GBICs
support UTP (copper) and ?¬?ber-optic media for Gigabit Ethernet transmission.
Figure 1-99 Connection Types
Figure 1-100 1000Base-T GBIC
Typically, GBICs are used in the LAN for uplinks and are normally used for the backbone.
GBICs are also seen in remote networks.
The ?¬?ber-optic GBIC, shown in Figure 1-101, is a transceiver that converts serial electric
currents to optical signals and converts optical signals to digital electric currents.
Fiber Connector Port
Tx Rx
ISO 8877 (RJ-45)
connectors and jacks
are slightly larger than
RJ-11 phone
connectors and jacks.
AUI connectors
are DB-15. 2E
2W
W1
STP
ETHERNET 1 ETHERNET 0
AU
EN
WC
STATUS
100 Mbps
Link
100 Mbps
Link
1
2
H5796
10/1000 Mbps FAST ETHERNET SWITCHING MODULE
RJ-45
Connector
Plastic Tab
118 Chapter 1: Building a Simple Network
Figure 1-101 Fiber GBIC
Optical GBICs include these types:
?– Short wavelength (1000BASE-SX)
?– Long wavelength/long haul (1000BASE-LX/LH)
?– Extended distance (1000BASE-ZX)
Unshielded Twisted-Pair Cable
Twisted-pair is a copper wire??“based cable that can be either shielded or unshielded. UTP
cable is frequently used in LANs. Figure 1-102 shows an example of a UTP cable.
Figure 1-102 UTP Cable
UTP cable is a four-pair wire.
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