You can check the price history of StarTech Dell EMC 3CSFP91 Compatible QSFP+ Module, LC 40km (QSFP40GER4ES) here. This product's current Price in USA is $842.99. The average and highest prices are $798.21 and $842.99 respectively.
100% Dell EMC 3CSFP91 COMPATIBLE: Designed, programmed and tested to work with compatible Dell EMC switches and routers to deliver dependable 40GbE connectivity
TECHNICAL SPECS: 40GBASE-ER4 | 40 Gbps | Single Mode | LC Connector | 1270nm to 1330nm | Digital Diagnostic Monitoring (DDM) | Distances up to 40 km (24.9 mi)
TESTED FOR OEM HOST COMPATIBILITY: Hot-swappable in Dell EMC routers and switches; DDM support reports the transceiver's status to most SNMP network management tools
WORKS WITH MSA COMPLIANT SWITCHES: Also works with switch models from Ubiquiti, D-Link, Netgear, Supermicro, TP-Link and more that accept uncoded modules
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