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Alternative Routing
Route used for the transmission of information when the direct or primary routes are busy or faulty.

Access Service
Service provided by a PTO to allow its clients to access the services of another PTO interconnected to it.

Audible Signal
Sound signal related to a frequency that can be heard by a human being, approximately between 15 Hertz and 20.000 Hertz.

Audio Conferencing
Bidirectional system of voice communication, between several persons located in different places, through voice circuits and electronic equipment.

Adaptor
An appliance used to connect equipments, two parts of the same equipment or two devices that are not directly connectable due to incompatibilities in voltage, size, current or frequency. This may also be referred to as interface.

ADSL (Asymmetric Digital Subscriber Line)
A communications technology that enables asymmetric transmission of broadband using the existing copper telephone lines for data communication with high frequencies and access to multimedia services.

An ADSL circuit provides three channels of information: one channel of high downstream rate (1,5 Mbit/s), one duplex channel of high upstream rate (16 to 640 Kbit/s) and one channel for telephone service.

Alarm
A message or an optic or acoustic signal that warns of the existence of a problem.

Abandonment of Installations
Any installation which is not used for a period of more than 45 days is considered abandoned in case the client fails to notify Angola Telecom.

Access to Subscriber installations
According to legislation in force, Angola Telecom, through its duly authorized agents, has the right to access the premises of the subscriber installations to carry out inspection, maintenance, reparation or removal of the equipment.

Ampere
The base unit of an electrical current.

Amplitude
The maximum value that a changeable magnitude can reach.

Analogue
Referring to a continuously variable signal or wave, such as a sinusoid.

Antenna
A combination of conductors or other devices designed to pick up electromagnetic waves to and from space.

Aerial Cable
Telecommunication cable installed on telephone posts or the wall of a building.

Area Code
Digit or set of digits assigned to an area of the network, in order to allow access to the respective telephone network.

Access Operator
An Operator which allows the access to the services of another Operator,

Area code
A combination of one or more figures of the national number plan, which identifies an area of the territory in the country.

Access Point
Also called a secondary interconnection point, it is the interconnection point where cables in the feeding network (or of the secondary feeding network in a three-levelled structure) join with cables in the distribution network.