Connecting 1Pps And 10Mhz Timing Devices To The Router; Connecting A T1 Or E1 External Clocking Device To The Router - Juniper ACX1000 Hardware Manual

The ACX1000 and ACX1100 routers support external clock synchronization for Synchronous Ethernet,
T1 or E1 line timing sources, and external inputs.

Connecting 1PPS and 10MHz Timing Devices to the Router

The router has four SMB connectors that support 1PPS and 10MHz timing devices.
NOTE: Ensure a cable of 3m or less in length is used for the 10 MHz and 1PPS connectors.
To connect the SMB co-axial cable to the external clocking input port:
1. Connect one end of the SMB co-axial cable to either the 1PPS SMB connector or the 10 MHz SMB
connector on the router.
2. Connect the other end of the SMB co-axial cable to the 10 MHz or 1PPS source network equipment.
NOTE: Ensure that the 10MHz / 1PPS sources are 50 ohms LVCMOS / LVTTL (3.3v)
compatible.

Connecting a T1 or E1 External Clocking Device to the Router

The router contains an external building-integrated timing system (BITS) timing port labeled EXT REF
CLK IN on the front panel of the router. The external clock interface allows BITS or GPS clock source
input to the centralized timing circuit, or allows centralized timing to be output to BITS or GPS.
To connect the router to a BITS T1/E1 external clocking device:
1. Attach an electrostatic discharge (ESD) grounding trap on your bare wrist, and connect the strap to
one of the ESD points on the chassis.
2. Plug one end of the RJ-45 cable into the internal clock port on the craft interface.
3. Plug the other end of the RJ-45 cable into the T1 or E1 external clocking device.
4. Verify that the LEDs for the external clock input is lit steadily green.
5. Configure the port. See:
• "Initially Configuring the ACX1000 or ACX1100 Router" on page 112
• Configuring External Clock Synchronization for ACX Series Routers
6. Issue the
show chassis synchronization
user@host> show chassis synchronization
Clock Synchronization Status :
Clock module on CB 0
command to check the status of the port.
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