PABX refers to private automatic branch exchange. It makes connections among internal telephones within an organization by using a circuit switch. Also, it allows the organization to connect public telephone network and internet via truck lines and modem. Each telephone set is assigned its own extension number for making internal and external calls. PABX reduces largely the cost for internal calls because only a few telephone lines are required for making external calls and internet access. By using switching network, users of PABX can be very flexible to establish internal and external calls, maintain and disconnect connections as per their own requirements. They can transfer external call to another extension, make internal call whilst connecting to external call and collect calls information for accounting purpose such as metering calls. Other modern advanced calling features like auto attendant, auto dialing, call barring, call parking, call forward, call waiting, call hold, conference call, hunt groups, pick-up groups, call diversion, voice mail and welcome message can also
be available under PABX telephone system.
http://www.multi-tech.com.hk/sie_hipath.htm
http://www.multi-tech.com.hk/pan_mainsystem.htm
Option 3: direct line (telephone function provided by telephone service provider)
Direct line refers to the connection of telephones within an organization to a public telephone service network. Each telephone requires the connection to a external telephone line for making internal and external calls whilst connection
http://www.pccw.com/Business/Voice+Services/Local+Telephone+Services/Business+Lines/Business+Telephone+Line?language=en_US
http://www.hgc.com.hk/eng/bus_tel_ddi.html
http://www.newworldtel.com/en/corporate-and-business-services/voice-services/fixed-line.html
c) Recommendations
PABX
Direct Line
VoIP
One-time setup cost
Cabling:
…
Equipment
…
Cabling:
…
Equipment
…
Cabling:
…
Equipment
…
d) Cost of operating the system
PABX
Direct Line
VoIP
Operation cost per year
External line leasing cost
…
Hardware maintenance
…
Operator
…
External line leasing cost
…
Hardware maintenance
…
Operator
…
External line leasing cost
…
Hardware maintenance
…
Operator
…
e) Recommendation
Assumption: Working in 10 years
PABX
Direct Line
VoIP
Total cost in 10 years
One time cost
Operating cost x 10 years
TOTAL COST
One time cost
Operating cost x 10 years
TOTAL COST
One time cost
Operating cost x 10 years
TOTAL COST
Features
Scalability
Share with Data network
Ease of implement
…
TOTAL SCORE
Give a score to each criterion (from 1 to 10 or 1 to 3) and calculate the total score and make the recommendation
Task 2
According to the question, "A staff computer network is required for email, standard office software, Internet access and for gallery database that record full details of all exhibits.". Hence, the internet services required includes: http, ftp, smtp, real-time broadcasting.
Streaming - for video
File sharing (ftp) - for uploading and downloading design, video, graphic files
Web sharing (http) - for demonstrate web site prototype
Secure web sharing (https) - SSL services for secure web content transmission
Mail service (SMTP and POP3) - for mail transfer between clients and company
Proxy server - for security and internet transfer caching
…
You can imagine that the gallery needs to upload and download a large amount of voice, pictures and multi-media files, and hence it is recommended the bandwidth should be…
In a recent estimation, assuming that there are totally 1000 email received and send per day and the average size for each email is 500K byte. Also,…
Email Traffic : 1000 email per day x 500K size per email
HTTP traffic:: 2000 page x 2M size per page
Video streaming: 80M per day
Total traffic size = xxx per day = yyy Mbps
c)
PCCW (www.pccw.com.hk)
Communilink.net (http://www.communilink.net/)
HGC (www.hgc.com.hk)
…
Compare the features and price provided by different service providers.
PCCW
HGC
Communilink
Features
Price
setup cost
operation cost
Support hours
Make your recommendation based on your services requirement.
…. Can provide the required services while having the lowest setup and operation cost. Hence I recommend …
Task 3
Information workstation.
Setup an application which demonstrates the information by accessing to the database shared in the intranet of the Gallery. The visitor can … Staff can update the data via the database of intranet… however, if there is any problem in the workstation, it only affects particular workstation instead of the whole system. The application limits the access right of visitor, simplified the support by simple reboot of the workstation.
Intranet website
Alternatively, an information system is designed for each gallery exhibit and the information is updated to each individual workstation….
Setup a website in the intranet of the Gallery, web server will access the database directly and provide the HTML as dynamic web page to display the information to the visitor. Security of the web of the web server will be concerned… Deny of service attack. Open the network access to public.
You can write an Apps which is downloadable via App Store, and access the database via intranet wifi network.
b)
Standalone
Client-server
Mobile
Advantages
Real-time synchronization of data
Can synchronize data in real-time with WiFi
Disadvantages
Cannot synchronize data in real-time
Need to update the Apps via Wifi network
(2 to 3 advantages for each option)
c)
Standalone
Client-server
Mobile
Setup Cost
Licensing cost
Equipment Cost
Licensing cost
Equipment Cost
Licensing cost
Equipment Cost
Operating Cost
Network cost
Maintenance cost
Network cost
Maintenance cost
Network cost
Maintenance cost
(2 to 3 advantages for each option.
d) Rewrite of content using another languages as information.
Another option can be translate the content using dynamic translation tools, such as SysTrans, or Google Apps.
Similar to previous discussion and provide scoring on your recommendation.
Task 4
Network Topologies - Star (explanation on what is a star tolopology)
Star - equipment: Router, Switches, Firewall
Media - copper wire
Bus Topologies
Equipment: Wireless Router, Access Points
Media: radio wave
Ring Topology
FDDI network
Media: optical fibre
Recommendations
Star
Bus
Ring
Media
Copper
Radio
Optical Fibre
Speed
10/100/1000 Mbps full utilized by a single staff
< 54Mbps divided by 15 staff
>1000Mbps
Cost of implementation
Cabling charge around $3000 ($200 per socket)
No cabling charge
WiFi card/interfaces ($150 per PC)
Cabling charge
Around $6000
Optical interface
($1200 per PC)
Security
High (dedicate channel)
Low (shared channel)
High (dedicate channel)
Sharing Bandwidth
No
Yes
No
…
…
…
…
Recommendation:
single site of 15 staff, …. Although WiFi seems cheaper in implementation, however, after considering the security and speed of communication, it is better to implement …Optical Fibre seems unnecessary and the cost of implementation is too high.
Conclusion
Summary on what is recommended in your report.
