Juniper ACX2000, Hardware Manual

Page: 90 / 190

External Clocking Port Connector Specifications
The external clocking port on the router contains four SMB connectors that support 10 MHz GPS and 1
pulse-per-second (PPS) signals. These signals can also be accessed through the External Clocking Input
port. These signals are internally isolated and have surge protection. Use a Molex 50-ohm SMB connector
or equivalent (not provided) to connect to the external clocking ports.
External Clocking Input Port Specifications
An external clocking input port labeled EXT REF CLK IN on the front panel of the router allows you to
connect external clock signal sources.
The port uses an autosensing RJ-48 connector to support framed T1 or E1 signals. Two LEDs indicate link
activity on the port and function in the same way as the T1/E1 ports. The clocking information is extracted
from the input, but the data is discarded.
Table 32 on page 90 provides the pinout information for the RJ-48 connector for the external clocking
input port.
Table 32: External Clocking Input Port Connector Pinouts
Direction Description Pin
Input EXT_CLKA_RRING_LINE 1
Input EXT_CLKA_RTIP_LINE 2
– Reserved 3
Output EXT_CLKA_TRING_LINE 4
Output EXT_CLKA_TTIP_LINE 5
– Reserved 6
– Reserved 7
– Reserved 8
SEE ALSO
Clocking Ports on the ACX2000 and the ACX2100 Router | 56
ACX2000 and ACX2100 Universal Metro Router Overview | 17
90