What does my hardware CE mean when he mentions “base frame” or “900 frame?
The “base frame” refers to the 3745. For modern, current-level FEPs, this is the 3745-31A or 3745-61A. The base frame contains control storage for the operation of licensed code (Network Control Program). The base frame may also include other features such as channel adapters, low or high speed line adapters or possibly token ring couplers. However most modern FEPs place these functional components in the corresponding “900 frame.” The “900 frame” refers to the 3746-900, which bus connects to the 3745 “base frame.” The 900 frame generally houses some combination of processors and adapters for ESCON, token ring, high speed lines and low speed lines. The base and 900 frames communicate with a service processor (SP4) over a dedicated service LAN.
