Communications Articles

These phones are ideal for users that are only interested in making their lives simpler. They feature the same 2.4 262K with QVGA TFT touchscreen display with QVGA resolution. These phones are ideal for users that are only interested in making their lives simpler.

iPhone 3G delivers an amazing 10 hours of talk time on 2G networks and 5 hours using 3G, with up to 5 to 6 hours of web browsing, up to 7 hours for video playback and up to 24 hours for audio playback. iPhone 3G gives users ever faster access to the Internet and email over their cellular network with quad-band GSM and tri-band HSDPA for voice and data connectivity around the world.

The display on the front of this Polar White or Mystic Black phone is a 2-inch large TFT display with a resolution of 176 x 220 pixels, and up to 262.144 colours. The F305 measures a good 96 x 47 x 14.6 millimetres, and weighs in at just 97.5 grams, making it a bit heavier than it actually looks.

It supports GPRS, EDGE, 3G, Wi-Fi, Bluetooth v2.0 with A2DP and USB. Also supports SMS, MMS, Email & Instant Messaging. BalckBerry 9000 comes with an integrated organizer, it can help you stay on top of your day.

The C905 Cyber-shot also sports WiFi and a built-in GPS receiver with A-GPS support. It comes in three variants, two with full support for UMTS and HSDPA in the certain regions. The battery is good for 380 hours of standby or 9 hours of talk on GSM networks, or 360 hours of standby or 4 hours of talk on 3G networks.

Quad-band GSM support also allows owners to easily stay connected while they are on the road, while the large, bright display is perfect for sharing images captured with the 2 megapixel camera. The Nokia 8600 Luna has a smoked glass effect slide-down plastic keypad cover, a 2MP camera, FM radio and 1GB on-board memory on its Series 40 OS.

Qnext unifies communication, broadcasting, digital media sharing, 4-way video, 8-way voice. Combines all contacts in one place. Universal IM:- MSN-Yahoo-AIM-ICQ-Google Talk-Jabber-IRC. Group chat and file transfer of any size. Instantly share files, documents, videos and photos or stream music to anyone even if they don’t have Qnext. Remote PC access, secure worldwide private network, games, P2P-Web2.0. Free download for Windows-Mac-Linux.

Finally the 3.15 Megapixel camera provides the kicker to this phone’s appeal. With 3G data transfers are faster than ever and since this is the wireless signal that will soon be the standard. USB and Bluetooth enable you to connect the phone to the computer to transfer files from your collection into the memory card.

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.

The Nokia 6120 features two cameras - a 2.0-megapixel camera with 4x digital zoom, flash and panorama mode for taking high-quality photographs as well as a second camera in the front that adds a personal touch to calls by making use of the video call feature. The new Nokia HSDPA technology makes these applications, and many others, more accessible.