Cable Management

• DATA CABLE IS SUSCEPTIBLE TO DAMAGE

• INSTALLING CAT5 CABLE DOES NOT GUARANTEE CAT5

PERFORMANCE

• HOW CABLE IS INSTALLED, NOT ONLY WHAT TYPE OF

CABLE IS INSTALLED

• IF CABLE NOT INSTALLED PROPERLY

PROBLEMS WITH

– ATTENUATION

– NEXT

– PS NEXT

– FEXT

– PS FEXT

• ANSI/TIA/EIA-568-A 10.6.3.2 SPECIFIES

– APPROPRIATE CABLE MANAGEMENT MUST BE USED TO

ELIMINATE

• CABLE STRESS • UNTWISTING OF PAIRS

• CABLE CINCHING • TWISTING OF CABLE

– CABLE MUST ALSO BE INSTALLED TO MANUFACTURES

SPECIFICATIONS

SURFACE RACEWAY

• COVERED BY EIA/TIA-569 SECT.4.7

• LISTED IN FOUR (4) SUBGROUPS :– SURFACE RACEWAY

– RECESSED RACEWAY

– MOLDING RACEWAY

– MULTICHANNEL RACEWAY

• AGAIN CABLE MUST

– NOT BE PUT UNDER STRAIN

– MAINTAIN A MINIMUM BEND RADIUS

– BE SUPPORTED (REGARDLESS OF TYPE)

– BE IN A SUITABLE ENVIRONMENT

– PROTECTED FROM EMI (e.g. RFI) (COPPER ONLY)

(BOTH COPPER & FIBRE)

DON’TS

• NEVER PULL CABLE DIRECTLY ACROSS SUSPENDED CEILING

TILE OR ACROSS FLORESCENT LIGHT BOXES (EMI)

• CABLE SHOULD NOT BE TIED TO CEILING GRIDWORK WIRES

WHAT NOT TO DO

MANAGEMENT TYPES

• THERE ARE VARIOUS DIFFERENT TYPES OF CABLE MANAGEMENT EACH GIVING DIFFERENT DEGREES AND TYPES OF PROTECTION

CABLE TIES

• USED TO SECURE CABLE TO TRAYS, TRUNKING ETC.

• NYLON, POLYPROPYLENE

• RELEASABLE, NON-RELEASABLE

• RIBBED INNER SURFACE TO SECURE CABLE

“J” HOOK BENEFITS

• DESIGNED FOR “HIGH PERFORMANCE” CABLE

• USED SPARINGLY OVER SHORT RUNS

• LIMITS THE NEED FOR CABLE TIES

“J” HOOKS SHOULD NOT BE USED AS A REPLACEMENT FOR CABLE TRAY

D-RINGS

• AS WITH J-HOOKS

• FOR SMALL BUNDLES OF

CABLE

• USED SPARINGLY OVER

SHORT RUNS

A

B

• THE J-HOOKS ARE NOT ADEQUATE SUPPORT HERE

• THE CABLE IS UNDER STRESS AT POINTS A & B

CABLE LADDER

• GALVANISED STEEL OR PVC

• CABLE SECURED AT RUNGS

CABLE LADDER

• WITH LARGE BUNDLES CABLE UNDER PRESSURE AT RUNGS BECAUSE ITS WEIGHT IS NOT DISTRIBUTED ALONG A RUN

AS WITH CABLE LADDERS CABLE WEIGHT NOT EVENLY DISTRIBUTED. BASKET IS CHEAPER AND EASIER TO INSTALL THAN LADDER

CABLE BASKETS

SNAKE TRAY

• SIMILAR TO CABLE BASKET

• FLEXIBLE

• EASIER TO INSTALL?

• FLEXIBLE

CABLE TRAYS

• GALVANISED STEEL OR PVC

• VARIOUS DIMENSIONS

• MAY BE RESIZED WITH

HACKSAW

• ANGULAR INSERTS AVAILABLE

CABLE TRAYS

• PERFORATED BOTTOM

• HORIZONTAL & BACKBONE

• FLEXIBLE

• EASY ACCESS TO CABLE

• CURVED TRAYS

• SUPPORTS WEIGHT OF CABLE

ALONG WHOLE RUN

CONDUIT

• COMPLETELY ENCLOSED

• NO REMOVABLE LID

• GALVANISED STEEL PVC

• ACCESS TO CABLE LIMITED

CONDUIT

• EMI PROTECTION

• OUTLET DENSITIES LOW

• MEDIUM TO LONG TERM

• NEAT & AESTHETIC

TRUNKING

• SIMILAR TO CABLE TRAY BUT

• REMOVABLE LID (BETTER PROTECTION) (EMI & RODENT)

TRUNKING

• MORE DIFFICULT TO CUT (LID)

• NEATER

RACEWAYS

• SIMILAR TO TRUNKING

• VISUALLY PLEASING

• EASILY MODIFIED

• POWER AND DATA CABLING

POWER AND DATA SEPARATION

MIN BEND RADIUS

A

• DROPOUT PIECE ENSURES MIN BEND RADIUS IS MAINTAINED

• PRESSURE AT RUNG A IS ALLEVIATED

CABLE TRAY ASSEMBLIES

What is EMI?

• ELECTRO MAGNETIC INTERFERENCE– DESCRIBES ALL KINDS OF ELECTRICAL AND MAGNETIC

INTERFERENCE

• EMI IS A FIELD THAT EMANATES FROM ‘LIVE’ CONDUCTORS

– CAN TRAVEL LARGE DISTANCES AND INTERFERE WITH OTHER CONDUCTORS

• RFI (RADIO FREQUENCY INTERFERENCE)– 98FM CAN INTERFERE WITH CONDUCTORS

Sources of EMI

• SOME ‘LIVE’ CONDUCTORS CAN CAUSE MORE

INTERFERENCE THAN OTHERS

– DEPENDS ON SEVERAL FACTORS, SUCH AS THE AMOUNT OF

CURRENT THEY ARE CARRYING AND THE AMOUNT OF SCREENING

AROUND THE CONDUCTOR

• FLUORESCENT LIGHTING, SUBSTATIONS, MOTORS, SWITCH

MODE POWER SUPPLIES

Vulnerability

• SOME CONDUCTORS CAN PICK UP INTERFERENCE MORE EASILY THAN OTHERS

– UTP IS PARTICULARLY VULNERABLE TO PICKING UP EMI

– SCREENED CONDUCTORS OR CONDUCTORS IN EARTHED ENCLOSURES ARE LESS VULNERABLE BUT HAVE TO BE CAREFUL

– FIBRE IS IMMUNE TO EMI

EN 50174

• MAKES THE FOLLOWING RECOMMENDATIONS

En 50174

• EUROPEAN STANDARD SUBMITTED TO CENELEC

• THREE PARTS– SPECIFICATION– IMPLEMENTATION – OPERATIONS

OF INFORMATION TECHNOLOGY CABLING,BOTH COPPER & FIBRE}

• EMI PERFORMANCE DIFFERS WITH THE DIFFERENT TRAY TYPES

• THE BUNDLE HEIGHT INTO THE CABLE TRAY SHALL BE LOWER THAN THE SIDE WALLS AS ILLUSTRATED ABOVE

• OVERLAPPING LIDS PROVIDE MORE PROTECTION

• DEEP CONDUITS ARE PREFERRED

CABLE SUPPORT

• PROPER CAT 5 PERFORMANCE WILL ONLY BE ACHIEVED WITH

CAREFUL CABLE INSTALLATION AND ADEQUATE SUPPORT

• MAKE SURE “YOUR” INSTALLATIONS ARE NOT PART OF THE 80 %

THAT WILL NOT SUPPORT TRANSMISSION IN THE FUTURE OF 100

Mbps AND BEYOND