Transaction services- TRANSFER, BACKUP, POS, ATM, SCADA

The SkyWAN.Transfer network is compiled with the HUB central station, Ku band satellite channels and VSAT satellite terminals working with 1,2m diameter antennas. The network architecture is designed in star topology with the maximum capacity of 34.000 terminals. SkyWAN.Transfer service may be based on protocols such as: X.25, Async. (X.3/X.28/X.29), SDLC, TCP/IP (including IP routing).

  Transmission speeds are: 128kbps between the central station and the terminal, and 38,4kbps between the terminal and the HUB. There are Ethernet port (10BaseT, link RJ 45) and two serial ports (RS 232 link DB 25 Female) available on the satellite terminal. The nominal speed on IP port is 10Mbps while on the X.25 one it may be configured from 50bps up to 65kbps. The standard offer uses a shared model of access to satellite resources.

However, with more VSAT stations, the economy of scale and the abilities of hardware allow DataTrans to offer individually designed private networks, which satisfy specific requirements. The branches assigned by the client are connected via satellite (single satellite hop) through the narrow-band VSAT station with the DataTrans’ central station in Legionowo and then, through the narrow- band VSAT station (double satellite hop) or (optionally) through the POLPAK-T dedicated ground link with the customer’s central network node.

Option with a ground link between the central station in Legionowo and the customer’s central node helps prevents the transmission delay on the satellite link and/or increase throughput between customer’s central unit and his branches in case of applications, which use access to the central user server with particular intensity. VSAT station gives the possibility of direct connection to LAN network with the Internet Protocol (IP) and Ethernet 10BaseT interface or with X.25 protocol with RS-232 interface

 SkyWAN.Transfer network accessibility is 95,5% of the year, where accessibility means the possibility of data transmission between network nodes during 95,5% of the year.

 In the SkyWAN.Transfer service there is a 30Mb monthly limit of generated traffic for the whole customer’s VSAT network. There are three technical solutions available in SkyWAn.Transfer offer:

• Configuration is completely independent of the client’s ground links.
• Konfiguracja niezależna od łącz naziemnych na odcinku pomiędzy punktem końcowym (lokalizacja klienta) a stacją centralną sieci SkyWAN w Legionowie. Natomiast na odcinku pomiędzy Legionowem a centralą klienta wykorzystywane jest łącze naziemne (radiolinia, POLPAK-T).
• Configuration is independent of the ground link between the leaf node (client’s localization) and the SkyWAN network central station in Legionowo. However, the ground link (radioline, POLPAK-T) is used between Legionowo and client’s central unit.
• Configuration similar to B with additional satellite substitute link between the central station in Legionowo and customer’s headquarters.
  

All solutions are controlled by the remote management system, which helps to provide an early troubleshooting and remote diagnostic every port.

Wide-band services- SkyWAN.Cargo SkyWAN.Cargo network has been designed only with satellite terminals working with 1,8m diameter antennas and space located segment. Hub-less architecture simplifies the system and gives the possibility of work in full mesh configuration.

With single satellite hop. Network Management Server (NMS) provides system configuration, monitoring and managing the dynamic bandwidth allocation.

NMS is connected with all network terminals through the Master Reference Terminal (MRT). IP protocol (routing with: RIP-1, RIP-2, OSPF, BGP-4) is a standard one for SkyWAN.Cargo service, Frame Relay and ATM protocols are available optionally.

PROTOCOL	INTERFACE	LINK
IP	ETHERNET	10BaseT RJ 45
Frame Relay	EIA/TIA-449 / ETA/TIA-530 V.35	26-pin SCSI cables: RS-449 37-pin D type, RS-530 25-pin D V.35 type
ATM	ITU-T G.703/G.804	2x 75  BNC

Satellite terminal may be supplied with 3 different interfaces maximum. Maximum terminal throughput for a basic satellite segment is 750kbps. Terminals with the throughput of 1,5Mbps are available as an option. ps.