CDM570 modems Vipersat VSAT hub serving West AfricaGlobal Teleports (UK) Ltd has several big teleport dishes providing 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. |
Contact details: Roger Boddy. |
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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. |
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| 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. Return link carrier sizes may be from 2.4kbit/s to 10Mbit/s dedicated continuous SCPC bit rates. Monthly price for dedicated service is around $700 per 100kbit/s or pro rata, and less (2/3 or 1/2 price) for large dish (8-QAM and 16-QAM) operation. Price is less per site for shared service, as per the 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). |
Page created 15 May 2005, amended 1 July 2008 Eric Johnston
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