DAMA: Demand Assignment Multiple Access Explained

This page explains the fundamentals of DAMA (Demand Assignment Multiple Access). It also details the features of DAMA systems located at both the Hub Station and Remote Station.

The term DAMA, or Demand Assignment Multiple Access, is frequently used within the context of satellite communication networks. The DAMA concept is primarily employed in VSAT-based networks, where capacity is dynamically assigned based on real-time demand.

The first commercial implementation of a DAMA system was known as SPADE. SPADE is an acronym for Single channel per carrier, Pulse code modulation, Multiple Access, Demand assignment Equipment.

DAMA at Hub Station

The DAMA system at the Hub station features an NCS (Network Control System). This system is responsible for communicating with all the remote VSATs using a signaling modem. It dynamically manages the assignment of traffic channels to traffic modems based on demand, utilizing a dedicated signaling channel.

DAMA at Remote Station

The DAMA system at the remote VSAT works in conjunction with the centralized DAMA at the Hub. Its role is to establish communication links and monitor the status of all VSAT equipment on the remote end. It also provides equipment reports to the Hub station for the NMS (Network Management System).

As previously stated, a typical DAMA system requires:

• Traffic modem (for handling traffic channels)
• Signaling modem (for managing signaling channels)
• DAMA controller (at both the Hub and remote locations)