Cisco 2821 - Integrated Services Router Unified Communications Bundle Panduan Memulai Cepat - Halaman 21
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Connecting the Router to DC Power
If your router has a DC-input power supply, follow the directions in this section for proper wiring. If backup power is required,
see the "Connecting the Router to Backup Power" section on page 26.
Cisco 2801 routers are not designed to connect to DC power.
Note
DC Wiring Requirements for Cisco 2800 Series Routers
DC return is isolated from the frame (NEBS DC-I).
Caution
Warning
This product requires short-circuit (overcurrent) protection, to be provided as part of the building installation.
Install only in accordance with national and local wiring regulations. Statement 1045
Warning
This product relies on the building's installation for short-circuit (overcurrent) protection. Ensure that the
protective device is rated not greater than:
60 VDC, 20 A. Statement 1005
Warning
Use copper conductors only. Statement 1025
Note
The DC-input power supply does not apply to Cisco 2801 router.
A Cisco 2800 series integrated services router with a DC-input power supply requires copper wire for the power connections.
Table 1 and Table 2 summarize the wiring requirements.
You can connect a single DC power source to either the A input or the B input. If there are dual power sources, connect one
source to the A input and one source to the B input. Both sources must be the same polarity and voltage.
Table 1
DC Wiring Requirements for Cisco 2811 Routers
DC Input
24–36 VDC, 8 A, positive or negative,
single source or dual sources
36–60 VDC, 5 A, positive or negative,
single source or dual sources
Table 2
DC Wiring Requirements for Cisco 2821 and Cisco 2851 Routers
DC Input
24–36 VDC, 12 A, positive or negative,
single source or dual sources
36–60 VDC, 8 A, positive or negative,
single source or dual sources
Safety Ground Wire
DC Input Wire Size
Size
2
AWG 14 (2.0 mm
) AWG 14 (2.0 mm
minimum
Safety Ground Wire
DC Input Wire Size
Size
2
AWG 14 (2.0 mm
) AWG 14 (2.0 mm
minimum
Wire Terminal (Lug)
2
),
Amp/Tyco No. 32957
or equivalent
Wire Terminal (Lug)
2
),
Amp/Tyco No. 32957
or equivalent
Overcurrent
Protection
20 A
maximum
Overcurrent
Protection
20 A
maximum
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