Juniper EX9253, Hardware Manual, Page: 103 / 251

Connecting the EX9253 Switch to External Clocking and Timing Devices
IN THIS SECTION
Connecting 1-PPS and 10-MHz Timing Devices to the Switch | 94
Connecting a BITS External Clocking Device to the Switch | 95
The switch supports external clock synchronization for Synchronous Ethernet and external inputs. The
connections to the switch are made through the ports on the front panel.
Figure 37 on page 94 shows
the ports that are used to connect the switch to external clocking and timing devices.
Figure 37: Ports Used to Connect the Switch to External Clocking and Timing Devices
1
—
Time-of-day (ToD) port with LED. Support for
this port is not available in this release. 3
—
10-MHz input and output timing ports
2
—
BITS ports with LEDs 4
—
1-PPS input and output timing ports
Connecting 1-PPS and 10-MHz Timing Devices to the Switch
The switch has four SubMiniature B (SMB) connectors that support 1-PPS and 10-MHz timing devices
(see
Figure 37 on page 94 ).
NOTE: Ensure that a cable of 3 m or less in length is used for the 10-MHz and 1-PPS connectors.
To connect the SMB coaxial cable to the external clocking input port:
1. Connect one end of the SMB coaxial cable to either the socket labeled IN on the 1-PPS SMB
connector or the 10-MHz SMB connector on the switch.
2. Connect the other end of the SMB coaxial cable to the 1-PPS or 10-MHz source network equipment.
94