RCDD 12TH EDITION CHAPTER 6 WITH 100% CORRECT ANSWERS 2024 LATEST UPDATE

A backbone star topology shall have no more than Two levels of cross-connections Connection between any two HC's (FD's) shall not pass through more than Three cross-connections Direct connections between TR's are allowed if Backbone distribution system is expected to meet the requirements for a bus topology or ring topology configuration Campus back bone Most affected by physical considerations (duct availability, right of way, physical barriers The MC/CD should be Close to (in not located in) the main ER Physical ring is seldom recommended Primary reason for considering a physical ring is a redundant cable path for disaster recovery The typical design for a conduit system that provides Physical ring topology would dedicate some of the optical fibers to a ring and some of the optical fibers to a star TR Is a space (architectural space) TE Is a case or housing TR/TE Is the point where the backbone cabling interfaces of the horizontal cabling Vertically align TR's in multistory buildings Whenever possible Often the most cost-effective transmission medium for - Data systems is optical fiber - Voice systems is balanced twisted pair where remote telephone switch nodes or IP telephones are deployed, optical fiber may support voice systems The choice of transmission media may depend upon the application, the factors to be considered include the: - Flexibility of the medium with respect to supported services - Required useful life of backbone cabling - Site size and user population Campus backbones (OM1 fiber) Dis: 2km [1.2mi] Rate speed: 155 Mb/s Campus Backbones (OM2 fiber) Dis: 55m [1804ft] Rate speed: 1Gb/s Building backbones (OM2 fiber) Dis: 300m [984ft] Rate speed: 1Gb/s Building backbones (OM3 fiber) Dis: 300m[984ft] Rate speed: 10Gb/s Campus/building back bones (OS1 fiber) Dis: 2000m[6560ft] Rate speed: 10Gb/s Campus/building back bones (OS2 fiber) Dis: 10 000m[32,800ft] Rate speed: 10Gb/s Two recommended MM optical fiber 62.5/125um Or 50/125um core cladding diameter Singlemode 1310nm wavelength region and can be used in the 1550 region both analog/digital transmission Recommended balanced twisted pair 24AWG up to 22AWG round, solid copper conductors impedance of 100 ohm Campus backbone cable size 19AWG, 26 AWG, 22 AWG, at 100 ohm Vertically aligned TR's with connecting sleeves or slots are The most common type of back-bone pathway The advantage of using vertically aligned TR's is flexibility because - Backbone cable sheath is accessible on each floor - Circuits can be distributed as required Sleeved and slots Must Not obstruct wall terminating space Slots with a minimum 25mm [1in] high curb Sleeves to extend a minimum 25mm [1in] AFF level 5 conduits for 40,000 sq ft or more floor space Slots are typically Flush against the wall within the floor space and should be designated at a depth 150-610mm [6-24in] The size or the pathway using slots should be one slot size 0.46 m-sq [5ft-sq] for up to 4000m-sq [40,000ft]sq of usable floor space served by that backbone distribution system Do not locate backbone cable pathways In elevator shafts Heavy cable that is improperly supported can cause - Slippage between the cable pairs and the sheath - Stretching of the copper conductors - Broken optical fibers Steel strand used for Supporting riser cables are available in various sizes ranging from 6.3m [0.25in] to 22mm [0.87in] Insert cable ties to secure backbone cable through the layers Place the ties approximately 1m [3.28ft] apart with a minimum 3 ties per floor The most common application for optical fiber backbone cabling is Multiplexed transmission Multiplexing equipment in TR's and ER's Combines signals from many end points for transmission over two strands Indoor hardware Is more varied than outdoor hardware Key points to consider Mounting and design Indoor hardware is divided into two applications areas based on the mounting location - Rack mounted -Wall mounted There are three design factors to consider for indoor hard ware - Splicing hardware - Terminating hardware - Patch panels Splicing hardware is determined by - Mounting requirements - Optical fiber count - Splicing method To specify terminating hardware the four factors that must be known - Location - Optical fiber/type - Terminated method - Strand count Indoor Multimode fiber is generally used for campus or building application due to Cost effective transceivers, how ever SM fiber should be considered to support extended distances of high speed applications and broadband video Outdoor fiber loose tube 250m Cables manufactured with fiber glass rods aramid yarn known as All-dielectric cabels Cables with steel strength members or steel amoring Require proper bonding Nonconductive backbone optical fiber cables have a minimum bend radius - 10 times the cable's outside diameter when no load - 15 times the the cable's outside diameter when being pulled