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Continue to Chathttps://www.longlinestore.com/cisco-ons-si-2g-l1-compatible-oc-48/stm-16-lr-1-sfp-1310nm-40km-dom-lc-smf-transceiver-module - Cisco ONS-SI-2G-L1 Compatible OC-48/STM-16 LR-1 SFP 1310nm 40km DOM LC SMF Transceiver Module