ITM 301 Chapter 4: Chapter 4

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ITM301 Chapter 4
Network Equipment in Commercial Buildings
TIA/EIA’s joint 568 Commercial Building Wiring Standard
Also known as structured cabling
Describes the best way to install networking media to maximize
performance and minimize upkeep
Apply no matter what type of media, transmission technology, or
networking speeds are involved
Based on hierarchical design and assumes a network based on the start
topology
Components
Entrance facilities
MDF (Main Distribution Frame)
IDF (Intermediate Distribution Frame)
Horizontal Wiring
Backbone Wiring
Work Area
Cable Management
Cable installation tips to prevent Physical layer failures:
When terminating twisted-pair cabling, don’t leave more than 1 inch of
exposed cable before a termination
Do not exceed the cable’s prescribed bend radius (radius of the
maximum arc into which you can loop a cable without impairing data
transmission)
Use a cable tester to verify that each cable segment transmits data
reliably
Clinch cables loosely
Avoid laying cables across a floor and use corf covers they must be
exposed
Avoid EMI
Make sure cable sheath is plenum-rated
Pay attention to grounding requirements
Leave some slack in cable runs
Use cable management devices such as cable trays, braided sleeving
and furniture grommets
Use patch panels to organize and connect lines
You or your network manager should specify standards for the types of
cable used by your organization
Keep your cable plant documentation accessible
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Label every data jack or port, patch panel and connector
Use colour-coded cables for different purposes
Update your documentation as you make changes to the network
Device Management
Maintaining up-to-date records about your network devices will reduce your
workload
Will also make troubleshooting easier and more efficient
In order to keep track of devices
Name them systematically and label them
Labeling and Naming Conventions
Tips of labeling:
Use colour-coded cables for different purposes and use cable tags to
identify each cable’s purpose
Label the ports and jacks that cables connect to
Use a portable label maker and use labels that are durable and are
designed to stick to plastic and metal
Where labels won’t fit on the device, draw a simple diagram of each
device that indicates how each port is used
Use names that are as descriptive as possible
Use established naming conventions
Rack Systems
Rack Systems provide mounting hardware for network equipment to optimize
the use of square footage in equipment rooms
And ensure adequate spacing, access and ventilation for these devices
Come in a standard 19-inch frame, but may also come across a 23-inch
rack that includes the entire width of the rack
Racks may be wall or ceiling-mounted, or freestanding on the floor
Racks are measured in rack units (RU or U)
In a typical rack system, airflow though the chassis is typically designed to move
from front to back
Rack-monitoring systems should be installed to sound an alarm if the
overall temperature rises too much
NAS (Network Attached Storage)
Fault tolerance techniques that allow data storage or other operations to
continue in the event of a failure or fault of one its components
NAS a specialized storage device or group of storage devices that provides
centralized fault tolerant data storage for a network
Contains its own file system optimized for saving and serving files
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Reads and writes from its disk significantly faster than other types of
servers
Can be easily expanded without interrupting service
A NAS device cannot communicate directly with clients
Clients got through a file server, which communicates with that NAS
device
SAN (Storage Area Networks)
A SAN is a network of storage devices that communicate directly with each other
and with other networks
Uses a type of architecture that is similar to mesh topology, which is very
fault-tolerant
SANS use one of the two types of Transport layer protocols:
Fibre Channel (FC)
iSCSI
A SAN can be installed in a location separate from the LAN it serves
SANs are highly scalable and have:
A very high fault-tolerance
Massive storage capabilities
Fast data access
SANs are best suited to environments with huge quantities of data that must
always be quickly available
Managing Power Sources and the Environment
Part of managing a network is managing power sources to account for outages
and fluctuations
You also need to monitor and manage the environment that might affect sensitive
network equipment
Power Management
Power surges can cause serious damage to sensitive computer equipment
Can be a frustrating sources of network problems
Arm yourself with an understanding of:
The nature of an electric circuit
Electrical components that manage electricity
Power Flaws
Power flaws that can damage your equipment:
Surge momentary increase in voltage due to lighting strikes, solar flares,
or electrical problems
Noise fluctuation in voltage levels caused by other devices on the
network or EMI
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