Table of Contents
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Theory of Operations
Digital Processing and Digital Control Group Operation
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:
USB x4
Four universal serial bus (USB) jacks (industry standard 4-pin connectors).
GPIB (0)
A 24-pin, female, type D-24 connector that meets IEEE-488 standards.
Controller
GPIB (1)
A 24-pin, female, type D-24 connector that meets IEEE-488 standards.
Talker/Listener
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.
A55 Solid State Drive
The solid state drive assembly (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
hard disk drive.
Keysight N5244B/45B Service Guide
5-61
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Table of Contents
Troubleshooting
