Cisco 4948 - Catalyst Switch Installation Guide Page 35
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Catalyst 4948E and Catalyst 4948E-F Switch Installation Guide
OL-21561-02
Chapter 2 Preparing for Installation
Power Source Interruptions
If the wires exceed the recommended distances, or if wires pass between buildings, give special
consideration to the effect of a lightning strike in your vicinity. The electromagnetic pulse caused by
lightning or other high-energy phenomena can easily couple enough energy into unshielded conductors
to destroy electronic devices. If you previously have had similar problems, you might want to consult
experts in electrical surge suppression and shielding.
Shock and Vibration
Catalyst 4948E and Catalyst 4948E-F switches have been shock- and vibration-tested for operating
ranges, handling, and earthquake standards to NEBS (Zone 4 per GR-63-Core). These tests have been
conducted in earthquake environment and criteria, office vibration and criteria, transportation vibration
and criteria, and packaged equipment shock.
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. Also,
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:
• Copy machines
• Air conditioners
• Vacuum cleaners
• Space heaters
• Power tools
• Teletype machines
• Laser printers
• Facsimile machines
• Any other motorized equipment
Besides these appliances, the greatest threats to a system power supply are surges or blackouts that are
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.
System Grounding
You must install a NEBS-compliant system ground as part of the chassis installation process. Chassis
installations that rely only on the AC third-prong ground are insufficient to properly and adequately
ground the systems. Both chassis comes with a ground lug and two M4 bolts as part of the accessory kit.
The lug attaches to the chassis grounding pad with the two bolts. A 6
AWG copper wire (not provided)
must be used to connect the ground lug to the NEBS-compliant building ground.
- Switch Installation Guide 1
- CONTENTS 3
- Contents 4
- Audience 9
- Organization 9
- Related Documentation 10
- Command Syntax Conventions 10
- Attention 12
- Avvertenza 12
- Advarsel 12
- ¡Advertencia! 13
- Varning! 13
- Product Overview 17
- (Catalyst 18
- 4948E Switch Shown) 18
- Features 19
- Features 20
- Fan Tray 24
- Fan Tray 25
- Front Panel LEDs 27
- Front Panel LEDs 28
- Preparing for Installation 29
- Site Requirements 30
- Temperature 31
- Air Flow 32
- Humidity 33
- Altitude 33
- Dust and Particulates 33
- Corrosion 34
- Power Source Interruptions 35
- System Grounding 35
- System Grounding 36
- Power Requirements 39
- Power Requirements 40
- Cabling Requirements 41
- Site Preparation Checklist 41
- Installing the Switch 43
- Warnings 44
- Verifying Package Contents 46
- Required Tools 46
- Rack-Mounting the Chassis 47
- Rack-Mounting the Chassis 48
- Duct Kit 51
- Installing the System Ground 52
- 3 System ground wire 53
- Statement 1019 54
- • Ground 57
- • (–) negative 57
- • (+) positive 57
- Powering Up the Switch 63
- Powering Up the Switch 64
- Statement 1030 65
- Removing the Fan Tray 74
- Installing the Fan Tray 75
- Power Supply Specifications 77
- 3 AC power cord receptacle 78
- Plug: CEI 23-16/7 86
- Cordset rating: 10 A, 250 V 86
- Length: 8 ft 2 in. (2.5 m) 86
- Connector: IEC 60320 C15 86
- Connector: 86
- Plug: BS 1363 87
- Adapter Specifications 91
- Receive optical bore 92
- Transmit optical bore 92
- Bail clasp 92
- Dust plug 92
- CWDM SFP Transceivers 95
- DWDM SFP Transceivers 97
- 10-GB SFP+ Transceivers 99
- OL-21561-02 100
- Console Port 101
- Ethernet Management Port 102
- Cables and Adapters 102
- Pin 1 and pin 8 103
- Cables and Adapters 104
- APPENDIX 105
- Getting Started 106
- Identifying Startup Problems 106
- LED Readings 107
- Contacting Customer Service 108
- Translated Safety Warnings 110
- Translated Safety Warnings 111
- Waarschuwing 113
- Varoitus 113
- 2006/95/EC and 2004/108/EC 151
- Numerics 157
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