Cisco 3845 Hardware Guide - Page 57

Connecting Routers to Backup Power

Get Cisco 3845 - Security Bundle Router PDF manuals and user guides
UPC - 746320981420
View all Cisco 3845 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 57 highlights

Power Connections Figure 19 Source A and Source B Wired with Opposite-Polarity Grounds AVa + A+ + B+ Vb B- 127041 Connecting Routers to Backup Power The Cisco 3845 router accommodates two hot-swappable power supplies in bays at the front of the router. A single power supply meets router requirements. The second power supply provides redundancy, load sharing, and increased router availability. Either power supply can be removed without affecting router operation. Any combination of two power supplies is permitted. For instructions for installing a second power supply in a Cisco 3845 router, see the "Installing and Upgrading Internal Components in Cisco 3800 Series Routers" section. The Cisco 3825 router has one internal power supply and provides a connector to an optional Cisco Redundant Power System (RPS) external backup source. Figure 20 and Figure 21 illustrate this connection. Use a flat-blade screwdriver to pry off the door over the RPS connector before connecting the cable. See the Cisco RPS-675 Hardware Installation Guide for complete RPS power connection instructions. Caution Before connecting the RPS to the router, make sure that either the RPS is in standby mode or the RPS AC power is disconnected. Connecting the RPS to AC power automatically places the RPS in active mode. OL-5970-02 Connecting Cables to Cisco 3800 Series Routers 27

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
  • 117
  • 118
  • 119
  • 120
  • 121
  • 122
  • 123
  • 124
  • 125
  • 126
  • 127
  • 128
  • 129
  • 130
  • 131
  • 132
  • 133
  • 134
  • 135
  • 136
  • 137
  • 138
Power Connections
27
Connecting Cables to Cisco 3800 Series Routers
OL-5970-02
Figure 19
Source A and Source B Wired with Opposite-Polarity Grounds
Connecting Routers to Backup Power
The Cisco 3845 router accommodates two hot-swappable power supplies in bays at the front of the
router. A single power supply meets router requirements. The second power supply provides
redundancy, load sharing, and increased router availability. Either power supply can be removed without
affecting router operation. Any combination of two power supplies is permitted.
For instructions for installing a second power supply in a Cisco 3845 router, see the “
Installing and
Upgrading Internal Components in Cisco 3800 Series Routers
” section.
The Cisco 3825 router has one internal power supply and provides a connector to an optional
Cisco Redundant Power System (RPS) external backup source.
Figure 20
and
Figure 21
illustrate this
connection. Use a flat-blade screwdriver to pry off the door over the RPS connector before connecting
the cable. See the
Cisco RPS-675 Hardware Installation Guide
for complete RPS power connection
instructions.
Caution
Before connecting the RPS to the router, make sure that either the RPS is in standby mode or the RPS
AC power is disconnected. Connecting the RPS to AC power automatically places the RPS in
active mode.
A-
127041
A+
B+
B-
Va
Vb
+
+
A-
A+
B+
B-
Va
Vb
+
+