Guidelines for particulate matter, Installation guidelines – Cisco 3750 User Manual
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Catalyst 3750 Metro Switch Hardware Installation Guide
OL-9160-02
Chapter 2 Switch Installation
Preparing for Installation
Warning
Installation of the equipment must comply with local and national electrical codes. Statement 1074
Caution
To comply with the Telcordia GR-1089 Network Equipment Building Systems (NEBS) standard for
electromagnetic compatibility and safety, connect the Ethernet cables only to intrabuilding or unexposed
wiring or cabling.
Note
For a list of EMC regulatory statements, see the Regulatory Compliance and Safety Information for the
Catalyst 3750 Metro Switch.
Guidelines for Particulate Matter
Cisco Ethernet Switches are equipped with cooling mechanisms, such as fans and blowers. However,
these fans and blowers can draw dust and other particles, causing contaminant buildup inside the chassis,
which can result in a system malfunction.
You must install this equipment in an environment as free as possible from dust and foreign conductive
material (such as metal flakes from construction activities).
These standard provide guidelines for acceptable working environments and acceptable levels of
suspended particulate matter:
•
Network Equipment Building Systems (NEBS) GR-63-CORE
•
National Electrical Manufacturers Association (NEMA) Type 1
•
International Electrotechnical Commission (IEC) IP-20
Installation Guidelines
When you determine where to place the switch, be sure to observe these restrictions:
•
When you connect cables from 10/100 ports and 1000BASE-T SFP module ports to other devices,
you can use cable lengths up to 328 feet (100 meters).
•
See
for a list of cable specifications for 1000BASE-SX, 1000BASE-LX,
1000BASE-BX, 1000BASE-ZX, and CWDM fiber-optic SFP module connections. Each port must
match the wave-length specifications on the other end of the cable, and for reliable communications,
the cable must not exceed the stipulated cable length.
Note
When you use shorter distances of single-mode fiber cable, you might need to insert an
inline optical attenuator in the link to avoid overloading the receiver.
When the fiber-optic cable span is less than 15.5 miles (25 km), you should insert a
5-decibel (dB) or 10-dB inline optical attenuator between the fiber-optic cable plant and the
receiving port on the 1000BASE-ZX SFP module at each end of the link.
•
Operating environment must be within the ranges listed in