The Cisco ONS 15216 EDFA1 provides bandwidth-on-demand to extend DWDM links by hundreds of kilometers. This manual describes how to install and operate the ONS 15216 EDFA1, which is a DWDM-enabling technology for multiservice ring DWDM networks. The ONS 15216 EDFA1 is part of the Cisco ONS 15216 metro regional DWDM product line that includes red and blue terminal filters, a one-channel and two-channel optical add/drop multiplexer (OADM), and an optical performance manager (OPM).??The ONS 15216 EDFA1 is a C-band EDFA that has constant gain control, gain-flatness, transient suppression, and low-noise figure optimized for metro DWDM applications. These features enable the ONS 15216 EDFA1 to add/drop optical signals from a span in a DWDM network without degrading of the other optical signals in the same span.??The ONS 15216 EDFA1 uses gain-control technology, which is the ability to keep the amplification per wavelength constant at all times as wavelengths are added/dropped from an opt...