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CHAPTER 5: MAKING NETWORK CONNECTIONS
5.6 FIBER OPTIC SFP DEVICES
An optional Gigabit SFP transceiver can be used for a backbone connection between switches, or for connecting to a high-speed server.
Each single-mode fiber port requires 9/125 micron single-mode fiber optic cable with an LC connector at both ends. Each multimode
fiber optic port requires 50/125 or 62.5/125 micron multimode fiber optic cabling with an LC connector at both ends.
WARNING
: This switch uses lasers to transmit signals over fiber optic cable. The lasers are inherently eye-safe in normal operation.
However, user should never look directly at a transmit port when it is powered on.
WARNING
: When selecting a fiber SFP device, consider safety. Make sure that it can function at a temperature that is not less than the
recommended maximum operational temperature of the product. You must also use an approved Laser SFP transceiver.
STEP 1
: Remove and keep the LC port’s rubber plug. When not connected to a fiber cable, the rubber plug should be replaced to protect
the optics.
STEP 2
: Check that the fiber terminators are clean. You can clean the cable plugs by wiping them gently with a clean tissue or cotton ball
moistened with a little ethanol. Dirty fiber terminators on fiber optic cables will impair the quality of the light transmitted through the cable
and lead to degraded performance on the port.
STEP 3
: Connect one end of the cable to the LC port on the switch and the other end to the LC port on the other device. Since LC
connectors are keyed, the cable can be attached in only one orientation.
STEP 4
: As a connection is made, check the Link LED on the switch corresponding to the port to be sure that the connection is valid.
The fiber optic ports operate at 1 Gbps. The maximum length for fiber optic cable operating at Gigabit speed will depend on the fiber type
as listed under “1000 Mbps Gigabit Ethernet Collision Domain.”
5.7 CONNECTIVITY RULES
When adding hubs to your network, please note that because switches break up the path for connected devices into separate collision
domains, you should not include the switch or connected cabling in your calculations for cascade length involving other devices.
5.8 1000BASE-T CABLE REQUIREMENTS
All Category 5 UTP cables that are used for 100BASE-TX connections should also work for 1000BASE-T, providing that all four wire pairs
are connected. We recommend that for all critical connections, or any new cable installations, Category 5e or Category 6 cable should
be used. The Category 5e and 6 specifications include test parameters that are only recommendations for Category 5. The first step in
preparing existing Category 5 cabling for running 1000BASE-T is a simple test of the cable installation to be sure that it complies with the
IEEE 802.3-2005 standards.
5.9 1000-MBPS GIGABIT ETHERNET COLLISION DOMAIN
TABLE 5-1. MAXIMUM 1000BASE-T GIGABIT ETHERNET CABLE LENGTH
CABLE TYPE
MAXIMUM CABLE LENGTH
CONNECTOR
Category 5, 5e or 6 100-ohm UTP or STP
100.m (328 ft)
RJ-45
Power LED
Green
Lit when switch is powering up;
OFF when switch power is turned off
