The Cisco industry-standard Small Form-Factor Pluggable Interface Converter (SFP) for packet-over-SONET/SDH (POS), optical networking, and ATM applications are hot-swappable optical interface that plugs into a variety of ports on Cisco router interfaces. Cisco SFP optic for POS and ATM applications plug into a variety of SFP-based POS, TDM and ATM interfaces on Cisco router products.