SFP-25G-AOC4M=

The SFP-25G-AOC4M is a 25 Gigabit active optical cable, 4 m long, with an SFP28 connector on each end and multimode fibre between them. The slim fibre jacket is lighter than twinax copper, which helps in crowded trays and server cabinets. The optics are sealed inside the connector bodies, so installation is simply plugging in both ends. The length gives some freedom in equipment placement, so the switch need not sit in the exact middle of the rack. Both ends are permanently attached, so nothing needs cleaning, and the whole cable is replaced if either end is damaged. Keep a spare of the same length on the shelf if the link is critical, as there is no field repair for a moulded cable. It is intended for data-centre environments and has a standard commercial temperature range. Cisco's 25GBASE SFP28 data sheet lists it as a 25GBASE-AOC assembly and says the host may use either BASE-R or RS-FEC. Because it is built to a set length, stock planning is by length, so a rack plan listing each link helps ordering.