EndRun RTM3205, Руководство пользователя

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R T M 3 2 0 5 U s e r M a n u a l 2
C H A P T E R O N E
3 R T M 3 2 0 5 U s e r M a n u a l
cesses and are integrated in a solid, high-quality chassis. Since it uses highly efficient ARM micro-
processors, the RTM3205 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
frequency control components are also eliminated so that the extraordinary short-term stability avail-
able from the RTM3205 oscillators is preserved. Up to four outputs can be customer configured at
the time of order supporting a range of analog and digital outputs. Details on the various outputs are
described in
Chapter 10 - Inputs/Outputs (I/O)
and
Appendix K - Specifications
.
Standard Features
The basic RTM3205 provides an RS-232 serial port and dual-gigabit Ethernet ports with a high-band-
width Network Time Protocol (NTP) server. The RTM3205 can be managed via the network port
or the serial port. See
Chapter 3 - Console Port Control and Status,
and
Chapter 7 - NTP
for more
information.
Additional Outputs
Up to four optional outputs are available via SMA connectors. Outputs supported include 10 MHz
low-phase-noise, 1 PPS, pulse rates to 10 MPPS, time code (AM and DCLS), and an open-collector
alarm.
Secure Network Interface
Dual 10/100/1000Base-T Ethernet ports are provided as a standard feature of the RTM3205 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
RTM3205 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 RTM3205 contains a GPS Subsystem composed of EndRun Technologies’ proprietary GPS
Receiver and a system quartz oscillator. All quartz oven controlled oscillators are EndRun Tech-
nologies’ 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 RTM3205’s time synchronization components.