Telecommunications Systems
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Telecommunications Systems
Due: Week #2
Yolanda M. Maholmes
University of Phoenix
NTC 410
Network & Telecommunications Concepts II
November 29, 2005
Instructor: Richard T. Seay, M.B.A., BSCIS
Discussion Questions:
Which transmission media are the most secure?
Optical Fibers are the most secure
Immunity to electromagnetic interference and crosstalk.
No electrical ground look or short circuit problems
Small size and light weight
Large bandwidth for size and weight
Safe In combustible areas
Immunity to lightning and electrical discharges.
Longer cable runs between repeaters.
viii.
Flexibility and high strength
Potential high temperature operation
Resistant to nuclear radiation
Secure against signal leakage and interference
No electrical hazard when cut or damaged.
Which transmission media are the least secure?
Coaxial Cable is the least secure.
Used by cable tv and some telephone companys, which are fairly easy to tap into.
Data can be intercepted
LOGICAL/PHYSICAL SYSTEM DESIGN
The logical network design addresses the business needs for the network. It addresses future issues that may arise, such as growth potential, future business requirements, security, capacity and efficiency. In the logical network design, several questions must be asked. What are the business goals? These goals include the capability to run network applications to meet corporate business constraints, such as budgets, limited networking personnel, and tight timeframes. (Priscilla Opeenheimer, 2004,pg. 1.)
The logical network design looks at how monitoring systems, will monitor clients, servers, printers within an IC network; address space; and the forwarding of these messages and alerts to the central monitoring system.
The physical modeling involves the actual design of a database according to the requirements that were established during logical modeling. Physical modeling deals with the conversion of the logical or business model, into a relational database model. When physical modeling occurs, objects are being defined at the schema level. During physical modeling, objects such as a table and columns are created based on entities and attributes that were defined during logical modeling. The implementation of the physical model is dependent on the hardware and software being used by the company.
The physical design phase communicates “decisions about the hardware used to deliver a system.” A physical design is created from a logical network design. It often expands elements found in a logical design. An example would be a WAN connection on a logical design diagram with a line between two buildings. When transformed into a physical design, that single line could expand into the connection, routers and other equipment at each end of the connection.
The physical design also includes most of the work required to fit the logical design into the target hardware /software environment (Johnson, S., 2005 pg. 3.) Although program specifications are not produced until later in the project, processing sequences are determined as are all aspects of codes input-output media, data based design and implementation plans. One must design the detail physical system. Specify input