(6 line)

PHN 13: TRUYN HNH CPPART 13: COMMUNITY ACCESS TELEVISION1. TNG QUANGENEARAL

1.1. M tFunctional description

Chng ny ch bao gm mt h thng cp n gin v cc thit b thu ca h thng MATV. A simple cabling system and MATV reception equipment are covered under this scope.1.2. Tham chiu cho

Cross references

Tng qut

General

Ph hp vi chng: Nhng yu cu chung. Comply with the General requirements worksection. Nhng chng lin quan Related worksections Tham chiu n cc chng sau:Nhng yu cu chung v in, Dy cp in v dy dn, H thng ng in v thang mng cp Refer to the following worksections: Electrical General Requirements, Power Cables, Cable Support & Duct Systems

1.3. Thit k

Design

Cc bn v DrawingsCc bn v cho hp ng ch a ra nhng qui lut thit k tng quan v thit k. Contract drawings show generic design principles and design intent only. Cc yu cu v h thng System requirementsLoi h thng: Thu qua cp (CATV) System type: Cable (CATV)) Yu cu chung ca h thng

General MATV System Requirements

H thng MATV s gp v hn th na cc tiu chun tng qut sau: The MATV system shall meet or exceed the following general criteria: Khng c s gim st v cht lng hnh nh t u vo h thng MATV n bt k mt im phn phi MATV no khc. There will be no visible degradation of picture quality from the MATV systems input to any MATV distribution point Vic o lng tiu chun cho cng tt ca tn hiu s c kim tra bi ng h o cng tn hiu. The standard measurement instrument for signal strength will be a calibrated signal strength meter. H thng s c thit k theo h thng c hai ng truyn,chng hn nh u hi nh The system will be designed as a two- way capable system, i.e. sub split return. ch no c nhn c tt c cc knh sng UHF s c chuyn i thnh sng VHF phn phi cho ton b h thng MATV. Where possible all UHF channels shall be converted to VHF for distribution on the MATV system. H thng s pht i cht lng m thanh ni. The system shall broadcast stereo quality audio. Cc yu cu k thut phn phi h thng MATV

MATV Distribution System Specifications p ng tn s ca h thng ( ngoi tr cc b khuch i) s c tn s t 5.0 Mhz ti 1000 Mhz vi tn tht bnh thng. The frequency response of the system (excluding amplifiers) shall pass 5.0Mhz to 1000 Mhz frequencies with nominal loss. p ng bin cho hnh nh ca h thng ny s l 4 dbmv so vi nghing bnh thng ca cp nh c trnh by. The amplitude response for this spectrum shall be 4 dbmv with respect to the line represented by normal cable tilt. H thng s c thit k l h thng c hai ng truyn(ng truyn hi). The system shall be designed as two way capable (split return). Cp truyn i c th o c trong mi phng s khng thp hn 2 dbmv. Visual carrier level in each room shall be no lower than 2 dbmv. Khang thay i gia bt k hai knh k cn nhau s khng vt qu 2 dbmv. The variance between any adjacent channels shall not exceed 2 dbmv. Khang thay i gia bt k hai knh khng k cn nhau s khng vt qu 12 dbmv hay 3 dbmv trn 105 Mhz ca bng thng. The variance between any non adjacent channels shall not exceed 12 dbmv or 3 dbmv per 105 Mhz of bandwidth. cch m t phng ny ti phng kia s ln hn 20 dbmv. Room to Room isolation shall be greater than 20 dbmv i vi cc h thng i trong cc mng hp c nhiu nhnh r, cch m RF s l 60 dbmv gia mi mng hp. For multiple trunk systems, RF isolation shall be 60 dbmv between each trunk. T s n truyn i c th o c trn bt k knh no ti thiu s l 45 dbmv ti bt k v tr no. u ra TV ( 50 n 60 dbmv l tt nht ) S phn x trong h thng s l ln hn 40 dbmv tng ng vi s tryn ti hnh nh. Visual carrier to noise ratio on any channel shall be at a minimum of 45 dbmv at any TV outlet (50 to 60 dbmv optimum). Reflection in the system shall be greater than 40 dbmv below the respective picture carrier. Cc b mc r tn hiu,b chia cc thit b th ng khc s c ng kn han tan khi s dng kim lai kn hay nhm c lm gim thiu s bc x hay s thm nhp t bn ngai. Taps, Splitters and other passive equipment shall be totally shielded using a sealed metal or aluminium cast to minimise radiation and ingress. Cc u ra lai PAL hay Balum s khng c s dng trong h thng ny.Cc u ra ring bit c ko dy tn hiu ti t cc im r nhnh xa s c chm dt ti u ra T.V nh cc u ni F-81 hay F-Barrel.Tt c cc u ni s l lai F mt u. PAL or Balum type outlets shall not be used within the MATV system Individual outlets fed from remote tap points shall be terminated at the TV outlet using F-81 or F-Barrel connectors. All connections shall be one piece F type connectors. Cc b chia v b r nhnh c s dng s c thit k c tn s t yu cu t 5.0 Mhz ti 1000 Mhz (hay lnhn).Nu b r nhnh cui cng trn hp i dy chnh m vic i dy khng chm dt ti y, mt thit b cui 75 Ohm s c lp t bt u dy. Taps and Splitters used shall be designed to pass 5.0 Mhz to 1000 Mhz (or greater). If the last Tap on the riser is not a terminated tap, a 75 Ohm terminator shall be installed to terminate the end of the line. Tt c cc u ra trn bt k thit b no s c bt u li vi in tr l 75Ohm. All unused ports on any device shall be termination in 75 ohms. B iu khin trung tm ca h thng MATV MATV head endu u ni chnh ca h thng MATV s c hay hn th na cc tiu chun k thut sau: The MATV head end shall meet or exceed the following criteria: B chuyn i qua li gia cc tn hiu UHF v VHF s l b iu khin bng thy tinh rn, c lc th v c dung sai 5Khz so vi u ra tn s mong mun.

Level sufficient to be within the range of the AGC in the channel processor.UHF and VHF converters shall be solid state, crystal controller, saw filtered and within 5Khz of the desired output frequency. Tr khng u vo, u ra s l 75 ohm. Input and output impedance shall be 75 ohms. u ra ca cc b khuch i dng ri, b iu ch, b chuyn i hoc b x l knh s c kt hp li nh phng php cng ngh m cung cp cch m ti thiu l 30 dbmv gia cc sng mang ring l. Output of individual strip amplifiers, modulators, converters or channel processors shall be combined using a methodology which provides a minimum of 30 dbmv isolation between individual carriers. Cc knh k cn s khng c kt hp theo kiu ny.Cc hng mc c cch m t hn 30 dbmv s khng c s dng mi trng trung tm kt hp cc tn hiu. Adjacent channels shall not be combined using the same combiner.Items providing less than 30 dbmv of isolation shall not be used in the head end environment to combine signals. Cc b khuch i c di bng rng vi di tn s t 5.0 Mhz ti 1000Mhz( hay ln hn) v c trang b vi thit b hi ph, s c dng khuch i tn hiu ngun chnh. Broadband Amplifiers with a bandwidth of 5.0 Mhz to 1000 Mhz (or greater) and equipped with sub split return shall be used to amplify the cable feed. Cc b khuch i s c thit k c kh nng c hai ng truyn nh s dng thit b hi ph. Amplifiers shall be designed for two way capability using sub split return. Hng truyn i s s dng 45.0 Mhz ti 1000 Mhz (hay ln hn) Forward Direction shall utilise 45.0 Mhz to 1000 Mhz (or greater). Hng hi v s s dng 5.0 Mhz ti 30.0 Mhz (hay ln hn) Return Direction shall utilise 5.0 Mhz to 30.0 Mhz. Hng truyn i bao gm c hai b iu khin : iu khin nghing v iu khin tng li. The forward direction is to include both gain and tilt controls. ng hi v s c cc ph kin cn thit cho vic khuch i. The return path shall have provisions for build in amplification. C ng truyn i v ng hi v s c gn thit b b suy gim v to s cn bng.Both forward and return paths shall have plug in equaliser and attenuation capability. p ng gia tn hiu sng mang hnh v tn hiu o s ln hn 46 dbmv. p ng gia tn hiu sng mang hnh v tn hiu ngang s l 51 dbmv hay ln hn. Visual Carrier to Spurious signal response shall be greater than 46 dbmv. Visual Carrier to Cross Modulation shall be 51 dbmv or greater. Lng sng mang hnh/m thanh trn bt k knh truyn no s l 15 dbmv 2 dbmv.p ng bin trong bt k knh tivi n no (sng mang hnh so vi sng manh m) s l tng thm (2 dbmv). Visual/Aural carrier ration on any channel shall be 15 dbmv 2 dbmv Amplitude response within any single TV channel (visual carrier to aural carrier) shall be flat (2 dbmv).2. CHT LNG

QUALITY

2.1. Tiu chun thc hin

Performance criteria

B iu khin trung tm Headend Loi: a knh v t ng iu chnh li cho FTA. Type: Multi-channel & Manual gain control for FTA Ng vo b iu khin trung tm v cc b khuch i Input to headend and amplifiers Mc tn hiu ca knh: 60dBV Channel signal level: 60 dBV. S cch ly ln nhau gia h thng cc ra 36 dB trong phm vi bng tn 5MHz n 862 MHz, trong hoc gia ta nh. Mutual isolation between system outlets 36 dB within the band 5 MHz to 862 MHz, within or between premises. Cc mc dy tn hiu ca h thng ra 60 dBV v 90 dBV, tt c mi thi im.

System outlet range of levels 60 dBV and 90 dBV, at all times. Cc mc tn hiu ca h thng cm 63 dB cho tt c cc knh System outlet levels 63 dBV for all channels.2.2. Trnh duyt

Submissions

Cc tn s ca h thng System frequencies Phi trnh duyt tn s thit k. Submit design frequencies for approval. Bo co cht lng ng thu Reception quality report Phi trnh bo co cht lng ng thu, vin dn cc phng php s dng xc nh. nh a ch tt c cc tn hiu m h thng thu c. Submit reception quality report, citing methods used for determination. Address all signals that the system is to receive. Bao gm cc chi tit sau:Cc bn v thi cng v bng tnh Shop drawings and calculations Include the following: Cc bn v trnh by h thng s khi, a ra v tr ca tt c cc thnh phn cu kin v s ni cp. Drawings showing the system block diagram, proposed location of all components and interconnecting cabling Cc mc tn hiu tnh ton cc ra v ng vo, ng ra ca cc b khuch i, cc b chia v mc r tn hiu.Calculated signal levels at outlets and at the input and output of amplifiers, splitters and taps. S model v nh sn xut ca cc thnh phn cu kinMake and model number of The English language version prevails.components. Cc loi An-ten v phng php lp t. Antenna types and their method of mounting. Ti liu k thut sn phm Product data Phi trnh ti liu k thut sn phm cho tt c cc thnh phn cu kin.Submit product data for all components. Cc ph thu tn hiu v giy php Licencing & reception fees Phi trnh duyt tt c n xin giy php v cc ph thu chng trnh t v tinh, bao gm c ph cho 12 thng.Submit all licencing application and satellite reception fees for approval, included fees for 12 months.2.3. Mu vt t

Samples

Cc thnh phn cu kin Components Phi trnh cc mu vt t v cp, ra, cc b chia tn hiu, Submit samples for cabling outlets, splitters, tap installations etc Tt c cc thit b, ph kin... l ra theo nh cc mu s dng trong phng trng by (nh mu) tr khi c ph duyt khc i. All exposed equipment/ accessories ... are to match the samples used in the existing showroom (sample house) unless otherwise approved.3. CC THNH PHN CU KIN V VT T

MATERIALS AND COMPONENTS

3.1. B phn phi tn hiu MATV t h thng x l trung tm

MATV distribution unit

B phn phi tn hiu trung tm bao gm: The central distribution unit is to consist of: Hai b gi ng thit b 19 cao 72 2 off 72 high 19 rack with cabinet, lockable, containing the following, Cc m-un x l tn hiu cho i pht thanh mt t v cc bng tn pht thanh FM.Signal treatment modules for and FM radio bands Cc b cng tn hiu.Multiplexers, transponders & other equipment Cc b khuch iAmplifiers Cc u gii m/ b nhn tn hiu k thut s cho cc knh v tinh.Decoders/ digital receiver for satellite channels Cc ng vo thit b hnh nh v m thanh.Audio & visual equipment inputs Thit b cp knh cho tng cn h Channel supply equipment to each apartment3.2. Cc b khuch iAmplifiers

Cc b khuch i phi ph hp theo:Amplifiers shall comply with the following: li 40 dBa hoc cao hnGain 40 dB or higher T ng hoc bng tay iu chnh li Automatic or manual gain control Ng ra cao nht 120 dBV hoc tt hnMaximum ouput of 120dB microvolt or better n < 5 dB Noise figure < 5dB Tn tht ng hi 25 dB ng vo v ra hoc tt hn Return loss ration 25 dB at the input and output or better Tr khng ng vo v ra 75 ohmsInput and output impedance 75 ohms Dng loi Blankom hoc loi tng ng c ph duyt.Equal to Blankom or approved equivalent.3.3. Cc b iu ch & gii iu chModulators & demdulators

Dng cc b iu ch v gii iu ch cho cc knh a phng trnh hin tng hnh c bng. Use modulators and demodulators for local channels to avoid ghosting.3.4. An-tenAntenna

Tng qut

General

C cu trc cc chi tit bng thp khng r. Constructed from stainless steel elements Ph hp vi cc iu kin v kh hu v thi tit. Suitable for the atmospheric and climatic conditions. C th tip cn bo tr.Accessible for maintenance. Cung cp trn gi vi vi dy chng tr .Complete with bracing wires. An-ten TV thu tn hiu t mt tTerrestial TV Antenna Ph hp vi vic thu nhn tn hiu cc knh truyn hnh a phng.Suitable for reception of local television channels.3.5. B chia ngun tn hiu

Power splitter

c im k thut (cc gi tr in hnh) Specifications (typical values) Dy tn s vo: 950 2150MHz Tng tr ng vo/ra: 75 (F-conn) Tn tht ng phn phi: 12 dB Input frequency range: 950... 2150MHz Input/output impedance: 75 (F-conn.) Distribution loss: 12 dB Tn tht ng hi ng vo; 12 dB Tn tht bo v cc ng ra: 22 dBInput return loss 12dB Outputs protection loss: 22dB Bc chng nhiu: 65 dBScreening: 65dB Ngun cung cp: 230 ~ V (+6/-10%) 50/60 Hz c cp mm v phch cm v/ hoc b nn ngun DCPower supply 230~V (+6/-10%), 50/60 Hz, flexible cable&plug or/and DC adapter Cng sut tiu th max: 14 WPower consumption max: 14 W Cp bo v: II (DIN-VDE 0860) Loi bo v: IP 30 Class of protection: II (DIN-VDE 0860) Type of protection: IP 30 in p ng vo thung trc: 13V, 15V hoc 17V max.Permanent input voltage: 13V, 15V or 17V Max Cng sut tiu th: 300 mAPower consumption: 300mA Dy nhit : -10C - +40CTemperature range: -10C...+50 m khng kh tng i: Max 60% Relative air humidity: Max 60%3.6. Cc b chiaSplitters

Cc b chia c nhiu ng c th hin trn bn v vi tn tht chia nh hn 3.5 dB (ln hn I vI 4,6,8 ng). Tng tr ng vo v ra l 75 Splitters shall be x-way as shown on the drawings, with insertion loss of less than 3.5 dB (greater for 4,6,8-way). Input and output impedance of 75 ohms.3.7. Cp ng trcCoaxial cable

Cc loi TypeTng qut: Ti thiu dng loi cp c 3 lp v bc, 75C, loi nhiu tao, c cht cch in PE, v bc PVC General: Minimum tri shield, 75 deg C, stranded conductors, PE dielectric, PVC jacket Kch c cp Cable Size S dng cp dy tn s cao nh th hin trn bn v Provide high frequency band cable as shown on drawing Cp RG11 v cc kch thc 0.500 c dng chy trong mng cp m chiu di vt qu 200 feet (60m).RG11 and 0.500 sizes are to be used for trunk runs, which exceed 200 feet (60m). RG6 c dng chy trong mng cp, m chiu di phi ngn hn 200 feet (60m)RG6 is to be used for trunk runs, which are shorter that 200 feet (60m) Cp 0.500 inches c dng trong cc h thng xp tng. 0.500 Inches cable to be used in cascaded systems. in tr dy dn (20C) ( /km) Conductor resistance (20C) ( /km) in p chu ng (ACV/min)Withstand voltage (ACV/min) Thng s in c trng Electrical data Cp ng trc RG-59/U RG-59/U cable Tr khng danh nh Insulation resistance (M -km) in dung danh nh Nom. Cap. Dy ni chnh Coaxial connectors Nom. D.C.R. D.C.R. danh nh V bc cch in

V bc mng

Bin

MHzdb/100'

Khi lng Weight Cc u ni ng trc Coxial cable Cc u ni khng hn c tr khng l 75 c thit k ring cho tt c cc kch c cp s c s dng. Solderless 75 Ohm Impedance Coaxial Cable Connectors specifically designed for the cable size shall be provided, Tt c cc u ni s c dng bi dng c un m dng c ny c thit k ph hp vi cc cu trc v c mc ch s dng u ni.All connections shall be made using a crimp tool designed consistent with connector construction and intended use. Cc u ni F c yu cu. u ni sit vis hoc cc loi u ni c vng un tch bit s khng c dng trong h thng ny.F connectors are required. Screw on or separate crimp ring type connectors shall not be used in the system. Loi dng c un: loi 6 v 11. Khng dng loi: Crimp type: Series 6 and 11. Do not useVn xon hoc loi s dng

Twist-on or type employing a separate

Vng un tch bit sit cht cho lp bn ca cp.

Crimp ring to secure the outer braid of the cable.

Cc cm Outlets S dng cc ph kin trong phm vi ca cc nh sn xut ny v trnh cc phng n chn la v ph duyt. Loi bng: Gn phng phng Tr khng: 75 Allow for fittings within the ranges of these manufacturers and submit alternatives for selection and approval. Plate type:Flush mount Impedance: 75 ohm C t blocking mi cm Blocking capacitors at each outlet. Tn tht u vo: < 1.5 dB Insertion loss:less than 1.5 dB Cc yu cu chung v cp General Cable Requirements Kim tra nhanh mi cun cp ng trc v truyn dn v cu trc, tn tht ng v s c thc hin dy tn 5 Mhz 1000 Mhz bi nh sn xut. Sweep testing of each reel of coaxial cable for transmission and structural return loss shall be performed over the 5Mhz to 1000 Mhz range by the cable manufacturer. Sao chp li cc kt qu th nghim, cung cp km theo vi cp. Hard copy of the test results will be provided with the cable. Cc yu cu v cp Cabling Requirements Tn s ti thiu c th chp nhn p ng vi bt k cu kin thnh phn no trong h thng l: The minimum acceptable frequency response of any component on the system shall be: 5 Mhz 1500 Mhz (b ng)

5 Mhz to 1500 Mhz (Passive)

5 Mhz 1000 Mhz (ch ng)

5 Mhz to 1000 Mhz (Active)

p ng bin trn dy tn ny phi l 4 dbmv i vi nghing bnh thung ca cp c trnh by Amplitude response over this range shall be 4 dbmv with respect to line representing normal cable tilt. Cp phi l loi ng trc c tr khng 75 nm trong dy tn 5 Mhz 1000 Mhz Cable shall be 75ohm Impedance from 5 Mhz to 1000 Mhz Li cp phi l loi ng cng (hoc ng c lp thp bao ph) Cable centre construction shall be solid copper (or copper clad steel) Cht cch in mi ca cp gm c Cellular PolyethylenneCable Dielectric Insulation shall consist of Cellular Polyethylene. Cp phi c cung cp bi hai lp v bcCable to be provided with 2 Shields: Lp v th nht gm c.002 inch hai lp v nhm c ph Nylar hoc polypropylene bng 1/8 inch gi chng ln ranh gii in miFirst Shield consists of.002 inch double aluminium coated Nylar or polypropylene tape with 1/8 inch overlap bound to dielectric. Lp v th hai gm c t nht 60% mc bao ph ca lp bn 34 AWG dy nhm hoc dy ng ./ Second Shield consists of minimum 60% coverage of braid 34 AWG aluminium or tinned copper wire. V bc cp phi c lm t Polyvinyl chloridehoc Teflon khng gy nhim nhit thp. Cable Jacket to be made of non contaminating low temperature polyvinyl chloride or Teflon. Cp PVC c bc trong ng hoc ngoi ng. Tuy nhin, khi dng bn trong khch sn phi l loi cp plenum. PVC jacketed cable for inside conduit/outside conduit. However, inside Hotel should be plenum type cable.

Cp dng bn ngoi s c bc vi 67% hoc ln hn loi cp c v bc. Outside Cable will be shielded with a 67% or greater cable shield

3.8. ng in

Conduit

Kch c

Size

Tng qut: Khng s dng ng c ng knh ngoi < 20mm General: No conduit should have an outside diameter of less than 20 mm.

ng cng Rigid conduits Cung cp ng in chy di thng, u v khng b lng, c g hay sc cnh. Khng dng ng c cc gp khc.Provide straight long runs, smooth and free from rags, burrs and sharp edges. Do not use conduit elbows.

Trng km GalvanizingCung cp ng trng km, kp, gi nhng v tr m thp. Provide galvanized conduit support clips for damp locations. Trng by Set outNu l ra ch nhn thy c, lp t ng in chy song song v phi tht vung gc khi i hng. If exposed to view, install conduits in parallel runs with right angle changes of direction. Dy ko mi Draw cords Tng qut: Cung cp dy ko mi trong ng in d tr. d 1 mt dy cun trn li u cui ca ng in.General: Provide draw cords in conduits not in use. Leave 1 m of cord coiled at each end of the run. Vt t: Dy Polypropylene hoc dy tip t nhiu tao c bc cch in tit din ti thiu l 2.5 mm2. Material: Polypropylene cord, or insulated stranded earth wire, 2.5 mm2 minimum size. Cc hp ko dy Draw-in boxes Tng qut: Cung cp hp ko dy khong cch khng qu 30m cho nhng ng in chy thng v nhng ch thay i cao hoc nh hng.General: Provide draw-in boxes at intervals not exceeding 30 m in straight runs, and at changes of level or direction. Hp ko dy chn ngm: s dng loi np c m kn v lm kn hp chng hi nc. Underground draw-in boxes: Provide gasketted covers and seal against moisture. ng in t m Concealed routes ng c m trong rnh tng, c vo trong tm sn hoc c lp t nhng v tr khng th n gn c: Chy trc tip gia cc im ni, gim thiu s ng in v im ni. Khng lp t cc ph kin phc v cng tc kim tra. Conduits concealed in wall chases, embedded in floor slabs or installed in inaccessible locations: Run directly between points of termination, minimising the number of sets. Do not provide inspection fittings. Cp c lp t bn trong mi hoc di sn g: Lp t cp chc chn vi kp, gi trnh cp b bc ln hay ri xung. Cabling installed within roofs or under timber flooring: Secure with cable clips to support beams to prevent cables being stepped upon or coming loose. ng in trong sn b-tng Conduits in concrete slabs Tuyn ng in: Khng c chy ng in trn lp mt b-tng. Khng chy trong nhng vng cng cp kt cu, ct ngang vung gc nhng vng cng cp kt cu. Chy cc tuyn dy cp trnh cho nhau v gim ti thiu s lng ng in bt k v tr no. ng t song song cch nhau ti thiu l 50 mm mi bn.Route: Do not run in concrete toppings. Do not run within pretensioning cable zones; cross pretensioning cable zones at right angles. Route to avoid crossovers and minimise the number of conduits in any location. Space parallel conduits at least 50 mm apart. Chiu su chn ti thiu: bng ng knh ng in hoc 20 mm. Minimum cover: Conduit diameter or 20 mm. Kch thc ng in: ng knh ti a l 25 mm. Trnh h xi-mng ri vo S lp cht: Gn trc tip trn b mt ca y lp gia c ni m cc ng in i qua pha trn ca lp gia c Conduit size: 25 mm maximum diameter. Prevent ingress of slurry. Fixing: Fix directly to top of the bottom layer of reinforcing where the conduits pass above a single layer of reinforcing. Nhng tn sn cm t ng in. Khng chy ng in trong mt sn ca phng ni hi, phng my v b cha Do not install cable directly into any solid structure. Do not run conduits in the floor slabs of boiler rooms, plant rooms and tank rooms. Nhng sn gch khi rng Hollow-block floors t ng in cc on l c kn b- tng/ va ca sn bng gch c l c trc.Locate conduits in the core-filled sections of precast hollow-block type floors.4. THI CNG

EXECUTION

4.1. Cp ng trc

Coaxial cable

Tng qut GeneralLp t trong ng in hoc ng dn vi h tng xng vi s lng cp. Ph hp vi cc yu cu v bn knh gp khc ti thiu cho kch c cp. Cung cp cc h thng thch hp theo sau:Install in conduit or ducting with adequate clearance for the number of cables. Comply with minimum bending radius requirements for the size of cable. Provide the following systems, as appropriate: t trong sn b-tng c: Cp i trong ng PVC.Cast concrete slabs: Cable in PVC conduit. t trong phng my: Cp i trong ng PVC chu ti nng Plant rooms: Cable in heavy duty PVC conduit. B mt t va: Cp i trong ng PVC.Plastered or rendered surfaces: Cable in PVC conduit. Lm nhn xc nh cp ng trc: Nhn dng phng php c duyt v c nh.Coaxial cable identity labels: Label using an approved & permanent method. Cc u ni ng trc Coaxial connectors Loi: Ph hp vi c tnh cu trc ca loi v bc qui nh.Type: Suitable for the type of shield structure specified. Cht lm kn: Sealant: Cc cm OutletsTt c cc cm c bc chng nhiu. Fully screen all outlets. ng cng Rigid conduitsCung cp ng in chy di thng, u v khng b thng, c g hay sc cnh. Khng dng ng c cc gp khc, co. Provide straight long runs, smooth and free from rags, burrs and sharp edges. Do not use conduit elbows. Trng km GalvanizingCung cp ng trng km, kp, gi nhng v tr m thp. Provide galvanized conduit support clips for damp locations. Trng by Set outNu l ra ch nhn thy c, lp t ng in chy song song v phi tht vung gc khi i hng.If exposed to view, install conduits in parallel runs with right angle changes of direction. Dy ko mi Draw cords Tng qut: Cung cp dy ko mi trong ng in d tr. d 1 mt dy cun trn li u cui ca ng in.General: Provide draw cords in conduits not in use. Leave 1 m of cord coiled at each end of the run. Vt t: Dy Polypropylene hoc dy tip t nhiu tao c bc cch in tit din ti thiu l 2.5 mm2.Material: Polypropylene cord, or insulated stranded earth wire, 2.5 mm2 minimum size. Cc hp ko dy Draw-in boxes Tng qut: Cung cp hp ko dy khong cch khng qu 30m cho nhng ng in chy thng v nhng ch thay i cao hoc nh hng.General: Provide draw-in boxes at intervals not exceeding 30 m in straight runs, and at changes of level or direction. Hp ko dy chn ngm: s dng loi np c m kn v lm kn hp chng hi nc.Underground draw-in boxes: Provide gasketted covers and seal against moisture. ng in t m Concealed routes ng c m trong rnh tng, c vo trong tm sn hoc c lp t nhng v tr khng th n gn c: Chy trc tip gia cc im ni, gim thiu s ng in v im ni. Khng lp t cc ph kin phc v cng tc kim tra. Conduits concealed in wall chases, embedded in floor slabs or installed in inaccessible locations: Run directly between points of termination, minimising the number of sets. Do not provide inspection fittings. Cp c lp t bn trong mi hoc di sn g: Lp t cp chc chn vi kp, gi trnh cp b bc ln hay ri xung.Cabling installed within roofs or under timber flooring: Secure with cable clips to support beams to prevent cables being stepped upon or coming loose. ng in trong sn b-tng Conduits in concrete slabs Tuyn ng in: Khng c chy ng in trn lp mt b-tng. Khng chy trong nhng vng cng cp kt cu, ct ngang vung gc nhng vng cng cp kt cu. Chy cc tuyn dy cp trnh cho nhau v gim ti thiu s lng ng in bt k v tr no. ng t song song cch nhau ti thiu l 50 mm mi bn. Route: Do not run in concrete toppings. Do not run within pretensioning cable zones; cross pretensioning cable zones at right angles. Route to avoid crossovers and minimise the number of conduits in The English language version prevails. any location. Space parallel conduits at least 50 mm apart. Chiu su chn ti thiu: bng ng knh ng in hoc 20 mm.Minimum cover: Conduit diameter or 20 mm. Kch thc ng in: ng knh ti a l 25 mm. Trnh h xi-mng ri vo.

S lp cht: Gn trc tip trn b mt ca y lp gia c ni m cc ng in i qua pha trn ca lp gia c.Conduit size: 25 mm maximum diameter. Prevent ingress of slurry. Fixing: Fix directly to top of the bottom layer of reinforcing where the conduits pass above a single layer of reinforcing. Nhng tm sn cm t ng in. Khng chy ng in trong mt sn ca phng ni hi, phng my v b cha.Do not install cable directly into any solid structure. Do not run conduits in the floor slabs of boiler rooms, plant rooms and tank rooms.

5. TH NGHIM, CHY TH V NGHIM THU

TESTING AND COMMISSIONING

5.1. Tng quan

General

Ci t: tr gip ci t, s dng cc tn hiu th nghim pht ti ch (trn cng cc tn s) cung cp cc iu kin tnh o mc tn hiu. Bao gm kt qu c lit k trn bng cho tt c hoc cc im then cht ca h thng trong cc d liu th nghim trnh cho vic th cc tn hiu. Setup: To aid in setup, use locally generated test signals (on the same frequencies) to provide static conditions for level measurements. Include tabulated results for all or key system points in submitted testing data for test signals. Thc hin h thng: Tip theo khi hon tt cc iu chnh ci t h thng, dng cc im then cht thm tra cc gi tr ci t ph hp vi thit k, o v ghi li ton b h thng. System performance: Following completion of system setup adjustments, utilising key system points to verify settings in accordance with the design, measure and record over the whole system. Signal gain level: required o t s sng mang - nhiu v li tn hiu: yu cu c.Carrier-to-noise measurements: required B iu khin trung tm Headendo v ghi li cc tn hiu b iu khin trung tm theo sau: Measure and record the following signals at the headend: Tn hiu off air cc knh thu nhn Off air as received channels. Cc b chuyn i knh ng vo v cc b khuch i knh tn hiu Input to channel converters and channelled amplifiers.

Cc b chuyn i knh ng ra c phn thnh nhm cui cng v cc b khuch i knh tn hiu. Final grouped output of channel converters and channelised amplifiers. Cc b iu ch ng ra c phn theo nhm cui cng.Final grouped output of modulators. Cc b khuch i ng vo v ra cho tt c cc knh (ng vo l ng vo chnh khng phi l ng vo th nghim) Input and output of amplifiers for all channels (output is main output not test output). Ng vo v ra ca cc b lc cho tt c cc knh hp qui cch.Input and output of filters for channels passed. Cc giao im chnh th ng ring bit hoc cc mng li kt ni cho knh c mc thp nht hoc cao nht. Main nodes of passive separating or combining networks for channel of lowest level and of highest level. Tn hiu ng ra sau cng ca b iu khin trung tm cho tt c cc knh. Final output of the headend for all channels o v ghi li t s sng mang - nhiu v li tn hiu theo sau: Measure and record the following signal gain level and carrier to noise ratios: Tn hiu off air cc knh thu nhn Off air as received channels. Cc b chuyn i knh ng vo v cc b khuch i knh tn hiu.Input to channel converters and channelled amplifiers. Cc b chuyn i knh ng ra c phn thnh nhm cui cng v cc b khuch i knh tn hiu. Final grouped output of channel converters and channelled amplifiers. Cc b iu ch ng ra c phn theo nhm cui cng. Final grouped output of modulators. Cc b khuch i ng vo v ra cho tt c cc knh.Input and output of amplifiers for all channels. Tn hiu ng ra sau cng ca b iu khin trung tm cho tt c cc knh.Final output of the headend for all channels. o v ghi li Measure and record: Cc mc khuch i tn hiu ng vo v ra cho tt c cc knh (ng vo l ng vo chnh khng phi l ng vo th nghim) Input and output amplifier signal levels for all channels (output is main output not the test output). T l sng mang - nhiu v li tn hiu cho tt c cc knh. Input and output system gain level and carrier to noise ratios of all channels.

Chy th v nghim thu: Commissioning: iu chnh li c gi tr cao nht -6 dB Adjust to -6 dB of maximum available gain. Hot ng -6 dB c lin quan n mc tn hiu ng ra cao nht c cng b./Operate at -6 dB relative to the published maximum output level. Gim cng sut danh nh tnh ton cc b khuch i lin quan n s lng knh thu c vi hn nh cho php m rng trong tng lai.Derate amplifiers relative to the number of channels to be carried with allowance for future expansion. ng dng s gim cng sut danh nh tnh ton cho cc b khuch i th hai v tip theo sau ni m cc b khuch i xp theo tng.Apply derating for second and subsequent amplifiers, where amplifiers are to be cascaded. Cc cu kin thnh phn phn phi Distribution components cc b chia, b mc r, o v ghi li tn hiu ng vo, cc ng ra v tt c cc cng mc r tn s tn hiu cao nht v thp nht. At splitters and taps, measure and record the input, outputs and all tap ports at minimum and maximum signal frequencies. Cc cm Outlets mi cm:At each outlet: o v ghi li Measure and record Cc mc tn hiu ca tt c cc knh All channel signal levels T s sng mang - nhiu ca tt c cc knh System gain level of all channels. nh gi ch quan cht lng hnh nh v m thanh trn nm cp suy yu.Evaluate subjective picture and sound quality on five-grade impairment scale.6. HON TT

COMPLETION

Tng qut General Khi hon tt lp t h thng, th nghim, chy th v nghim thu cung cp tt c cc thng tin tr gip trong vic nhn bit cc cu kin thnh phn v v tr ca chng. V phn nhn bit cp, s dng cc t nh s dng lp t cc nhn. Cung cp cc thng tin dng bng lit k ph hp c tham chiu n cu kin v v tr c xc nh r trong h thng. On completion of system installation, testing and commissioning provide all information to aid in the identification of components and their location. For cable identification, use the same wording as used on installed labels. Provide information in a suitably tabulated form with reference to the component and position in the system clearly indicated. Cc bn v thi cng As installed drawingsCung cp cc bn v trnh by lp t h thng. Trnh by tt c cc thng tin c lin quan cng nh tn s (knh)tn hiu cao nht v thp nht v cc mc ca chng ng ra v ng vo ca cc b khuch i, cc b chia, cc mch r, cc im mch r v cc cm. Provide drawings showing the system as installed. Show all relevant information such as minimum and maximum signal frequency (channel) and their levels at the input and output of amplifiers, splitters, taps, tap ports and outlets.7. KIM TRA V XC NHN KT QU CHY TH V NGHIM THU

COMMISSIONING VERIFICATION

Tng qut General Phi trnh cc bn v hon cng h thng v bng lit k cc kt qu th nghim, thc hin vic thm tra thc thi ca h thng theo c tnh k thut ny v thit k c trnh duyt. Following submission of as installed system drawings and tabulated test results, carry out verification of system performance with this specification and the approved design. S thm tra VerificationTiu chun: Gi tr thay i cho php cao nht l 1 dB t cc gi tr c ghi li trong thi gian chy th v nghim thu. iu ny khng ng dng cho vic thu nhn cc knh t mt t FTA ni m AGC khng c s dng, nhng n c ng dng cho vic th cc tn hiu thay th nh l mt phn th tc th nghim.

Standard: The maximum allowed variation is 1 dB from the values recorded during commissioning. This does not apply to terrestrial received FTA channels where AGC is not used, but it does apply for test signals substituted as part of the test procedure.

Cc phng php:Methods: b iu khin trung tm v cc thit b hot ng - mt s lp li th nghim chy th v nghim thu.At headend and active equipment - a repeat of commissioning tests. Cho cc b chia v cc mch r thi im bt u v kt thc ca tt c cc ng dy, nhnh v ng cp - mt s lp li th nghim chy th v nghim thu.For splitters and taps at the start and end of all trunk, branch and spur cables -a repeat of commissioning tests. Tng cc mch r s th nghim l 25% ca tt c c mch r. Nu khng, phi th nghim cc mch r vt tri ngu nhin c chn la.The total of taps so tested will be 25% of all taps. If less, then extra taps randomly selected are to be included. 25% ca tt c cc cm - mt s lp li th nghim chy th v nghim thu.At 25% of all outlets - a repeat of commissioning tests.

Project: La Casa - Part 1: Electrical system SpecificationPage: 23 / 23