Hitachi G400 Hardware Reference Manual page 65

To remove an optical cable, push the top of the connector of the optical cable
(1) to release the latch and remove the SAS cable (2).
To remove a LAN cable, push the top of the LAN cable connector (1) to
release the latch and remove the LAN cable (2).
Maintaining the storage system 65
Hitachi Virtual Storage Platform G400, G600 Hardware Reference Guide