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Please specify your question about CTRL CARD PRI APS The PRI APS Control Card in combination with the I/F CARD PRI APS (90-6345-02) and E1/T1 PRI APS SHELF (90-6344-01) provides N:1 Automatic Protection Switching support for T1/E1 CE Cards on the 36170. Each T1/E1 Card serving as a protect *