her 'earblades' - note that the one on her left side is primarily data (it has the lcd readout panel, some control buttons, and a host of other connections. the right side is primarily power related (ping can run on standard power, and doesnt need a transformer to charge up)
she doesnt have any other data inputs. Since she is a prototype, her earblades are far bigger than the production models will have, but the idea is that these control and connection inputs are much like jewelry.