• Two RJ-12 serial string output ports
• Two optical fiber output ports that can output the standard GridTime 3000 pulse outputs
• A high voltage MOSFET switch, that can also be used with an external voltage source to output the standard
GridTime 3000 pulse outputs
Figure 6-7. Synchronization and Timing Port Connections
GridTime™
3000
Software-Enabled Time Server
6.6.2.1
Ethernet Ports - RJ-45, SFP, and SFP+ Ports
This section describes how to form a connection to the GridTime 3000's Ethernet ports.
The GridTime 3000 features ten ports for NTP and PTP time synchronization over a packet-switched network:
• two 10/100/1000BASE-T RJ-45 ports — ETH01 and ETH02
• six 1 Gbps Ethernet small form factor pluggable (SFP) ports — ETH03-ETH08
• two 10 Gbps Ethernet SFP+ ports — ETH09 and ETH10.
These are collectively labeled the ‘ETH’ ports, as seen on the front panel decal.
Figure 6-8. GridTime 3000 Ethernet Ports
GridTime™
3000
Software-Enabled Time Server
RJ-45
Ports
SFP
Ports
SFP+
Ports
6.6.2.1.1 Network Architecture Recommendations
This section provides some general architecture recommendations when using the GridTime 3000 to deliver time
over Ethernet.
• Take note of all the network hops between the time server port and your end devices
• Optimize your architecture to reduce network hops, this improves timing accuracy. A star topology is
recommended over a ring or single bus topology for this reason.
• Use boundary clocks if long transmission distances and multiple network hops are needed. This helps to reduce
jitter and signal instability that can accumulate with multiple hops through switches.
6.6.2.1.2 ETH01 and ETH02 (RJ-45)
This section describes how to connect to Eth1 or Eth2 on the GridTime 3000.
The RJ-45 ports are standard 10/100/1000BASE-T RJ-45 receptacles.
Cabling recommendations:
• use a copper Ethernet cable terminated with an RJ-45 plug
• follow the cable’s manufacturer recommendations
• ensure the cable supports your link speed requirements
Network device recommendations:
• ensure all relevant network ports can auto-negotiate link speed, and are capable of at least one of the following:
– 10BASE-T transmission
– 100BASE-T transmission
– 1000BASE-T transmission.
• use PTP aware network switches if you plan to use PTP as this will greatly improve timing accuracy.
Installation
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2022 Microchip Technology Inc.
and its subsidiaries
Manual
DS00004572A-page 37
