A masterslave tank system for storing a compressed hydrogen gas, where the system employs an electrically driven shut-off valve for each tank in the system. The optical signal characteristics can be obtained with minimal signal loss in the optical signal path and reduced RF crosstalk, while the electrostatic discharge threshold for the photonic integrated circuit is increased, due to the inclusion of a second electro-optic element electrically coupled to a first electro-optic element as part of the signal channel. The RAN may be arranged to receive, from a user equipment device that is being served by a base station of the RAN on a first carrier frequency, a report indicating threshold low wireless performance on the first carrier frequency. A first of the shoulders engages a bar attached to the lid so as to hold the lid in a closed position.