An apparatus for transmitting laser light and redirecting the light laterally relative to an axis of the apparatus includes an optical fiber having both a core and a cladding surrounding the core. The system includes an optical wavelength multiplexing signal acquisition unit for outputting an optical wavelength multiplexing signal. Each VR maintains a data structure containing therein information regarding the multicast sessions, including a first value for each of the multicast sessions, at least one chain of one or more blocks of second values and one or more transmit control blocks. 2% helium, and any balance being argon. A ground window is formed on the back cover so that the ground node of the circuit board is directly exposed.