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    Redundant SCGs Overview

    Inspect redundant SCGs to ensure that they provide a clock signal for the SONET/SDH interfaces on the router and that they select a clock signal from any FPC, or from the external clock inputs.

    Two SCGs are installed in the T320 router and the T640 router. The SCGs install into the upper rear of the chassis in the slots labeled SCG0 and SCG1.

    If both SCGs are installed and functioning normally, SCG0 is master and SCG1 is backup. Removing the backup SCG does not affect the functioning of the router. Taking the master SCG offline can result in a brief loss of SONET clock lock while the backup SCG becomes master.

    The SCGs are hot-pluggable.

    Figure 1 shows the location of the SCGs on the T320 router, T640 router, and T1600 router.

    Figure 1: T320 Router T640 Router, and T1600 Redundant SCG Location

    T320 Router T640
Router, and T1600 Redundant SCG Location

    Published: 2012-08-20