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Glossary of Terms

Satellite and Internet Glossary of Terms

Auto Sensing Network Switch: A piece of network hardware that acts as a central connection point in a residential or business LAN. It is preferable to use a switch versus a hub, because it increases capacity and decreases network loading by dividing a LAN into different segments, which don’t compete with each other for network transmission capacity. A switch acts as a selective bridge that automatically forwards traffic from one segment to another, without interference. In other words, a switch works better than a HUB.

10BaseT: 10 megabits per second of data transmitted over an unshielded, twisted pair of cable.

100BaseT: 100 megabits per second of data transmitted over an unshielded, twisted pair of cable.

Category 5 Cable (Cat 5): A cable that uses, solid core telephone wires, versus stranded, and includes 4 pairs (8 wires) of unshielded twisted wire. This is currently the most popular cable used in a 10/100 Ethernet based network. RJ45 connectors and Jack Modules are used on this cable.

Category 5e Cable (Cat 5e): Similar to Cat 5 cable, but is enhanced to support speeds of up to 1000 megabits per second.

Client: Any computer on a LAN, other than the Host Computer or a Server. A Client is the remote computer that shares the satellite connection with the Host computer.

Crossover Cable: This is also called a “Crossed Cable.” A Cat 5 or 5e cable that is used to connect one Personal Computer (PC) to another PC or one switch to another switch.

Ethernet: A method used to access a Local Area Network (LAN). Token Ring is another method, but not widely used. Ethernet can be used on a shared network, where all clients share the bandwidth or on a switched network where each sender and receiver pair have the full bandwidth. Ethernet uses a technology that broadcasts each frame onto a medium such as wire or fiber. All computers, on the network, are listening. The computer with the matching destination address, accepts the frame and checks for errors. Ethernet was invented in 1973 by Robert Metcalfe and David Boggs of Xerox. It ran at 2.93 megabits per second (Mbps).

Ethernet Cable: Any cable used to connect computers, hubs, switches, routers, etc. The most popular, for home use, is Cat 5 or Cat 5e.

10/100 Ethernet Card: A card that is installed in a computer to facilitate the connection to an Ethernet based LAN. It will support up to 100 megabits per second of data transmitted over a UTP cable. This is also called a Network Interface Card (NIC).

10/100 Ethernet Network: An Ethernet based network that supports both 10BaseT and 100BaseT speeds.

Fast Ethernet: An Ethernet Network that will support up to 100 megabits per second of data transfer.

Host Computer: The computer that is connected directly to your satellite ITU and IRU modems (also called adapters).

Local Area Network (LAN): Two or more computers, tied together in a network, usually confined to one building or a group of associated buildings.

Network Interface Card (NIC): A card that is installed in a computer that enables a computer to be connected to a LAN and communicate with other computers on that LAN. The 10/100 are currently the most popular.

Plenum Cable: Cable that has an outer sheath coated with Teflon as a fire retardant. It will not give off toxic fumes or smoke when burned. It will also accept a higher temperature then regular PVC coated cable. Plenum cable is usually used in the plenum space of a building which is between the actual ceiling and the drop ceiling.

Prefabricated Cat 5 or 5e Patch cable: A Cat 5 or 5e cable that is already fitted with the RJ45 connectors on the ends. Nine (9) feet is the maximum length, recommended for connecting between the switch and a RJ45 Jack Module, between the Host computer and the switch or between the RJ45 Jack Module and a Client computer. However, longer lengths may be used in a home environment, but the shorter, the better. This should be a “Straight Cable” versus a “Crossed Cable.”

110 Punch-Down Impact Tool: The proper tool used to install wires on the back of the RJ45 Jack Module. They are available from many sources on the Internet with prices as low as $15.00. 110 is the type of blade used for the RJ45 Jack Module which is a 110 type connecting block. (see figure 1)

RJ45 Connector: A connector for Cat 5 or Cat 5e cable, with 8 pins. It looks similar to a typical telephone wire connector that only has 4 or 6 pins, but it is larger in size.

RJ45 Jack Module: A module that fits into a wall plate for the purpose of connecting Cat 5 or Cat 5e cable to the back of it and plugging a RJ45 connector into the front of it.

Satellite USB Modem: Also called “Adapter,” Indoor Transmit Unit (ITU) and Indoor Receive Unit (IRU). The IRU is a USB hardware device that acts as an interface between your satellite antenna and your Host Computer.

USB Device (Universal Serial Bus): A computer related hardware interface device such as a modem, keyboard, joystick, scanner, printer, etc. USB has a maximum bandwidth of 12Mbps.

UTP Cable: Unshielded Twisted Pair of typical telephone cable.

Today is October 21st, 2014