Acx4000 Clocking Ports Overview - Juniper ACX4000 Hardware Manual

50
Figure 8 on page 50 shows an example of a wiring diagram for a simple input alarm-reporting device. In
this case the push button switch is an alarm sensor that triggers an input alarm when a door-open
condition occurs.
Figure 8: Sample Input Alarm-Reporting Device
SEE ALSO
Alarm Contact Port Pinouts for ACX4000 Routers | 87

ACX4000 Clocking Ports Overview

The clocking ports acquire the clock source and synchronize communication over time-division
multiplexing (TDM) interfaces in the router. The clocking ports distribute a synchronized clock signal
throughout the router by locking onto a clock signal originating from an internal clock source or by
connecting to an external clock source.
The reference clock inputs can be T1/E1 line clocks, Ethernet recovered clocks, IEEE 1588v2 recovered
clocks, or xDSL NTU-R timing. Externally available reference clocks are BITS T1/E1 rate clocks, 1 pulse
per second (PPS), and 10 MHz. The four SubMiniature B (SMB) connectors on the front panel of the
router connect to external clock signal sources. The clocking ports provide the synchronized output
clocks from any one of the above reference inputs based on the clock's priority.
Internal clock sources within the ACX4000 router include:
• Four alarm inputs and four alarm output contacts