Cisco Systems Network Device 2800 Installationshandbuch Seite 81
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7
Cable Connection Procedures for Cisco 2800 Series Routers
OL-5787-02
Power Connections
In Figure 4, either the positive source terminal or the negative source terminal is tied to ground.
Figure 4 Connecting to One Source Only—Source A or Source B
In Figure 5, source A and source B share common negative terminal connections.
Figure 5 Connecting Source A and Source B with Common Negative Terminals
In Figure 6, 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.
Note When source A and source B are wired with common negative terminals, as in Figure 5, discharging does
not occur and there is no restriction requiring that source A and source B voltages be equal.
A-
127037
A+
B+
B-
+
A-
A+
B+
B-
+
A-
127039
A+
B+
B-
Va
Vb
+
+
- Introduction and Warnings 1
- Audience 2
- Conventions 3
- Safety Warnings 4
- Avvertenza 5
- Advarsel 5
- ¡Advertencia! 5
- Varning! 6
- Safety Warnings 8
- Related Documentation 9
- OL-5808-01 10
- Obtaining Documentation 11
- Documentation Feedback 12
- Submitting a Service Request 13
- Hardware Features 18
- OL-5783-01 19
- Hardware Features 19
- Built-in Interfaces 20
- LED Indicators 23
- Chassis Views 26
- 7 9 11 12 13 14 14 27
- Cisco 2811 Chassis 28
- Chassis Views 29
- 1457 6 3 30
- 6 4 3 75 31
- Interface Numbering 32
- Specifications 34
- Specifications 35
- Regulatory Compliance 41
- Regulatory Compliance 42
- Safety with Electricity 44
- General Site Requirements 45
- Site Environment 46
- Site Configuration 47
- Equipment Racks 47
- Installation Checklist 48
- Creating a Site Log 49
- Inspecting the Router 49
- OL-5784-01 51
- Console Port Connections 53
- Auxiliary Port Connections 54
- Ethernet Connections 55
- Serial Connections 55
- Signaling Standards Supported 56
- Distance Limitations 56
- ISDN BRI Connections 57
- CSU/DSU Connections 58
- Series Routers 59
- For HWICs and VICs: 60
- For AIMs 62
- For PVDMs 62
- For Internal Power Supplies 62
- Setting Up the Chassis 63
- OL-5786-03 64
- Setting Up the Chassis 64
- Use four screws on each side 65
- Chassis Grounding 68
- Statement 248 69
- Ring terminal 72
- Ground lug 72
- Routers” online document 73
- Power Connections 76
- DC Wiring Requirements 77
- Wiring Procedure for DC Input 78
- Statement 117 79
- 2800 Routers 80
- OL-5787-02 81
- Power Connections 81
- Ports and Cabling 84
- Checklist for Power Up 89
- Power Up Procedure 90
- Configuring the Router 92
- Completing the Configuration 97
- OL-5788-01 98
- Configuring the Router 98
- Normal Indications 100
- Fault Indications 100
- OL-5789-01 101
- Solving Problems 101
- Reading System LEDs 102
- • Router fault 103
- Reading Port and Module LEDs 104
- System Messages 105
- Recovering a Lost Password 109
- Corporate Headquarters: 113
- OL-5790-01 114
- 1 Filler panel 117
- 1 Slot divider 3 Filler panel 117
- 2 Blank panel 117
- Related Product Documentation 119
- OL-5791-01 122
- Slot divider flush 125
- Figure 7 Typical Blank Panel 126
- Cisco 2800 Series Routers 129
- Removing the Chassis Cover 130
- OL-5792-04 131
- Removing the Chassis Cover 131
- Statement 1003 132
- Statement 1041 132
- Screwdriver must not 133
- Plastic bezel 134
- Approx. 1 inch 134
- Locating Modules 137
- 3 PVDMs 7 Fans 138
- 4 Power supply 138
- 2 DRAM DIMMs 5 Fans 139
- Removing a DRAM DIMM 141
- Installing and Removing AIMs 144
- Software Requirement for AIMs 145
- AIM Location 145
- Removing an AIM 145
- Accessory Kit to Use 146
- Installation Procedure 146
- Metal standoffs 147
- Locking end 148
- Applying the AIM Label 154
- Verifying AIM Installation 155
- Installing and Removing PVDMs 156
- PVDM Location and Orientation 157
- Removing a PVDM 157
- Installing a PVDM 158
- Replacing the Power Supply 159
- Replacing the Power Supply 160
- 1 Power supply 3 Ribbon Cable 163
- 2 Retention screw location 163
- Cover” section on page 51 165
- Installing an ILP Supply 168
- Power supply 172
- 1 Primary power connector 173
- Installing the Chassis Cover 179
- OL-5793-01 184
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