11 years
mci - fiber optic transport OC-48 and OC192, fujitsu, alcatel, nortel, siemens, pirelli, optical amplifiers, long distance RAB3's and higher.
worldcom - local fiber rings, lucent DDM/FT-2000 and switch services, dial tone, PBX, 5ESS
at&t/t-mo/verizon - employee and contractor doing cell site turn up (nokia, ericsson, lucent) and MSC duties (DMS, 5ESS) for GSM mostly.
large background in the AT&T lucent UMTS roll out for UTRAN and MSC.
currently doing fiber optics for a CLEC in california, OC48/192 rings with RAB3 services and higher, although we have a DMS and 5ESS i don't work in them.
i love telecom theory.