Unix - SysVr3, SCO, AIX, Solaris, BSD, Interactive Linux - any version Firewalls - bastion, dedicated, ancillary, proxy Web Servers - HTTP (Apache), POP, SMTP, FTP Networks - routers, switches, wireless, workstations Telephone - legacy PBX, VoIP
Multi-user computer systems Networks - Ethernet, Fiber-Optic, ATM Backup power - UPS and generators CCTV - hard-wired or networked Two-way Radio - mobiles, base stations, towers Microwave and Infra-red point-to-point links
Prototyping Engineering Repairs Technical support Documentation