designing premises cabling systems · structured cabling systems network specific cabling system a...
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Structured Cabling Systems
Network Specific Cabling SystemA specified cabling system designed to beinstalled according to a manufacturer's ornetwork’s standard set of rules. i.e.. IBMCabling Systems and IEEE 802.3, 10 Base 2
Open Cabling SystemA generic telecommunications cabling systemfor commercial buildings that will support amultiproduct, multivendor environment
Cabling Systems DesignDecision Tree
Applications
Software
Hardware
Network Platform
Mid-levelManagement
(Performance)Physical Plant
ExecutiveManagement
(Cost)
Influence Identify
DNADistributed Network Architecture
Equipment Room/Entrance Facility
TelecommunicationsCloset
TelecommunicationsCloset
Work Area
Work Area
Work Area
DNADistributed Network Architecture
Telecommunications Closet
Equipment Room
Server
Telecommunications Closet
Max 90 mM
ax 5
00 m
(fib
er)
DNAAdvantages/Disadvantages
• Advantages− Ideal for large buildings and multi-building campuses− Based upon TIA/EIA & ISO Standard Architecture− Low fiber count backbones
• Disadvantages− Electronics are distributed − MAC’s are more complicated− Administration time and costs are high− Port utilization and efficiency typically poor
CNACentralized Network Architecture
Single User or
ZoneSplice or
Interconnect
Pull-Through Cables
Centralized Cross-Connect/Electronics
CNACentralized Network Architecture
Equipment Room
Server
TelecommunicationsCloset ?
Interconnect or splice
Max 300 m total (fiber)
CNAAdvantages/Disadvantages
• Advantages− MAC’s are much easier and less costly− Administration time and costs are lower− Increased port utilization and efficiency− Based upon TIA/EIA TSB-72− Less space utilized in Telecommunications closets− Quick path for network migration− Fewer points of failure
• Disadvantages− Initial installation costs− Higher cost of optical electronics− Perceived single point of failure
Home Run Cabling
TelecommunicationsCloset
Single-UserCable & Outlets
•Splice or Pull Thru for CNA
•Cross Connect and Electronics for DNA
Zone DistributionAdvantages/Disadvantages
• Advantages− Reduced costs over life of cabling due to less re-cabling
− cabling from TC to distribution point stays permanent
− Faster MACs− Less office disruption− Less down-time and productivity loss during MACs
• Disadvantages− Initial installation costs− Perceived lower performance due to additional connection
point
MHz vs. Mbps
100 MHz is NOT the same as 100 Mbps
• Bandwidth (MHz) is:− The frequency range across which components and systems are
specified− Not based on a particular application or data rate
• Data Rate (Mbps) is:− How fast you can pump data through a system with a given
bandwidth− Dependent on the application and encoding scheme
MHz vs. Mbps
Frequency = 1 Car /sec (Hertz)Transferred Data = 1 Bits /sec (Bps)A B
Frequency = 2 Car /sec (Hertz)Transferred Data = 2 Bits /sec (Bps)A B
Frequency = 2 Car /sec (Hertz)Transferred Data = 6 Bits /sec (Bps)A B
A BFrequency = 2 Car /sec (Hertz)Transferred Data = 12 Bits /sec (Bps)
Media Options
• Unshielded Twisted Pair− Categories 3/4/5/6
• Shielded Twisted Pair− Categories 3/4/5/6/7− FTP, S-FTP or PiMF
• Optical fiber− Multi-mode
− 62.5/125 or 50/125− Singlemode
Evolving HorizontalPlatform Cabling Platforms
20001996199219881984
1000 1000
100
10
1
100BASE-Tx
16 MbpsTokenRing
10BASE-T
CAT4CAT4 CAT5CAT5CAT3CAT3
?
622 Mbps ATM ?
1000BASE-T
CAT XCAT X
100
10
1
155 Mbps ATM
MbpsMHzBandwidth Data Rate1.2 Gbps ATM ?
Evolving BackboneNetwork Cabling Platforms
10BASE-F
FDDI155 ATMFastEthernet
622 ATM
1000 Base-F1.2 Gpbs ATM
10,000Mb/s
Data Rate
?2.5 Gpbs ATM
20001997199419881984
?MHz•kmBandwidth
500
160MM
SM
1,000
100
10
1986