This HP LaserJet 4050 is available in four configurations.

HP LaserJet 4050
The HP 4050 comes standard with 8 MB RAM and one 500-sheet tray.
HP LaserJet 4050 N
The HP 4050N comes standard with 16 MB RAM, an HP JetDirect card for connecting to a network, and one 500-sheet tray.
HP LaserJet 4050 T
The HP LaserJet 4050T comes standard with 8 MB RAM and two 250-sheet trays.
HP LaserJet 4050 TN
The HP LaserJet 4050TN comes standard with 16 MB RAM, an HP JetDirect card for connecting to a network, and two 250-sheet trays.

Product Data Sheet -- HP laserjet 4050 (848 Kb pdf file)
Users Manuals available at HP's website.