Cisco Systems Cisco uBR10012 manual GL-6

Glossary

Frame Relay

FRU

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.

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.

G

GBIC

Gigabit Ethernet

Gigabit Interface Converter

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

See GBIC.

H

HHGE

Hot swapping

Half-Height Gigabit Ethernet

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).

I

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			See IEEE.
and Electronics
Engineers
Intermediate reach			See IR.
Internet service			See ISP.
provider
		Cisco uBR10012 Universal Broadband Router Hardware Installation Guide
	GL-6		OL-18259-01