The Cisco ONS 15216 4 Channel Optical Add/Drop Multiplexers (OADMs) are a set of passive OADMs that allow the Cisco ONS 15454 Multiservice Transport Platform (MSTP) to address the edge of the optical network in a costeffective manner without sacrificing operational ease of use. The Cisco ONS 15216 4 Channel OADMs are well suited to applications with minimal wavelength requirements and tight space and power constraints, such as cell site and customer premises terminations.