PC Maintenance Preparing for A Certification Chapter 7

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

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

Chapter 7 Objectives Differentiate between serial and parallel data transmission n Know how to

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

Serial Data Transmission Only one wire carries data in each direction n Data travels

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

Serial Data Transmission n Examples: Legacy COM port (“serial port”) n Universal Serial Bus

Serial Data Transmission n Examples: Legacy COM port (“serial port”) n Universal Serial Bus (USB) n Fire. Wire (IEEE 1394) n Serial IDE n

Parallel Data Transmission Multiple (usually eight) wires carry data in each direction n Data

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

Parallel Data Transmission n Examples: Legacy LPT port (“parallel port, ” “printer port”) n

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

Cable Construction Connectors on each end n Conduit (wire, glass) n Protective casing around

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

Cable Construction

Cable Construction

Pin-Out Diagrams Numbers each pin of each connector n States the purpose of each

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

Pin-Out Diagram Example

Pin-Out Diagram Example

Pin-Out Diagram Example

Pin-Out Diagram Example

Connector Types n n n n BNC D-Sub (DB) Centronics Ribbon RJ DIN Mini-DIN

Connector Types n n n n BNC D-Sub (DB) Centronics Ribbon RJ DIN Mini-DIN n n Audio USB Fire. Wire/IEE-1394 Power n n Mini Molex

Legacy Serial n n Also called COM Port Nearly synonymous with “serial” Male DB-9

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

USB Universal Serial Bus n Standards: n USB 1. 1, 12 Mbps n USB

USB Universal Serial Bus n Standards: n USB 1. 1, 12 Mbps n USB 2. 0, 400 Mbps n Fully Plug and Play n Fully hot-pluggable n Many devices can share a single set of resources (IRQ, address) n

Fire. Wire IEEE 1394 is the specification n A competitor to USB n Not

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

IDE Ribbon Cables Support up to two drives per cable n Most motherboards support

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

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

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

Parallel Printer Cables n 25 -pin at PC end Female on PC n Male

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

Legacy Parallel Port Modes IEEE 1284 is the standard n SPP: Standard Parallel Port

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

Legacy Parallel Port Modes n Enhanced Parallel Port (EPP) Bidirectional 8 -bit data transfer

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

Network Cables Coaxial n Twisted Pair n Fiber Optic n

Network Cables Coaxial n Twisted Pair n Fiber Optic n

Coaxial Cable n Thick Ethernet 0. 5” in diameter n 10 Base 5 networking

Coaxial Cable n Thick Ethernet 0. 5” in diameter n 10 Base 5 networking n n Thin Ethernet 0. 2” in diameter n 10 Base 2 networking n

Unshielded Twisted Pair n Categories: Cat 1 – traditional telephone cable. Two pairs n

Unshielded Twisted Pair n Categories: Cat 1 – traditional telephone cable. Two pairs n Cat 2: Four pairs n Cat 3 – 10 Base. T Ethernet, four pairs n Cat 5 – 100 Base. T Ethernet, four pairs n Cat 5 e – Gigabit Ethernet, four pairs n

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

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

Shielded Twisted Pair EMI Shielding n Described with types, not categories n Type 1:

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

Fiber Optic Cable Uses light, not electricity n Expensive n Can be difficult to

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

Fiber Optic Cable

Fiber Optic Cable

Troubleshooting Cables Check port status in BIOS Setup n Check port status in Windows

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