Subscriber Network, Client Network
The subscriber’s telephone installation consists of the subscriber’s network installation and the terminal equipment.

Switched Fixed Telephone Network
A switched public telecommunications network with fixed terminals.

Switched Fixed Telephone Service
Telephone service provided through a switched fixed telephone network.

Subscription Contract
Agreement signed between the subscriber and Angola Telecom, requiring proof of residence.

Significant Market Power
Market power considered by the Regulatory Body as having decisive influence on the conditions for competition.

Standard Quality of Service
The Quality of Service that a PTO should provide to its clients and interconnected PTOs in normal conditions, as an indicator of adequate quality.

Service Level
Probability that a certain proportion of the calls are lost in a system or network.

Sub-sea Cable
Telecommunication cable with special protection for under-water installation.

Subscription
The right to receive the public telephone service through the installation of equipment at the subscriber’s premises.

Subscriber
Client holding a contract for a telecommunication service.