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    External Clocking Ports Specifications on the ACX4000 Router

    Two sets of clocking ports allow you to connect the ACX4000 router to external clocking devices.

    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 1 provides the pinout information for the RJ-48 connector for the external clocking input port.

    Table 1: External Clocking Input Port Connector Pinouts

    Pin

    Description

    Direction

    1

    EXT_CLKA_RRING_LINE

    Input

    2

    EXT_CLKA_RTIP_LINE

    Input

    3

    Reserved

    4

    EXT_CLKA_TRING_LINE

    Output

    5

    EXT_CLKA_TTIP_LINE

    Output

    6

    Reserved

    7

    Reserved

    8

    Reserved

    Published: 2013-04-04