ABB 1MRK002122-ABr03 Local Communication Module (LDCM)The optical budget for the 670 series with 64 kbit communication using the C37. 94 interface and fiberoptic communication varies based on the wavelength and fiber type. Here's a breakdown: Multimode Fiber (Glass 50 125 m) 850 nm Minimum output power: 21 dBm Minimum receiver sensitivity: 30 dBm Optical budget: 9 dB Multimode Fiber (Glass 62. 5 125 m) 850 nm Minimum output power: 17 dBm Minimum receiver sensitivity: 30 dBm Optical budget: 13 dB Single