5-46 Keysight N5227B Service Guide
Theory of Operation
Digital Processing and Digital Control Group Operation
5-
Main RAM
The main random access memory (RAM) is shared memory for the CPU and the
DSP. It stores the raw data received from the DSP while additional calculations
are performed on it by the CPU. The CPU reads the resulting formatted data
from the main RAM, converts it to a user-definable display format, and writes
this to the video processor for display.
Rear Panel Interconnects
The rear panel includes the following interfaces:
A55 Solid State Drive (SSD)
The SSD is a Serial Advanced Technology Attachment (SATA) data storage
device which is connected directly to, and physically mounted within the
enclosure of, the A21 CPU board. The full operating system and firmware for
the network analyzer is stored on the A55 SSD.
USB x4
Four universal serial bus (USB) jacks (industry standard 4-pin connectors).
GPIB (0)
Controller
A 24-pin, female, type D-24 connector that meets IEEE-488 standards.
GPIB (1)
Talker/Listener
A 24-pin, female, type D-24 connector that meets IEEE-488 standards.
LAN
A standard 8-pin, 10/100BaseT, Ethernet connection. It auto selects between the two data
rates.
Display (VGA)
A 15-pin, female, D-sub connector that provides a video output of the analyzer display that can
be viewed on an external VGA monitor.
