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PC Maintenance: Preparing for A+ Certification Chapter 7: Cables.

Published byCameron Hancock Modified over 8 years ago

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Presentation on theme: "PC Maintenance: Preparing for A+ Certification Chapter 7: Cables."— Presentation transcript:

1 PC Maintenance: Preparing for A+ Certification Chapter 7: Cables

2 Chapter 7 Objectives Differentiate between serial and parallel data transmission Differentiate between serial and parallel data transmission Know how to read a cable pin-out diagram Know how to read a cable pin-out diagram Identify common connector types and their purposes Identify common connector types and their purposes Identify types of cables used for networking Identify types of cables used for networking Troubleshoot cable problems Troubleshoot cable problems

3 Serial Data Transmission Only one wire carries data in each direction Only one wire carries data in each direction Data travels one bit at a time Data travels one bit at a time

4 Serial Data Transmission Examples: Examples: Legacy COM port (“serial port”) Legacy COM port (“serial port”) Universal Serial Bus (USB) Universal Serial Bus (USB) FireWire (IEEE 1394) FireWire (IEEE 1394) Serial IDE Serial IDE

5 Parallel Data Transmission Multiple (usually eight) wires carry data in each direction Multiple (usually eight) wires carry data in each direction Data travels one complete byte at a time Data travels one complete byte at a time

6 Parallel Data Transmission Examples: Examples: Legacy LPT port (“parallel port,” “printer port”) Legacy LPT port (“parallel port,” “printer port”) IDE ribbon cable IDE ribbon cable

7 Cable Construction Connectors on each end Connectors on each end Conduit (wire, glass) Conduit (wire, glass) Protective casing around conduit Protective casing around conduit Dirt and other contaminants Dirt and other contaminants Electromagnetic interference Electromagnetic interference

8 Cable Construction

9 Pin-Out Diagrams Numbers each pin of each connector Numbers each pin of each connector States the purpose of each pin in data transmission States the purpose of each pin in data transmission

10 Pin-Out Diagram Example

11

12 Connector Types BNC BNC D-Sub (DB) D-Sub (DB) Centronics Centronics Ribbon Ribbon RJ RJ DIN DIN Mini-DIN Mini-DIN Audio USB FireWire/IEE-1394 Power Mini Molex

13 Legacy Serial Also called COM Port Also called COM Port Nearly synonymous with “serial” Nearly synonymous with “serial” Male DB-9 or DB-25 on PC Male DB-9 or DB-25 on PC Max. speed depends on UART chip

14 USB Universal Serial Bus Universal Serial Bus Standards: Standards: USB 1.1, 12Mbps USB 1.1, 12Mbps USB 2.0, 400Mbps USB 2.0, 400Mbps Fully Plug and Play Fully Plug and Play Fully hot-pluggable Fully hot-pluggable Many devices can share a single set of resources (IRQ, address) Many devices can share a single set of resources (IRQ, address)

15 FireWire IEEE 1394 is the specification IEEE 1394 is the specification A competitor to USB A competitor to USB Not as widely adopted on motherboards Not as widely adopted on motherboards Preferred interface for digital video cameras Preferred interface for digital video cameras Max. speed of 100 to 200Mbps Max. speed of 100 to 200Mbps

16 IDE Ribbon Cables Support up to two drives per cable Support up to two drives per cable Most motherboards support up to two cables Most motherboards support up to two cables 40-wire, normal 40-wire, normal 80-wire, enhanced version 80-wire, enhanced version Uses only 40 wires for data Uses only 40 wires for data Extra wires are buffers to reduce EMI Extra wires are buffers to reduce EMI

17 Other Common Ribbon Cables Legacy parallel and serial port connections to an AT-style motherboard Legacy parallel and serial port connections to an AT-style motherboard

18 Parallel Printer Cables 25-pin at PC end 25-pin at PC end Female on PC Female on PC Male on cable Male on cable Opposite of 25-pin legacy serial Opposite of 25-pin legacy serial 36-pin Centronics at printer end 36-pin Centronics at printer end

19 Legacy Parallel Port Modes IEEE 1284 is the standard IEEE 1284 is the standard SPP: Standard Parallel Port SPP: Standard Parallel Port 8-bit output at 150KB/sec 8-bit output at 150KB/sec 4-bit input at 50KB/sec 4-bit input at 50KB/sec Bidirectional Bidirectional Improved version of SPP Improved version of SPP 8-bit input and output 8-bit input and output 150KB/sec in both directions 150KB/sec in both directions

20 Legacy Parallel Port Modes Enhanced Parallel Port (EPP) Enhanced Parallel Port (EPP) Bidirectional 8-bit data transfer at 2MB/sec Bidirectional 8-bit data transfer at 2MB/sec Designed for non-printer devices such as drives Designed for non-printer devices such as drives Enhanced Capabilities Port (ECP) Enhanced Capabilities Port (ECP) Same as EPP in speed and width Same as EPP in speed and width Designed specifically for printers and scanners Designed specifically for printers and scanners Uses a DMA channel Uses a DMA channel

21 Network Cables Coaxial Coaxial Twisted Pair Twisted Pair Fiber Optic Fiber Optic

22 Coaxial Cable Thick Ethernet Thick Ethernet 0.5” in diameter 0.5” in diameter 10Base5 networking 10Base5 networking Thin Ethernet Thin Ethernet 0.2” in diameter 0.2” in diameter 10Base2 networking 10Base2 networking

23 Unshielded Twisted Pair Categories: Categories: Cat1 – traditional telephone cable. Two pairs Cat1 – traditional telephone cable. Two pairs Cat2: Four pairs Cat2: Four pairs Cat3 – 10BaseT Ethernet, four pairs Cat3 – 10BaseT Ethernet, four pairs Cat5 – 100BaseT Ethernet, four pairs Cat5 – 100BaseT Ethernet, four pairs Cat5e – Gigabit Ethernet, four pairs Cat5e – Gigabit Ethernet, four pairs

24 Connectors on UTP Cable RJ-45, used for networking RJ-14, dual-line phone systems RJ-11, single-line phone systems

25 Shielded Twisted Pair EMI Shielding EMI Shielding Described with types, not categories Described with types, not categories Type 1: Two pairs. Most common type Type 1: Two pairs. Most common type Type 2, Type 3: Four pairs Type 2, Type 3: Four pairs Type 6: Patch cable for token ring hubs Type 6: Patch cable for token ring hubs Type 8: Flat for running under carpets Type 8: Flat for running under carpets Type 9: Two pair, high-grade Type 9: Two pair, high-grade

26 Fiber Optic Cable Uses light, not electricity Uses light, not electricity Expensive Expensive Can be difficult to work with Can be difficult to work with High performance High performance Long range (up to 6500 feet) Long range (up to 6500 feet) Used with some FDDI and ATM networks Used with some FDDI and ATM networks

27 Fiber Optic Cable

28 Troubleshooting Cables Check port status in BIOS Setup Check port status in BIOS Setup Check port status in Windows Check port status in Windows Test port with loop-back plug Test port with loop-back plug Check cable for broken wires with multimeter Check cable for broken wires with multimeter

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