Introduction: Townsvilla Police section has been restructure and traveling to open new caput one-fourth edifice. The headquarter will be the house of the communicating. Our purpose is implement a computing machine web which is surrender 100 kilometer and the web is divided into for territory one decision maker section one investigator section. Each territory has eight computing machines. In detective section have 22 computing machines and administrative section has six computers.They all are communicated with in one another in this web and linking around the universe via interne.The Police section of Twinsville has been restructure and shortly opening a new central office edifice. The headquarter will hold all the communicating and computing machine system that will assist the Police section. To take a best web topology for the in house web ( LAN ) for the Police section following probe have been carried out.
Operation of a topology:
Network topology is the physical interconnectednesss of the elements in a computing machine network.The term web topology referse to the ballad out construction of a computing machine network.Topology refers to the physical constellation of computing machine web constituents and overseas telegram connectin between them.The topology of web is the graphical, pictural representation of a network.Ther are assorted topology in computing machine networking but most common web topology are-
- Bus topology
- Ringing topology
- Tree Topology
- Mesh Topology
- Star topology
The coach is simple, dependable in really little web, easy to utilize and easy to understand. Use Less overseas telegram.But the advantage is if anchor interruptions whole web down. And hard to insulate job. For the constabulary section coach topology is non suited due to some obstruction. In the ring topology each computing machine is connected to the web in a closed cringle or ring. In the ring informations velocity is high.No hit due to one manner signal passing. But In the ring topology require more overseas telegram so others. Ringing topology can be implements but a interruption in the ring will interrupt down the web so it is non perfect chose for the web.
Mesh topology can be suited for the constabulary section LAN web but the chief obstruction is that it ‘s really expensive and commanding is really hard. If the service of the mesh topology is down. It is really hard to recover. So mesh topology is non ideal for the constabulary section.
In the star topology each Personal computer is connected to a cardinal hub. Where ‘s each Personal computer on the web a have a point to indicate connexion to the cardinal hub. All of the traffic which transverses the web passes through the cardinal hub. The hub Acts of the Apostless as a signal repeater. Advantage of star topology Easy to add constituent as web expends. One overseas telegram failure does non interrupt down full web. Cardinal hub provides centralised direction.Easy to happen job for faster solves. but If the cardinal hub fails, the whole system is will interrupt down. Requires more overseas telegram.For the better public presentation and to add more component star topology is expanded to widen star topology.Where 2 or more leading topology adds to a cardinal star topology and organize a drawn-out star topology.For the constabulary section LAN web extended star topology will be perfect and dependable because it provides centralize direction.
Advantage and disadvantage of web medium
To guarantee the better public presentation of web for Police section web we have to take a good medium for interconnectedness between different subdivision. There are so many types of web medium that are used in different facets. Network medium are decided in term of there transportation rate, flexibleness, cost, web facet and how easy to keep. Some mediums are describe below-
Coaxial overseas telegram: The oldest signifier of media is the coaxal overseas telegram. The coaxal wires are much dilutant and insulated by paper or fictile insularity.The most advantage of coaxal overseas telegram is it is economical and comparably well-organized and easy to put in.But care cost of coaxal overseas telegram is really high. Because it tend to blame rapidly and reassign rate is non to high. The transportation velocity of coaxal overseas telegram is.
Twisted brace overseas telegram: – Twisted brace overseas telegram is a LAN overseas telegram that can be use to link computing machine in a LAN. There are two type of distorted brace overseas telegram, UTP, STP
The advantage of UTP cat-5 overseas telegram
- High bandwidth 100 Mbps
- Cheap so cat-6
- Reasonable monetary value
The restriction of UTP cat-5 overseas telegram
- Low informations transportation rate
- Limited coverage country
The advantage of UTP cat-6 overseas telegram
- bandwidth 1.2-1.5 Gbps
- Voice and informations transportation support
- Easy to put in
The restriction of UTP cat-6 overseas telegram
- Expensive so cat 5
The advantage of optical fibre overseas telegram
- Immune to electronic intervention
- Capable of covering big distance
- Capable of easing really high transmittal velocities
The restriction of optical fibre overseas telegram
- Most expensive
- Hard to put in
The advantage of UTP cat-6 overseas telegram
- bandwidth 1.2-1.5 Gbps
- Voice and informations transportation support
- Easy to put in
- Available in market
- Can run any platform
The restriction of UTP cat-6 overseas telegram
- Expensive so cat 5
Fibre ocular overseas telegram:
Optical fiber overseas telegram is designed for faster and long scope informations transportation. Fiber-optic overseas telegram can reassign informations up to 10 Gbps bandwidth. It besides make secure informations transportation. This besides overseas telegram is a good medium for high bandwidth, high- velocity, long- distance informations transmittal. Fibre ocular overseas telegram is suited for high bandwidth and long scope informations transferred.It used to link connexion from ISP to a hub/switch connexion. and outer connexion. It is really hard to Installation of fiber ocular overseas telegram and comparatively expensive, Some clip the cost is so high and several company or organisation may portion same medium.
Wireless nexus: The radio substructure allow nomadic station easy, easy to add more personal computer. Provide easy installing, no cost for telegraphing due to no usage of overseas telegram. So that easy to maintenance. But it has some job excessively band with may be low due to peer signal. Physical construction can be disrupt the signal.Cost is really sigh comparison with other media.
In this instance for the constabulary section LAN web extended star topology will be perfect and dependable because it provides centralize direction and guarantee better public presentation of the web.SO I favor drawn-out star topology. Harmonizing to our web design extended star topology can supply better public presentation.Because this topology provide better manageableness. Extended star topology designed to supply better nexus communicating. It is much easier to add computing machine in this topology without altering the under laying construction. If any parts of the web fail to work it does n’t impact other parts and it much easier to happen job and recover from the fail.
The suited medium for the constabulary section will be the Optical Fibre For the connexion from ISP and cat-6 overseas telegram for the LAN connexion of the web. Fibre ocular will used due to it has advantages over other media like Cu overseas telegram and radio. Other media can non be implemented because there will be many information that need to be protect and secure from choping. The headquarter will be connected to the ISP with the aid of Optical Fib but the internal or sub web connexions from node to node has to be copper overseas telegrams ( CAT5 or CAT6e ) because NIC ( Network Interface Cards ) have no input to Optical Fibres. And CAT6 will be the better option for it.This type of telegraphing offer great bandwidth.Cat-6 is choose due to-
Introduction: In this undertaking describe the require cyberspace services to relay the web and require bandwidth speed to run into the demand of the service and besides depict the Internet service supplier that are able to run into the demand of the section.It besides analysis the cost for the service that are have to pay the ISP. At least it recommended a ISP that are suited to function the service.
For the Police section broadband service will be best pick because broadband service provide high velocity informations transportation rate. Because broadband service guarantee the sufficient bandwidth for the surfing the Interne and ISP besides provide following service Like –
Web waiter, Mail waiter, FTP service besides available from the ISP but police section may hold secret informations and there are much possibility to stole or chop those informations and information if we setup these service in to the ISP.So following waiter will setup internally server in to the constabulary section.Other associated service like picture conferencing can be provides by the ISP.To insure the best service of the web ‘s broadband service the connexion should give so that there are no intervention and hit between other signal.
To guarantee the faster service of the web the connexion informations transfer velocity must be consider carefully. The connexion velocity for the Police section as a whole signifier 5Mbs-8Mbs dedicated connexion. Individual required velocity for 1 territory given below –
Whatever BTCL ISPs company particular bundle services offered provided: –
- Package 1 = 10 Mbps monetary value charged 50,000.
- Package 2 = 8 Mbps monetary value charged 45,000.
- Package 3 = 6 Mbps monetary value charged 30,000.
- Package 4 = 4 Mbps monetary value charged 25,000.
Harmonizing to the BTCL limited there monetary value of bandwidth is suited and cost effectual for the constabulary section. So we recommended to BTCL.
Charge for broadband service And Most of organisation like this section take the Internet connexion from this ISP and they are supplying a good and dependable service over the old ages.
Entire cost for bandwidth=30,000+13,000=43,000 BDT
Introduction: The constabulary section want to put up two manner voice communications for internal communicating so a n probe has been carry out to happen a effectual communicating system and all associated occupation that are aid to put up the communicating system, there restraint and how to over come those restriction.
An probe has been carried out to happen the effectual method for the two manner voice communicating for the constabulary section. We find that Private Mobile Radio ( PMR ) is the best suit for the constabulary section voice communicating.PMR ‘s some features are as following.
- PMR is manus portable radio communicating system
- Where communicating is half duplex. Signal can be pass one way at clip in a channel.
- Transmission controlled from base transmittal station ( BTS ) and walkie and talking picture transceivers.
- Push to speak, release to listen – a individual button imperativeness on the receiving system set opens communicating on a PMR frequence channel. “ over and out ” method.
- Coverage country is 25km radius.
Frequency: PMR use 433~447 MHz frequence and 500mW end product. Typically PMR446 largely used. In PMR 446 there are 8 channels available. Channel list of PMR frequence is given below
Bangladesh Telecom Regulatory Commission ( BTRC ) is responsible for apportioning License for the PMR frequence. To use for the frequence licence following stairss could be take-
- Submit an application signifier that is completed together with the back uping affidavits to the Commission. The application signifier and all back uping paperss will be in English.. All transcripts of original paperss e.g. certifications of incorporation,
- must certified as true transcripts by a Notary Public.
- The application will signed merely by the applier or applier ‘s authorised
- forces. The Commission militias the right to reject the application, if it is found that the information or paperss provided for in this application are untrue, inaccurate or uncomplete.
- Each applier is required to pay taka 500BDT as charge of the application signifier. And During the entry of application with all back uping paperss, the applier is required to pay a non-refundable rating fee of taka 5,000.00 BDT each application. All payments must be made in Taka within the due day of the month for payment.
- The assignment of the frequence shall be conditional on the payment of the spectrum charges for the first twelvemonth and other relevant fees specified by the Commission.
The applier will subject following papers together with the application form-
An application to the president, BTRC in his organisation ‘ s Letter
Head Pad along with the authenticated transcripts of the undermentioned paperss.
- Trade licence.
- Import enrollment certification ( IRC ) .
- Income revenue enhancement certification.
- TIN certification.
- Bank solvency certification.
- Memorandum of association for limited company
- Or Proprietorship certification for personal from notary populace.
- Curriculum vitae of a proficient individual working in the organisation.
- Every papers should be up to day of the month.
If the committee agrees to allow a licence so the applier will hold to pay 11000 BDT ( 11 thousand taka ) through wage order in favours of BTRC after issue of demand note.
The applier should read following telecom act to understand the overall regulations and ordinance of the BTRC.
- The Bangladesh Telecommunication Act, 2001 ( Act No. Eighteen of 2001 ) .
- The Wireless Telegraphy Act, 1933 ( Act No. Seventeen of 1933 ) and The
Telegraph Act, 1225 ( ActNo. Thirteen of 1225 ) , for affairs that are non covered by
the Bangladesh Telecommunication Act, 2001.
- Any Regulation/Directives/Instructions made or to be made by the
The continuance of the Licenses will in term of 10 old ages. After expiration of the 10years the License may be renewed for subsequent footings, each of 5 old ages in continuance, capable to the blessing from the Commission and to such conditions, including the payment of any fees, as may be specified herein and/or by the Commission under the Act.
Cost of puting up and runing the system and equipment cost ;
To implement the PMR we need to put up equipment and operating system this should be include should be PMR wireless receiving system device ( walkie talking picture ) , hardware, BTS, Software, and etc. To put up the BTS it might necessitate to include seller which are aids
Frequency restriction: One of the large restriction of the PMR is the hapless signaling end product. If the manus transceivers is non plenty strong to catch the signal the communicating may disrupt. The frequence of PMR may transmite signal with in 5 kilometer in radius signal can be lost if there are any large construction, Tree mountain or electromagnetic field. Other wireless interventions can be noises and distorted the frequence. and other voice signal that are create intermodulation deformation. Where if the chief signal is non plenty strong to make its or same channel is utilizing by so many so finish may disrupt the communicating.
Range Limitation: To supply a good service there are might be adequate BTS to direct and have signal.If the country geographically full of obstruction like mountain and corner the signal may non run decently.To over come this job at that place may setup adequate BTC after 10 or 12 kilometer. Building construction should be considered in this term.
Over all for the good service and to over come those restriction good and dependable equipment should put in and plan the web carefully.
For the voice communicating operation after the licences for frequence, good hold to put in minimal 5 full fledged Base Station Transceiver ( BTS ) wireless sites in countries covering each Divisional Headquarters and 3 BTS covering each District. PMR, in general, has a restriction of ~25Km ( radius ) .
An others equipment like radio French telephone that support voice communicating will be implement for the section. To implement PMR a web of Stationss are set up. These Stationss are will linked by and large utilizing land lines, throw optical fibres and point to indicate wireless are besides used. In this manner the different base Stationss are able to pass on with each other. PMR besides allows figure of users to portion a set of frequence which is done by Radio Trunking. A Trunked wireless system makes usage of several wireless channels centrally managed by a Trunked Controller to supply communicating between wireless users. When a user makes a call, the Trunked Controller automatically allocates a free channel and sends a message to the wireless units involved in the call teaching them to alter to the free channel. This means that a conversation can be made if any channel is available. Since the communicating between the wirelesss traveling on will be sensitive, Encryption is required to protect information being leaked by the usage of Scanners. Encryption modifies a voice signal utilizing a cryptography algorithm. An encoding key controls this algorithm. The encoding key is used by the transmit and receive wirelesss to enable the voice signal to be coded and decoded for both wirelesss. Therefore, all wirelesss pass oning must hold fiting encoding keys, or encoding will non work.If more scope is to covered than the frequence coverage can be increased by the usage of repeaters. A repeater can be a utile tool to increase the operating scope of a wireless system. With its comparatively high conveying power & A ; external aerial, a well-sited repeater will supply an first-class platform to hike signals beyond the scope of non-repeater webs.
The over recommendation has been given due to many advantages explained in other Undertakings but as an overview will be briefed below as the advantages of implementing the
PMR communications system:
- Provide dependable half duplex communicating
- No demand to link with public telephone or information web.
- Trusted and dependable for private usage, improved assurance.
- Associated with cost.
- Communicationss limited with in fixed set user.
Introduction: In this undertaking a Investgatioon has been carry out to happen the suited telephone system and required instrument that are need to put up the system and service available for the section and cost for the care and equipment. And recommendation for the suited sustem.
An other probe been carried out to hind the available telephone system for the constabulary section.By this probe we realize that we can put up Public Switch Telephone Network ( PSTN ) phone system that provide some of companies in our state and besides as a individual site organisation like constabulary section for internal office site telephone communicating at that place must setup Private telephone web like Private Branch exchange ( PBX ) .
In our state PSTN phone service chiefly provided by the Bangladesh Telecom Company Limited ( BTCL ) .also some other companies start to supply the service by wireless web But BTCL is the first pick for the telephone connexion.
PBXs will do connexions between the internal telephones of the organisation and besides link them to the public switched telephone web. The primary advantage of PBXs is cost nest eggs on internal phone calls. handles the circuit exchanging locally reduced charges for local phone service.
Equipment For the telephone system:
PSTN Service: To acquire the PSTN service for the department- first it should link to local exchange which will exchange it all call in and out. Local exchange equipment will installed by PSTN service supplier merely section have to installed following equipment.
- Connection from it ‘s distribution box ( DB ) by utilizing Cu overseas telegram.
- Telephone set for each connexion.
PBX Service: If the section want to utilize PBX service so they have to add excess PBX enable equipment which will exchange internal call but if they wish to exchange external call from so the machine should link to the PSTN service The node of the connexion should link to the PBX call exchanging machine and all telephone set should PBX enable that support PBX characteristic. Following equipment would be installed to back up PBX –
The PBX ‘s internal shift web.
- Microcontroller or personal computer for opportunity call processing, control and logic.
- Logic cards, exchanging and control cards, power cards and related devices that facilitate PBX operation.
- Stations or telephone sets.
- Outside Telco short pantss that deliver signals to the PBX.
- Console or patchboard allows the operator to command incoming calls.
- Uninterruptible Power Supply ( UPS ) dwelling of detectors, power switches and batteries.
- Complecting wiring.
- Cabinets, cupboards, vaults and other lodgings.
Earlier PBX installations were limited in some characteristic like to dial other extensions, to dial out sides lines, to do question call to another extension whist connected to other external call etc. But modern PBX engineering besides provide some extra characteristic that are do the engineering more popular.Some of characteristic like following
Car attender: an machine-controlled attender allows companies to be automatically transferred to an extension without the intercession of an operator.Many operator will besides offer a simple bill of fare system Like for gross revenues, imperativeness 1, for service, imperativeness 2, etc.
Automatic call distributer: Using the automatic call distribution characteristic user can make an machine-controlled directory services, where companies can be call to other by identifying or talking the letters of the employee ‘s name or a pressing a figure.
Automatic ring back is a service offered by phone companies. when a user line is busy, one has to name back every few proceedingss to look into if their line is free yet. With automatic ring back, a codification can be dialed into the telephone computer keyboard to enable pealing back.
Call Accounting: Call history System is a telecommunications package or hardware application that captures, records, and costs telephone usage events. Using this characteristic decision maker can be able to make his control over the internal web call accounting systems may be referred to as call logging systems. Call accounting systems detect outbound and inbound calls, name ring outs, call routings, abandoned calls, and other activities.
Call transportation: It ‘s a telecommunications mechanism that enables a user to reassign an bing call to another telephone or attendant console by utilizing the transportation button and dialing the needed location.
Some other characteristic besides available with the PSTN and PBX service that are hard to depict al characteristic that are do the telephone system me realistic and helpful for the voice communicating.
To put up the telephone system of the constabulary section I Investigate a scope of cost that are need to purchase and installed equipment.
PSTN connexion and service cost:
- Application cost for each connation 6000BDT
- Cabling cost 500BDT for each connexion.
- Telephone set 700BDT
- Telephone set PBX support 1500BDT
Following computation is demoing the approximative cost of set up single division cost estimation utilizing normal telephone set-
The cost of runing the system
The cost for runing the system will include the maintainance the eqipment and operator cost. Operator should keep and supervise the PBX machine to guarantee the best public presentation the system. Any job with chief connexion and in the PBX machine must be recover. The cost for runing the system will include the maintainance the eqipment and operator cost. Operator should keep and supervise the PBX machine to guarantee the best public presentation the system. Any job with chief connexion and in the PBX machine must be recover.
Recommendation for the telephoney system.
After the probe I recommendate PSTN And PBX for the telephoney system.PBX is the mordern tecniqu and latest engineering that and supply a broad scope of installation that can supply the broad scope of map are suited for the Police departmenrt. PBX is the best pick becauese it can supply following service ansd installations
It allows all employees to portion phone system lines. No excess cost.
Easily manner to reassign calls between Stationss ( Internal phones )
Setup Individual Voice Mail boxes for every employee
Network can back up up to 400 phones.
It is much easier to put in and configure than a normal place line
It is easier to pull off. Low maintaince cost
Easily connect phone systems between subdivisions and do free phone calls
The quality of calls criterion is high
Harmonizing to the upper state of affairs PBX telephone system can be implement for the constabulary section.
Detail treatment and solution of undertaking
- This undertaking describe the possible web topology fro the constabulary section and web medium to put the possible web:
- How a topologies operates in a computing machine web.
- Advantage and disadvantage of each web medium.
- A recommendation for web and medium that to be established.
- Type of cyberspace service that is required for communicating
- Connection velocities or bandwidth that fulfills the demands
- Supplying the ISPs name that is available in our state
- Recommendation of an ISP and the monetary value of this
- Probe on two manner voice communicating.
- PMR Method
- Legal demands ( allotment of frequences and licence demands )
- Restriction of PMR system
- Recommendation for PMR
- Probe on possible Telephone system.
- Required equipments for installing
- Features available with the system
- Cost of equipment, operation and care of the system.
Require Internet Connection for the service.
Licenses, equipment cost and cost of puting up and runing the system
Report on how to do a web of constabulary section
The purpose of this undertaking is to specify the whole web structured. That is used to run a individual site organisation like constabulary central offices. To do a big web there are batch of things that need to run. Government blessing must necessitate when a large web is created including legal demands. For doing this webs of constabulary section, topology, media, connexion velocity, PMR methods and the telephone system all the things that are clearly defined.
Topology and media for the web:
Our purpose is implement a computing machine web which is surrender 100 kilometer and the web is divided into for territory one decision maker section one investigator section. Each territory has eight computing machines. In detective section have 22 computing machines and administrative section has six computers.They all are communicated with in one another in this web and linking around the universe via interne.The Police section of Twinsville has been restructure and shortly opening a new central office edifice. The headquarter will hold all the communicating and computing machine system that will assist the Police section. To take a best web topology for the in house web ( LAN ) for the Police section following probe have been carried out.
Internet connexion demands
In this undertaking describe the require cyberspace services to relay the web and require bandwidth speed to run into the demand of the service and besides depict the Internet service supplier that are able to run into the demand of the section.It besides analysis the cost for the service that are have to pay the ISP. At least it recommended a ISP that are suited to function the service. To guarantee the faster service of the web the connexion informations transfer velocity must be consider carefully. The connexion velocity for the Police section as a whole signifier 5Mbs-8Mbs dedicated connexion.
Method of constabulary section for two manner voice communicating:
An probe has been carried out to happen the effectual method for the two manner voice communicating for the constabulary section. We find that Private Mobile Radio ( PMR ) is the best suit for the constabulary section voice communication.The coverage country of PMR is limited and communications on a individual channel. To utilize PMR must be permission from appropriate government.vent from acquiring captured by Scanners.
To utilize PMR legal demands must be achieve. The legal demands are given in the above.
Telephone system for constabulary section:
An other probe been carried out to hind the available telephone system for the constabulary section.By this probe we realize that we can put up Public Switch Telephone Network ( PSTN ) phone system that provide some of companies in our state and besides as a individual site organisation like constabulary section for internal office site telephone communicating at that place must setup Private telephone web like Private Branch exchange ( PBX ) .PSTN connexion and service cost: Application cost for each connation 6000BDT.Cabling cost 500BDT for each connection.telephone set 700BDT.Telephone set PBX support 1500BDT
- Cat six will be provide faster informations velocity.
- Data will code when transportation.
- There will no intervention for voice communicating.
- There no obstruction for telephone system.
- Telephone communicating will be safe from the PSTN exchange.
- hypertext transfer protocol: //www.btrc.gov.bd [ 12/1/10 ]
- hypertext transfer protocol: //www.btcl.gov.bd [ 15/1/10 ]
- hypertext transfer protocol: //www.bol-online [ 15/1/10 ]
- hypertext transfer protocol: //www.wikipedia.com [ 20/12/09 ]
- hypertext transfer protocol: // www.amazon.com