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General Information
System Interface
As noted previously, the LAN/3000 link interfaces to the host computer system through the LAN
Interface Controller (LANIC). The LANIC functions as an I/O channel and fits into the backplane of HP
3000 Series 39, 40, 42, 44, 48, 64, and 68 computers.
Figure 1-2 shows how the LANIC connects to a Series 39, 40, 42, 44, or 48 computer system. The CPU,
Memory, Asynchronous Data Communications Controller (ADCC) or Advanced Terminal Processor (ATP),
General Input/Output Controller (GIC), Intelligent Network Processor (lNP), and LANIC all physically fit
into the backplane (the backplane is called the Intermodule Bus (1MB)).
INTERMODULE BUS
TERMINALS
AUI
Figure 1-2. HP 3000 Series 39 through 48 System Architecture
The architecture for the Series 64 and 68 computers is significantly different than the other HP 3000
series, as shown in figure 1- 3. The CPU and memory fit into the Central System Bus (CSB), and one or
more IMBs connect to the CSB via Common Bus Interfaces (CBI's) and 1MB Interfaces (lMBI's). I/O DMA
operations do not go directly to memory, but are handled by the 1MB!.
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