This document summarizes the key specifications of a universal sub-rack that can be installed in N63B and N66B cabinets to support OSN8800 and OSN6800 network equipment. The sub-rack runs on 63 amps of power supply and has a maximum power consumption of 2400W when fully loaded. It also describes the basic components of a DWDM system, including optical transponders, MUX-DEMUX units, optical amplifiers, and supervisory channels.