Chapter 13 - Designing Networks

A) Steps in Designing Networks (Fig. 13.5)

1. Segment the Enterprise (by geography, department, building, floor)
2. Create a Model LAN for each segment
3. Evaluate the LANs to Determine if they are approriate for each segment
4. Interconnect Network Segments (Repeaters, Bridges, Routers, Gateways)

B) Networking Elements

• Transmission media: Twisted Pair, Coaxial cable, fiber optic cable, microwave, satellite
• Transmission signals: analog vs. digital
• Transmission modes: simplex, half duplex, full duplex
• Network Topologies (star, bus, ring, mesh, tree)
• Network Interface Cards
• Network Servers
• Network Operating Systems (Novell, WFWG, Banyan Vines)
• Modems
• Multiplexers (MUX) - Frequency-divison-multiplexer (FDM), TDM, STDM
• Front-end Processors (FEP)
• Protocols - OSI, TCP/IP, SNA
• X.400 - e-mail standard
• X.500 - electronic phone book
• X.12 - EDI

C) Types of Transmission Cables

• Twisted Pair (STP & UTP)
• Coaxial (10Base2 & 10Base5)
• choose best cable for the job
• avoid impedance mismatches
• Fiber

D) Designing LANs

Token Ring (4-16 Mbps with STP or 100 Mbps with FDDI)

requires MAU (multistation access units) (Fig. 13.12)

Ethernet (CSMA/CD) - (Fig. 13.13)

Premises Distribution System(PDS) - structured cable design method (Fig. 13.14)

• Vertical Backbone Subsystem
• Horizontal Backbone Wiring Subsystem
• Work Location Wiring Subsystem
• Adminstrative Subsystem
• Campus Subsystem

Connecting LANs - (Repeaters, Bridges, Routers, Gateways)

Wireless LANs

E) Services for Designing Wide Area Networks

• T-Span Services
• T1 - 1.544 Mbps using TDM, 4 wire & digital transmission
• Fractional T1 (Fig. 13.17)
• X.25 Packet-Switching Network
• Frame-Relay & Cell Relay
• ISDN (Integrated Services Digital Network)
• ATM & SONET

F) Using Airwave Transmission Media to Design WANs

• Microwaves
• Satellites - VSAT (Very Small Aperature Terminal)

Exercises: look over 1-18; turn in 13.19, 13.21, 13.23, 13.28