M e r i d i a n I I U s e r M a n u a l
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C H A P T E R O N E
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M e r i d i a n I I U s e r M a n u a l
sors, the Meridian II is convection-cooled and the chassis is sealed to eliminate the maintenance and
reliability issues associated with fan-cooled architectures. Air currents flowing over sensitive fre-
quency control components are also eliminated so that the extraordinary short-term stability available
from the Meridian II oscillators is preserved. A complete suite of time and frequency capabilities
with an exceptionally high number and variety of outputs are provided in a 1U or 2U, 19” rack-
mountable chassis. The modular, plug-and-play design of the Meridian II and a wide range of option
cards make it easy to tailor the unit to support your applications.
Standard Features
In addition to sourcing a precision 1 PPS timing reference and an IRIG-B time code output, your Me-
ridian II includes dual gigabit Ethernet ports with a high-bandwidth Network Time Protocol (NTP)
server. The Meridian II incorporates a vibrant, high density, dot-matrix, vacuum-fluorescent display
and a user-friendly keypad design for control and status monitoring. The Meridian II can also be
managed via the network port or a local console on the RS-232 serial port. See
Chapter 12 - Front-
Panel Display and Keypad, Chapter 3 - Control and Status Commands,
and
Chapter 7 - NTP
for
more information.
Secure Network Interface
Dual 10/100/1000Base-T Ethernet ports are provided as a standard feature of the Meridian II with a
wide variety of protocols including NTP, SNMP with Enterprise MIB, SSH, Telnet, FTP, HTTPS,
and SNTP. Refer to
Chapter 2 - Basic Installation
for information to help you set up your network
interface. The inclusion of SNMP v3 and SSH provides a very secure network interface and allows
you to safely perform monitoring and maintenance activities over the network. Security-conscious
users can also disable any or all of the risky protocols such as HTTPS, Telnet, Time and Daytime. In
addition, access via SSH, SNMP and Telnet can be restricted to specific hosts. Refer to
Chapter 6
- SNMP
and
Chapter 5 - Security
for further information.
Free FLASH Upgrades
Firmware and configurable hardware parameters are stored in non-volatile FLASH memory, so the
Meridian II can be easily and securely upgraded in the field using SSH and SCP or the local RS-232
serial port. Upgrades via FTP and Telnet are also possible although these protocols are not secure.
We make all firmware upgrades to our products available to our customers free of charge. For firm-
ware upgrade procedures refer to
Appendix B - Upgrading the Firmware
.
Time Synchronization
Components
The Meridian II contains a GPS Subsystem composed of EndRun Technologies’ proprietary GPS Re-
ceiver and a system quartz or Rubidium oscillator. All quartz oven controlled oscillators are EndRun
Technologies’ proprietary design as well, and provide state-of-the-art close-in phase noise and short-
term stability. The GPS Subsystem is integrated with a fanless, convection-cooled high performance
ARM CPU with two integrated Ethernet ports that provide NTP (and optionally IEEE 1588/PTP).
This is called the Linux/NTP Subsystem. Figure 1 shows Meridian II’s time synchronization compo-
nents.
Summary of Contents for Meridian II
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