The Cisco ONS 15216 Exposed Faceplate Mux/Demux 48-Channel Extended Bandwidth Patch Panel is a standalone unit that contains both a 48-channel optical multiplexer and a 48-channel optical demultiplexer, pre-cabled within the unit's housing.
These units provide support for higher baud rate (40GBaud/s and above) coherent signals that have higher bandwidth and need higher passband filters. These units should not be used with non-coherent DWDM channels due to lower channel isolation