Designing Premises Cabling Systems · Structured Cabling Systems Network Specific Cabling System A specified cabling system designed to be installed according to a manufacturer's

DesigningPremises

Cabling Systems

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 Distribution Cabling

MUO

CP

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

Architectures

Zone

Home Run

Zone

DNAor

CNA

Equipment Room/Entrance Facility

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

Media Selection Criteria

UTP

OpticalFiber

STP

Good Good Good Good Best Good

Better Good Better Better Better Better

Best Best Best Best Good Best

EMC Distance Bandwidth NetworksSupported

InitialCost

Long TermCost