Forward link= 890 to 915 MHz
Down link= 935 to 960 MHz

384 kbps(stationary 2Mbps)

GMSK and PCM.

Three traffic channels(TCHs)
1. TCH/F(full rate)
2. TCH/H(half rate)
3. TCH/8(one-eighth rate)

Two types of channels
1. Traffic channel
2.Control channel

GSM phones offer superior sound quality. Background sounds, disturbances, and static are vastly reduced and crossed-line conversations are also almost eliminated in gsm cellular phones . GSM phone sound quality is more like that of a fixed telephone. The main advantage of GSM mobiles are International Roaming ability, good sound quality, small cheaper handsets and ability to handle high volumes of users. Unlike analogue phones, your conversations using a gsm cell phone within the digital network are safe and secure.

7)What is the frequency range of cellular mobile communication?

800 to 900 MHz

8)What is known as roaming?

Handoff  between one pcs to another pcs. Roaming is a general term in wireless telecommunications that refers to the extending of connectivity service in a location that is different from the home location where the service was registered. The term "roaming" originates from the GSM (Global System for Mobile Communications Association) sphere.

9)What do you mean by handoff?
Switching over from base station to another.
Automatic link transfer.

10)Which service provider  uses CDMA technique?
Reliance and TATA Indicom

11)Which service provider uses GSM technique?
Airtel, Aircel and vodofone.

12)Why cell site shape is hexagon?
Covers all areas with equal power.
Omni directional antenna will be used in this.  It will cover full area.