Connecting System Ground
Cisco 12008 Gigabit Switch Router Installation and Configuration Guide
3-38
Table3-10 DB-25 Connector Pinout Assignments
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.
Figure3-18 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 Figure2-6).
Pin Group Common Normally
Open Normally
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