What is the Cisco OSM-1CHOC12/T3-SI?
The Cisco OSM-1CHOC12/T3-SI is a circuit card / line card, listed by the manufacturer as "1 Port CHOC12/STM4/T3/E3 Card". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.
CircularTelecomParts Catalogue

Part Overview
The Cisco OSM-1CHOC12/T3-SI is a circuit card / line card — originally specified as "1 Port CHOC12/STM4/T3/E3 Card" — available refurbished or as surplus stock via Circular Telecom, supporting network operators sourcing decommissioned and reclaimed equipment.
Common Questions
The Cisco OSM-1CHOC12/T3-SI is a circuit card / line card, listed by the manufacturer as "1 Port CHOC12/STM4/T3/E3 Card". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.
Circular Telecom sources and resells surplus and refurbished Cisco network equipment, including parts such as the OSM-1CHOC12/T3-SI, subject to current availability. Contact Circular Telecom for a live quote.
Circular Telecom Catalogue