Network devices from various authors:

Generic ATM switch, Digital Service Unit/Channel Service Unit and Netcom
	Smartbit network tester by Bill Chimiak
Cisco network devices by Louis B. Moore
10/100 Ether network hub by Dirko van Schalkwyk
Firewall symbol and "generic hardware" by Tomi Ollila
Miscellaneous network components by T. Sato
NodeB, cloud, router, wlan by Markus Laner
