R T M 3 2 0 5 U s e r M a n u a l
103
"Smarter Timing Solutions"
Chapter
Twelve
Optional Synchronous Ethernet (SyncE)
When locked to GPS, the RTM3205 can operate as a Synchronous Ethernet Primary Reference
Clock (PRC). This chapter contains the information for the optional Synchronous Ethernet protocol
(SyncE). SyncE is most often used in telecom applications.
Software Option
The Synchronous Ethernet protocol is an optional feature in the RTM3205. Read
Appendix I - Soft-
ware Options
if you need information on how to install a software option. If you are unsure whether
your device has SyncE installed, use the
installed_sw_opts
command:
Command:
installed_sw_opts
RTM3205 reply: <no reply>
or
Command:
installed_sw_opts
RTM3205 reply:
The SyncE Option is Installed.
If you would like SyncE and it is not installed, then contact EndRun Technologies.
About SyncE
Synchronous Ethernet, also referred as SyncE, is an ITU-T standard for computer networking that
facilitates the transference of clock signals over the Ethernet physical layer (Layer 1). In addition to
the physical clock signals, the Synchronization Status Messaging (SSM) is transmitted on the data
link layer (Layer 2). The Ethernet Synchronization Messaging Channel (ESMC) contains the clock
Quality Level (QL) with the embedded SSM code.
The RTM3205 is configured as a Synchronous Ethernet Primary Reference Clock (PRS) when tightly
locked to GPS (TFOM <= 4. See
Appendix A - TFOM
). There is no SyncE user configuration re-
quired.
Synchronous Ethernet is defined in the ITU-T:
G.8261 Architecture and wander performance
G.8262 Timing characteristics
G.8264 Ethernet Synchronization Message Channel (ESMC)
More information on SyncE can be found at the ITU-T Telecommunications Standardization Sector
website:
Summary of Contents for RTM3205
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