Glossary

The signal that a touch-tone phone generates when you press a key on it. Each key generates two separate tones, one in a high-frequency group of tones and one from a low-frequency group of tones.

An optical fiber cable manufactured to be used at two different wavelengths. Single-mode fiber cable that is usable at 1300nm and 1550nm is dual-window fiber. Multimode fiber cable is optimized for 850nm and 1300nm operations and is also dual-window fiber. Also known as double-window fiber.

(1) A single enclosed raceway for wires or cable. (2) An enclosure in which air is moved.

(1) A link or circuit that can carry a signal in two directions for transmitting and receiving data. (2) An optical fiber cable or cord carrying two fibers.

 

(2) Duplex Leads – Also known as shotgun or dual

A double loom, two lengths of cable run together to simultaneously send (TX) and receive (RX) data.
If you have a communications line that lets you send and receive data (or talk and listen) at the same time, it's duplex. If you use a cheap speakerphone, you'll notice that as soon as it picks up any noise at your end, it cuts off whatever was being said by the person on the other end. That speakerphone is not duplex.

A two-fiber cable suitable for duplex transmission. Usually two fiber strands surrounded by a common jacket.

Data transmission in both directions, either one direction at a time (half duplex) or both directions simultaneously (full duplex).

With respect to a digital transmission, the product of a signal

Loads, such as tension or pressure, that change over time, usually within a short period.

The difference between the maximum and minimum optical input power that an optical receiver can accept.

The European version of T-1 data circuits. Runs at 2.048Mbps.

The European version of T-3 data circuits. Runs at 34.368Mbps.

A term for zero reference ground (not to mention the planet most of us live on).

An LED that produces light through an etched opening in the edge of the LED.

Everything Everywhere joint venture between Deutsche Telecom (T-Mobile UK) and France Telecom (Orange UK)

The bandwidth of a particular optical fiber cable, connections and splices, and transmitter combination. This can be measured in a complete channel.