Across
- 3. Low-powered, two-way radio communication systems, such as those used in taxis, police radios, and other private radio systems; also called “single-frequency radio.”
- 8. (2 word) The location of workstations and other user devices—in short, the place where people work with computers and other network devices.
- 9. Stands for Intermediate Distribution Frame. A telecommunications closet that houses the cabling and devices for work area computers. See also telecommunications closet (TC) and work area.
- 13. IR. A very long-wavelength light source in the invisible spectrum that can be used to transmit data wirelessly.
- 14. Stands for Telecommunications Closet. Usually an enclosed space or room that provides connectivity to computer equipment in the nearby work area; it can also serve as the entrance facility in small installations. Typical equipment includes patch panels to terminate horizontal wiring runs and switches. When it houses the cabling and devices for work area computers, it’s called an “intermediate distribution frame.” See also intermediate distribution frame (IDF).
- 15. Hz. A unit expressing how many times per second a signal or electromagnetic wave occurs.
- 16. A device that transmits and receives. In wireless networking, an access point is a transceiver.
- 17. Representing 0s and 1s as a physical signal, such as electrical voltage or a light pulse; the method used to represent bits on a medium.
- 19. Stands for Twisted-Pair. A cable containing one or more pairs of insulated strands of copper wire twisted around one another and housed in an outer sheath.
- 20. Devices that use infrared signals to communicate. Stands for Infrared Device Association.
Down
- 1. A specification for organizing cabling in data and voice networks, regardless of the media type or network architecture.
- 2. Stands for MDI crossed devices. Network devices that connect by using RJ-45 plugs over twisted-pair cabling; they transmit over pins 3 and 6 and receive over pins 1 and 2 of an RJ-45 connector.
- 4. The attachment of RJ-45 plugs on a cable to make a patch cable, or punching down cable wires into terminal blocks on a jack or patch panel.
- 5. A grade of cable that’s not suitable for data networking but is suitable for voice communication.
- 6. Stands for Medium Dependent Interface. Network devices that connect by using RJ-45 plugs over twisted-pair cabling; they transmit on pins 1 and 2 and receive on pins 3 and 6 of an RJ-45 connector.
- 7. Stands for Main Distribution Frame. An equipment and cabling room that serves as the connecting point for backbone cabling between buildings and between IDFs; also called the “main cross-connect.” See also equipment room.
- 10. A grade of cable suitable for data networking.
- 11. Stands for Radio Frequency Interference. Similar to EMI, but is usually interference caused by strong broadcast sources. See also electromagnetic interference (EMI).
- 12. A short cable for connecting a computer to an RJ-45 jack or connecting a patch-panel port to a switch. See also straight-through cable.
- 18. Interference that one wire generates on another wire when both wires are in a bundle.