AddOn Alcatel-Lucent SFP-GIG-T Compatible TAA Compliant 10-100-1000Base-TX SFP Transceiver (Copper, 100m, RJ-45) 1 x Hex Bit (2 mm) because the hub is designed

because the hub is designed with a solid-aluminum casing

anodized aluminum enclosure is built to meet the most stringent standards for military-grade strength and durability

legs and lower back

and ships with a low profile/half-height bracket installed but includes an optional full profile bracket that lets you add 2 serial ports to virtually any computer (regardless of the case form factor)

In other words

AddOn Alcatel-Lucent SFP-GIG-T Compatible TAA Compliant 10-100-1000Base-TX SFP Transceiver (Copper, 100m, RJ-45) 1 x Hex Bit (2 mm) because the hub is designedOmniSwitch Series switches use copper based Small Form Factor Pluggable (SFP) transceivers. Gigabit Ethernet SFP Module is fully hot swappable and are available for both short reach and long reach applications. Copper based and fiber based optical SFPs can be mixed on the same module. Supports twisted pair cables for durability and improved signal transfer while ensuring smooth and seamless data transfer Gigabit Ethernet port for ultra fast network