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Which is more reliable between Wireless and Terrestrial Network?

Basically, there are two key criteria should be considered: (1) the optimum suitability of the technology with the application and (2) the availability, reliability and flexibility of the technology. The optimum selection will depend on those two factors as any technology option will have its strength and weakness. For remote offices/area that is far away from Terrestrial network infrastructures to reach, Wireless Network is your first choice (availability & reliability) with latency factor need to be considered, but you don’t have to cover cost of last mile installation cable on Terrestrial to each of your remote offices and have only few points of maintenance to do (reliability and flexibility). For remote office located in Terrestrial network infrastructures coverage area, Terrestrial network is the optimum choice, taking into account the service provider support as usually in terrestrial network - there will be more maintenance/failure points to be checked and maintained as and when communication problem happened in your network at any time. PRIMACOM have always considered the optimum solution when we offer our solution to any clients who are implementing their ERP system.

We have many remote area and offices to be linked to our Head Quarter but the location is in another island and very far away from city/town communication infrastructure, what’s the solution?

With current available technology, there are many communication network devices alternatives with some consideration refer to its needs can be used to linked up those remote areas and offices to their Head Quarter, e.g.: Microwave, RF Modem and VSAT(Very Small Aperture Terminal) and hybrid technologies. PRIMACOM has solid experience with all of those technologies

What is VSAT?

VSAT (Very Small Aperture Terminal) is Earth Station consists of (InDoor Unit) Satellite Modem, Router and (OutDoor Unit) Antenna Disc, LNA, SSPA, RFT, Power Supply. This set has its capability to connect data, image and voice to other points of VSAT Earth Station in its group or as its pair via Satellite on space as reflection point- transponder.

Basically what are the different between Microwave, RF Modem and VSAT?

Microwave and RF Modem :

•	Need LoS (Line of Sight), which mean every point to be linked will have to be able to see each others (by installing tower, etc.). Terrestrial Network or VSAT Network at the end of linkages will still be needed as Microwave and RF Modem distance range capability, that mean more points to be checked as if network problems happened. VSAT :
•	Be able to link any spots in its satellite coverage areas on Earth without LoS(Line of Sight) needed – fast deployment, small space requirement, no tower investment needed and easy migration/upgrade as if needed in the future time.
•	Only (2) two points to be checked as if network problem happened, this mean higher On-line time service and simple network configuration.

Which will give higher On-line Level Percentages Terrestrial and VSAT?

The optimum choice is VSAT; there are only 3 (three) components in VSAT network : “A remote VSAT – Satellite Transponder – B remote VSAT” makes smaller number of maintenance check points which in turn it will provide easier maintenance and faster recovery in system failure cases. And there are predicted two cases only that can cause VSAT link problems: Sun Outage and Sun Eclipse which only happen few minutes in a year at predicted time and places.

What kind VSAT Link Communication Technology that we can have? And basically what’s the different?

Generally there are two kind of VSAT products:

•	VSAT SCPC (Single Channel Per Carrier) It provides dedicated bandwidth, point to point or multi-point topology network, private network as no HUB station interference, good quality of voice (ITU G.723.1 & G.729), image and data transfer refer to its bandwidth size.
•	VSAT Broadband. It provides share bandwidth, star topology network, HUB station as network management center, support to almost all IP based applications.

What are the most important points to be considered in choosing VSAT Communication system?

The most important factors are (1) the suitability of VSAT technology solution with the customer’s applications and (2) the VSAT operator commitment and experiences in supporting ERP implementation in similar industry. In addition to those Link Communication Technology refers to Application that going to run into it, Spot and Service of Satellite Transponder that going to be used, HUB Operation service equipments and support, Service Level Agreement provided by VSAT Operator, and Government License to Operate VSAT in the related region.