How long are the time delays with satellite data transmissions?
Geostationary satellites are located in orbit approximately 36,000 kilometers above the equator. A roundtrip time to a satellite for data needs about 250 msec, the 2-way protocol latency is about 600 msec including SurfBeam system latency. To mitigate latency, which would impact on TCP throughput and web browsing speeds, a Performance Enhancing Proxy (PEP) and Web acceleration are integrated into the SurfBeam modem and DOCSIS head-end system.
What are the maximum uplink and downlink speeds?
The SurfBeam terminal is able to receive at speeds up to 22mbps. The 2 Watt amplification allows transmission of data to the satellite by the consumer at speeds exceeding 6mbps according to the frequency band, the satellite, the remote antenna size and the location of the terminal.
How stable is the Tooway™ service in bad weather?
At one time heavy rain was thought to be a potential barrier to successful deployment of Ka-band satellite systems. Indeed, the reduction of signal level was so impactful that it was difficult to guarantee a high-quality service. However, Tooway™ automatically responds to rain fade with uplink power control and adaptive data coding techniques (Adaptive Coding and Modulation - ACM) that overcome potential outages, while optimizing the use of satellite transponder bandwidth. This gives the Tooway™ network higher reliability compared to other two-way consumer satellite services offered in Europe.
What frequency bands are used for Tooway™?
Tooway™ operates in Ku and Ka-band. Ka-band capacity is on Eutelsat’s HOTBIRD™ 6 satellite at 13° East, and Ku-band capacity on EUROBIRD™ 3 satellite at 33° East. At the end of 2010, Eutelsat will deploy a dedicated Ka-band satellite with multiple spotbeams across Europe, KA-SAT.
What is Ka-band and what are its advantages?
Broadcast satellites principally operate in Ku-band frequencies that have the benefit of offering a broad geographic coverage through a single footprint. Ka-band, which is now beginning to be exploited over Europe, has other benefits:
More Ka-band bandwidth is allocated to each satellite by the ITU (1 GHz per orbital slot)
For dedicated two-way communications, spot beam technology allows extensive frequency reuse, effectively lowering the cost of the spectrum
The larger amount of available bandwidth supports higher transmission rates, supporting higher peak speeds for individual subscribers
The higher Ka-band frequencies allow smaller antennas to be employed for the subscriber equipment
The blanket licensing requirements for subscriber premises equipment can be more easily met with low cost subscriber terminals
Who handles the platform operations?
Located in the SkyPark teleport in Turin (Italy) the platform and hub operations for the Tooway™ network are operated by Eutelsat’s broadband subsidiary Skylogic. Skylogic employs more than 50 people on site and operates 14 hubs using capacity on eight Eutelsat satellites. Dedicated staff will work at the teleport to maintain the highest availability of service.