VIPERSAT VSAT HUB
For 2-way SCPC customers located in West Africa. Global Teleports (UK) Ltd had several big teleport dishes to provide worldwide service. In this case the hub dish is at Washington MEDIAPORT, USA. The equipment is controlled remotely from Global Teleports HQ at Brookmans Park, London, UK.

Coverage map showing west africa beam from NSS-7 satellite

Washington NSS Mediaport USA

Located just outside the U.S. Capital, New Skies' Washington Mediaport acts as a vital communications hub and customer co-location facility, with major terrestrial backbone connection for internet and VoIP service.

The large hub dish operates into cross-strapped transponders which connect to the high power West Africa Ku band spot beam coverage on the NSS-7 satellite at 338.5 deg east (21.5 deg west) longitude.

Satellite broadband and internet and VoIP access using NSS7 high power Ku band spot beam

Global Teleports Vipersat Hub in Washington, DC

Example customer VSAT and associated LAN network in West Africa

The hub uses a Vipersat CDM-570 modem to transmit a carrier up to 10 Mbit/s, which is which is received by all remote VSATs. The specific customer VSAT terminal then extracts just the wanted data stream intended for it.

The hub has a Vipersat receive modem for each inbound carriers from a remote site. Carrier sizes may be from 2.4kbit/s to 10Mbit/s dedicated continuous SCPC bit rates.

Monthly price for dedicated service is $700 per 100kbit/s or pro rata, less (2/3 or 1/2 price) for large dish (8-QAM and 16-QAM) operation. Less for shared service as per sharing ratio.

Both directions of transmission have header compression and payload compression to maximise data throughput. QoS prioritisation is also applied which gives VoIP speech packets priority, smoothing speech flow and avoiding gaps in conversations.

The hub modems are connected to the internet via a Cisco router for worldwide terrestrial connectivity and VoIP access. The hub modem is controlled and managed by data link from Global Teleports (UK) at Brookmans Park, near London.

The customer VSAT terminal comprises the outdoor equipment, typically a 1.2 to 1.8m dish, high stability PLL receive LNB and a 1, 2, 4 or 8 watt transmit BUC depending on bit rate. A 3 watt TRIA is available, subject to checking suitability for the exact frequency of operation.

The customer connects their own private LAN to the satellite modem using a hub or switch and as many PCs or VoIP phones as required, up to 252 maximum. A broadband wireless router is ideal, allowing a a number of laptops and wireless VoIP phones to be connected as shown.

The IP addresses in the image above are for illustration only. You set all PCs to the gateway 192.168.151.105 Subnet 255.255.255.0. You number your PCs and VoIP phones with IP addresses in the ranges 192.168.151.2 to 192.168.151.104 and 192.168.151.106 to 192.168.155.254

Your customer VSAT modem is remotely controlled and managed via the satellite link from Global Teleports at Brookmans Park (UK).

West Africa satellite dish pointing angle calculator.

Contact details: By Post: Global Teleports, Brookmans Park Radio Station, Great North Road, Hatfield, Herts, AL9 6NE, England

By Phone: +44 (0) 1707 648311 By Fax: +44 (0) 1707 648 319 By Email: enquiries@globalteleports.com

In co-operation with:

Links: Vipersat VSAT Hub at Brookmans Park Global Teleports C band NSS7: Satellite internet access service for All Africa

► Page created 15 May 2005, amended 10 Feb 2008 Eric Johnston

Southern Africa coverage: Angola, Zambia, Zimbabwe, Malawi, Namibia, Botswana, Mozambique and South Africa satellite internet access, VoIP and broadband VSAT and SCPC services