Cisco Systems 78-11450-03 G, H, I

Glossary

GL-6

Cisco uBR10012 Universal Broadband Router Hardware Installation Guide

78-11450-03 Rev.B0

Frame Relay Industry-standard, switched data link layer protocol that handles multiple virtual circuits using HDLC

encapsulation between connected devices. Frame Relay is more efficient than X.25, the protocol for

which it is generally considered a replacement.

FRU Field replaceable unit. A component that can be removed from a network device and replaced in the

field. Line cards, power modules, and fan modules are typically FRUs.

GBIC Gigabit Ethernet converter. An interface module used by gigabit Ethernet and Fibre Channel to convert

the serial electrical signals to the transmission medium’s physical layer signalling, which is typically

optical. GBIC modules can be hot-swapped and contain ID and system information that a switch or

router can use to determine the network device's capabilities. Different GBICs handle different types

of fiber cable. See 1000BASE-LX/LH, 1000BASE-SX, and 1000BASE-ZX.

Gigabit Ethernet Gigabit Ethernet. Ethernet running at a transmission speed of 1 billion bits per second.

Gigabit Interface

Converter

See GBIC.

HHGE half-height gigabit Ethernet

Hot swapping Feature that permits the addition, replacement, or removal of cards without interrupting the system

power, entering console commands, or causing other software or interfaces to shut down. Sometimes

called online insertion and removal (OIR).

IEEE Institute of Electrical and Electronics Engineers. Professional organization whose activities include the

development of communications and network standards. IEEE LAN standards are the currently

predominant LAN standards.

IEEE 802.3 IEEE LAN protocol that specifies an implementation of the physical layer and the MAC sublayer of

the data link layer. IEEE 802.3 uses CSMA/CD access at a variety of speeds over a variety of physical

media. Extensions to the IEEE 802.3 standard specify implementations for Fast Ethernet and gigabit

Ethernet.

Institute of Electrical

and Electronics

Engineers

See IEEE.

Intermediate reach See IR.

Internet service

provider

See ISP.