The Cisco industry-standard Small Form-Factor Pluggable Interface Converter (SFP) for packet-over-SONET/SDH (POS), optical networking, and ATM applications is hot-swappable optical interfaces that plug into a variety of ports on Cisco router interfaces. This SFP optics support OC-3 data rates for Long-Reach.
OC-3/STM-1 Long-Reach SFP Transceiver Module
