Glossary G, H, I

GBIC  Gigabit Interface Connector. 

Gigabit Ethernet  A standard of Ethernet which supports a data transfer rate of 1 Gigabit (1000 Megabits per second). 

Gland  A device used to attach and secure the end of a cable to networking equipment. 

Global Address An IP address allowed to connect to the Internet. Global addresses are allocated by InterNIC ( in order to keep every global address unique.

GUI  Graphical User Interface such as a computer which allows users to interact with images rather than text commands. 

Half Duplex A sequential two-way transmission of data in which information can be transmitted in both direction but only in one direction at a time. See also Full Duplex. 

Hermaphroditic Also known as Genderless Connectors, which have simultaneous male and female aspects. 

Hot Swappable  The replacing, inserting or removing of system components occurs without the need to shut down the system. 

HSSDC  High Speed Serial Data Connector, a connector type that allows a higher level of bandwidth transmittal. 

Hub (Repeater Hub). A simple network device that resends incoming packets to all ports without checking addreses. Repeater hubs can be used to connect network segments together forming one big network. Repeater hub technology is obsolete and should never be used in new systems.

IEC International Electrotechnical Commission - an international standards committee responsible for putting in place standards for electrical and electronic technologies. 

IGMP Internet Group Management Protocol - used by routers and hosts on IP networks to establish multicast group memberships. 

IGMP Snooping  A switch function, allowing the device to listen to Internet Group Management Protocol messages. This means the switch can block multicast traffic from going to places it is not needed, thus freeing up network bandwidth. 

Infiniband  A form of input/output architecture used in higher-end clusters and networks to extend connections via external networks at a speed of 2.5Gbps in each direction. 

Insertion Loss  Loss of signal power following the insertion of any device. 

IP address Internet Protocol address, a user definable address to manage information streams on a network. The IP address includes a network number and a host number. It allows information to be routed on a local area network (office network, normally using IPv4 with 4 byte addressing) as well as a wide area network (the internet, normally using IPv6 with 4 byte addressing).

IP Rating  The IP Rating given to a piece of electrical apparatus is a two digit code indicating the degree of protection it's enclosure affords it. Read more here.

IPv4 - Internet Protocol Version 4. Read More on IPv4 at Wikipedia

IPv6 - Internet Protocol Version 6. Read More on IPv6 at Wikipedia

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