Skip to main content

Frequency bands and telecommunication

Hi all,
Today we are going to see the telecommunication and its bands.

 you might aware of these, and of course you also think why we connect from networks to telecommunication.

 yes, 

 we have to depend both, and we want to also know about the telecommunication and its bands.

 We start with,
  
2.4 GHz ISM band

 The 2.4 GHz is the commonly used band used for wireless networking communications.it has 83.% wide and life from 2.40 GHz to 2.4835 GHz ISM band.This uses 2.4 GHz ISM band under the wireless networks 802.11 standard and there are three major networks in 802.11

 we will see in detail about 802.11 later in next post

 1. 802.11
2. 802.11b
3. 802.11 g

 Mostly 2.4 GHz ISM band used in microwave ovens,cordless telephones,monitors and wireless video coamera.

 The biggest disadvantage is the potential of tolerance, means it cannot hold the full load in normal conditions.

x-axis spread spectrum signal
y-axis power
sinusoidal frequency - narrow and signal
short curve - spread spectrum signal

 Direct Sequence spread spectrum :

 DSSS specified in the primary of 802.11 and provides 1 and 2 Mps RF communication using the 2.4 GHz ISM band DSSS was also specified with 802.11b and provides 5.5 and 11 Mbps RF communications using the same 2.4 GHz band.The 80211b 5.5 and 11 Mbps speed are known as high-rate DSSS (HR-DSSS).

 802.11b devices are backward compatible with 802.11 DSSS devices.This means that an 802.11b uses transmit DSSS at 1 and 2 Mbps and using HR-DSSS at 5.5 and 11 Mbps.However, 802.11b devices are not capable of transmitting using FHSSS.

 Next post we will see about 802.11 networks

 Thanking you

 Vinoth Kumar Sritharan

Labels:

Comments

Post a Comment

Popular posts from this blog

Fashions and Apparels in Ecommerce

Hi all, Today we are going to discuss about Fashions and Apparels in Online Ecommerce websites. Survey shows the high sales in online shopping : 1. Apparels and fashion 2. Health and Beauty products 3.Travel accessories. 4.Skin care 5. Hobbies and craft 6.Mobile and accessories. 7. Imitation Jewellery These above the frist one comes into fashions and apparel, where every one knows about it. I am the ecommerce analyze and also affililator of products for the above, where we can earn according to your daily work you credit. Below these are some of my  products i can show you for apparels. 1.Womens fancy pyjama set and Night suit. 2. Kids fancy pyjama set and night suit. 3. Kids Branded shorts. The above are the products which we can affiliate the products where we can do it simply in affiliate programs.
Post a Comment
Read more

Wireless topologies

Hi all, Today we will see about different LAN technologies, Wireless wide area network (WWAN) A WWAN covers a broad range and geographical boundaries but obviously uses a wireless medium.It accesses T-mobile,verizon and vodaphone and a variety of competing technologies to carry data by cellular technologies. Examples of these GPRS,CDMA,TDMA,and GSM. Many of them might be knowing these concepts and meaning, but my work is only for general beginners and overlay of concepts.i do the post for  the above. GPRS - General packet radio switching CDMA - Code division multiple access. TDMA - Time division multiple access. GSM - Global system for mobile communication. Data rates and bandwidth using these technologies are slow when compared to  802.11 wireless technologies. Wireless metropolitan network (WMAN) It covers the suburbs and metropolitan cities.it is associated with 802.16 standard, defines broadband wireless access and it sometimes referred as world...
Post a Comment
Read more