The network requirement for the implementation

Introduction

This assignment is to show the apprehension of the web demand for the execution of a vehicle trailing and wireless communicating system for a new cab company.

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And analyzing the method available for tacking the company ‘s vehicles and compare them with client location plus the excess service that can be created from such a system. Alongside this will analyze the voice communicating systems that would be suited for such a company.

There are 5 Task in this assignment

Undertaking 1

I investigate 3 vehicle tracking system and their services

Undertaking 2

Investigate tow-way voice communicating method for the new cab company such as:

  • The method of frequence, full/half-duplex
  • Detailss legal demand of operation system in our state
  • Cost for puting and runing system, licencing cost, equipment cost
  • Restriction of each the above method

Undertaking 3

I investigate the possible web topologies and media for new cab company

Undertaking 4

Probe of security issues related to transmittal of vehicle location informations and voice communicating transmittal.

Undertaking 5

This undertaking to compose study for all undertaking

TASK -1

There are three vehicle tracking system suppliers that I would wish to look into for new cab company was:

  • V-SOL Vehicle Tracking System
  • Quartix Vehicle Tracking System
  • RAM clear and simple Vehicle Tracking System

The followers are some peculiar characteristics of each company.

V-SOL VEHICLE TRACKING SYSTEM

Tracking Method

GPS is the chief trailing method of V-SOL, which provides independent placement and timing information. Information from this system is captured, analyzed and distributed along with other utile informations.

There are two vehicle tracking system in GPS, inactive and active or real-time. The inactive shop location, velocity, heading and sometime a trigger event such as cardinal on/off, door open/close. The active besides collect the same information but they send the information in the existent clip via cellular or satellite webs to a computing machine or informations centre for rating. V-SOL usage active vehicle tracking system.

The V-SOL GPS vehicle tracking systems provide true existent clip, unrecorded GSM and GPS vehicle tracking and location in the UK and Europe.

V-SOL advanced Vehicle Telemetric, include Automatic Vehicle Location ( AVL ) , Real Time, Live vehicle tracking solutions, Data Transfer and messaging at its best. This is suited for autos, new waves, PSV, HGV, dawdlers and heavy works.

V-SOL is a different type of vehicle trailing and location merchandise. Under the bonnet of the system lie the most advanced communications and database solution of all time planned to utilize commercial.

Accuracy of the Tracking Method

V-SOL embedded engineering combined with GPS and GSM communicating hardware are the most robust and dependable vehicle tracking system.

V-SOL vehicle tracking system offers clients accurate, real-time coverage, and besides with the ability to reach drivers at any clip, show precisely place where they are.

Maps are to the full scalable from continent, state, part, even a user-defined country or down to about demand truth ( 30ft ) at street or even constructing degree if necessary! Equally good as turn uping vehicles either separately or jointly extra information can be provided aboard maps. Maps can even to demo client and client ‘s locations, occupations, particular landmarks and even edifices.

And Playback tool provides to see or reexamine where vehicles have been. It is possible know non merely where, who and when but besides precisely how a peculiar vehicle performed over every clip. Playback is the tool to utilize for the turning away of uncertainties and will supply client with aid client even in legal state of affairss.

Route – planning tool. It can look into the exact distance and clip it should take to finish a peculiar path within merely a few seconds. It can take advantage of all information recorded by the vehicles as they go about the concern to supply over clip an limitless paths database.

Live tracking system provides absolute existent clip aid giving the drivers total back up when on the route. Customers will have more timely information no affair what the state of affairs is.

Information Delivered By the Tracking System

Reports of drivers interrupting the velocity bound, driving for longer than the 10 hr a twenty-four hours upper limit, overloading and holding unroadworthy vehicles were highlighted in intelligence studies, with the Transport Select Committee naming for brushing alterations to better safety.

Information transmitted From Vehicle to Central Control System

The system can be set to turn up single or groups of vehicles at regular clip intervals, from day-to-day, hourly, minute-by-minute updates or on an ad-hoc footing. Every piece of information that has of all time been captured by V-SOL can be taken advantage in studies.

Method of Data Transmission from Vehicle to Center

Methods for informations transmittal are GSM based. By uniting received informations from the Vehicle Tracking system and the other detectors, it is possible to organize a profile of driving manners for any given period. If driver Idaho is used so this information can be collated across multiple vehicles.

Cost per Vehicle per Day of Using the System

V – SOL usage Pay as you go tracking system. The systems are available to purchase or lease

  • ?795 for an straight-out purchase
  • Less than ?1.00 per twenty-four hours for system rental

Additional Service That the System Can Provide

V-SOL launches remote vehicle tracking system with that they offer clients entree to their category taking engineering via astandard cyberspace browser. V-SOL is delighted to add this new merchandise V-SOL Remote.Net T to the esteemed V-SOL scope at the beginning of October 2006.

V-SOLCentral remainsthe company PremiumReal TimeClient Server Platform whilst besides supplying thefeed to V-SOL Remote.Net Live tracking through the webfrom anyplace in the universe at any time.V-SOL Remote.Net besides provides information on the current advancement onthe twenty-four hours activity along with existent clip entree to detailed daily and hebdomadal studies on times, topographic points, velocities and stat mis.

QUARTIX VEHICLE TRACKING SYSTEM

The Quartix vehicle tracking system uses GPS orbiters and the GPRS web to track new waves and supply real-time location information for the fleet. The system is wholly Internet-based, so user can entree it from anyplace. It requires no package or maps to be installed on user Personal computer, and all user demand is a web browser.

The truth of the trailing method

Quartix maintains complete ownership and control of its vehicle tracking engineering, from the vehicle terminus through to the tracking system waiters and databases.

Key to the system dependability is an architecture which has been built on mistake tolerance and active redundancy to give user peace of head that user ‘s vehicle trailing system will be dependable and available to entree from anyplace.

The cardinal characteristics of the Quartix ‘s company tracking system design include:

  • GPS vehicle trailing, utilizing the latest coevals of GPS bit engineering
  • Real-time GPRS communicating, with mistake tolerance and backup built in
  • Dual-redundant vehicle tracking waiters and database systems based

Information delivered from vehicle to center

They have Info Plus service, which provides day-to-day vehicle studies in HTML or Excel every bit good as all the real-time characteristics of Info Point, for managing of paysheet and overtime maintaining path of vehicle motions.

Easy to utilize is the key to deducing cost benefits from a trailing system, that why their merchandise development is moved towards presenting information to user in a signifier that can be integrated with user ‘s paysheet and other concern applications. In add-on to the studies that are available to user over the web, Quartix provides direction sum-ups in ‘Excel ‘ format that can assist user minimise conveyance costs and maximise end product.

Daily logs are presented in a clear and easy-to-read format. The twenty-four hours is split into separate trips and the degree of item in the study can be specified for each vehicle. Stops with the ignition on and short motions around a site can either be shown or filtered out.
Adding user ain usage reference location names is an easy undertaking – either users can make it online or they will make it for users.

Daily or hebdomadal studies from this company supply elaborate sheet for each twenty-four hours of the hebdomad for each vehicle, together with a drumhead sheet for the hebdomad as a whole. Alternatively a day-to-day study provides inside informations of each vehicle, together with a drumhead sheet for the fleet as a whole.
Mileage and gasoline use – the item and drumhead sheets provide to look into on the estimated fuel use for each vehicle which can be verified against fuel measures and compared across the fleet assisting you to track and command running costs.
Maximal velocities recorded for each trip, each twenty-four hours, and the hebdomad as a whole ; supply a utile manner of supervising driving wonts and advancing safer usage of your vehicles.
Shift times method is report automatically calculates the clip from the beginning to the terminal motion of the vehicle in each twenty-four hours. Configuration options besides allow user to stipulate displacement times to be used in the studies.
Linkss to location and path maps allow user as with the e-mail logs, the location names and trip Numberss provide direct links to maps on the company web site. So that user can rapidly and easy look into stop locations, velocities, paths driven etc.

Pricing policy

Real-time trailing for multiple users

Wage as You Go- ?19.50 autopsy

Purchase Outright – ?295

Lease – ?18.50 autopsy

Info Point characteristics, plus

Wage as You Go- ?25.50 autopsy

Purchase Outright – ?385

Lease – ?21.27 autopsy

Info Point & A ; Info Plus characteristics

Wage as You Go- ?29.50 autopsy

Purchase Outright – ?495

Lease – ?22.18 autopsy

RAM CLEAR AND SIMPLE VEHICLE TRACKING SYSTEM

Vehicle Tracking Systems
RAM vehicle tracking systems deliver existent clip and accurate information right to user ‘s desktop and give the ability to track the most valuable resources by the touch of a button. RAM vehicle tracking systems are besides often updated to do certain the information is unafraid and dependable. You can look into out even today ‘s vehicle tracking systems.

Tracker Systems

In tracker system, the expertness of the company allows to make genuinely made-to-order solutions for their clients and present the best possible service. RAM tracker systems are robust, accurate and really speedy in treating

Fleet tracking

if you want to supervise & A ; better the efficiency of your fleet so you can utilize swift tracking service. RAM fleet tracking services provide historical studies, proctors existent clip locations and private to concern milage.

Fleet Management

if your concern is running with a fleet with more than 2 vehicles, you need to utilize an effectual Fleet Management system. RAM fleet direction system will supply you to command the public presentation of your vehicles and allow you cognize where you can cut down costs. So you can better productiveness and cut down the costs of your concern.

Vehicle tracking

if you want to command the exact motions of vehicles and cut down costs so you need to utilize vehicle tracking. RAM is a taking provider of vehicle tracking systems and believed and can supply to all your demands.

The RAM Fleet Vehicle Tracking system and location systems delivers exact vehicle motions in existent clip via cyberspace to your Personal computer. And supply to increase efficiency of the clients fleets.

RAM Vehicle Tracking Systems and describing suite includes historical trailing studies covering all characteristic of vehicle activity collected by GPS. Fleet tracking devices transmit vehicle public presentation in existent clip to bring forth vehicle tracking studies.

RAM tracker system presenting vehicle history with clear and easy to understand and with user friendly format.

GPS vehicle tracking positioning guaranting you have the exact location of your vehicle fleet.

Entire fleet visibleness in the system is the figure of entire fleet control by this system.

Buyers Guide include:

  • What to look for when purchasing a vehicle tracking system solution.
  • 13 errors to avoid when you purchasing vehicle trailing.
  • Vehicle tracking pricing.
  • Benefits of Tracking Explained!
  • How to implement vehicle tracking and avoid employee opposition.

The Info Pack include:

  • Ram fleet package interface.
  • Live vehicle public presentation on RAM function & A ; package.
  • Historical trailing studies for timesheets, private milage, and clip on site & A ; spreadsheets.
  • Real-time qui vives & A ; dismaies.
  • Tracking the nearest Vehicle to.
  • Live traffic information interface.

Recommendation

I would wish to urge the Quartix Vehicle tracking system because their pricing policy is sensible. Their tracking systems are dependable for users. There was existent clip qui vive system, and even look into the vehicle via Route Map show on their web site. Controls on the show let user to step through each of the trips of the twenty-four hours and the system will choose a map graduated table to demo the whole path. Speed and clip information can be demo any point in the path and show can be adjust to a detailed of street map demoing the exact place vehicle right now. Access the system from any Personal computer and no particular package required.

Daily or hebdomadal timesheets are available for user on at any clip. The user work force can be reduced and besides cut down waste clip look intoing the item of vehicles.

The Clear Reports supply a clear and easy-to-read 1. The item the study can be specified for each vehicle.

The Location Names and Job References adding client reference location names is an easy undertaking.

The Quick Links to Maps supply e-mail reporst are links to location and path maps – let user to look into rapidly and straight image of path.

TASK- 2

Communication method

There are two manner wirelesss communicating either simplex or semidetached house. With simplex communicating service user can direct and have on the same frequence. Duplex communicating service user can direct on one frequence but receive on a different frequence.

A duplex communicating service has two methods of service that a simplex service does n’t hold. The first one is full-duplex, user can used a duplex service to at the same time speak and listen at the same clip. E.g. Telephone or cell phone. The 2nd is half-duplex, a duplex service can be used with a repeater station. A repeater station is normally situated someplace with good coverage and it has an first-class forward pass system, sensitive receiving system and high power sender. It rebroadcasts signals that it receives, but on a different frequence. The repeater gives much longer scope coverage. It is two manner communicating service but user ca n’t utilize at the same time.

Half-duplex

Half-duplex system allows communications in both waies, but non at the same time merely one way at a clip. Any wireless say “ Over and Out ” to command the flow of transmittal, or any other process to guarantee that merely one party broadcasts at a clip would be a half-duplex system.

A good illustration for a half-duplex system would be a one lane route with traffic accountants at each terminal. Traffic can flux in both waies, but merely one way at a clip with this being regulated by the accountants. Another is walkie-talkie format.

Full Duplex

A full-duplex system is both waies communicating, this method allows at the same time. All wire telephone webs are full semidetached house as they allow both companies to talk and be heard at one time.
A good illustration for a full-duplex system would be a two lane route with one lane for each way. Example: Telephone, Mobile Phone, etc. These footings besides apply to early Personal computer sound cards, nevertheless about all are now full-duplex.

Allotment of Frequency

Legal demand for allotment of frequence in Myanmar is – 925 Megahertz

Because of current legal demands in Myanmar, telecommunication equipment with coverage country less than 300 metres or 1000 pess is define as cover type, RFID ( Radio Frequency Identification ) has great involvement non merely from industry but besides from users.

Due to ASEAN Telecommunication Regulators ‘ Council ( ATRC ) ordinances in September 2006

  • Allotment of spectrum for UHF RFID in ASEAN Regions is 860 – 960 MHz set
  • A minimal demand of spectrum for UHF RFID is 2 MHz for efficient usage
  • A minimal demand of effectual radiated power for UHF RFID is 0.5W

Licensed demands need to advert are

  • Sender Specifications ( Station Name, Class of Station, etc )
  • Sender Equipment ( Class of emanation, Transmitter end product tower, etc )
  • Antenna Characteristics ( Antenna Type, Maximum Gain ( dubnium ) , etc )
  • Receiver Equipment ( Name of Station, complete attention deficit disorder of Receiver Number, etc )

Costss

  • The walky-talkies are really cheap ( e.g. , household wireless service wirelesss can be every bit small as $ 20 at the local price reduction section shop ) .
  • Commercially rated bipartisan wirelesss will be in the several hundred-dollar scopes. Two-way portable wireless with entry-level encoding typically costs between $ 350 and $ 700.
  • Antennas and installing will differ by site and demands ; nevertheless, a quality base station VHF/UHF aerial costs about $ 800 to $ 1,000. A nomadic aerial normally costs about between $ 40 and $ 90 differed on its type and intended usage.

Recommendation

I would wish to look into half-duplex communicating method with Public Trunked Mobile Radio ( PTMR ) for A2B Taxi Company.

It is a radio-base web services and provided local communicating on a individual channel. PTMR was designed for voice communications but it can besides back up informations. It provides an cheap, practical system for fleet communications. So it is suited for vehicle tracking system.

Half duplex systems are non consequence against RF noise associated with the reader. The digital FM response from the ticket to the reader uses two LF channels to return the informations doing the tickets more able to be read in noisy electromagnetic intervention ( EMI ) environments typical of RFID applications. HDX is lower cost of aerials and equipment than FDX.

TASK – 3

Mesh or Grid Network

All user nodes are connected to one other. No commanding node and if one node fails there is ever on alternate messaging path.

Mesh networking is a manner to route informations, voice and instructions between nodes. It allows for uninterrupted connexions and reconfiguration about broken or blocked waies by “hopping” from node to node until the finish is reached. All nodes are connected to each other is a to the full connected web. The differed from other webs is that the all component parts can link to each other by multiple hops, and they by and large are non nomadic. Mesh webs can be known as one type of ad hoc web

Mesh web is self-healing. Network can still run even when a node breaks down or a connexion fails. So this web is really dependable. It can applicable to wireless and wired webs, and package interaction.

Bus

Each node is connected to common nexus like a cardinal anchor in coach topology. There is no commanding node and each node can entree to the web every bit.

Bus constellation can compare to a individual carriageway route, which can be shared by many vehicles via guaranting that a minimal spacing is maintained between them. The most common application of coach topology is normally a Local Area Network ( LAN ) functioning the communicating between demand of user ‘s site.

Bus web is the simplest manner a web to be organized. All computing machines are linked to the same transmittal line by utilizing a overseas telegram, normally coaxal in coach topology. “ Bus ” refers to the physical line that joins all nodes on the web.

Ring

A ring signifier is one where the nexus or carriers are looped in and out of each node. The benefit is that if any portion of the pealing gets broken, the web will be continued to run.

This type of constellation is most frequently used where high dependability is needed, for illustration in the cardinal nucleus of a web.

All computing machines take bends pass oning, making a cringle of computing machines in which they all have their bend to talk one after another in pealing topology web.

Ringing webs are non linked together in cringles. They are linked to a distributer ( called

MAU

( Multiple Access Units ) ) , which have ten sockets. Eight for LAN devices to do remotion and add-on of workstations and resources much easier, two for connect to MAU together. That manages communicating between the computing machines linked to it, by giving clip to “ talk ” to each of them. ( Multiple Access Units ) ) , which have ten sockets. Eight for LAN devices to do remotion and add-on of workstations and resources much easier, two for connect to MAU together. That manages communicating between the computing machines linked to it, by giving clip to “ talk ” to each of them.

Star

In star topology web, all user nodes are connected through a dedicated nexus to the cardinal waiter node. If one of node fail all other paths are still available to run. And if the waiter fails the whole web will neglect down.

Network in star topology, all nodes are linked to a piece of hardware called a

Hub

. This is a box which incorporating a certain figure of sockets, which cables coming out of the computing machines can be plugged. Its map is to guarantee communications between those sockets. . This is a box which incorporating a certain figure of sockets, which cables coming out of the computing machines can be plugged. Its map is to guarantee communications between those sockets.

Star topology webs are much less vulnerable, e.g. the connexions can easy be removed by unpluging it from the hub, without impacting the remainder of the web.

The other star topology webs are:

  • Interconnected star
  • Interconnected star plus ring ( combined interconnected star and pealing constellation )
  • Through connected nexus
  • The tandem rule ( The connexion of one or more sites relies on other site to accomplish their several interconnectedness. )
  • Hierarchical construction

In star web Twisted Pair. Maximum figure of 1,024 can be connected with a maximal overseas telegram length of 100 metres and a entire distance of 500 metres. Signal from a web hub can reiterate three times, giving a maximal figure of four informations cupboards. The distance between cupboards can be extended by exchanging to a star coach topology via utilizing fiber ocular overseas telegram for links between cupboards.

Star topology should be used to make the in-house web ( LAN ) for used by the accountants. Because star topology is easy to put in and wired, no breaks to the web when connecting or taking devices and it can still execute – forestalling unneeded nodes when informations packages are go throughing. All devices are inherently isolated by nexus that connects to the hub. It makes the isolation of the peculiar devices reasonably straightforward, and all unpluging devices from the hub. Isolated prevents any non-centralized failure from impacting the web besides. There besides increasing capacity of the cardinal hub or adding extra devices to the star can assist to scale the web easy. Centralization allows the review of traffic through web. It made to analyse all the traffic in the web and determine leery behaviour easy. Star topology is easy to set up, understand and besides easy to navigated. This topology prevent from complex routing or message passing protocols. However the information rate is comparatively low between the cardinal waiter and the nodes low specification twisted.-pair overseas telegram can be used to link between waiter and nodes there is no affect the remainder of web if there is a mistake on one node and besides single node failure.

TASK – 4
Security for transmittal of vehicle location informations and voice communicating transmittal

The wireless frequence signal can be intercepted during conversation. The biggest menace to the security of nomadic operations is spying or listen ining method known as “drive-by hacking” . So we need to utilize security system to forestall the hazard of security characteristic called Wired Equivalent Privacy ( WEP ) . This criterion provided a method for coding informations transmittal and authenticating.

In WEP all message are encrypted by via CRC-32 checksum to supply some grade of unity. And the privateness is maintained via the RC4 encoding. So without utilizing the secret key, the informations ca n’t be easy decrypted. WEP is really easy to implement. The demand is to put the encoding key on the APs and on each client. That provided a basic degree of security for WLAN applications. User can definable WEP key and it is unlimited so identify can be changed.

There are two hallmark methods in IEEE 802.11

  • Open hallmark
  • Shared-key hallmark

Open hallmark – Is more carefully described as device-oriented hallmark and can be specify a void hallmark all petitions are accepted. If there is no WEP in unfastened hallmark, it leaves the WLAN broad unfastened to any clients who know the SSID. But WEP can able the secret key to go the indirect appraiser.

The shared – cardinal hallmark procedure is a four measure procedure that begins when the AP receive the validated petition for association. After that, a series of direction frame are transmitted between the Stationss to bring forth the hallmark.

So WEP map should be usage for the new cab company to forestall from menaces. It is easy to implement. WEP provide security and privateness in transmittal between the AP and the clients. By utilizing WEP the undermentioned benefit can derive:

  • All message are encrypted by utilizing CRC-32 checksum to supply some grade of unity
  • The privateness is maintained via the RC4 encoding. Without possessing of the secret key, the message ca n’t be easy decrypted.
  • WEP is really easy to implement
  • WEP provided degree of security for WLAN applications.
  • WEP cardinal can be define by user and limitless, keys can be changed.

TASK – 5

Report

Task – 1

I would wish to urge the Quartix Vehicle tracking system because their pricing policy is sensible. Their tracking systems are dependable for users. There was existent clip qui vive system, and even look into the vehicle via Route Map show on their web site. Controls on the show let user to step through each of the trips of the twenty-four hours and the system will choose a map graduated table to demo the whole path. Speed and clip information can be demo any point in the path and show can be adjust to a detailed of street map demoing the exact place vehicle right now. Access the system from any Personal computer and no particular package required.

Daily or hebdomadal timesheets are available for user on at any clip. The user work force can be reduced and besides cut down waste clip look intoing the item of vehicles.

The Clear Reports supply a clear and easy-to-read 1. The item the study can be specified for each vehicle.

The Location Names and Job References adding client reference location names is an easy undertaking.

The Quick Links to Maps supply e-mail reporst are links to location and path maps – let user to look into rapidly and straight image of path.

Task – 2

I would wish to look into half-duplex communicating method with PTMR for new cab company.

I would wish to look into half-duplex communicating method with Public Trunked Mobile Radio ( PTMR ) for A2B Taxi Company.

It is a radio-base web services and provided local communicating on a individual channel. PTMR was designed for voice communications but it can besides back up informations. It provides an cheap, practical system for fleet communications. So it is suited for vehicle tracking system.

Half duplex systems are non consequence against RF noise associated with the reader. The digital FM response from the ticket to the reader uses two LF channels to return the informations doing the tickets more able to be read in noisy electromagnetic intervention ( EMI ) environments typical of RFID applications. HDX is lower cost of aerials and equipment than FDX.

Task – 3

Star topology should be used to make the in-house web ( LAN ) for used by the accountants. Because star topology is easy to put in and wired, no breaks to the web when connecting or taking devices and it can still execute – forestalling unneeded nodes when informations packages are go throughing. All devices are inherently isolated by nexus that connects to the hub. It makes the isolation of the peculiar devices reasonably straightforward, and all unpluging devices from the hub. Isolated prevents any non-centralized failure from impacting the web besides. There besides increasing capacity of the cardinal hub or adding extra devices to the star can assist to scale the web easy. Centralization allows the review of traffic through web. It made to analyse all the traffic in the web and determine leery behaviour easy. Star topology is easy to set up, understand and besides easy to navigated. This topology prevent from complex routing or message passing protocols. However the information rate is comparatively low between the cardinal waiter and the nodes low specification twisted.-pair overseas telegram can be used to link between waiter and nodes there is no affect the remainder of web if there is a mistake on one node and besides single node failure.

Task – 4

Radio frequence signals can be intercepted by outside the locality and besides any unauthorised nomadic device can have the familial message. So the security is really of import in wireless communicating. To solute the security jobs we must utilize security method. IEEE 802.11b have security characteristic which is Wire Equivalent Privacy ( WEP ) . This method provides coding transmittals and hallmark each client.

WEP map should be usage for the new cab company to forestall from menaces. It is easy to implement. WEP provide security and privateness in transmittal between the AP and the clients. By utilizing WEP the undermentioned benefit can derive: –

  • All message s are encrypted by utilizing CRC-32 checksum to supply some grade of unity
  • The privateness is maintained via the RC4 encoding. Without possessing of the secret key, the message ca n’t be easy decrypted.
  • WEP is highly easy to implement. All that is required is to put the encoding key on the APs and on each client.
  • WEP provided a basic degree of security for WLAN applications.
  • WEP key are user-definable and limitless. WEP keys can be changed.

Mentions

Books

Title: Enterprise Networking

Writer Name: NCC Education UK

ISBN: 0954307103

Year: 2008

Web sites

URL Access Data & A ; Time

www.v-sol.co.uk

www.quartix.com

www.remoteassetmanagement.co.uk

www.mpt.net.mm

www.tcpipguide.com

www.tcpipguide.com

www.techspot.com 1

hypertext transfer protocol: //telecom.hellodirect.com/docs/Tutorials/DuplexExplained.1.080801.asp

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