S o n o m a U s e r M a n u a l
1
"Smarter Timing Solutions"
Chapter
One
Introduction
This chapter introduces the CDMA-Synchronized Sonoma Network Time Server and gives a brief
overview of what it is and how it works.
What It Is
The Sonoma is a precision server of Universal Coordinated Time (UTC) that can be connected via an
Ethernet port to any TCP/IP network. Available timing protocols include: Network Time Protocol
(NTP), Simple Network Time Protocol (SNTP), Time, Daytime, and the optional Precision Time
Protocol (PTP/IEEE-1588).
In its most basic operation, the Sonoma sends NTP reply packets in response to NTP request packets
which it has received from clients. The timestamps it sends in its NTP reply packets are accurate to
10 microseconds, typical. For an introductory paper on NTP see:
http://www.endruntechnologies.com/pdf/NTP-Intro.pdf
Time Synchronization Components
The Sonoma is composed of a Code Division Multiple Access (CDMA) Subsystem containing a
CDMA Receiver and system oscillator. The CDMA Subsystem is integrated with a fanless, convec-
tion-cooled 1.2 GHz CPU with two integrated Ethernet ports that provide NTP (and optionally PTP).
This is called the Linux/NTP Subsystem. The drawing below shows Sonoma’s time synchronization
components.
System
Oscillator
CDMA
Subsystem
Processor
Receiver
Oscillator
CDMAReceiver Module
Receiver
Processor
1PPS
DAC
DAC
10MHz
Linux/NTPSubsystem
(PTP optional)
1PPS
10MHz
CDMA Subsystem
Summary of Contents for Sonoma D12
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