The HP LaserJet 4300 is available in four configurations.

HP LaserJet 4300
The HP 4300 comes standard with 64 MB RAM and one 500-sheet tray.
HP LaserJet 4300 N
The HP 4200N comes standard with 80 MB RAM, an HP JetDirect card for connecting to a network, and one 500-sheet tray.
HP LaserJet 4300 TN
The HP LaserJet 4300TN comes standard with 80 MB RAM, an HP Jet Direct card for connecting to a network, and two 500-sheet trays.
HP LaserJet 4300 DTN
The HP LaserJet 4200DTN comes standard with 80 MB RAM, an HP JetDirect card for connecting to a network, two 500-sheet trays, and a duplexer.

Product Data Sheet -- HP LaserJet 4300 (187 Kb pdf file)
Users Manuals available at HP's website.