Allied Telesis XEM2-4QS Expansion Module - For Data Networking, Optical NetworkOptical Fiber40 Gigabit Ethernet - 40GBase-X - 4 x Expansion Slots - QSFP+
The XEM2-4QS provides 4 x 40G QSFP+ ports per module, which can be configured as stacking links, or as high-capacity backbone links for distributed networks.
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