Nortel 5500 series, Руководство по установке

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16 Installing the Nortel Ethernet Routing Switch
Phone Dongle Part Number
The part number for the Nortel Ethernet Routing Switch 5520
(5520-24T/48T-PWR) universal phone dongle is DY4311046
Electrostatic discharge
This section provides information and procedures for the prevention of
electrostatic discharge during the installation process.
Preventing electrostatic discharge damage
Electrostatic discharge (ESD) is a discharge of stored static electricity that
can damage equipment and impair electrical circuitry. These electrostatic
voltages can result from friction, including, but not exclusive to, pulling
cabling through conduits, walking across carpeted areas, and building up of
static charge in clothing. ESD damage occurs when electronic components
are improperly handled and can result in complete or intermittent failures.
While networking equipment is commonly designed and tested to withstand
common mode ESD events, voltage sometimes can be discharged to some
connector pins but not others, or to some pins before others, which has the
potential to damage the networking equipment.
To protect the Nortel Ethernet Routing Switch against ESD damage, take
the following preventive measures before connecting any data cables to
the device:
• Always use anti-static wrist straps. Make sure the strap is adjusted to
provide good skin contact.
• Ensure that work surfaces and equipment racks are properly grounded
for protection against electrostatic discharge. The common point must
be connected to the building ground wire. In a properly wired building,
the nearest reliable ground is typically at the electrical outlet.
• Avoid contact between equipment and clothing. The wrist or ankle
strap only protects the equipment from ESD voltages on the body; ESD
voltages on clothing can still cause damage.
• Avoid touching any connector pins.
• Do not remove the wrist or ankle strap until the installation is complete.
Preventing electrostatic damage in new cable installations
With new cable installations, Nortel recommends that the use of an ESD
discharge cable to reduce the potential for damage from static that can build
up in cables. An example of such a cable is illustrated below.
Nortel Ethernet Routing Switch 5500 Series
Installation
NN47200-300 2.00 Standard
5.0 7 July 2006
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