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Types of Connectors
DB-9, DB-25: used for serial and parallel port communications, respectively
RJ-11, RJ-12: standard telephone connectors RJ-45: network connector PS/2 (mini-DIN): supports mouse, scanners,
and some keyboards Centronics: supports printers USB: supports a variety of peripheral
devices
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IEEE 1394 (FireWire)
High-speed interface that allows up to 62 devices on a chain
Advantages: hot swap, inexpensive connectors, simple cable design
6 pin or 4 pin cable 400 Mbps data transfer May be referred to as:
IEEE 1394, FireWire, i.LINK
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Universal Serial Bus (USB) Connects peripherals outside the
computer Supports speeds of 12 Mbps (USB 1.1) Support speeds of 480 Mbps (USB 2.0) Offers the following advantages:
Hot swap Ease of adding new devices
Cable is A or B endedA B
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Troubleshooting Cables
Always check the cable first. Always check for loose connections. Check for bent or broken pins. Do not use force to insert cables Check for worn or frayed cables. Ensure that you are using the correct
cable.
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Monitor Maintenance
Properly ventilate the enclosure. Clean the face of the CRT gently. Use energy-saving features. Check the cables, including the power
and display cables. Check the front panel controls. Try another display adapter.
Basic Requirements of a Network
A network links computers for communicating and sharing information and resources.
A network must provide Connections Communications Services
Local Area Networks
Cover a limited distance Allow sharing of data, peripherals,
software, and storage
Wide Area Networks
Span relatively large areas Typically consist of two or more LANs Are connected using telephone or
leased lines
Network Operating System
Network operating systems (NOSs) provide the ability to share file, print, and other services.
Computers can be servers, clients, or both.
Network Interface Cards (NICs) Provide the physical connection
between the computer’s expansion bus and the network cable
Boost the digital signal from the computer
IP Addressing
TCP/IP Address – Uniquely identifies your computer on the network
Allows communication on the LAN and to the internet
Your IP Address must be unique – address conflicts cause loss of connectivity
IPCONFIG 169.254.x.x or 0.0.0.0
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