Cisco 2800 Series 빠른 시작 매뉴얼 - 페이지 24

{카테고리_이름} Cisco 2800 Series에 대한 빠른 시작 매뉴얼을 온라인으로 검색하거나 PDF를 다운로드하세요. Cisco 2800 Series 45 페이지. Cisco ios software configuration
Cisco 2800 Series에 대해서도 마찬가지입니다: 빠른 시작 매뉴얼 (13 페이지), 데이터시트 (8 페이지), 빠른 시작 매뉴얼 (47 페이지), 애플리케이션 노트 (41 페이지), 구성 (10 페이지), 개요 (27 페이지), 데이터시트 (5 페이지), 데이터시트 (20 페이지), 구성 (32 페이지)

페이지 인쇄

Approved Scenarios and Scenarios Not Approved for Dual DC Power Supply Configuration

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 (with respect to ground) and voltage

(within 0.25 volts). Do not connect –DC grounded and +DC grounded dual sources to Cisco 2811, Cisco 2821, and

Cisco 2851 series integrated services routers.

Caution

Dual sources with opposite-polarity grounding damage equipment.

In Figure 21, either the positive source terminal or the negative source terminal is tied to ground.

Figure 21

Connecting to One Source Only—Source A or Source B

A-

A+

B+

B-

In Figure 22, source A and source B share common negative terminal connections.

Figure 22

Connecting Source A and Source B with Common Negative Terminals

In Figure 23, source A and source B share common positive terminal connections. This is allowed only if Va equals Vb (within

0.25 V).

Caution

When connecting source A and source B with common positive terminals, if source A and source B voltages are

unequal by more than 0.25 V, the higher-voltage source can discharge into the lower-voltage source through the A-

and B- input terminals. Excessive discharging currents through these terminals can cause one or both of the dual

input DC power supply's internal A- or B- fuses to open, resulting in lack of redundancy or system failure. When

source A and source B are within 0.25 V, discharge current is minimal.

A-

A+

B+

B-

A-

A+

B+

B-