1 / 24

Module 4

Module 4. PHYSICAL MEDIA. 7. 6. 5. 4. 3. 2. 1. Physical Media Types Covered. Coaxial Cable Twisted Pair Fiber Optic Cable WAN Cables. Coaxial Cables. 10Base2 (ThinLAN) - 10 Mbps baseband, 2 for 200 (actually 185 meters)

tender
Download Presentation

Module 4

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Module 4 PHYSICAL MEDIA

  2. 7 6 5 4 3 2 1 Physical Media Types Covered • Coaxial Cable • Twisted Pair • Fiber Optic Cable • WAN Cables

  3. Coaxial Cables • 10Base2 (ThinLAN) - 10 Mbps baseband, 2 for 200 (actually 185 meters) • 10Base5 (ThickLAN) - Maximum data transfer speed of 10 Mbps, uses baseband transmission; 500 meters maximum cable length Baseband transmission is a type of digital data transmission in which each medium (wire) carries only one signal, or channel, at a time. In contrast, Broadband transmission enables a single wire to carry multiple signals simultaneously.

  4. Coax - 10Base2 (ThinLAN) • Cable Type - RG-58A/U • Impedance - 50W • Terminated with 50W terminators • Connection method - BNC (as opposed to the F connector used for cable TV) • Grounding - As determined by local electrical code

  5. Coax - 10Base2 Rules • Minimum distance between two nodes: 0.5m (1.64 ft) • Maximum number of nodes / segment: 30 • Maximum segment length: 185m (606.7 ft)

  6. Coax - 10Base5 (Thick LAN) • Impedance - 50W • Terminated with 50W terminators • Connections - ‘N’ type connections to terminate. ‘Vampire’ tap for node connections. • Grounding - Grounded at one point only.

  7. Coax - 10Base5 Rules • Minimum Distance between two nodes: 2.5m • Maximum number of nodes / segment: 100 • Maximum segment length: 500m

  8. WARNING Breaking any of these rules will cause excessive error conditions!

  9. Twisted Pair Cable • Cable Type: Low grade telephone cable through to cat.5. (data cables normally cat.3 to cat.5) • Shielding: Shielded (STP) Unshielded (UTP) • Connectors: RJ45, Telco, IBM Type 1 connector (genderless), 9 pin. • Use: 10BaseT, 100BaseTX, 100VG ANYLAN, Token Ring

  10. Twisted Pair Rules • Cable must be twisted • Maximum distance depends on quality of cable, shielding and speed of transmission • Maximum cable length for Cat3, Cat4 and Cat5 is 100m

  11. Fiber Optic • Cable type determined by - diameter of core, diameter of cladding (e.g.. 62.5 /125) • Light source - Single mode- Laser, Multimode - LED • Connectors - SC, ST, MIC • Use - FOIRL, 10BaseFL, FDDI, 100BaseF, Fiber Channel, SONET/SDH (for WAN) Gigabit Ethernet (future)

  12. FOIRL: Fiber Optic Inter-Repeater Link is a vendor independent standard means for connecting only 2 repeater units based on the IEEE 802.3 fiber optic specification. It is being replaced by 10BaseFL. 10BaseFL segments can be up to 2000 meters. FDDI: Fiber Distributed Data Interface handles data rates of up to 100Mbps; typical application: used as backbone for campus and wide-area networks. FDDI networks are token-passing networks, using dual-ring topology over fiber-optic transmission media. Fiber Channel is a technology for serially transmitting data between computer devices at a data rate of up to 1 Gbps. SONET/SDH: Synchronous Optical Network is an optical fiber-based network standard; handles 51.8Mbps to 2.48Gbps. SDH is its international equivalent.

  13. Fiber Optic Rules • Maximum distance determined by type of cable and light source used. • Need to ensure cable connection is from TX on one device to RX on the other

  14. Fiber Optic Safety Considerations • Never look at the output of a fiber optic transmitter • Do not handle unterminated fiber • Do not attach connectors to fiber as special skills and tools are required.

  15. WAN Cables • Cable Type: Various • Shielding: Shielded & Unshielded cable • Connectors: RS232 (‘D’ type 25, 15, 9 pin), X.21, V.35 • Common pairs use: TX/RX, CTS/RTS, Control/Indicate • Uses: RS232, X.21, V.35

  16. WAN Cable Rules Cable Distance + Cable quality = Maximum Speed

  17. Cable Connectivity

  18. Simple RS232 25 pin straight through DTE/DCE DTE DCE TX RX PIN 2 PIN 2 RX TX PIN 3 PIN 3 TO PSTN/NETWORK PC

  19. Logical pinout groupings Pinouts used to transfer the data (such as TX/RX) DATA Pinouts used to control the flow of data such as RTS/CTS (used in DTE/DCE handshaking) CONTROL

  20. Use of straight through and cross over cabling DTE DCE TX RX PIN 2 PIN 2 RX TX PIN 3 PIN 3 R TS C TS PIN 4 PIN 4 RTS CTS PIN 5 PIN 5 MODEM PC DTE DTE TX TX PIN 2 PIN 2 RX RX PIN 3 PIN 3 R TS R TS PIN 4 PIN 4 CTS CTS PIN 5 PIN 5 NOTE: More pinouts may be required

  21. Twisted pair cable connectivity in a LAN environment MDI MDI-X LAN card HUB PC MDI=Media Dependent Interface X in MDI-X=Crossed MDI (for LAN) is equivalent to DTE (for WAN) & MDI-X (for LAN) is equivalent to DCE (for WAN).

  22. MDI to MDI-X connection MDI MDI-X Twisted pair cabling 1 1 2 2 3 3 6 6 HUB PC

  23. Use of straight through and cross over cabling MDI MDI-X MDI-X CROSS STRAIGHT O VER THROUGH CABLE CABLE PC HUB HUB CROSS O VER CABLE MDI-X MDI MDI STRAIGHT THROUGH CABLE SWITCH R OUTER PC Hubs and Switches are MDI-X devices Hosts and Routers are MDI devices

  24. Summary • Media Types - Coaxial Cable - Twisted Pair - Fiber - WAN Cables • Safety Considerations for Fiber • Connectivity Conventions - WAN Cables = DTE/DCE - Twisted Pair LAN = MDI/MDI-X

More Related