https://www.cisco.com/c/en/us/products/collateral/interfaces-modules/sonet-sdh-sfp-modules/datasheet-c78-744016.html
Cisco SFP Optics For Packet-Over-Sonet/SDH and ATM Applications Data Sheet - Cisco
The Cisco industry-standard Small Form-Factor Pluggable Interface Converter (SFP) for Packet-Over-SONET/SDH (POS), optical networking, and ATM applications are...
packet over sonet sdh
https://www.cisco.com/c/en/us/products/collateral/interfaces-modules/7300-1-port-oc-12c-stm-4-packet-over-sonet-sdh-line-card/product_data_sheet09186a008008877b.html
One and Two-Port OC-12c/STM-4 Packet over SONET/SDH Linecard - Cisco
One and Two-Port OC-12c/STM-4 Packet over SONET/SDH Linecard
packet over sonet sdh