# Key Concepts

These terms are used throughout the help and the panel.

<table id="bkmrk-termmeaning-user-%28su" style="width: 100%;"><thead><tr><th style="width: 17.3016%;">Term</th><th style="width: 82.6736%;">Meaning</th></tr></thead><tbody><tr><td style="width: 17.3016%;">User (subscriber)</td><td style="width: 82.6736%;">A customer account that connects to the internet with a username and password.</td></tr><tr><td style="width: 17.3016%;">Manager</td><td style="width: 82.6736%;">A panel account: staff, reseller or sub-reseller. Each user belongs to a manager (its *parent*). Managers form a tree under *admin*.</td></tr><tr><td style="width: 17.3016%;">Permission group</td><td style="width: 82.6736%;">The set of permissions that decides what a manager can see and do.</td></tr><tr><td style="width: 17.3016%;">Profile (package)</td><td style="width: 82.6736%;">The service: speed, duration, quota, price and IP pool.</td></tr><tr><td style="width: 17.3016%;">Activation</td><td style="width: 82.6736%;">Renewing a user's subscription for one period. It is paid from a manager's balance, the user's balance, a card or reward points.</td></tr><tr><td style="width: 17.3016%;">Expiration</td><td style="width: 82.6736%;">The date and time the subscription ends.</td></tr><tr><td style="width: 17.3016%;">Quota</td><td style="width: 82.6736%;">Traffic or time the user may use, per period or per day.</td></tr><tr><td style="width: 17.3016%;">FUP</td><td style="width: 82.6736%;">Fair Usage Policy: a reduced service users move to when they expire or use up their quota.</td></tr><tr><td style="width: 17.3016%;">Extension</td><td style="width: 82.6736%;">An add-on package that adds days or traffic without changing the profile.</td></tr><tr><td style="width: 17.3016%;">Balance</td><td style="width: 82.6736%;">Money of a manager (used to activate users) or of a user (a wallet).</td></tr><tr><td style="width: 17.3016%;">NAS</td><td style="width: 82.6736%;">A router or BNG that subscribers connect through and that talks to SAS Radius by RADIUS.</td></tr><tr><td style="width: 17.3016%;">Session</td><td style="width: 82.6736%;">One connection of a user, from connect to disconnect.</td></tr><tr><td style="width: 17.3016%;">Interim update</td><td style="width: 82.6736%;">A message the router sends regularly for each online user with the traffic used.</td></tr><tr><td style="width: 17.3016%;">CoA / Disconnect</td><td style="width: 82.6736%;">Requests SAS Radius sends to the router to change or end a user's session.</td></tr><tr><td style="width: 17.3016%;">UCP (user portal)</td><td style="width: 82.6736%;">The website where subscribers see their account, renew and pay.</td></tr><tr><td style="width: 17.3016%;">Site</td><td style="width: 82.6736%;">A brand or branch with its own domain and login page.</td></tr></tbody></table>