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    T320 RJ-48 Connector Pinouts for the SCG EXTERNAL CLOCK INPUTS Ports

    The two inputs on the SCGs labeled EXTERNAL CLOCK INPUT are RJ-48 receptacles that accept RJ-48 cables for connecting the CB to 19.44-MHz Stratum 3 reference clocks. Table 1 describes the RJ-48 connector pinouts.

    Table 1: RJ-48 Connector Pinouts

    Pin

    Signal

    1

    EXT_RRING (negative input clock)

    2

    EXT_RTIP (positive input clock)

    3

    Shield ground

    4

    EXT_TRING (negative output signal—not a clock)

    5

    EXT_TTIP (positive output signal—not a clock)

    6

    Shield ground

    7

    Not used

    8

    Not used

    Published: 2011-07-27