173
ITED
sistema de receção S/MATV Paulo Monteiro
A designação genérica de S/MATV é o termo utilizado na caraterização de um sistema coaxial, que tanto pode ser de MATV como de S/MATV. 2 VLVWHPD GH 0$79 GLVWULEXL VLQDLV GR WLSR $ YLD KHUW]LDQD WHUUHVWUH 2 VLVWHPD GH 6 0$79 GLVWULEXL VLQDLV GR WLSR % YLD VDW«OLWH 2 VLVWHPD GH UHFH©¥R GH 6 0$79 « FRQV WLWX¯GR SHODV DQWHQDV UHFH©¥R SHOR '67 SURWH©¥R SHOD &5 WUDWDPHQWR H GLVSRVLWL YRV GH GHULYD©¥R H UHSDUWL©¥R GLVWULEXL©¥R 3DUD R GLPHQVLRQDPHQWR GRV HOHPHQWRV GH UHFH©¥R WUDWDPHQWR H GLVWULEXL©¥R R SURMHWLVWD GHYH FRQVLGHUDU DV FDUDWHU¯VWLFDV W«FQLFDV GH ͤQLGDV QR FDS¯WXOR GRV GLVSRVLWLYRV H PDWHULDLV $VSHWRV D FRQVLGHUDU SDUD R GLPHQVLRQD PHQWR GR VLVWHPD GH UHFH©¥R 6 0$79 • /RFDOL]D©¥R GR HGLI¯FLR 7'7 ]RQD GH UH FH©¥R GR WLSR $ RX % • 7LSR GH DQWHQD H UHVSHWLYDV FDUDWHU¯VWLFDV W«FQLFDV • $V FDUDWHU¯VWLFDV GRV HOHPHQWRV FRQVWL WXLQWHV GD &5 ͤOWURV SU« DPSOLͤFDGRU DPSOLͤFDGRU GHULYDGRUHV H UHSDUWLGRUHV 5HFRPHQGD VH IRUWHPHQWH TXH DV LQVWDOD ©·HV SRVVXDP EOLQGDJHP ¢V UHGHV GH FRPX QLFD©·HV PµYHLV FRPR SRU H[HPSOR R /7( DWUDY«V GH ͤOWUDJHQV LQWHJUDGDV QDV DQWHQDV RX QRV VLVWHPDV GH DPSOLͤFD©¥R RX DWUDY«V GD LQVWDOD©¥R GH XP ͤOWUR 5) GH DFRUGR FRP DV HVSHFLͤFLGDGHV GR ORFDO &RQVLGHUD©·HV D WHU HP FRQWD QR SURMHWR GR VLVWHPD GH UHFH©¥R 6 0$79 • 2 GHVFDUUHJDGRU GH VREUHWHQV¥R '67 « REULJDWµULR H GHYH VHU LQVWDODGR R PDLV SUµ[LPR SRVV¯YHO GD DQWHQD SUHIHUHQFLDO PHQWH DQWHV GH TXDOTXHU RXWUR GLVSRVLWLYR • 2 ͤOWUR 5) TXDQGR H[LVWD GHYH VHU LQVWD ODGR R PDLV SUµ[LPR SRVV¯YHO GD DQWHQD DSµV R '67 • 2 SU« DPSOLͤFDGRU DPSOLͤFDGRU GH PDVWUR /1$ /RZ 1RLVH $PSOLͤHU TXDQGR QH FHVV£ULR GHYH VHU LQVWDODGR R PDLV SUµ[LPR SRVV¯YHO GD DQWHQD DSµV R ͤOWUR 5) FDVR D DQWHQD M£ Q¥R LQWHJUH HVWH GLVSRVLWLYR • 2V HTXLSDPHQWRV DWLYRV GHVWLQDGRV DR WUDWDPHQWR GR VLQDO RQGH VH LQFOXL R DP SOLͤFDGRU EHP FRPR RV GLVSRVLWLYRV GH UHSDUWL©¥R GHYHP VHU LQVWDODGRV QR $7( 1R FDVR GH VH WUDWDU GH XPD GLVWULEXL©¥R GH DFRUGR FRP RV 6&, VLVWHPDV FRD[LDLV inde www.oelectricista.pt o electricista 60
SHQGHQWHV RV HTXLSDPHQWRV DWLYRV GHYHP VHU LQVWDODGRV QR $7( VXSHULRU 1HVWD VLWXD©¥R RV GLVSRVLWLYRV GH UHSDUWL©¥R SRGHP VHU LQVWDODGRV QR $7( VXSHULRU RX DR ORQJR GDV FDL[DV GD FROXQD PRQWDQWH HP IXQ©¥R GD WRSRORJLD DGRWDGD
REDE DE CATV $ UHGH FROHWLYD GH &$79 LQLFLD VH QR 5* && H VHJXH REULJDWRULDPHQWH D WRSRORJLD GH GLVWULEXL ©¥R HP HVWUHOD GHVGH R VHFXQG£ULR GR 5* && ORFDOL]DGR QR $7( DW« DRV SULP£ULRV GRV 5& && ORFDOL]DGRV QRV $7, 'HVHQYROYLGD QRUPDOPHQWH D SDUWLU GR $7( LQIHULRU HVWD UHGH FDUDFWHUL]D VH SRU ID]HU cor UHVSRQGHU XP FDER FRD[LDO GHYLGDPHQWH LGHQWLͤFDGR D FDGD XP GRV IRJRV $ UHGH GH &$79 GHYH VHU GLPHQVLRQDGD SDUD RSHUDU QD YLD GLUHWD H QD YLD GH UHWRUQR FRQVL GHUDQGR RV OLPLWHV SUHYLVWRV QD QRUPD Euro DOCSIS, RX VHMD • $ YLD GLUHWD GHYH RSHUDU HQWUH 0+] H 0+] • $ YLD GH UHWRUQR GHYH RSHUDU HQWUH 0+] H 0+] 6¥R FDOFXODGDV SRU IRJR DV DWHQXD©·HV H RV YDORUHV GH ̸Tilt̹ SDUD DV OLJD©·HV HQWUH R VHFXQG£ ULR GH 5* && H DV UHVSHWLYDV 77 2V F£OFXORV HIHWXDGRV GHYHP VHU LQFOX¯GRV QR SURMHWR (P FDVR GH QHFHVVLGDGH QRPHDGDPHQWH SDUD OLJD©·HV FRP FRPSULPHQWR VXSHULRU DR FRPSULPHQWR P£[LPR GR FDQDO R VLVWHPD GH &$79 GHYH SRVVXLU HTXLSDPHQWR DWLYR GH DPSOLͤ FD©¥R FRPSDW¯YHO FRP DV EDQGDV GH IUHTX¬QFLDV UHIHULGDV DQWHULRUPHQWH
REDES INDIVIDUAIS DE CABOS COAXIAIS $ UHGH LQGLYLGXDO GH FDERV FRD[LDLV GHVHQYROYH VH HQWUH R VHFXQG£ULR GR 5& && H DV 77 $ GLVWULEXL©¥R D SDUWLU GR VHFXQG£ULR GR 5& && VHJXH REULJDWRULDPHQWH XPD WRSRORJLD HP HVWUHOD 3DUD FRPSULPHQWRV GH FDERV VXSHULRUHV D P « QHFHVV£ULD D FULD©¥R GH SRQWRV GH GLVWUL EXL©¥R LQWHUP«GLRV DWLYRV GH PRGR D JDUDQWLU D FODVVH GH OLJD©¥R 7&' & + 2XWUD VROX©¥R VHU£ D ORFDOL]D©¥R DGHTXDGD GR 5& && GH IRUPD D PLQLPL]DU DV GLVW¤QFLDV ¢V 77 2 SURMHWLVWD GHYH FRQVLGHUDU DV FDUDWHU¯VWLFDV W«FQLFDV GHͤQLGDV QR FDS¯WXOR GRV PDWHULDLV na HVFROKD GR FDER H GR 5& &&
DIMENSIONAMENTO DAS REDES DE CABOS COAXIAIS DE CATV E DE S/MATV 1RV HGLI¯FLRV FRP SDUWHV FROHWLYDV H LQGLYLGXDLV GHYHP VHU FRQVLGHUDGDV GXDV OLJD©·HV GLVWLQ WDV XPD FRUUHVSRQGHQWH ¢ UHGH FROHWLYD GH FDERV FRD[LDLV HQWUH R VHFXQG£ULR GR 5* && RX GD &5 H RV SULP£ULRV GRV 5& && H RXWUD HQWUH R VHFXQG£ULR GR 5& && H DV 77 (P FDGD XPD GDV OLJD©·HV Q¥R GHYH VHU H[FHGLGD R FRPSULPHQWR P£[LPR GDV UHVSHWLYDV OLJD©·HV SHUPDQHQWHV RX VHMD P REWLGR FRP EDVH QR FRPSULPHQWR P£[LPR GR FDQDO para D FODVVH GH OLJD©¥R 7&' & + RX VHMD P WDO FRPR SUHYLVWR QD V«ULH (1 $V OLJD©·HV SHUPDQHQWHV LQFOXHP WRGRV RV HOHPHQWRV SDVVLYRV TXH V¥R SDUWH LQWHJUDQWH GD OLJD©¥R RX VHMD FDERV FRQHWRUHV GLVSRVLWLYRV GH GHULYD©¥R UHSDUWL©¥R H 77 (P WHUPRV GH GLPHQVLRQDPHQWR GHYHP VHU FRQVLGHUDGRV WU¬V FHQ£ULRV GLVWLQWRV • (GLI¯FLR FRP SDUWH FROHWLYD H LQGLYLGXDO FRP 6&8 • (GLI¯FLR FRP SDUWH FROHWLYD H LQGLYLGXDO FRP 6&, • (GLI¯FLR VHP SDUWH FROHWLYD
Figura 1. Elementos constituintes de uma rede S/MATV e CATV com SCU.