What is the Ciena 170-3931-850?
The Ciena 170-3931-850 is an equipment module, listed by the manufacturer as "CN3931 SYSTEM MODULE PRNCD". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.
CircularTelecomParts Catalogue

Part Overview
The Ciena 170-3931-850 is an equipment module — originally specified as "CN3931 SYSTEM MODULE PRNCD" — available refurbished or as surplus stock via Circular Telecom, supporting network operators sourcing decommissioned and reclaimed equipment.
Common Questions
The Ciena 170-3931-850 is an equipment module, listed by the manufacturer as "CN3931 SYSTEM MODULE PRNCD". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.
Circular Telecom sources and resells surplus and refurbished Ciena network equipment, including parts such as the 170-3931-850, subject to current availability. Contact Circular Telecom for a live quote.
Circular Telecom Catalogue