This document is an operator's handbook that provides information about Alcatel's METRO OMSN products. It includes safety norms and labels, describes the structure and purpose of the handbook, and discusses Alcatel's customer documentation processes. The handbook covers Alcatel's 1640FOX, 1650SMC, 1660SM, and 1660SM product lines and is intended to instruct operators on the proper use of these STM-1/4 and STM-16/64 multiservice metro nodes.