Appendix B Maintaining the WAVE-594 and WAVE-694
Using Power Protection Devices
Power Source Interruptions
Systems are especially sensitive to variations in voltage supplied by the AC power source. Overvoltage, undervoltage, and transients (or spikes) can erase data from memory or even cause components to fail.
To protect against these types of problems, power cables should always be properly grounded and one or both of the following methods should be used:
• Use one of the power protection devices described in
Using Power Protection Devices .
• Place the system on a dedicated power circuit (rather than sharing a circuit with other heavy electrical equipment). In general, do not allow the system to share a circuit with any of the following:
– Copier machines
–
–
–
–
–
–
–
–
Air conditioners
Vacuum cleaners
Space heaters
Power tools
Teletype machines
Adding machines
Laser printers
Facsimile machines
– Any other motorized equipment
Besides these appliances, the greatest threats to a system’s supply of power are surges or blackouts caused by electrical storms. Whenever possible, turn off the system and any peripherals and unplug them from their power sources during thunderstorms.
If a blackout occurs—even a temporary one—while the system is turned on, turn off the system immediately and disconnect it from the electrical outlet. Leaving the system on may cause problems when the power is restored; all other appliances left on in the area can create large voltage spikes that can damage the system.
Using Power Protection Devices
A number of devices are available that protect against power problems such as power surges, transients, and power failures. The following subsections describe some of these devices:
•
Surge Protectors
•
•
Line Conditioners
Uninterruptible Power Supplies
Surge Protectors
Surge protectors are available in a variety of types and usually provide a level of protection commensurate with the cost of the device. Surge protectors prevent voltage spikes, such as those caused during an electrical storm, from entering a system through the electrical outlet. Surge protectors, however, do not offer protection against brownouts, which occur when the voltage drops more than
20 percent below the normal AC line voltage level.
Cisco Wide Area Virtualization Engine 594 and 694 Hardware Installation Guide
B-5
Appendix B Maintaining the WAVE-594 and WAVE-694
Using Power Protection Devices
Line Conditioners
Line conditioners go beyond the overvoltage protection of surge protectors. Line conditioners keep a system’s AC power source voltage at a fairly constant level and therefore can handle brownouts. Because of this added protection, line conditioners cost more than surge protectors—up to several hundred dollars. However, these devices cannot protect against a complete loss of power.
Uninterruptible Power Supplies
Uninterruptible power supply (UPS) systems offer the most complete protection against variations in power because they use battery power to keep the system running when AC power is lost. The battery is charged by the AC power while it is available, so once AC power is lost, the battery can provide power to the system for a limited amount of time—from 15 minutes to an hour or so—depending on the UPS system.
UPS systems range in price from a few hundred dollars to several thousand dollars, with the more expensive units allowing you to run larger systems for a longer period of time when AC power is lost.
UPS systems that provide only 5 minutes of battery power let you conduct an orderly shutdown of the system but are not intended to provide continued operation. Surge protectors should be used with all UPS systems, and the UPS system should be Underwriters Laboratories (UL) safety-approved.
B-6
Cisco Wide Area Virtualization Engine 594 and 694 Hardware Installation Guide
I N D E X
A
AC power specifications
A-2
altitude guidelines
B-2
C cabling requirements inline network adapter
5-8
inline network adapter (examples)
5-10
connections power
3-8
troubleshooting
6-2
connectors and ports
Interface Module
5-5, 5-6, 5-7
locations 1-5
console port
1-6
corrosion preventing damage
B-3
cover
removing 4-6
D
DC power
installation precautions 2-5
drives
installing 4-3
dust preventing damage
B-3
E electromagnetic interference
See EMI
electrostatic discharge
See ESD
EMI preventing effects of
B-4
environment maintaining
B-1
ESD preventing damage
2-5, B-3
Ethernet controller troubleshooting
6-2
troubleshooting (chart)
6-3
Ethernet port
connector pinouts 1-6
F front panel figure
1-2
LEDs
1-3
H hard disk drive installing
4-3
problems
6-6
hardware troubleshooting
6-1
hardware option problems
6-7
Cisco Wide Area Virtualization Engine 594 and 694 Hardware Installation Guide
IN-1
Index humidity maintenance guidelines
B-2
I
I/O connectors
1-5
inline network adapter cabling examples
5-10
cabling requirements
5-8
installation warnings
2-1
installing
drives 4-3
Interface Module description
5-1
specifications
A-3
intermittent problems troubleshooting
6-7
L
LEDs checking
3-8
description
1-3, 1-4
front panel (table)
1-3
front view
1-2, 1-4
Interface Module
5-5, 5-6, 5-7
line conditioners using
B-6
M magnetism preventing effects of
B-4
maintenance
B-1 to B-5
memory problems
6-7
N network
connection problems 6-3
removing WAVE from
3-9
P ports
Interface Module
5-5, 5-6, 5-7
serial
1-6
power connecting to system
3-8
problems
6-8
power source interruptions
preventing damage from B-5
power supplies using uninterruptible
B-6
problem solving overview
6-1
tips
6-5
R radio frequency interference
See RFI
removing or replacing WAVE
3-9
RFI preventing effects of
B-4
S safety general precautions 2-4 warnings
2-1
serial port description
1-6
problems
6-8
IN-2
Cisco Wide Area Virtualization Engine 594 and 694 Hardware Installation Guide
Index shock preventing damage
B-4
site environment maintenance factors
B-1
solid state drive
4-2
surge protectors using
B-6
switches troubleshooting
6-2
system problems identifying
6-1
system reliability
2-5
T temperature maintenance guidelines
B-2
troubleshooting
connections 6-2
Ethernet controller
6-2
network connections
6-3
switches
6-2
system hardware
6-1
undetermined problems
6-4
U undetermined problems troubleshooting
6-4
uninterruptible power supplies using
B-6
V vibration preventing damage
B-4
W warnings installation
2-1
WAVE installing
3-2
maintaining
B-1
removing or replacing 3-9
Cisco Wide Area Virtualization Engine 594 and 694 Hardware Installation Guide
IN-3
Index
IN-4
Cisco Wide Area Virtualization Engine 594 and 694 Hardware Installation Guide
