A special box in the communications room to which the demarc extension attaches

Cable organizing device that adheres to walls, making for a much simpler, though less neat, installation than running cables in the walls.

The unique height measurement used with equipment racks

A fiber-optic testing device that determines continuity and indicates the location of a break

A contiguous chunk of IP addresses passed out by the Internet Assigned Numbers Authority (IANA)

Devices that monitor humidity, temperature, and other environmental factors in a telecommunications room

A central location for computer or telephone equipment and, most importantly, centralized cabling.

The set of standards established by the EIA/TIA regarding network cabling

Crosstalk (signals crossing from one pair of wires to another pair of wires) that is detectable on the same end of the cable from which the signals originated

Shorthand method for discussing and configuring binary IP addresses.

Crosstalk (signals crossing from one pair of wires to another pair of wires) that is detectable on the opposite end of the cable (the far end) from where the signal originated.

A device that tracks voltage over time by plugging into a power outlet

A network interface unit (NIU) that has additional intelligence that the ISP or telephone company can use to determine if the customer has disconnected from the NIU. Allows the ISP or telephone company to set up a remote loopback for testing purposes

An LED light on a NIC that tells you the NIC is connected to a hub or switch

Method of sending a packet in which the sending computer sends the packet to a group of interested computers

The room in a building that stores the demarc, telephone cross-connects, and LAN cross-connects

The main patch panel in a building. The demarc extension connects directly to this panel, which in turn leads to every telecommunications room in the building

A tool used when connecting a cable to a patch panel

The room where all the horizontal runs from all the work areas on a given floor in a building come together

A list of paths to various networks required by routers. You can build this table either manually or automatically

A DSL or cable modem that serves as a demarc (see demarc), usually between a private home and an ISP

The structured cabling name for the end user’s office space where network computers will be set up

Short (2' to 5') stranded UTP cables that connect patch panels to hubs

A device that tests the continuity of cables

Taking a single class of IP addresses and chopping it into multiple smaller groups