WiMAX technology offers wireless data in a related form as compare to WiFi but its level and speed allow to build hybrid and wireless networks, of any size, anywhere. It is formed to encourage conformance and interoperability of Wireless Metropolitan Area Network. WiMAX offers a consistent technology according to its standard. WiMAX technology open could let product manufacturers make revenues of scale via producing number of WiMAX products & components to single IEEE 802.16 standard, this also allow component manufacturers buy low-cost, standards compliant components from rival component providers. This would definitely help existing wireless service providers.

WiMAX technology will offer high data speed network connections and in this manner serve as a backhaul for WiFi LAN (WLAN) hot spots, where people on the move can access carriers’ WiFi services on mobile technology basis, because this technology allows interoperability among different systems. And service providers lacking a mobile network can use a WiMAX technology network at comparatively low price. WiMAX technology possibly will offer a much cheaper, easier to build network infrastructure other than the physical medium of WiFi backhauls that cable, T1 or DSL systems presently offer.

Because WiMAX is based on IEEE 802.16 Standard and HiperMAN, the IEEE and ETSI have each become accustomed it’s standard to take in many of the other’s essential characteristics. IEEE 802.16 standard partitioned its MAC (Medium Access Control) layer into sub-layers that hold some different transport equipments and technologies, together with Ethernet, IPv4, IPv6 and other asynchronous transfer mode. This allows traders to use WiMAX technology and no matter what technology they support for transmission. WiMAX technology has a wide communication range up to 50 kilometers because principles allows WiMAX network to transfer data at higher rates and because of this move towards use of directional antennas that generates persistent radio signals. WiMAX base station provide service to only 500 users at a time not more than that just because to they are sharing bandwidthand this factor may cause lower date rates among. Technically every single station will possibly provide communication an area inside a 10 miles radius. To compare WiFi with WiMAX technology the last has a range of few thousand feet. while WiFi  has a range of only a few hundred feet.

Moreover  WiMAX network broadcasts data communication over several broad signal frequency ranges. And this exceptional capacity to work in several ranges allows to communicate above the frequencies that will evade  interference with other wireless network applications. Also the  flexibility of this system’s communication allows providers to employ different frequencies that depend on the speed and range needed for a particular data communication. Amplifying data capacity and bandwidth via dividing broad capacity channels to many narrowband channels, the WiMAX technology attains  higher data transmission rates in part by OFDM (Orthogonal Frequency Division Multiplexing).Every channel uses different frequencies that can transmit different pieces of a message at the same time.

One of the important advantages of data transmission is that the channels do not overlap, in spite of the fact that the spaces between channels are extremely close. The primary IEEE 802.16 standard uses the 10 to 66 GHz frequency range And it is very suitable because this frequency range shrinks the multi path distortion that arises when transmitting signals that do not follow the line of sight echoed items and finish off out of sink, thus jumbling the inbound communication and reducing bandwidth.

In theory WiMAX network can offer single channel data rates up to 75 Mbits/s equally on the downlink and uplink. Service providers can use several 802.16 channels for single broadcast to offer bandwidths of up to 350 Mb per second.

Third generation mobile network technologies will support around 115 Kbps. The accepted IEEE 802.11b WiFi WLAN technology data rate are limited to 11Mbps, on the other hand newer 802.11a and 802.11g provide up to 54Mbps in favorable conditions but practically all of the them transmit at lesser speed.

In the meantime WiMAX network is extremely scalable as it is simple to include broadcast channels to offer extra bandwidth as required. And as far as security is concerned in WiMAX technology it uses PKI (Public Key Infrastructure) authentication, which transmit via digital certificates by identifying parties over trusted authorities. The IEEE 802.16 system encrypts data by using 56 bit DES (Data Encryption Standard) keys.

The wireless services are supplied at higher frequencies as the line of sight constraints required the setting up of many antennas to cover up the equivalent area and this increases to a great extent the expenditure of setting up wireless technology. The available frequencies for new wireless standards such as IEEE 802.16 are higher as some of the other wireless technologies are more sought-after to diminish ranges that have been approved for other use.

The WiMAX technology is always supported by the WiMAX Forum which comprises a group of commercial leaders such as AT&T, Cisco, Samsung, Intel, and some other giants. This forum involves many working groups that highly focused on regulatory, marketing, technological characteristics. Moreover the certification working group intends to certify interoperability among WiMAX products from manufacturers internationally

Powered By http://www.mlltelecom.com/

SIP is widely used in voice and video calls made over the internet. SIP is used for video conferencing, streaming multimedia, instant messaging and online games. SIP is used in 3GPP signalling protocol and a permanent feature of the multimedia feature available is most mobile phones and cellular systems.

SIP can be used for conferencing calling and adding or terminating users to the call. SIP, in technical terms, is transport independent and text based so that it can be read by humans so that they can analyse SIP messages.

Now that you have mastered SIP, let’s talk about VoIP. Simply, VoIP means communicating using the internet. Breaking it down, V stands for voice, O for over, I for Internet and P Protocol. Voice over Internet Protocol allows you to implement the transmission of voice over the internet. VoIP can cut the cost of your communications internally within your business and externally with your clients.

WIFI is the trade name for the wireless technology used in home networks, mobile phones, video games and more.

WIFI is supported by nearly every modern PC operating system as well as a lot of advanced game consoles, printers and other types of peripherals.

Together, SIP, VoIP and WIFI create a communication platform that utilises the internet and allows you to communicate more efficiently and cheaply.

SIP, VoIP and WIFI allows you to be lifted from the confines of wired phones and enables you to have 3 way calls, call waiting, transfer calls as well as integrating video conferencing enabling you to get to know your clients and audience better.

Wireless LAN (Wifi Lan) Technology standard 802.11b has the strongest momentum to becoming the main standard for corporate internal wireless LAN networks. The bandwidth of 802.11b is 1 mbits and operates at 2.5 Ghz frequency.

The successor of this current 802.11b standard is 802.11a and it is designed to be faster speed and operate at a different frequency. While 802.11a standard and the technology behind it will be in the ner distant future, 802.11b is here today and many companies and even individuals are deploying and using it now.

SOA as in Service Oriented Architecture is an architecture of building systems based on loosely coupled interoperable services. SOA has a broad meaning that goes beyond software architecture. SOA is an architecturual guideline to building a system based on services. What really are services? In SOA, Software and Hardware and the system built around it is called a Service. While SOA is mostly viewed from the context of a Software, but nothing stops it from being a Hardware. Services may be both hosted as software or hardware. These services are offered in a common communication link (like Internet) so that the consumers (the clients) can see what services are being offered. The term loosely coupled in SOA is very important. Loose coupling predominantly means that the Service is self contained with minimal or no dependencies. That means, the consumer is guaranteed to get the expected result from calling the service, if the parameters to the service meets the specification. A service expects to receive data upon which it will operate. This data is fed to the service in various ways. Among many proprietary ways in which data may be fed, some standard way of sending and receiving data is REST (Represental State Transfer) and SOAP (Simple Object Access Protocol). These formats have no relationship to the service itself (hence the loose coupling), rather it represents data and the structure of the data. Therefore, both REST and SOAP messages may be interpreted by any service and the client.

The reason for SOA to be interoperable is in fact derived from loose coupling. Adopting a data dependent message format like REST or SOAP makes the service interoperate across any platforms. SOA is not associated with HTTP protocol or JMS service. A SOA service therefore may be based on REST, SOAP or some proprietary format as long as the services are loosel coupled and interoperable. If the protocol is SOAP, it is also called Web Service. If the format is REST, it is called RESTful service. A single service may support both SOAP and REST. Both SOAP and REST are data representation format, not a transport. Because the service and the client have to be somehow linked, the transports may be HTTP/HTTPS, JMS, FTP, Files, etc. SOA does not limit the kind of transport. The most popular are, however, HTTP(S) and JMS. HTTP(S) is the most popular due to its support by web browsers making it firewall safe as well as web browser ready. SOA services may be consumed by web applications as well as any other platform specific applications. JMS (Java Messaging Service) is usually used in cases for asynchronous communication between the client and the service. An ideal SOA service should be able to handle both synchronous and asynchronous transports. Typically, synchronous transport uses RPC based protocol and asynchronous transports use message based protocol.

Let us consider that we have an AddressBook service as a SOA service, which may be consumed by both a mobile phone application written in J2ME as well as a PC application written in C# .NET. AddressBook service must be interoperable due to the fact that it is consumed by two different applications written in two different programming languages. The mobile phone sends REST based data format through HTTP to the AddressBook service, while the PC application sends SOAP format through JMS. The AddressBook service is designed to support both REST and SOAP, so as soon as the data in either format is received by AddressBook, it can process the data and return the result in the same format in which it received. Notice that the transport layer was not a concern for the AddressBook service. Sits between a SOA Service and the client is a routing middleware called an ESB (Enterprise Service Bus). It is practically a router which converts data or transports in one form to the other. While modern ESBs are much more than just a router, but it is the router portion that is responsible for all routing activity for the AddressBook service. In general, ESB is not a necessity, but if not present, would require the service itself to support multiple protocols and message formats. This makes each services difficult to maintain. Therefore, having an ESB in between a service and a client makes services easy to develop and maintain.

SOA achieves loose coupling by eliminating the transport layer and adhering to the structure of data and by keeping the data represented in a standard format, it becomes interoperable. SOA services are also described in a standard way. Web Services uses standard XML template called WSDL (Web Services Description Language) to describe the messaging format to communicate with the service. WSDL may also be discovered by having them advertised in registries. A registry is conceptually similar to the domain name registrar, except now that it is for a SOA service.