Laptop Maintenance cable You can use the optical termination hood CL61TERMHOOD: Outdoors if the sky is unclear Indoors to represent a clear, nighttime sky 1 Termination hood 2 Maintenance cable Make sure that the inside of the hood is clean. Place the termination hood over CL61. Connect to CL61. Use the maintenance cable or connect over Ethernet. To adjust the reference values, see CL61 User Guide (M212475EN).