Deploying the 1B processor involved installing and retrofitting it in
a live, fully operational 4ESS(TM) switch. The customer requirements f
or deploying the 1B processor were simple, clear, and stark: ''flawles
s execution with no interruption to service.'' To accomplish this, spe
cial bus switches were designed to allow peripheral units to be switch
ed from the 1A to the 1B processor as part of the retrofit. The aggres
sive schedule called for installing the 1B processor in 134 AT&T switc
hes in only 16 months. This paper describes the unique customer-suppli
er partnering approach used to meet the customer requirement of ''flaw
less execution.'' It also discusses the major leadership-based procedu
res used to improve processes and eliminate risks.