With the deregulation of the satellite internet provision market in the developing world a need has arisen for asymmetric traffic flows. Internet traffic typically has a 4:1 ratio of inward to outgoing traffic. The user send a request for a web page, the server downloads the page, graphic images, scripts etc.
A typical application is for E3 / E2 ( 34/8 Mbit/s operation). The Metrodata AP3000 is an ATM-based access device supporting various types of traffic and links. Here it's HSSI CBR module is ideal to support asymmetric rates, and connect to standard HSSI Interfaces on the Satellite modems. A HSSI Y cable is required to connect to the satellite modems.
Another feature is that the main internet exchange centres tend to be located some distance from the earth station, hence a wide area connection is required. In the US, the DS3 45Mbit/s interface is common, in Europe E3 34Mbit/s. Yet another major benefit here is that the whole link between the AP units runs ATM, with it's reliability, predictability and management - essential in such a key and expensive communications link.
The AP family of products allow major cost savings in satellite/terrestrial integration. Access Processor Overview