What is the full form of ESMR?

Introduction

Enhanced Specialized Mobile Radio (ESMR) has enhanced ability than SMR. At first the land mobile communication on a commercial basis was provided by the establishment of specialized mobile radio 1979.

In this system there are one or more antennas, one or more transmitters and an end user. End user operates in interconnected mode or dispatch mode. Operating bands of SMR are VHF, UHF, 200, 700, 800 or 900 MHz.

Introduction to ESMR

Enhanced Specialized Mobile radio provides more capacity than SMR as it has the advantage of combining digital technology with cellular systems. ESMR offers digital mobile telephone services to the people through the channels that were previously used as a two - way analog dispatch service. Its operating frequencies are in between 300 MHz to 3GHz which is known as ultra-high frequency. Mostly its working band is 900 MHz.

Features of ESMR

Most probably Enhanced Specialized Mobile Radio operates in the same frequency band like specialized mobile radio but also having some enhanced features rather than SMR. In some of the ways the ESMR(Enhanced Specialized Mobile Radio) differ from SMR(Specialized Mobile Radio) such as,

• Compared to SMR, the most advanced digital technology was used in ESMR.

• Some special cellular technique known as channel reuse is used in ESMR.

• ESMR is regional and also national because of its wider geographical coverage.

It also has features similar to cellular telephone networks. The PTT (push-to-talk), half duplex mode and full duplex mode are also used in ESMR.

Half duplex mode

Half duplex mode is a two-way communication mode in which the station can receive and send information but not at the same time such as walkie - talkie.

Full duplex mode

In full-duplex mode the communicating device can send and receive information simultaneously. It is a simultaneous two-way communication. Example: video call, audio call, live chats.ESMR is useful for voice communication. In addition to this it can also offer things such as paging, wireless fax and data transmission.

Paging

Paging is one of the features of ESMR which is used to alert the receiver by sending information to the mobile device. It is a one-way communication system which contains the phone number of the user to make a call, text or information.

Wireless fax

This is a two way communication which sends and receives fax without tethering to the phone line. The only thing needed for this communication is the right device and better internet connection.

Data transmission

Transformation of data from one point to another and one point to multiple points are done in data transmission. Wireless communications channels are the examples for data transmission.

Applications of ESMR

The applications of ESMR are given below.

• It has the capability of cellular telephone.

• It is dispatched with two-way radio.

• It is used in alphanumeric paging in two-way paths and other data applications.

• It is used for session packet data transmission without a separate modem.

Advantages of ESMR

ESMR is a wireless communication system and some of its advantages are

Cost

As it is a wireless communication, there is no need for the intermediate wires, cables or other materials for communication. Due to this the expenses were reduced much and also it is time saving.

Installation

As there is no mediator for transmission because of wireless communication, the time for the installation is low and also highly simple to install without the disturbance of cables.

Tragedy recovery

Due to the wireless communication of ESMR, The loss of information during disaster is negligible. It is very useful as it can access the internet anywhere wirelessly. Data transformation is done with high speed.

Conclusion

A wireless communication that contains many mobile or portable transceivers which are linked in a network of repeaters. The approximate range of each repeater is 5 to 10 miles. ESMR mostly operates in the frequency range of SMR. But beyond that enhanced specialized mobile radio has some extra features. The range of the operating band of ESMR is around 900 MHz. But now it is emerging only in the U.S. It is a combined form of paging, packet radio, cellular and SMR in a single network.

FAQs

What is known as a wireless communication system?

Ans: Transmission of information from one point to another without the use of any intermediate wires, cables or any medium is known as wireless communication. The signals or data is transmitted by means of infrared, microwave, radio wave or electromagnetic wave. Some of the examples are cell phones, two way radio, remote controller and GPS receiver. Some of its types are infrared communication, Wi-Fi, radio frequency, bluetooth, satellite and cellular communication and microwave.

What are the operating modes of specialised mobile radio?

Ans: SMR operates in two modes such as interconnected mode or dispatch mode. In interconnected mode the mobile radio is linked with a public switched telephone network. Here a message from an end user transmits to the SMR base station and then the call is routed to the dial-up network and functions as a mobile telephone. In dispatch mode the voice is communicated through the air between two mobile units or one mobile unit and fixed place in a two way.

What are the examples for ESMR circuits?

Ans: The examples are Sprint Nextel system, Integrated Dispatch enhanced network and enhanced digital access communication system.