Cisco Systems Cisco 12008 manual Connecting System Ground

Connecting System Ground

Table 3-10	DB-25 Connector Pinout Assignments
			Normally	Normally
Pin Group		Common	Open	Closed
Critical audible alarm		2	1	14
Major audible alarm		16	3	15
Minor audible alarm		5	4	17
Critical visible alarm		19	6	18
Major visible alarm		8	7	20
Minor visible alarm		22	9	21
Alarm input		13	25

Note Only safety extra-low voltage (SELV) circuits can be connected to the DB-25 connector. The maximum current rating for the DB-25 connector is 1A at 60 VDC.

Connecting System Ground

This section presents the procedures for connecting the Cisco 12008 to earth ground. It is strongly recommended that you complete this procedure before connecting system power or turning on your router.

Figure 3-18 shows the location of the grounding holes on the side panel of the router. Matching holes appear in the opposite side panel, enabling you to attach the grounding cable to either one side of the router or the other, but not both.

To ensure that the system grounding connection is adequate, you need the following parts and tools:

•Two 2-hole grounding lugs—These grounding lugs must have two M6 (metric) screw holes centered 0.625-inch to 0.75-inch apart and have a wire receptacle large enough to accommodate the recommended 4-AWG, multistrand, copper wire.

The grounding lugs can be similar to the terminals used with the source DC power cables for the DC-input power supply (see Figure 2-6).

3-38Cisco 12008 Gigabit Switch Router Installation and Configuration Guide