Physical Topology And Logical Topology Computer Science Essay

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The term bus is derived from bus bar that data travels from computer to its required location. The data transmit that data cross on the cable in the form of electronic signals. On logical bus, all connected computer receive them. At each end of the bus is a terminator, to stop the electrical signals reflecting back from the end of the bus. In a logical bus environment, if one computer fails, it has no effect on the rest of network. But only one computer at a time can send information successfully. Every node has equal priority. Different two nodes has data send at the same time, that data will be lose or crush and impossible to read. The CSMA/CD access method use to reduce when that collision occur, which forms the basis of the Ethernet LAN technology, standardized in IEEE std 802.3.

In ring topologies, a node can only transmit data using the token. Token passing is one method for sending data around the ring, that standardized in IEEE std 802.5. If a computer has information to send, it modifies the token, adds address information and the data, and sends it around the ring, until it reaches its destination or returns to the sender. When the intended destination computer receives the information, it returns a message to the sender to acknowledge its' safe arrival. The sender then releases the token and sends it around the ring to begin the process again. In logical ring topologies, if a one computer fails, the rest of network will be fails.

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Figure 2

iii).Star Topology

Star topologies is a centralize management topology, because of the problems in troubleshooting and managing a physical bus or ring network, and because a single cable failure can bring down the entire network, these topologies have been largely replaced by the physical star. The physical star topology doesn't specify how signals should travel from computer to the rest of computer, only that cables connect computers to a central computer or device. But that central computer or device is fails, the rest of the network will be fails. In fact, the underlying logical topology, in a physical star is likely a bus, a ring, or switching.

Figure 3

iv).Mesh Topology

A mesh network topology is the most faults tolerant but also the most expensive. Connecting each device in a network to every other device in the network creates a mesh network topology. Any single cable or device failure in a mesh configuration affects network performance only minimally because of multiple connections to each device. Mesh topology have method that how many connecting use in the network;

Cn=number of connection

N=the number of nodes on the network.

Figure 4 Mesh Topology

v).Wireless Topologies

Wireless topologies are no cables to run, terminate, and test. Wireless networking has logical topology associated with it and, a physical topology. Two computers can communicate directly with one another, sometimes called peer-to-peer topology. This is usually used only in small or temporary installations. Wireless LANs use a central device, called an access-point (AP), to control communication, like a star physical topology because all the signals travel through one central device. Because only one wireless device can communicate with an access point at a time, It's use method a logical bus topology. Wireless mesh topology (based on IEEE 802.11) can access simultaneously at each nodes. Because node can connect to near access point at wireless mesh topology, but that's topology must have two or more access-point.

Figure 5

vi).Switched LAN Topologies

Switched LANs are referred to as full duplex LANs; each node can transmit to one destination while receiving from another destination. The access method used in switched LANs is dependent only on negotiating a path through the switches will generally provide some degree of buffering to allow incoming frames to be stored until a destination node becomes free to receive. Switching are used with both Token Ring and CSMA/CD LANs.

Figure 6

Task-1(b)The Advantages and Disadvantages Of Each Medium

The three type of medium of networking over the world;

a). Copper Wires

b). Fiber Optic

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c). Radio Transmission Media

a).Copper Wires

Copper wires have following cables types;

Coaxial Cable

1. Thick Coaxial

2. Think Coaxial

Twisted-pair Cable

1. UTP

2. STP

:: Advantages ::

-Low Cost.

-In Twisted-pair cable, It is easy to install and use for private LAN.

- To resistance to electronic pollution like EMI(electromagnetic interference) and RFI(radio frequency interference).

-UTP-Cable get high speed data transfer rates at Cat7 (2000Mbps). It's near the fiber-optic's data transfer rates.

-Can use method 10 base 2, 10 base 5, 10 base T.

:: Disadvantages::

-Limited cables ranges.

-In UTP-Cable, It will be unfixed if talking to more than one computer by going through a switch or hub.

-For the long range cabling, it's difficult to troubleshooting and repairing.

-Can be occur a problem (e.g Attenuation, Cross-talk, Eavies dropping,Echo).

-Easy to tap.

b) Fiber-Optic Cable

Fiber-Optic cable has two types:

(i)Glass (Single mode)

(ii)Plastic (Multi mode)

:: Advantages ::

-High speed.

-Long distance (e.g connect one country to other country).

-More capacity (e.g large file sizes can travel on fiber-optic cable).

-Environmental protection.

-Reduced Size and weight.

-No crosstalk.

-Difficult to tap.

:: Disavdvantages ::

-High cost.

-Can be occur attenuation.

-Low available (fiber optic connections are not available in many areas).

-Its' difficult to security of troubleshooting and repairing for around of long distance connection.

c) Radio Transmission Media

The most commonly used frequencies for wireless data communications;

-Radio wave

-Microwave

-Infrared

:: Advantages ::

-No cables needed.

-Multiple channels available.

-Wide bandwidth

-In radio wave, that can be travel around the earth.

-In microwave, that passes through the ionosphere, so are suitable for satellite to earth transmission.

:: Disadvantages ::

-Can be occur attenuation. So need repeater station.

-Line-of-sight will be disrupted if any obstacle, such as new buildings, are in the way.

-Expensive for tower.

-Need special aerials to receive the wave.

Task-1(c)Recommendation

I would like to recommend about medium, would to use UTP cable of cat6. That cat6's cost is cheaper than other medium types. That's data transfer rates (1000Mbps) near fiber-optic cable's rates. That cable is easy to install and configure for LANs network. UTP cable of cat6's speed is 600MHz, that's speed enough to use such as backbone cable and can use 1000 base TX method for LANs network. Because of our network have only 56 workstations. So I recommend this cable. I would like to recommend about topology. That topology is switching implemented as a physical star. Switching is neither a bus nor a ring logically, but is always as a physical star. That topology can use both Token Ring and CSMA/CD method. Multiple computers can communicate simultaneously without affecting each other. If we use smart switch device, we can manage with special order to each node, that device easy to configure. Another fact, that device fail, the rest of network will be fails. But we can easy to install again without loss time.

Figure 7

TASK-2

Task-2(a).Internet Service

'An Internet is a collection of networks and routers that span most countries and uses the TCP/IP protocol to form a single virtual network.' (Enterprice Networking Third Edition, NCC Education Limited, 2007, pg-178)

Internet Service Standard defined in the same way as the basic underlying TCP/IP infrastructure. Internet Service has generally three concepts. That are Information, Communication and Transferring.

The most important for the Police Department, these service are E-mail (something like g-mail, hotmail), File Transfer Protocol (FTP), Voice over IP(VoIP, Video Conferencing), WWW(World Wide Web).

Communication

E-mail That actually needed for our department. Because that can connect all over the world(internet connection available) by email. That email charge fee is really light.

VoIP (Voice over IP) That it is need for patrolling case and video conferencing. Using VoIP, We can connect the all workstation (Internet connection available) and every nodes(one or many simultaneously) at head office.

Transferring

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FTP (File Transfer Protocol) That FTP is an Internet protocol designed to make the copying of files from one computer to another convenient and efficient. FTP is useful for retrieving information from Internet archives. A great deal of software is also available free of charge from archives, including large-scale applications and even full Operation Systems. Binary files (for example program files) are transferred in a byte by byte fashion.

Information

WWW (World Wide Web) The World Wide Web service brings several Internet protocols together and allows them to be used and accessed by the user in a common fashion. The protocols that are unified in this way are:

-telnet; -ftp; -newsgroups; -WAIS(Wide Area Information Servers) -a tool for searching indexes; -gopher (a tool for browsing Internet resources).

And available many service.

Task-(b).

Internet connection is

(1) Dial-up Internet Access

(2) Broadband

1).Dial-up

Dial-up Internet access is a form of Internet access that uses telephone lines. The user's computer or router uses an attached modem connected to a telephone line to dial into an Internet service provider's (ISP) node to establish a modem-to-modem link, which is then used to route Internet Protocol packets between the user's equipment and hosts. Dial-up modems are limited less than 56 Kbps.

2).Broadband The Broadband connection is sometime call "high speed" connection, because has a high rate data transmission. The International Telecommunication Union Standardization Sector (ITU-T) recommendation I.113 has defined broadband as a transmission capacity that is faster than primary rate ISDN, at 1.5 to 2 Mbps. The Organization for Economic Co-operation and Development (OECD) has defined broadband as 256 Kbps in at least one direction and this bit rate is the most common baseline that is marketed as "broadband" around the world. That's connection has many method to connect to Internet.

-ADSL -Wireless (WiMax) Internet Access -Satellite Internet Access (There are popular technology in my country) and etc.

Internet Connection Speed for Following Services

The internet connection speed will be need 64 Kbit/s for Email service and VoIP service, but recommend 512 Kbit/s.

For FTP service, 128 will be adquate, 1Mbit/s is perferable.

For WWW(http,https) will be 256 Kbit/s is good enough for normal site. But recommeded is 1 Mbit/s.

So, We'll need 2 Mbit/s for all Internet services.

Task-2(c)Internet Service Providers

Our country has two ISP(Internet Service Provider). That's are

-MPT (Myanmar Posts and Telecommunications) and

-MyanTel (Myanmar Teleport).

Myanmar Posts and Telecommunications (www.mpt.net.mm)

The Myanmar Posts and Telecommunications (MPT), is the sole provider of telecommunication services in Myanmar. It is a Government Agency, operating under the Ministry of Communications, Posts and Telegraphs.They can support that Internet Service Access Line, Broadband ADSL Line.

Myanmar Teleport (www.myantel.net.mm)

It started off with a dream. One that would the entire country the best in info-communication, by being the provider that would take the people of Myanmar into Cyberspace. And now this dream is becoming reality through a team of young and dynamic characters that make up Myanmar Teleport. They can support that Internet Service Access Line, Broadband Lines and VoIP Service and FTP and E-Mail Service.

Task-2.(d)Recommendation

I want to recommend to uses ISP in our country. Myanmar Teleport and Myanmar Post and Telecommunication support internet access service. They can support following internet access service;

That is Myanmar Teleport's Internet Access Service and Other Service and Charges;

That is Myanmar Post and Telecommunication' Internet Access service and Charges;

Broadband ADSL Service

I would like to recommend and use the two type of broadband lines. That lines are ADSL Broadband and Satellite Broadband line.

I would like to use two broadband ADSL, deal with MPT, because their charges is cheaper than Myanmar Teleport. That broadband ADSL line speed is up to 2Mbps. Ipstar broadbrand satellite lines with deal Myanmar Teleport. That broadband satellite line is weather proof, and that's speed is up to 384(Mir). We should use Internet Load Balance software in server machine.

That 2 Mbit/s and 384(Mir) is suitable for our Internet services requirement.

Task-3

Task-3(a) Two Way Voice Communication Method

GSM (Groupe Special Mobile)

TETRA(European Telecommunication Standard Institute)

DECT(Digital Enhanced Cordless Telecommunication)

-GSM

GSM (Global System for Mobile communications: originally from Groupe Special Mobile) is the most popular standard for mobile phones in the world. GSM differs from its predecessors in that both signaling and speech channels are digital, and thus is considered a second generation (2G) mobile phone system. This has also meant that data communication was easy to build into the system. GSM EDGE is a 3G version of the protocol. GSM uses the full duplex communication method. But we can use PTT(Push-To-Talk) service, that use half duplex communication method. So that's use both communication method.

GSM frequencies

GSM networks operate in a number of different frequency ranges. Most 2G GSM networks operate in the 900 MHz or 1800 MHz bands. Most 3G GSM networks in Europe operate in the 2100 MHz frequency band. The rarer 400 and 450 MHz frequency bands are assigned in some countries where these frequencies were previously used for first-generation systems. GSM-900 uses 890-915 MHz to send information from the mobile station to the base station (uplink) and 935-960 MHz for the other direction (downlink), providing 125 RF channels (channel numbers 1 to 124) spaced at 200 kHz. Duplex spacing of 45 MHz is used.

-TETRA

TETRA is a two-way transceiver specification. TETRA is an ETSI(European Telecommunication Standard Institute) standard. TETRA works in a very similar way to GSM. The common mode of operation for them is in a group calling mode in which a single button push will connect the user to the users in a selected call group and/or a dispatcher. If enabled by the Subscriber Management TETRA terminals can act as mobile phones (cell phones), with a full-duplex direct connection to other TETRA Users or the PSTN. TETRA could use both the half duplex and full duplex communication.

TETRA Frequencies

TETRA uses Time Division Multiple Access (TDMA) with four user channels on one radio carrier and 25 kHz spacing between carriers. Both point-to-point and point-to-multipoint transfer can be used.

-DECT

The DECT standard fully specifies a means for a portable unit, such as a cordless telephone, to access a fixed telecoms network via radio. But, unlike the GSM standards, does not specify any internal aspects of the fixed network itself. Connectivity to the fixed network (which may be of many different kinds) is done through a base station or "Radio Fixed Part" to terminate the radio link, and a gateway to connect calls to the fixed network. In most cases the base station connection is to the public switched telephone network or telephone jack, although connectivity with newer technologies such as Voice over IP has become available. The enterprise PABX market had some success, and all the major PABX vendors have offered DECT access options. DECT could use both half duplex and full duplex communication method. That's can use multiple communication method (one to one, one to many, many to many).

DECT Frequencies

Frequency: 1880 MHz-1900 MHz in Europe, 1900 MHz-1920 MHz in China, 1910 MHz-1930 MHz in Latin America and 1920 MHz-1930 MHz in the US and Canada

The DECT physical layer uses:

Frequency division multiple access (FDMA),

Time division multiple access (TDMA) and

Time division duplex (TDD)

Task-3. (b)Legal Requirement

Our country's MPT(Myanmar Post and Telecommunication) supports mobile communications mapping. They allows DECT(Digital Enhance Cordless Telecommunication) technology.

We can use cordless phones with DECT technology.

Allocation Frequencies

Seven frequency bands have been allocated by the Federal Communications Commission for uses that include DECT and cordless phones. These are:

1.7 MHz (1.64 MHz to 1.78 MHz & up to 5 Channels, AM System)

43-50 MHz (Base: 43.72-46.97 MHz, Handset: 48.76-49.99 MHz, allocated in 1986 for 10 channels, and later 25 Channels, FM System)

900 MHz (902-928 MHz) (allocated in 1990)

1.9 GHz (1880-1900 MHz) (used for DECT communications outside the U.S.)

1.9 GHz (1920-1930 MHz) (developed in 1993 and allocated U.S. in October 2005)

2.4 GHz (allocated in 1998)

5.8 GHz (allocated in 2003 due to crowding on the 2.4 GHz band).

The recently allocated 1.9 GHz band is used by the popular DECT phone standard and is considered more secure than the other shared frequencies. Most manufactory claim a range of about 30 m (100 ft) for their 2.4 GHz and 5.8 GHz systems, but inexpensive models often fall short of this claim.

MPT allow frequency is 2.4 GHz for DECT method in our country.

Licensing Requirement

Licensing requirement has no need for our technology and requirement because our police organization is under the main gorverment force.

Task-3(c)Cost of Setting up and operating the system

I would like to use DECT method with DuraFon PRO products by EnGenuis Corporate Company. That is DuraFon PRO Base Station, DuraFon PRO Base Unit, DuraFon PRO Handsets. That products used DECT method.

EnGenius Corporate Company's DuraFon PRO Products

Figure 8 EnGenius's Long Rand 4+Line/Port(PRO)

DuraFon PRO Base Station, Base unit and Handset. And their Feature and Range

Figure 9 EnGenius' DuraFon PRO Base station and one Handset

That's device work on 900MHz.

Figure 10 Dura Fon PRO Handset

Setting up and operating the system costs

Equipment Cost (Overall)

One Base Station (DuraFon PRO BaseStation) = 2000 USD (That for main equipment for DECT method)

28 Stand Handset Unit (DuraFon PRO Handset) = 28 * 200 = 2800 USD (That for each district police patrolling car and Serious Crimes Squad's car)

13 Walkie Handset(DuraWalkie ) = 13 * 100 =1300 USD (That for patrol police)

4 Repeater ( Miscellaneous) = 4 * 180 = 720 USD (That for coverage)

Total Equipment Cost = 5820 USD

Licensing Costs

Licensing costs is no need for our project. Because our orginazation is under one of the gorverment agency.

Installation Costs

EnGenuis company would provide to install their products(that costs may be 200 USD).

Configuration Costs

Configuration Costs = 300 USD

General Costs

General Costs = Shipping Charges + services Charges

= 300 USD + 200 USD = 500 USD

Total Setting Up Costs

Total setting up costs = (Total Equipment Cost + Licensing Costs + Installation Costs + Configuration Costs + General Costs)

= ( 5820 + 200 + 300 + 500 )USD = 6820 USD

Task-3(d) Limitations of each method

-Limitations of GSM

Pulse nature of TDMA transmission used in 2G interferes with some electronics, especially certain audio amplifiers. 3G uses W-CDMA now.

GSM has a fixed maximum cell site range of 35 km, which is imposed by technical limitations.

Intellectual property is concentrated among a few industry participants, creating barriers to entry for new entrants and limiting competition among phone manufacturers.

GSM hasn't got a spread spectrum technology, the data packets are not coded appropriately thus loss of data.

-Limitations of TETRA

requires a linear amplifier to meet the stringent RF specifications that allow it to exist alongside other radio services.

handsets are more expensive than cellular. This is due to the more difficult technology, smaller economies of scale, and different business model.

data transfer is efficient and long range (many km), but slow by modern standards at 7.2 kbit/s per timeslot (3.5 kbit/slot net packet data throughput), although up to 4 timeslots can be combined into a single data channel to achieve higher rates whilst still fitting into a single 25 kHz bandwidth channel.

-Limitations of DECT

Net bit rate: 32 kbit/s, that low for data communication.

Interference wireless operation to around only 100 metres outdoors. Operates clearly in common congested domestic radio traffic situations. For instance, generally immune to interference from Wi-Fi networks or video senders, Bluetooth technology, baby monitors and other wireless devices.

Additional handsets usually have a battery charger station instead of a base station.

enterprise premises cordless PABXs and wireless LANs, using many base stations for coverage. Traffic both within the system and to the public telecoms network.

public access, using large numbers of base stations to provide building or urban area coverage as part of a public telecoms network.

Must be using directional antennas and sacrificing some traffic capacity, cell coverage could extend to over 10 km.

Task-3(d)Recommendation For Voice Communication

I would like to use DECT technology and Cordless phones for our police organization's two way voice communication.

I have some reason for DECT technology. DECT technology, domestic cordless telephony, using a single base station to connect one or more handsets to the public telecoms network. Multiple handsets to one base station and one phone line socket. This allows several cordless telephones to be placed around the house, all operating from the same telephone jack. Additional handsets usually have a battery charger station instead of a base station. The additional handsets do not require additional telephone sockets or additional transceivers. An extended range between the telephone and base. Main reason is, Ability to make internal (intercom) calls between handsets.

Reason for cordless phones. Almost Cordless phones can make multiple access modes and multiple function ( one to one, one to many ). That phone use both half duplex and full duplex communication method.

Setting up and run

I would like to use one DuraFon PRO Base station and twenty eight DuraFon PRO Stand Handsets and thirty DuraWalkie and four Repeaters(Miscellaneous) by EnGenius Coorporate Company.

I have some reason for DuraFon PRO Base station. That's base station can avialable long range cordless phone system, up to 3000 acres on a farm or ranch. 250,000 square ft in a ware house or retail store, that coverage is enough for our cover area. And ability to broadcasts to handsets from another PRO Handsets or DuraWalkie Handsets directly. And multiple PRO Handest connect with it up to 90. Expandeble to 8 base units. That's behind can connect with telephone line, so we can call from PSTN to another extranal phone. That' device can easy to install.

I want to recommend DuraFon PRO (DuraFon 4x handset). That handsets will well work with DuraFon PRO Base station. And up to connect with 90 handsets(DuraFon PRO Handsets,DuraWalkie Handset). Two way radio function: full duplex intercom or half duplex broadcasts. And stand handset is need for patrolling police cars and Serious Crimes Squad cars.

Repeaters(Miscellaneous) is need, because frequencies can occur attenuation when that is pass high buildings and think walls. So we can need repeater for coverage.

Another reason is they(EnGenius) can support many service: including device installion, after sell service, and they can give to us device training course(technical support). And price is reasonable price for equipments. So I want to run this style, and deal with EnGenius Corparate Company for our two way voice communication.

Fig 3. Two Voice Communication set up

TASK-4

Task-4(a) Telephone Systems For Single-Site organizations

The every Main equipment use each core system, that are two kinds of style

PBX (that use circuit switched method)

IP-PBX (that use packet switched method)

PBX(Private Branch Exchange) System

A Private Branch Exchange is a telephone system or telephone exchange that serves particular office or business, as opposed to one that a common carrier or telephone company operates for many businesses or for the general public. The PBX phone system share and separate a number of outside lines for making external phone calls. A PBX connects the internal telephones within a business or office and also connects them to the public switched telephone network (PSTN) via trunk line. Because they incorporate telephones, fax machines, modems, and more the general term "extension" is used to refer to any end point on the branch. PBXs are also referred to as:

PABX - private automatic branch exchange

EPABX - electronic private automatic branch exchange

One of the latest trends in PBX development is the VoIP PBX, also known as an IP-PBX or IPBX, which uses the Internet Protocol to carry calls. Most modern PBXs support VoIP. ISDN PBX systems also replaced some traditional PBXs.

PBX's are competitive in services with modern IP Hosting. They are four types concept;

PBX(Private and Circuit switched)

Hosted PBX(Hosted and Circuit switched) or traditional Centrex

IP-PBX(Private and Packet switched)

Hosted IP(Hosted and Packet switched)

Hosted PBX System

Hosted PBXs are typically provided by the telephone company, using equipment located in the premises of the telephone company's exchange. A hosted PBX system work on PSTN or the Internet, and available services as PBX functionality. That mean PBX user doesn't need to buy or install PBX equipment. Centrex is like hosted PBX system, that was provide from telephone company.

IP(Internet Protocol)- PBX System

IP PBX is use underlying Internet protocol for voice signals and non-voice signals, bringing benefits for computer telephony integration (CTI). An IP-PBX can exist as physical hardware, or can carry out its functions virtually, performing the call-routing activities of the traditional PBX or key system as a software system. The virtual version is also called a "Soft PBX". IP-PBX system need to configure other devices( such as IP-PBX Base Station, or Integrated Server, etc). The basic architecture of an IP PBX system consists of an IP PBX server, one or more SIP phones or VoIP phones, and a VoIP gateway, as mentioned already, to connect to the ISDN lines or the existing PSTN lines (optional though). The IP PBX server functions quite similar to a proxy server. The SIP or VoIP phones, which can be either hardware

ISDN IP-PBX

ISDN IP-PBX means that IP-PBX is used with ISDN line. That mean, that IP-PBX system is used end-to-end digital signal transmission to support a wide range of services.

IP-Phone

IP phones use VoIP technologies allowing telephone calls to be made over an IP network such as the internet instead of PSTN or ISDN system. Calls can traverse the Internet, or a private IP Network such as that of a company. The phones use control protocols such as SIP (Session Initiation Protocol), SCCP (Skinny Client Control Protocol). IP phones can be simple software-based softphones or purpose-built hardware devices that appear much like and ordinary telephone or a cordless phone.

Figure 11 IP-PBX system

Figure 12. Work with ISDN line and IP-PBX

Suggestion

I would like to use ISDN line and IP-PBX device for our project's telephone system, especially for VoIP (including SIP, Jingle (extension of XMPP protocol introduced by Google Talk), and other) method and IP-Phone.

So, the main equipment is IP-PBX device. I want to install that device using ISDN Line and IP-phone.

Task-4(b) The Features of Each System

PBX System Features

The PBX Common Features are;

Auto attendant

Auto dialing

Automatic call distributor

Automated directory services (callers are routed to a given employee by keying or speaking the letters of the employee's name)

Automatic ring back

Call accounting

Call forwarding on absence

Call forwarding on busy

Call park

Call pick-up

Call transfer

Call waiting

Camp-on

Conference call

Custom greetings

Customised Abbreviated dialing (Speed Dialing)

Direct Inward Dialing

Direct Inward System Access (DISA) (the ability to access internal features from an outside telephone line)

Do not disturb (DND)

Follow-me

Interactive voice response

Music on hold

Night service

Shared message boxes (where a department can have a shared voicemail box)

Voice mail

Voice message broadcasting

Voice paging (PA system)

IP-PBX System Features

We can available many service of IP-PBX, that are common features,

-VoIP ready, can use IP-Phone

-Unlimited Extensions

-Unlimited Auto Attendants

-Unlimited Voicemail Boxes

-Cell Phone Integration

-Integrated Paging

-Remote Phones

-Advanced User Interface (including Find me/Follow Me, Unified Messaging, Call recordings, Voicemail .wav).

-Extension Groups

-Extension Range Flexibility

-Caller ID Customization

-DID (Direct Inward Dialing)

-Time of Day Routing

-Extension Call Recording

-On the Fly Recording

-Call Return

-Voicemail Callback

-Voicemail to Email

-SMS Voicemail notification

-Voicemail Web Access

-Voicemail Bypass

-Intuitive VoIP Ready

-Voicemail Blast Groups

-VoIP Ready

-Inbound Call Description

-VoIP Compression

-Outlook Integration

-Call Out

-Call Pickup

-System Diagnositcs

-Multivendor Phone Options

-Analog Phone Support

-Call Parking

-Call Barge

-Dial by Name Directory

-Powerful Reporting

-Remote Linked Servers

-Operator Console

-Custom Routing Rules

-Conference Rooms

-Outbound Dial Map

-Speed Dial Numbers

-Channel Bank Support

-Multiple Music on Hold

-Analog and Digital Ready

-PSTN or Digital Failover

-NIS Routing

-Advanced Routing (IVR)

-Fast Pass

-Caller Position Notification

-Call Whisper

-Auto call forwarding

-Unified Messaging

-Call Screening

-Enhanced Mobility

-Overhead Paging

-Custom VoIP Provider

-Professional Development

-Fax Support

-Fax to Email

-Fax PDF Support

-Click to Dial

-Softphone

-Call Transfer

-call Conference

-Live Monitoring

Hosted PBX System Features

Task-4(c)Cost of Equipment and Installation

Cost Installation

Cost of PBX System

Cost of Main PBX equipment = ( 900 to 1500) USD

Cost of Phone (for use with PBX) = (50 to 200) USD

Cost of Hosted PBX System

Cost of contract with telephone company =

Cost of IP-PBX System

Cost of Main IP-PBX Server equipment = (900 to 3000) USD

Cost of IP-Phone (for use with IP-PBX) = (100 to 400 ) USD

Cost Installation

Cost of Installation (For PBX system) =

Cost of Installation (For IP-PBX system) =

Cost of Installation (For Hosted PBX system)

The telephone company provides for equipment installation.

Task-4(d) Cost of Operation the System

Telephone System equipment Cost(IP-PBX Server, IP-Phone) =

Medium Cable cost (UTP cat 6) =

Installion Cost =

Configuration Cost =

Task-4(e) Recommendation for Telephone System to Purchase

I want to purchase IP-PBX system for our telephone system, that's can get many services(such as voice conferencing and unlimited extension, etc) than other telephone system. Most telephone company can provide IP-PBX system. That mean we can get(services easily to install and maintain). And we can get update features and rich services.

Now a day, IP-PBX system can replace traditional PBX system. The IP PBX is also able to connect to traditional PSTN lines via an optional gateway. All conversations are sent as data packets over the network.That can connect with LAN and the Internet.

I have some reason for IP-PBX system. That can use their features on that system connect with LAN connected computer('softphone'). And any one who knows the basics of computer and networking can install the IP PBX in a PC and maintain it reasonably well. Adding more phone lines or extensions often requires expensive hardware modules. We can get hot swap(plus and play) function, that function is everyone can easy to install for new phones or connect to the PC. Another reason is IP-PBX system is low costs for operation, the calls make use of IP networks, even long distance international calls are many times cheaper. Its main difference from other system. Another positive with IP PBX is that it could easily handle any number of additional phone connections and extensions without disturbing the efficiency of the network. Bring up the emergnecy caller record of the caller automatically when reception receive his/her call.

TASK-5

Enterprise Networking Report for Police Department

Network Administrator Report

Description-Enterprise Networking For Police Department

Task(1)- In House-Network(LAN)- Switched LAN Topology implement as physical Star using UTP Cable (cat 6) for our the police Department's in-house network (LAN). That topology is reliable and faster than other LAN topologies. Those speeds can compatible with our Internet services (Task-2). Key Point

To buy Switch Device (Such as Cisco Switch Device), but that device can support Gigabit Ethernet.

To buy medium UTP-Cat 6 (calculate area of apartment).

To install that devices

And then to build and configure LAN using Switched LAN topology

So we can get over all 1000 Mbit/s LAN speed.

Assumption

We should use server machine in the network for network security and management and configuration ( such as network permission, speed).

Estimate Costs for Task-1 = 3000 USD

Task (2)-The Internet Services for Our LAN- ADSL Broadband (2Mbit/s) line is very reliability, can get high Internet connection speed for our Internet Service Requirement. IPStar satellite (384Mir) line is weather proof, and we can get Real-Time GPS (Global Positioning System) service for criminal case. Key Point

To purchase two Internet line (ADSL Broadband(2Mbit/s) and IPStar satellite(384Mir) )

Install and Connect to the server machine using related router.

And Configure the server and the LAN to use Internet Services

Assumption

We should use Internet Load Balancing Software to combine that two Internet lines speed.

Estimate Costs for Task-2 = 2000 USD + 400 USD(monthly fee)

Task (3)-The Two-way Voice Communication for Our Patrolling Case - I used DECT technology for two-way voice communication. And main fact, cordless phone can call to one or group or many. That mean when serious in Townsville, at that time police officers can call another district patrol groups using cordless phone's mode one to many. That technology is very relievable for our two-way voice communication.

Key Point

Request premise and allocation frequency from government to build wireless local loop(two-way voice communication)

To purchase main equipment(DECT base station, cordless phones and repeater)

install that devices

Configure and operate the system(such as separated district groups)

Assumption

Estimate Costs for Task-3 = 7000 USD

Task (4) - The Telephone System for Our Station- IP-PBX system can get many services (such as voice conferencing, video conferencing). That is useful for our Station's emergency meeting. Auto record that the emergency called can be record automatically to IP-PBX server. IP-PBX system is very efficiency for our system. That system is easy to install and configure the system.

Key Point

Firstly apply ISDN line or PSTN Phone line from telephone service provider.

To purchase main equipment IP-PBX severs, IP-phones or SIP-Phones.

To buy medium UTP-Cate 6 Cable

Install the equipment and the cable and the phone lines.

Configure and operate the system (number of extension line and sperate key number for each department)

Assumptions

We should build Network Department to control our overall network. We can connect with main server (PC Network) and configure from the main server (PC network). We need another special PSTN line to call and received emergency case (such as '199') for reception.

Our overall network is one network because overall network work on underlying same Internet protocol (IP). We can connect and control and monitor each other (Main-Server (PC Network) can connect DECT base station and IP-PBX server). So Townsville Police Department is renewing all of its networks for the new headquarters including the computer network (switched LAN topology) , telephone communications(IP-PBX system) and two-way communications(DECT technology) with police officers who are on patrol.

Total estimate Costs =