The Cisco DS‑SFP‑FC4G‑SW is a hot-swappable 4 Gbps Fibre Channel SFP transceiver designed for Cisco MDS 9000 Series SAN switches. Operating at an 850 nm shortwave wavelength, it supports multimode fiber and LC duplex connections. With auto‑sensing capability for 1, 2, or 4 Gbps speeds, it enables flexible SAN port usage. Typical reach varies by fiber grade—up to ~300 m on OM1, 500 m on OM2, and ≈860 m on OM3 fiber when using lower speeds