Amazon.com: HP 2530 J9772A ProCurve 48 Port Gigabit Switch : Electronics
Ubiquiti Networks (USW-PRO-48-POE) 48 Port Rack Mountable Switch for sale online | eBay
48 Port Gigabit L2+ Switch, with 6 x 10Gb SFP+ Uplinks, S3900-48T6S-R - FS
48 Port Switches: Gigabit, PoE, & More | NETGEAR
Amazon.com: NETGEAR 48-Port Gigabit Ethernet Smart Switch (GS748T) - Managed, with 2 x 1G SFP and 2 x 1G Combo, Desktop or Rackmount, and Limited Lifetime Protection : Electronics