Juniper EX9251, Hardware Manual, Page: 113 / 217

Table 35: Clocking Port on an EX9251 Switch
Callout Label Description
4 and 5
(See Figure 48 on page 103 )
10MHz
1PPS
GPS input and output ports.
Connecting a Time-of-Day Device to the Switch
A time-of-day port labeled ToD, on the front panel of the switch enables you to connect external timing
devices.
To connect the switch to a ToD external timing device:
1. Wrap and fasten one end of the ESD wrist strap around your bare wrist, and connect the other end
of the strap to the ESD point on the switch.
2. Plug one end of an RJ-45 cable into the ToD port on the front panel of the switch.
3. Plug the other end of the RJ-45 cable into the ToD timing device.
4. Verify that the LEDs for the ToD port on the switch are lit steadily green.
5. Configure the port.
Table 36: Time-of-Day Port on an EX9251 Switch
Callout Label Description
3
(See Figure 48 on page 103 )
ToD ToD RJ-45 port with LED.
Connecting a BITS External Clocking Device to the Switch
The switch has an external building-integrated timing supply (BITS) port, labeled BITS, on the front panel
of the switch.
To connect the switch to a BITS external clocking device:
1. Wrap and fasten one end of the ESD wrist strap around your bare wrist, and connect the other end
of the strap to the ESD point on the switch.
2. Plug one end of an RJ-45 cable into the internal clock port on the front panel.
3. Plug the other end of the RJ-45 cable into the BITS external clocking device.
104