What is the Zhone Technologies CSFP-GE1490-1310-DL-BIDI-20KM?
The Zhone Technologies CSFP-GE1490-1310-DL-BIDI-20KM is a SFP optical transceiver module, listed by the manufacturer as "CSFP, DUAL BI-DIRECTIONAL, LC TX1490". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.