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•The packets for voice traffic can be prioritised over other forms of traffic to ensure that voice gets on the TDMA faster than other data.
When the system is configured correctly, the result is an incredibly high control of the quality of the system for voice, which can have lower delay (even including the satellite delay) than is sometimes experienced with terrestrial SIP voice systems.
The Romantis offers Layer 2 access and has been trialled with an external layer 2 encryption device being bridged through the Romantis router.
The Romantis is universal hardware, so even at the end of a 2 or 3 year contract- if they aren’t needed any longer, they can be redeployed/ re-enabled to operate in another network.
Case Study 1. 5 site in-country network
A mining company in an African country wants to connect its HQ in the capital city in country, with 4 remote sites that has to use satellite. The in-country regional hub has a 2.4mtr, and 1.8 is desired at remote sites to keep transport costs down. The M&C supervision and internatiional connection is through a European based hub.
iSat is a reseller of the “Universal Hardware Platform” (UHP) satellite modem manufactured in Germany by Romantis. The UHP has the ability to operate in SCPC, Full Mesh, TDM/TDMA star hub, and economical combinations of all three. The different operating modes are features which are enabled by the purchase of different software keys.
A unique feature of the UHP is that it has 2 receivers- a DVB reciever and a TDMA receiver- both of which can be receiving at the same time.
The Romantis includes a VLAN capability, so IP traffic can be directed effeciently even in Full Mesh mode, (ie when you ping a site- you don’t get all the sites responding).
The Romantis has multiple levels of QOS to prioritise traffic, as well as programable TDMA slot lengths, and minimum fixed slots per site. Together these three features mean that for voice traffic:-
•When a fixed number of slots are available for a site it can mean the voice gets loaded into a slot without the need to request a slot from the hub and wait.
•The TDMA slot length can be long (for maximum effeciency), or can be short to reduce the time delay for voice.
Network configuration options
Various options can be considered and in each case the points represent the following stations diagramatically
The entire Romantis price list is attached in appendix 1, and elements of that list are selected here to show the hardware costs for Case Study 1
The customer wants to start a small scaleable VSAT network, and gradually pay more for higher technology as the savings in the incresaing volume of space segment cost justify the investment.
Cost effective UHP SCPC DVB-S2 modems
The solution in this case is to start with transmitting from UK in TDM DVB-S2 and return SCPC to a bank of SCPC receivers. The maximum modulation is 16APSK ACM in DVB-S2.
With growing numbers of remotes, a point will be reached when its justified to change the UK hub to a TDM outbound as before, but create a TDMA pool on return. The TDMA pool for a small number of sites is most cost effective using the TDMA full mesh option.
With further growth of remotes, a decision can be taken to invest in a full TDM/TDMA hub reducing the cost of remote hardware to the minimum. The following tables illustrate the 3 phases.
Hardware cost phase 1 TDM DVB-S2 outbound, DVB-S return. Star network.
Recommended spares would include a full mesh master for the hub (5,900), and one full mesh slave at the in-country hub (3000). This in-country spare can fullfill the role played by any of the UHP’s at any in-country site (hub or remote). The hardware is the same at all the in-country sites, and the UHP feature set includes all the features available at prices up to and including the highest cost feature purchased.
Calculated BUC size
The BUC sizes on the 1.8mtr were 5 watts and calculated to be below the requirements of ITU neighboring satellite interference.
The BUC size at the 2.4mtr regional hub was 20 watts.
The infrastructure at the supervisory site was already established.
Case Study 2. A scaleable network approach.
Hardware cost phase 2 TDM DVB-S2 outbound, Full Mesh TDMA.
The network operator recognises that creating a shared inbound TDMA channel from the remotes would make a huge advantage of the space segment so changes the configuration to retain the TDM outbound, and use a full mesh TDMA return channel. The UHP’s are upgraded for new functionality, and any units at hub can be re-allocated to function as remote.
Hardware cost phase 3 TDM DVB-S2/ TDMA return.
The network operator expects the network to expand to over 30 sites. The anticipated cost of buying so many Mesh Slaves at 3000 dollars each will create an uneconomic solution compared to upgrading the hub to TDM/TDMA and acquiring remotes for 1000 dollars per unit.
For any potential network opporutnity, a demonstration of the configuration would be available to allow a direct comparison with other technologies.
Services available from iSat
1.Pre-configuring networks on the bench and running FAT in advance of deployment.
2.Conduct the complete shipping and installation project management until SAT.
3.Provide all information promptly required by customer for country to issue a visa invitation.
4.Supply the necessary Onsite Acceptance Test and Training documents to be provided to TRL.
5.Provide over-the-phone support for 12 months after the successful Onsite Acceptance Test, on a as-required basis.
6.Maintain an effective web-based portal for organising returns and repairs.
Prices and charges
For extraordinary value for money and flexible network design - contact iSat.
Hardware cost phase 4 TDM DVB-S2/ TDMA return with meshed spur to regional HQ
There is one site that needs to talk to a regional HQ. The TDMA can be controlled from the hub to allow direct connection between remote and regional HQ. This is called half mesh and depends on the antenna at regional HQ being adequately sized. No upgrade cost required for this- just some bandwidth of the TDMA pool will be allocated by the hub for the function.
1 unit will support any type of UHP because the supplier has sold a licence to use a product in a certain mode, so if you despatch a failed unit, then another can be immediately enabled.
The two examples show that for price and flexibility, the Romantis UHP is better than any other solution currently available in the market.