Glossary

A B C D E F G I L M N O P Q R S T U V W
ADSL (Asymmetric Digital Subscriber Line)

A modulation method for transferring data on the analog two-wire copper line that has been used to date only as a simple telephone line for connecting an analog phone. This method has been specially adapted to the needs of Internet use, in which a small quantity of data (query command) with low speed (upload) is required for the query, whereas a large quantity of data (files) has to be transferred at high speed (download) for the response.

Assembling fiber optic cables

Fiber optic cables are connected to one another by various methods using connectors and linked via couplings so that the light signal is transported with as far as possible none of the signal being lost. This creates optical fiber assemblies that are pre-assembled at the factory, are suitable for mounting, have the right length and the right connectors for the network components to be connected and that are supplied directly to the construction site or as a spare part for storage along with the associated measurement protocol.

Attenuation

A characteristic feature of lines or coupling points – fi ber optic or copper – that indicates their quality: Attenuation describes the losses on the route (the signal’s strength at the end of the cable compared with when it was fed in). It is specifi ed in dB/km or dB.