STN6800-OA1: EDFA Card for STN6800 Platform The STN6800-OA1 is a series of DWDM C-Band Amplification Card based on Erbium Doped Fiber Amplifier (EDFA) including Booster Amplifiers (BA), Line Amplifiers (LA), and Pre-Amplifiers (PA). It typically operates in the C-band range (1529~1561nm) and can discuss specific working wavelength ranges with Sino-Telecom. The amplification card can be operated under constant gain (Automatic Gain Control, AGC) or constant output power (Automatic Power Control, APC).