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Promax

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TELE-satellite ara
TELE-satellite ara
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‫‪TEST REPORT‬‬ ‫ﺟﻬﺎﺯ ﺗﺿﻣﻳﻥ ﺑﺙ ﺍﻟﻔﻳﺩﻳﻭ ﺍﻟﺭﻗﻣﻰ ﺍﻻﺭﺿﻰ ﻋﺑﺭ ﺍﻟﻛﺎﺑﻼﺕ‬ ‫0102/10-21‬ ‫‪Promax‬‬ ‫‪PROMAX DIGITAL TO TV‬‬ ‫‪The perfect solution to distribute digital‬‬ ‫‪signals to a cable network in absolute‬‬ ‫.‪error-free quality‬‬ ‫‪Digital To TV headend‬‬ ‫ﻫﻝ ﺗﺭﻳﺩ ﺑﺙ ﺗﻠﻳﻔﺯﻳﻭﻧﻰ ﺭﻗﻣﻰ ﻋﺑﺭ ﺍﻟﻛﺎﺑﻼﺕ؟‬ ‫ﻫﺫﺍ ﺃﻣﺭ ﺳﻬﻝ!‬ ‫ﻛﻣﺎ ﻫﻭ ﻣﻌﺭﻭﻑ ﻓﺎﻥ ‪ DVB-S‬ﻫﻰ ﺍﻟﻣﻭﺍﺻﻔﺎﺕ ﺍﻟﻘﻳﺎﺳﻳﺔ ﻟﻠﺑﺙ ﺍﻟﺗﻠﻳﻔﺯﻳﻭﻧﻰ ﺍﻟﺭﻗﻣﻰ ﻋﺑﺭ ﺍﻻﻗﻣﺎﺭ ﺍﻟﺻﻧﺎﻋﻳﺔ . ﻭ ﻛﺫﻟﻙ‬ ‫‪ DVB-T‬ﻫﻰ ﺍﻟﻣﻭﺍﺻﻔﺎﺕ ﺍﻟﻘﻳﺎﺳﻳﺔ ﻟﻠﺑﺙ ﺍﻟﺗﻠﻔﺯﻳﻭﻧﻰ ﺍﻻﺭﺿﻰ. ﻭ ‪ DVB-C‬ﻫﻰ ﺍﻟﻣﻭﺍﺻﻔﺎﺕ ﺍﻟﻘﻳﺎﺳﻳﺔ ﻟﻠﺑﺙ ﺍﻟﺗﻠﻔﺯﻳﻭﻧﻰ‬ ‫ﺍﻟﺭﻗﻣﻰ ﻋﺑﺭ ﺍﻟﻛﺎﺑﻼﺕ. ﻟﺫﻟﻙ ﺍﺫﺍ ﺍﺭﺩﺕ ﻋﻣﻝ ﺷﺑﻛﺔ ﺗﻠﻳﻔﺯﻳﻭﻧﻳﺔ ﻟﺗﺯﻭﻳﺩ ﻋﺩﺩ ﻣﺎ ﻣﻥ ﺍﻟﻣﺳﺗﺧﺩﻣﻳﻥ ﺑﺎﻟﺑﺙ ﺍﻟﺭﻗﻣﻰ ﺍﻟﺗﻠﻳﻔﺯﻳﻭﻧﻰ‬ ‫ﻓﺳﺗﺣﺗﺎﺝ ﺃﻥ ﺗﺯﻭﺩﻫﻡ ﺟﻣﻳﻌﺎ ﺑﺄﺟﻬﺯﺓ ﺍﺳﺗﻘﺑﺎﻝ ﺧﺎﺻﺔ ﺑﺎﻟﺑﺙ ﺍﻟﺗﻠﻳﻔﺯﻳﻭﻧﻰ ﺍﻟﺭﻗﻣﻰ ﻋﺑﺭ ﺍﻟﻛﺎﺑﻼﺕ ﻭﺍﻟﺗﻰ ﺗﺩﻋﻡ ﺍﻟﻣﻭﺍﺻﻔﺎﺕ‬ ‫ﺍﻟﻘﻳﺎﺳﻳﺔ ‪ .DVB-C‬ﺑﺎﻻﺿﺎﻓﺔ ﺍﻟﻰ ﺫﻟﻙ ﻓﺎﻧﻙ ﺑﺣﺎﺟﺔ ﺍﻟﻰ ﻧﻅﺎﻡ ﺍﺳﺗﻘﺑﺎﻝ ‪ headend‬ﻟﻠﺑﺙ ﺍﻟﺗﻠﻳﻔﺯﻳﻭﻧﻰ ﺍﻟﺭﻗﻣﻰ. ﻭﻟﻛﻥ ﻫﻝ‬ ‫ﻫﺫﻩ ﻫﻰ ﺍﻟﻁﺭﻳﻘﺔ ﺍﻻﻭﻓﺭ ﻟﻠﻘﻳﺎﻡ ﺑﺫﻟﻙ؟ ﻳﻘﻭﻝ ﺍﻟﺧﺑﺭﺍء ﻟﺩﻯ ﺷﺭﻛﺔ ‪ :Promax‬ﻻ ﻓﺑﺎﻣﻛﺎﻧﻙ ﺍﻥ ﻗﻭﻡ ﺑﺫﻟﻙ ﺑﻁﺭﻗﺔﺍﻭﻓﺭ ﻭﺃﺳﻬﻝ.‬ ‫‪36 TELE-satellite — Global Digital TV Magazine — 12-01/2010 — www.TELE-satellite.com‬‬
‫ﻟﻘﺩ ﻛﺎﻥ ﺍﻟﺭﺟﺎﻝ ﺍﻟﻌﺎﻣﻠﻭﻥ ﺑﺷﺭﻛﺔ‬ ‫ ﺃﺫﻛﻳﺎء ﺣﻳﺙ ﻻﺣﻅﻭﺍ ﺃﻥ‬Promax ‫ﺃﺟﻬﺯﺓ ﺍﻟﺗﻠﻔﺎﺯ ﺍﻟﺣﺩﻳﺛﺔ ﻓﻰ ﺃﺣﻳﺎﻥ ﻛﺛﻳﺭﺓ‬ ‫ ﻻﺳﺗﻘﺑﺎﻝ‬tuner ‫ﻳﺗﻡ ﺗﺯﻭﻳﺩﻫﺎ ﺑﻣﻭﺍﻟﻑ‬ ‫ﺍﻟﺑﺙ ﺍﻟﺗﻠﻔﺯﻳﻭﻧﻰ ﺍﻟﺭﻗﻣﻰ ﺍﻻﺭﺿﻰ‬ analoge ‫ﺑﺟﻭﺍﺭ ﺍﻟﻣﻭﺍﻟﻑ ﺍﻟﺗﻧﺎﻅﺭﻯ‬ ‫ﺍﻟﺗﻘﻠﻳﺩﻯ. ﻭ ﺍﻻﻥ، ﺍﺫﺍ ﻛﺎﻥ ﻣﻥ ﺍﻟﻣﻣﻛﻥ‬ ‫ﺍﺭﺳﺎﻝ ﺍﺷﺎ ﺭﺍﺕ ﺍﻟﺑﺙ ﺍﻟﺗﻠﻔﺯﻳﻭﻧﻰ ﺍﻟﺭﻗﻣﻰ‬ ‫ﺍﻻﺭﺿﻰ ﻋﺑﺭ ﺍﻟﻬﻭﺍء، ﻓﺎﻧﻪ ﻣﻥ ﺍﻟﻣﻣﻛﻥ‬ .‫ﺍﺭﺳﺎﻟﻬﺎ ﻋﺑﺭ ﺷﺑﻛﺔ ﺍﻟﻛﺎﺑﻼﺕ ﺍﻳﺿﺎ‬ ‫ﻓﺟﻬﺎﺯ ﺍﻟﺗﻠﻔﺎﺯ ﻟﺩﻯ ﺍﻟﻣﺳﺗﺧﺩﻡ ﻻ ﻳﺑﺎﻟﻰ‬ ‫ﺍﺫﺍ ﻣﺎ ﻛﺎﻧﺕ ﺍﺷﺎﺭﺓ ﺍﻟﺑﺙ ﺍﻟﺗﻠﻔﺯﻳﻭﻧﻰ‬ ‫ﺍﻟﺭﻗﻣﻰ ﺍﻻﺭﺿﻰ ﻗﺎﺩﻣﺔ ﻣﻥ ﺍﻟﻬﻭﺍﺋﻰ‬ .‫ ﺃﻡ ﻣﻥ ﻧﻅﺎﻡ ﻛﺎﺑﻼﺕ‬aerial ‫ﺇﻥ ﺑﻌﺽ ﺍﻟﻣﺷﺎﻫﺩﻳﻥ ﺳﻳﻛﻭﻥ‬ ‫ﻟﺩﻳﻬﻡ ﻣﻭﺍﻟﻑ ﺑﺙ ﺗﻠﻔﺯﻳﻭﻧﻰ ﺭﻗﻣﻰ‬ ‫ ﺑﺩﺍﺧﻝ‬DVB-T tuner ‫ﺃﺭﺿﻰ‬ ‫ﺃﺟﻬﺯﺓﺍﻟﺗﻠﻔﺯﻳﻭﻥ ﺍﻟﻣﺳﻁﺣﺔ ﺍﻟﺗﻰ‬ ‫ﻟﺩﻳﻬﻡ، ﻭ ﺍﻟﺑﻌﺽ ﺍﻻﺧﺭ ﺳﻳﺳﺗﺧﺩﻡ‬ set-top-box ‫ﺟﻬﺎﺯ ﺍﺳﺗﻘﺑﺎﻝ‬ TELE-satellite World www.TELE-satellite.com/... Download this report in other languages from the Internet: Arabic ‫ﺍﻟﻌﺮﺑﻴﺔ‬ www.TELE-satellite.com/TELE-satellite-1001/ara/promax.pdf Indonesian Indonesia www.TELE-satellite.com/TELE-satellite-1001/bid/promax.pdf Bulgarian Български www.TELE-satellite.com/TELE-satellite-1001/bul/promax.pdf Czech Česky www.TELE-satellite.com/TELE-satellite-1001/ces/promax.pdf German Deutsch www.TELE-satellite.com/TELE-satellite-1001/deu/promax.pdf English English www.TELE-satellite.com/TELE-satellite-1001/eng/promax.pdf Spanish Español www.TELE-satellite.com/TELE-satellite-1001/esp/promax.pdf Farsi ‫ﻓﺎﺭﺳﻲ‬ www.TELE-satellite.com/TELE-satellite-1001/far/promax.pdf French Français www.TELE-satellite.com/TELE-satellite-1001/fra/promax.pdf Hebrew ‫עברית‬ www.TELE-satellite.com/TELE-satellite-1001/heb/promax.pdf Greek Ελληνικά www.TELE-satellite.com/TELE-satellite-1001/hel/promax.pdf Croatian Hrvatski www.TELE-satellite.com/TELE-satellite-1001/hrv/promax.pdf Italian Italiano www.TELE-satellite.com/TELE-satellite-1001/ita/promax.pdf Hungarian Magyar www.TELE-satellite.com/TELE-satellite-1001/mag/promax.pdf Mandarin 中文 www.TELE-satellite.com/TELE-satellite-1001/man/promax.pdf Dutch Nederlands www.TELE-satellite.com/TELE-satellite-1001/ned/promax.pdf Polish Polski www.TELE-satellite.com/TELE-satellite-1001/pol/promax.pdf Portuguese Português www.TELE-satellite.com/TELE-satellite-1001/por/promax.pdf Romanian Românesc www.TELE-satellite.com/TELE-satellite-1001/rom/promax.pdf Russian Русский www.TELE-satellite.com/TELE-satellite-1001/rus/promax.pdf Swedish Svenska www.TELE-satellite.com/TELE-satellite-1001/sve/promax.pdf Turkish Türkçe www.TELE-satellite.com/TELE-satellite-1001/tur/promax.pdf Available online starting from 27 November 2009 www.TELE-satellite.com — 12-01/2010 — TELE-satellite — Global Digital TV Magazine 37
‫ﺇﻥ ﻭﺣﺩﺓ 201-‪ DT‬ﻫﻰ ﺍﻟﻭﺣﺩﺓ‬ ‫ﺍﻟﻭﺣﺩﺓ ﺍﻟﺗﺎﻟﻳﺔ ﺍﻟﻣﻭﺟﻭﺩﺓ ﻟﺩﻳﻧﺎ ﻓﻰ‬ ‫ﺑﺗﺻﻣﻳﻡ ﻧﻅﺎﻡ ﺍﻻﺳﺗﻘﺑﺎﻝ ‪DTTV‬‬ ‫ﻣﻧﻔﺻﻝ ﻻﺳﺗﻘﺑﺎﻝ ﺍﻟﺑﺙ ﺍﻟﺗﻠﻔﺯﻳﻭﻧﻰ‬ ‫ﺍﻟﺗﺎﻟﻳﺔ ﺍﻟﺗﻰ ﻭﺿﻌﻧﺎﻫﺎ ﺑﺟﻭﺍﺭ ﻭﺣﺩﺓ‬ ‫ﺭﻑ ‪ rack‬ﺍﻻﺧﺗﺑﺎﺭ ﻫﻰ 203-‪.DT‬‬ ‫‪.headend‬‬ ‫ﺍﻟﺭﻗﻣﻰ. ﻭ ﻟﻛﻥ ﻳﺑﻘﻰ ﻫﻧﺎﻙ ﺷﺊ ﻭﺍﺣﺩ‬ ‫203-‪ .DT‬ﻓﻭﺣﺩﺓ 201-‪ DT‬ﺗﻘﻭﻡ‬ ‫ﻭ ﻫﻰ ﻭﺣﺩﺓ ﺗﺣﺗﻭﻯ ﻋﻠﻰ ﺟﻬﺎﺯﻯ‬ ‫ﻣﺅﻛﺩ: ﻓﺎﺫﺍ ﻛﺎﻥ ﺑﺎﺳﺗﻁﺎﻋﺗﻬﻡ ﺍﺳﺗﻘﺑﺎﻝ‬ ‫ﺑﺗﺣﻭﻳﻝ ﺍﺷﺎ ﺭﺍﺕ ﺍﻟﺑﺙ ﺍﻟﺭﻗﻣﻰ ﻣﻥ‬ ‫ﺍﺳﺗﻘﺑﺎﻝ ﻓﻰ ﺍﻥ ﻭﺍﺣﺩ ﻟﻛﻰ ﺗﺩﻋﻡ‬ ‫ﻭﺻﻑ ﺃﺟﺯﺍء ﺍﻟﺟﻬﺎﺯ‬ ‫ﺍﺷﺎﺭﺓ ﺍﻟﺑﺙ ﺍﻟﺗﻠﻔﺯﻳﻭﻧﻰ ﺍﻟﺭﻗﻣﻰ‬ ‫ﺍﻟﻧﻭﻉ ‪ transport stream‬ﺍﻟﻰ‬ ‫ﻧﻅﺎﻣﻰ ﺍﻟﺑﺙ ﺍﻟﺗﻠﻔﺯﻳﻭﻧﻰ ﺍﻟﺭﻗﻣﻰ ﻋﺑﺭ‬ ‫ﺍﻻﺭﺿﻰ ﻻﺳﻠﻛﻳﺎ ﻓﺳﻳﻛﻭﻥ ﺑﺎﻣﻛﺎﻧﻬﻡ‬ ‫ﺍﺷﺎ ﺭﺍﺕ ﺑﺙ ﺗﻠﻔﺯﻳﻭﻧﻰ ﺭﻗﻣﻰ ﺍﺭﺿﻰ‬ ‫ﺍﻻﻗﻣﺎﺭ ﺍﻟﺻﻧﺎﻋﻳﺔ 2‪ DVBS/S‬ﻭ‬ ‫ﺇﻥ ﻧﻅﺎﻡ ﺍﻻﺳﺗﻘﺑﺎﻝ ﻗﺩ ﺗﻡ ﺗﺻﻣﻳﻣﻪ‬ ‫ﺍﻳﺿﺎ ﺍﺳﺗﻘﺑﺎﻝ ﺍﻟﺑﺙ ﺍﻟﺗﻠﻔﺯﻳﻭﻧﻰ‬ ‫‪ .DVB-T‬ﻭﺗﻘﺑﻝ ﺃﻯ ﻧﻭﻉ ﻣﻥ ﺍﺷﺎ ﺭﺍﺕ‬ ‫ﻫﺫﻩ ﺍﻟﻭﺣﺩﺓ ﺗﻘﻭﻡ ﺑﺎﺧ ﺭﺍﺝ ﺍﺷﺎ ﺭﺍﺕ ﻣﻥ‬ ‫ﻋﻠﻰ ﻫﻳﺋﺔ ﻭﺣﺩﺍﺕ ﻟﺫﻟﻙ ﻣﻥ ﺍﻟﺳﻬﻝ‬ ‫ﺍﻟﺭﻗﻣﻰ ﻋﺑﺭ ﺍﻟﻛﺎﺑﻼﺕ ﻭ ﻫﺫﺍ ﻓﻘﻁ ﺍﺫﺍ‬ ‫‪ transport stream‬ﻭ ﻟﻛﻥ ﻓﻰ‬ ‫ﺍﻟﻧﻭﻉ ‪ Transport stream‬ﻭﻫﻭ‬ ‫ﺿﺑﻁﻪ ﺗﺑﻌﺎ ﻟﻼﺣﺗﻳﺎﺟﺎﺕ ﺍﻟﻣﺣﺩﺩﺓ.‬ ‫ﻛﺎﻥ ﻧﻅﺎﻡ ﺍﺳﺗﻘﺑﺎﻝ ﺍﻟﻛﺎﺑﻼﺕ ‪cable‬‬ ‫ﺍﺧﺗﺑﺎﺭﻧﺎ ﻫﺫﺍ ﺍﺳﺗﺧﺩﻣﻧﺎ ﺍﻻﺷﺎ ﺭﺍﺕ‬ ‫ﺍﺣﺩ ﺑﺭﻭﺗﻭﻛﻭﻻﺕ ﺍﻟﺑﺙ ﺍﻟﺭﻗﻣﻰ. ﻓﺎﺫﺍ‬ ‫ﻓﻛﻝ ﺷﺊ ﺗﻡ ﻭﺿﻌﻪ ﻓﻰ ﺭﻑ ‪rack‬‬ ‫‪ headend‬ﻳﻘﻭﻡ ﺑﺎﺧ ﺭﺍﺝ ﺍﺷﺎﺭﺓ‬ ‫ﺍﻟﺗﻰ ﻳﻘﻭﻡ ﺑﺎﺧ ﺭﺍﺟﻬﺎ ﺍﻟﻭﺣﺩﺓ ﺍﻟﻣﺟﺎﻭﺭﺓ‬ ‫ﻗﻣﺕ ﺑﺗﻭﺻﻳﻝ ﻭﺣﺩﺗﻰ ‪ LNB‬ﺑﻣﺩﺍﺧﻝ‬ ‫ﻣﺗﻭﺍﻓﻘﺔ ﻣﻊ ﺍﻟﺑﺙ ﺍﻟﺗﻠﻔﺯﻳﻭﻧﻰ ﺍﻟﺭﻗﻣﻰ‬ ‫ﻗﻳﺎﺳﻰ ﻁﻭﻟﻪ 91ﺑﻭﺻﺔ. ﻭﻭﺣﺩﺓ ﺍﻟﺗﺣﻛﻡ‬ ‫ﻟﻪ ﻭ ﻫﻰ ﻭﺣﺩﺓ 203-‪ .DT‬ﻭ ﻳﻭﺟﺩ‬ ‫ﺗﻠﻙ ﺍﻟﻭﺣﺩﺓ، ﻳﻣﻛﻧﻙ ﺍﻋﺩﺍﺩ ﺍﻟﻭﺣﺩﺓ ﺑﺎﻥ‬ ‫ﺍﻻﺭﺿﻰ. ﻭ ﻫﺫﺍ ﻫﻭ ﻣﺎ ﻳﻘﻭﻡ ﺑﻪ ﻧﻅﺎﻡ‬ ‫ﻭ ﻣﺯﻭﺩ ﺍﻟﻁﺎﻗﺔ 008-‪ DT‬ﺗﻡ ﻭﺿﻌﻬﻡ‬ ‫ﺑﻬﺫﻩ ﺍﻟﻭﺣﺩﺓ ﻣﺩﺧﻠﻳﻥ ‪ ASI‬ﻻﺷﺎ ﺭﺍﺕ‬ ‫ﺗﺳﺗﻘﺑﻝ ﻣﺳﺗﺟﻳﺑﻳﻥ ‪transponders‬‬ ‫ﺍﺳﺗﻘﺑﺎﻝ ‪ Promax‬ﻭﻫﻭ ‪Digital To‬‬ ‫ﻓﻰ ﺍﻗﻰ ﺍﻟﻳﺳﺎﺭ. ﻛﻣﺎ ﻳﻭﺟﺩ ﺑﻪ ﺷﺎﺷﺔ‬ ‫‪ transport stream‬ﻭ ﻣﺧﺭﺝ‬ ‫ﻣﺧﺗﻠﻔﻳﻥ. ﺇﻥ ﻛﻝ ﺟﻬﺎﺯ ﺍﺳﺗﻘﺑﺎﻝ‬ ‫‪ ! TV (DTTV) headend‬ﻭ ﻫﺫﺍ‬ ‫ﻋﺭﺽ ‪LCD‬ﺑﻳﺎﻧﻳﺔ ﻭ ﺑﻌﺽ ﺍﻻﺯﺭﺍﺭ‬ ‫ﻟﻼﺷﺎ ﺭﺍﺕ ﺍﻟﻣﺗﻭﺍﻓﻘﺔ ﻣﻊ ﻣﻭﺍﺻﻔﺎﺕ‬ ‫ﺃﻗﻣﺎﺭ ﺻﻧﺎﻋﻳﺔ ﻟﻪ ﻣﺧﺭﺟﻳﻥ‬ ‫ﺍﻟﻧﻅﺎﻡ ﻳﻌﻣﻝ ﺑﺩﻭﻥ ﺍﻟﺣﺎﺟﺔ ﺍﻟﻰ ﺟﻬﺎﺯ‬ ‫ﺍﻟﺑﺙ ﺍﻟﺗﻠﻔﺯﻳﻭﻧﻰ ﺍﻟﺭﻗﻣﻰ ﺍﻻﺭﺿﻰ‬ ‫‪ASI‬ﻣﺗﻣﺎﺛﻠﻳﻥ ﻣﻥ ﺍﻟﻧﻭﻉ ‪Transport‬‬ ‫ﺍﻟﺗﻰ ﺗﺳﺗﺧﺩﻣﻬﺎ ﻟﻠﺗﺣﻛﻡ ﺑﺎﻟﻭﺣﺩﺍﺕ‬ ‫ﺍﺳﺗﻘﺑﺎﻝ ﻟﺩﻯ ﻛﻝ ﻣﺳﺗﺧﺩﻡ.‬ ‫‪ .DVB-T‬ﻓﻬﻧﺎﻙ ﺍﺷﺎﺭﺗﻳﻥ ﺣﺎﻣﻠﺗﻳﻥ‬ ‫‪ .stream‬ﻭ ﺍﻻﺧﺗﺻﺎﺭ ‪ASI‬‬ ‫ﺍﻻﺧﺭﻯ. ﺑﺎﻻﺿﺎﻓﺔ ﺍﻟﻰ ﻫﺫﺍ، ﻳﻭﺟﺩ‬ ‫‪ ) carriers‬ﻭ ﺑﺎﻟﺗﺎﻟﻰ ﻫﻧﺎﻙ ﻣﺑﺎﺩﻟﻳﻥ‬ ‫ﻳﻌﻧﻰ ‪Asynchronous Serial‬‬ ‫ﻭﺻﻠﺔ ‪ Ethernet‬ﻋﻠﻰ ﺍﻟﻠﻭﺣﺔ‬ ‫ﻭ ﻟﺟﻌﻝ ﺷﺑﻛﺔ ﺍﻟﻛﺎﺑﻼﺕ ﺷﺑﻛﺔ‬ ‫‪ (multiplexes‬ﻓﻰ ﺍﻟﻣﺧﺭﺝ ﺍﺫﺍ ﻗﻣﻧﺎ‬ ‫‪ Interface‬ﺃﻭﺍﻟﻭﺍﺟﻬﺔ ﺍﻟﺗﺳﻠﺳﻠﻳﺔ‬ ‫ﺍﻻﻣﺎﻣﻳﺔ. ﻓﺑﻌﺩ ﺗﻭﺻﻳﻝ ﺍﻟﻭﺣﺩﺓ ﺑﺷﺑﻛﺔ‬ ‫ﺷﻳﻘﺔ، ﻓﺎﻧﺕ ﻟﺳﺕ ﺑﺣﺎﺟﺔ ﺍﻟﻰ ﺍﻋﺎﺩﺓ‬ ‫ﺑﺗﻐﺫﻳﺔ ﺍﻟﻭﺣﺩﺓ ﺑﺎﺷﺎﺭﺗﻳﻥ ‪transport‬‬ ‫ﺍﻟﻐﻳﺭ ﻣﺗ ﺯﺍﻣﻧﺔ ﻭ ﻫﻰ ﻁﺭﻳﻘﺔ ﺍﺭﺳﺎﻝ ﻭ‬ ‫ﺍﻟﺣﻭﺍﺳﺏ ﺍﻟﻣﺣﻠﻳﺔ ‪ ،LAN‬ﻳﻣﻛﻧﻙ‬ ‫ﺑﺙ ﻛﻝ ﺍﻻﺷﺎ ﺭﺍﺕ ﺍﻻﺭﺿﻳﺔ ﺍﻟﻣﺗﺎﺣﺔ‬ ‫‪ stream‬ﻣﻧﻔﺻﻠﺗﻳﻥ. ﺍﻟﻭﺣﺩﺓ ﺍﻟﺗﺎﻟﻳﺔ‬ ‫ﻧﻘﻝ ﺍﻻﺷﺎ ﺭﺍﺕ ﺍﻟﺧﺎﺿﻌﺔ ﻟﺑﺭﻭﺗﻭﻛﻭﻻﺕ‬ ‫ﺿﺑﻁ ﻛﻝ ﺍﻻﻋﺩﺍﺩﺍﺕ ﺑﻁﺭﻳﻘﺔ ﺍﺳﻬﻝ‬ ‫ﻋﺑﺭ ﺍﻟﻬﻭﺍء ﻭ ﻟﻛﻧﻙ ﺑﺣﺎﺟﺔ ﺍﻟﻰ ﺍﺿﺎﻓﺔ‬ ‫ﻫﻰ ﻭﺣﺩﺓ 202-‪ ،DT‬ﻭ ﺗﺣﺗﻭﻯ ﻋﻠﻰ‬ ‫ﺍﻟﺑﺙ ﺍﻟﺭﻗﻣﻰ ‪.transport stream‬‬ ‫ﺩﺍﺧﻝ ﺍﺣﺩ ﺍﻟﺗﻁﺑﻳﻘﺎﺕ ﻋﻠﻰ ﺟﻬﺎﺯ‬ ‫ﻣﺣﺗﻭﻯ ﻣﻥ ﺍﻟﻣﺣﺗﻭﻳﺎﺕ ﺍﻟﺗﻰ ﺗﺑﺙ‬ ‫ﻣﺣﻭﻝ ‪ transmodulator‬ﺛﻧﺎﺋﻰ‬ ‫ﻓﻭﺣﺩﺓ 203-‪ DT‬ﺗﻣﻛﻧﻧﺎ ﻣﻥ ﺍﺧﺗﻳﺎﺭ‬ ‫ﺍﻟﺣﺎﺳﺏ ﺍﻟﺷﺧﺻﻰ ‪ .PC‬ﻭ ﻋﻠﻰ‬ ‫ﻋﺑﺭ ﺍﻻﻗﻣﺎﺭ ﺍﻟﺻﻧﺎﻋﻳﺔ. ﻭ ﻓﻰ ﻛﺛﻳﺭ‬ ‫ﻟﻠﺗﺣﻭﻳﻝ ﻣﻥ ﻧﻅﺎﻡ ﺍﻟﺑﺙ ﺍﻟﺗﻠﻔﺯﻳﻭﻧﻰ‬ ‫ﺍﻟﺑ ﺭﺍﻣﺞ ﺍﻟﺗﻰ ﻧﺭﻳﺩ ﺍﻣ ﺭﺍﺭﻫﺎ. ﻭ ﺑﺎﻟﺗﺎﻟﻰ‬ ‫ﺍﻟﻠﻭﺣﺔ ﺍﻟﺧﻠﻔﻳﺔ ﻧﺟﺩ ﻣﻘﺑﺱ ﺍﻟﻁﺎﻗﺔ ﻭ‬ ‫ﻣﻥ ﺍﻻﺣﻳﺎﻥ ﻗﺩ ﺗﺣﺏ ﺍﺫﺍﻋﺔ ﺑﻌﺽ‬ ‫ﺍﻟﺭﻗﻣﻰ ﻋﺑﺭ ﺍﻟﻘﻣﺭ ﺍﻟﺻﻧﺎﻋﻰ ﺍﻟﻰ‬ ‫ﻓﻼ ﺣﺎﺟﺔ ﻟﻧﺎ ﺑﺎﻥ ﻧﻘﻭﻡ ﺑﺎﻋﺎﺩﺓ ﺍﺭﺳﺎﻝ‬ ‫ﺯﺭ ﺍﻟﺗﺷﻐﻳﻝ ﻭ ﻗﻁﺎﻉ ﺃﻧﺎﺑﻳﺏ ﺍﻟﺟﻬﺩ‬ ‫ﺍﻟﻣﺣﺗﻭﻳﺎﺕ ﻣﻥ ﺍﻟﻣﺻﺎﺩﺭ ﺍﻟﺳﻣﻌﻳﺔ‬ ‫ﻧﻅﺎﻡ ﺍﻟﺑﺙ ﺍﻻﺭﺿﻰ ‪ .DVB-T‬ﻭ ﻫﺫﻩ‬ ‫ﻛﻝ ﻗﻧﺎﺓ ﻣﻥ ﻣﺳﺗﺟﻳﺏ ‪transponder‬‬ ‫ﺍﻟﻛﺭﺑﻰ ﻭ ﻣﻘﺎﺑﺱ ﻣﻥ ﺍﺟﻝ ﻛﺎﺑﻼﺕ‬ ‫ﺍﻭ ﺍﻟﺑﺻﺭﻳﺔ ‪ .A/V sources‬ﻓﻌﻠﻰ‬ ‫ﺍﻟﻭﺣﺩﺍﺕ ﺗﻘﺩﻡ ﺍﻟﺣﻝ ﺍﻷﺑﺳﻁ ﻭ ﺍﻷﻗﻝ‬ ‫ﻣﻌﻳﻥ ﻭ ﻟﻛﻥ ﻓﻘﻁ ﺍﻟﻘﻧﻭﺍﺕ ﺍﻟﺗﻰ ﻧﺭﻳﺩ‬ ‫ﺍﻟﺗﺣﻛﻡ ﻭ ﻣﺭﻭﺣﺔ ﺗﺑﺭﻳﺩ. ﻭ ﻫﺫﺍ ﻫﻭ‬ ‫ﺳﺑﻳﻝ ﺍﻟﻣﺛﺎﻝ، ﺗﻘﻭﻡ ﺍﻟﻔﻧﺎﺩﻕ ﺑﻌﺭﺽ‬ ‫ﺗﻛﻠﻔﺔ ﻟﺗﻭﺯﻳﻊ ﺍﻟﻘﻧﻭﺍﺕ ﺍﻟﻔﺿﺎﺋﻳﺔ ﺍﻟﺗﻰ‬ ‫ﺃﻥ ﻧﻌﺭﺿﻬﺎ ﻟﻠﻣﺷﺗﺭﻛﻳﻥ. ﻭ ﻣﻥ ﺍﻟﻣﺛﻳﺭ‬ ‫ﺑﺎﻟﻔﻌﻝ ﺍﻟﻣﻭﺟﻭﺩ ﺑﺄﻧﻅﻣﺔ ﺍﻻﺳﺗﻘﺑﺎﻝ‬ ‫ﺑﻌﺽ ﺍﻟﻣﻌﻠﻭﻣﺎﺕ ﺑﺻﻭﺭﺓ ﺩﻭﺭﻳﺔ ﻣﻥ‬ ‫ﺗﺑﺙ ﻋﺑﺭ ﺍﻟﻬﻭﺍء ‪ FTA‬ﻭ ﺍﻟﺗﻰ ﻻ ﺗﺣﺗﺎﺝ‬ ‫ﺑﻭﺭﺓ ﺧﺎﺻﺔ ﻓﻰ ﻫﺫﻩ ﺍﻟﻭﺣﺩﺓ ﻫﻭ‬ ‫‪ headends‬ﺍﻟﻣﺣﺗﺭﻓﺔ. ﺇﻥ ﻣ ﺭﺍﻭﺡ‬ ‫ﺃﺟﻝ ﺯﺍﺋﺭﻳﻬﺎ. ﻭ ﻓﻰ ﺍﻟﻧﻬﺎﻳﺔ، ﻻ ﻳﻣﻛﻧﻙ‬ ‫ﺍﺳﺗﺧﺩﺍﻡ ﺍﻯ ﻣﻥ ﺍﻟﻛﺭﻭﺕ ﺍﻟﺫﻛﻳﺔ.‬ ‫ﻭﺣﺩﺗﻰ ﺍﻻﺳﺗﺧﺩﺍﻡ ﺍﻟﻣﺷﺭﻭﻁ ‪CAM‬‬ ‫ﺍﻟﺗﺑﺭﻳﺩ ﺗﺻﺩﺭ ﺑﻌﺽ ﺍﻟﺿﺟﻳﺞ ﻭ ﻟﻛﻥ‬ ‫ﺍﻥ ﺗﻧﺳﻰ ﺷﺑﻛﺔ ﺍﻻﻧﺗﺭﻧﺕ ﻭ ﺍﻟﺑﺙ‬ ‫ﺍﻟﻣﻭﺟﻭﺩﻳﻥ ﺗﺣﺕ ﺍﻟﻐﻁﺎء ﺍﻟﻌﻠﻭﻯ.‬ ‫ﺩﺍﺋﻣﺎ ﻣﺎ ﻻ ﻳﺗﻡ ﻭﺿﻊ ﻫﺫﻩ ﺍﻻﺷﻳﺎء ﻓﻰ‬ ‫ﺍﻟﺗﻠﻔﺯﻳﻭﻧﻰ ﻋﺑﺭ ﺷﺑﻛﺔ ﺍﻻﻧﺗﺭﻧﺕ ﺃﻭ‬ ‫ﻭ ﻛﻣﺎ ﺗﺭﻯ ﻓﻰ ﺍﻟﺻﻭﺭﺓ، ﻓﻭﺣﺩﺓ‬ ‫ﻓﻌﻧﺩ ﺍﺩﺧﺎﻝ ﻛﺎﺭﺕ ﺫﻛﻰ ‪smart‬‬ ‫ﺍﻟﻐﺭﻓﺔ ﺍﻟﺗﻰ ﻣﻥ ﺍﻟﻣﺗﻭﻗﻊ ﺃﻥ ﻳﻌﻣﻝ ﺑﻬﺎ‬ ‫ﻣﺎ ﻳﻌﺭﻑ ﺑﻣﺻﻁﻠﺢ )‪ .(IPTV‬ﻟﻣﺎﺫﺍ‬ ‫405-‪ DT‬ﻫﻰ ﺍﺗﺎﻟﻳﺔ. ﻭ ﺑﻬﺎ 4‬ ‫‪ card‬ﺻﺎﻟﺢ ﺍﻻﺳﺗﺧﺩﺍﻡ ، ﻓﺳﻳﻣﻛﻧﻙ‬ ‫ﺍﻷﺷﺧﺎﺹ ﻟﺳﺎﻋﺎﺕ. ﻭ ﻳﺗﻡ ﺗﻭﺻﻳﻝ‬ ‫ﻻ ﺗﺟﻌﻠﻪ ﻫﻭ ﺃﻳﺿﺎ ﻣﺗﺎﺣﺎ ﻟﻣﺷﺗﺭﻛﻰ‬ ‫ﻣﺩﺍﺧﻝ ﻟﻠﺻﻭﺕ ﻭ ﺍﻟﺻﻭﺭﺓ ﻭ ﻫﻰ‬ ‫ﻓﻙ ﺗﺷﻔﻳﺭ ﺍﻟﻘﻧﻭﺍﺕ ﺍﻟﻔﺿﺎﺋﻳﺔ! ﻭ‬ ‫ﻭﺣﺩﺓ ﺍﻟﺗﺣﻛﻡ ﻭ ﻣﺯﻭﺩ ﺍﻟﻁﺎﻗﺔ -‪DT‬‬ ‫ﺷﺑﻛﺔ ﻛﺎﺑﻼﺕ ﺍﻟﺑﺙ ﺍﻟﻠﻔﺯﻳﻭﻧﻰ؟ ﺇﻥ‬ ‫ﻣﺄﻟﻭﻓﺔ ﻟﺩﻯ ﻛﻝ ﻗ ﺭﺍﺋﻧﺎ. ﻧﻌﻡ، ﻫﺫﻩ ﻫﻰ‬ ‫ﺑﻬﺫﻩ ﺍﻟﻁﺭﻳﻘﺔ ﻳﻣﻛﻥ ﺗﺯﻭﻳﺩ ﺷﺑﻛﺔ‬ ‫008 ﺑﺟﻣﻳﻊ ﺍﻟﻭﺣﺩﺍﺕ ﺍﻻﺧﺭﻯ ﺑﻭﺍﺳﻁﺔ‬ ‫ﻛﻝ ﺍﻻﻣﻧﻳﺎﺕ ﺍﻟﺳﺎﺑﻘﺔ ﻫﻰ ﻓﻰ ﺍﻟﺣﻘﻳﻘﺔ‬ ‫ﻣﺩﺍﺧﻝ ﺍﻟﺻﻭﺕ ﻭ ﺍﻟﺻﻭﺭﺓ ﺍﻟﺗﻧﺎﻅﺭﻳﺔ‬ ‫ﻛﺎﺑﻼﺕ ﺍﻟﺗﻠﻔﺯﻳﻭﻥ ﺑﺎﻟﻘﻧﻭﺍﺕ ﺍﻟﻔﺿﺎﺋﻳﺔ‬ ‫ﻛﺎﺑﻼﺕ ﻣﺗﻌﺩﺩﺓ ﺍﻻﺳﻼﻙ. ﻛﻣﺎ ﻳﻣﻛﻧﻬﺎ‬ ‫ﺍﻟﻣﺗﻁﻠﺑﺎﺕ ﺍﻟﺗﻰ ﺃﺧﺫﻫﺎ ﻣﻬﻧﺩﺳﻭ ﺷﺭﻛﺔ‬ ‫‪ Analog‬ﺍﻟﻣﻌﺗﺎﺩﺓ. ﺣﻳﺙ ﻳﻣﻛﻥ‬ ‫ﺍﻻﺻﻠﻳﺔ.‬ ‫ﺍﻟﺗﺣﻛﻡ ﺑﻣﺎ ﻳﺻﻝ ﺍﻟﻰ 7 ﻭﺣﺩﺍﺕ.‬ ‫‪ Promax‬ﻓﻰ ﺍﻋﺗﺑﺎﺭﻫﻡ ﻋﻧﺩﻣﺎ ﻗﺎﻣﻭﺍ‬ ‫‪38 TELE-satellite — Global Digital TV Magazine — 12-01/2010 — www.TELE-satellite.com‬‬
‫‪ Combiner/Amplifier‬ﻭ ﺍﻟﺗﻰ ﺗﺄﺧﺫ‬ ‫ﺍﺩﺧﺎﻝ ﺍﻻﺷﺎ ﺭﺍﺕ ﺍﻟﻘﺎﺩﻣﺔ ﻣﻥ ﻣﺷﻐﻝ‬ ‫ﺣﺗﻰ 8 ﺍﺷﺎ ﺭﺍﺕ ﺑﺙ ﺗﻠﻳﻔﺯﻳﻭﻧﻰ ﺭﻗﻣﻰ‬ ‫ﺍﻗ ﺭﺍﺹ ‪ DVD‬ﺍﻭ ﻣﺳﺟﻝ ﺷ ﺭﺍﺋﻁ ﻓﻳﺩﻳﻭ‬ ‫ﺃﺭﺿﻰ ‪ DVB-T‬ﺣﺎﻣﻠﺔ ‪carriers‬‬ ‫‪ VCR‬ﺃﻭ ﻣﻥ ﺟﻬﺎﺯ ﺍﺳﺗﻘﺑﺎﻝ ﺃﻗﻣﺎﺭ‬ ‫ﻭﺗﻘﻭﻡ ﺑﺎﺧ ﺭﺍﺟﻬﻡ ﻛﻠﻬﻡ ﻓﻰ ﻛﺎﺑﻝ ﻭﺍﺣﺩ. ﻭ‬ ‫ﺻﻧﺎﻋﻳﺔ ﺃﻭ ﻣﻥ ﻛﺎﻣﻳ ﺭﺍ ﻣ ﺭﺍﻗﺑﺔ ﺍﻣﻧﻳﺔ ﺃﻭ‬ ‫ﻫﺫﺍ ﺳﻳﻛﻭﻥ ﺑﻁﺑﻳﻌﺔ ﺍﻻﻣﺭ ﻛﺎﺑﻝ ﺍﺧ ﺭﺍﺝ‬ ‫ﻣﻥ ﺍﻯ ﻣﺻﺩﺭ ﺍﺧﺭ. ﺣﻳﺙ ﻳﺗﻡ ﺗﺣﻭﻳﻝ‬ ‫ﻟﺗﻐﺫﻳﺔ ﺍﻟﺷﺑﻛﺔ ﺑﻛﺎﻣﻠﻬﺎ.‬ ‫ﻛﻝ ﻭﺍﺣﺩ ﻣﻥ ﻫﺫﻩ ﺍﻟﻣﺩﺧﻼﺕ ﺍﻟﯩﻘﻧﺎﺓ‬ ‫ﺭﻗﻣﻳﺔ ﻣﻧﻔﺻﻠﺔ ﻋﻧﺩ ﻣﺧﺭﺝ ﻫﺫﻩ ﺍﻟﻭﺣﺩﺓ‬ ‫ﺍﻟﺗﺭﻛﻳﺏ‬ ‫405-‪ .DT‬ﻭ ﺑﻬﺫﻩ ﺍﻟﻁﺭﻳﻘﺔ، ﺗﺣﺻﻝ‬ ‫ﻋﻠﻰ ﺍﺷﺎﺭﺓ ﺣﺣﺎﻣﻠﺔ ‪ carrier‬ﺗﺣﺗﻭﻯ‬ ‫ﻭ ﺑﻣﺟﺭﺩ ﺗﺭﻛﻳﺏ ﻛﻝ ﻭﺣﺩﺓ ﻭ ﺗﻭﺻﻳﻠﻬﻡ‬ ‫ﻋﻠﻰ ﺃﺭﺑﻊ ﻗﻧﻭﺍﺕ.‬ ‫ﻋﻠﻰ ﺍﻟﻠﻭﺣﺔ ﺍﻟﺧﻠﻔﻳﺔ ﺑﻛﺎﺑﻼﺕ ﺍﻟﺗﺣﻛﻡ ﻭ‬ ‫ﺍﻟﻭﺣﺩﺓ ﺍﻻﺧﻳﺭﺓ ﺍﻟﻭﺍﺣﺩﺓ ﻫﻰ -‪ DT‬ﺍﻻﺷﺎﺭﺓ، ﻓﺎﻥ ﺟﻬﺎﺯ ﺍﻟﺗﺣﻭﻳﻝ ‪DTTV‬‬ ‫212، ﻭ ﻫﻰ ﻋﺑﺎﺭﺓ ﻋﻥ ﻭﺣﺩﺓ ﺗﺣﻭﻳﻝ ﻳﻛﻭﻥ ﺟﺎﻫﺯ ﻟﻼﻋﺩﺍﺩ. ﻭ ﺑﺎﻟﺭﻏﻡ ﻣﻥ ﺃﻥ‬ ‫ﻛﻣﺎ ﺗﻘﻭﻡ ﻭﺣﺩﺓ ﺍﻟـ 201-‪ DT‬ﺑﺗﺣﻭﻳﻝ ﺍﺷﺎﺭﺗﻳﻥ ‪ transport stream‬ﺍﻟﻰ ﺍﺷﺎﺭﺗﻳﻥ ﺑﺙ ■ ﻭ ﺗﺿﻣﻳﻥ ‪ transmodulator‬ﻟﻠﺑﺙ ﻋﺩﺩ ﺍﻻﺯﺭﺍﺭ ﻣﺣﺩﻭﺩ ﺑﺳﺗﺔ ﺃﺯﺭﺍﺭ ﻓﻘﻁ:‬ ‫ﺍﻟﺗﻠﻳﻔﺯﻳﻭﻧﻰ ﺍﻟﺭﻗﻣﻰ ﺍﻻﺭﺿﻰ-‪ DVB‬ﺃﺭﺑﻌﺔ ﺃﺳﻬﻡ ﻭ ﺯﺭ ﺍﺩﺧﺎﻝ ‪ ENTER‬ﻭ‬ ‫ﺭﻗﻣﻰ ﺍﺭﺿﻰ ‪ DVB-T‬ﺍﻟﻣﻌﺗﺎﺩ ﻭ ﻣﺗﺩﺍﺧﻠﺗﻳﻥ ﺃﻭ ‪ multiplexed‬ﺑﺗﻘﻧﻳﺔ ﺍﻟـ ‪.COFDM‬‬ ‫ﻭﻳﻣﻛﻧﻙ ﻣﺷﺎﻫﺩﺓ ﺍﻟﻁﻳﻑ ﺍﻟﺗﺭﺩﺩﻯ ‪ spectrum‬ﻟﻬﻡ ﻓﻰ ﺍﻟﺻﻭﺭﺓ ﺍﻟﻣﻭﺿﺣﺔ. ﻟﻘﺩ ﻗﻣﻧﺎ ﺑﺟﻌﻝ‬ ‫ﺯﺭ ﺧﺭﻭﺝ ‪ ،ESC‬ﺇﻻ ﺃﻥ ﻋﻣﻠﻳﺔ ﺍﻋﺩﺍﺩ‬ ‫‪ .T‬ﻓﺑﻌﺩ ﺍﺳﺗﻘﺑﺎﻝ ﺍﺷﺎﺭﺓ ﺭﻗﻣﻳﺔ ﺍﺭﺿﻳﺔ‬ ‫ﺃﺣﺩ ﻣﺳﺗﻭﻳﺎﺗﻬﻡ ﺃﻗﻝ ﺑـ 02 ﺩﻳﺳﺑﻝ. ﻫﺫﺍ ﻭ ﺇﻻ ﺳﻳﻛﻭﻧﻭﺍ ﺑﻧﻔﺱ ﺍﻟﻘﻭﺓ.‬ ‫ﻳﻣﻛﻥ ﺗﻐﻳﻳﺭ ﺗﺭﺩﺩﻫﺎ ﺍﻟﻰ ﺗﺭﺩﺩ ﺍﺧﺭ. ﺍﻟﺟﻬﺎﺯ ﺳﻬﻠﺔ ﺑﺻﻭﺭﺓ ﻣﺩﻫﺷﺔ. ﻓﺑﻣﺟﺭﺩ‬ ‫ﻭ ﻳﺗﻡ ﻫﺫﺍ ﻟﻣﻧﻊ ﺑﻌﺽ ﺍﻟﺗﺩﺍﺧﻼﺕ ﺗﺯﻭﻳﺩ ﺍﻟﺟﻬﺎﺯﺑﺎﻟﻁﺎﻗﺔ ﻭ ﺗﺷﻐﻳﻠﻪ، ﺗﻘﻭﻡ‬ ‫ﺍﻟﻐﻳﺭ ﻣﺭﻏﻭﺏ ﻓﻳﻬﺎ ﺑﻳﻥ ﺍﻻﺷﺎ ﺭﺍﺕ ﻭﺣﺩﺓ ﺍﻟﺗﺣﻛﻡ 008-‪ DT‬ﺑﺎﻟﺗﻌﺭﻑ ﻋﻠﻰ‬ ‫ﺩﺍﺧﻝ ﺍﻟﺷﺑﻛﺔ. ﻭﻣﻥ ﺍﺣﺩ ﺍﻟﻭﻅﺎﺋﻑ ﺍﻟﻭﺣﺩﺍﺕ ﺍﻻﺧﺭﻯ ﺍﻟﻣﺗﺻﻠﺔ ﺑﻬﺎ. ﻭ ﺑﻌﺩ‬ ‫ﺍﻟﻬﺎﻣﺔ ﻟﻬﺫﻩ ﺍﻟﻭﺣﺩﺓ ﻫﻰ ﺗﺣﺳﻳﻥ ﺟﻭﺩﺓ ﺛﻭﺍﻧﻰ ﻗﻠﻳﻠﺔ، ﻳﻣﻛﻧﻧﺎ ﺍﻟﺿﻐﻁ ﻋﻠﻰ ﺯﺭ‬ ‫ﺍﻻﺷﺎﺭﺓ. ﺣﻳﺙ ﺗﻘﻭﻡ ﺑﺎﺯﺍﻟﺔ ﺗﺿﻣﻳﻥ ﺍﻟﺩﺧﻭﻝ ‪ .ENTER‬ﻭ ﺑﻌﺩ ﺫﻟﻙ ﺳﻳﺗﻡ‬ ‫ﺗﻘﻭﻡ ﺳﺅﺍﻟﻙ ﻋﻥ ﻛﻠﻣﺔ ﺍﻟﺳﺭ )‪ ،(PIN‬ﻭ‬ ‫ﻭ‬ ‫‪demodulate‬ﺍﻻﺷﺎﺭﺓ‬ ‫ﺑﻌﺩﻫﺎ ﺗﺧﺗﺎﺭ ﺍﻟﻭﺣﺩﺓ ﺍﻟﺗﯩﺗﺭﻳﺩ ﺃﻥ ﺗﻘﻭﻡ‬ ‫ﺑﺗﺻﺣﻳﺢ ﺍﻟﺑﻳﺕ ‪ bits‬ﺍﻟﺧﺎﻁﺋﺔ ﺛﻡ ﺗﻌﻳﺩ‬ ‫ﺗﺿﻣﻳﻧﻬﺎ ‪ re-modulate‬ﻣﺭﺓ ﺃﺧﺭﻯ ﺑﺿﺑﻁﻬﺎ ) ﻭﻫﺫﺍ ﻋﻥ ﻁﺭﻳﻕ ﺍﻟﺳﻬﻣﻳﻥ‬ ‫ﻛﺎﺷﺎﺭﺓ ﺑﺙ ﺭﻗﻣﻰ ﺍﺭﺿﻰ ‪ .DVB-T‬ﻭ ﺍﻟﺫﺍﻥ ﻳﺷﻳ ﺭﺍﻥ ﺍﻟﻰ ﺍﻟﻳﻣﻳﻥ ﻭ ﺍﻟﻳﺳﺎﺭ(.‬ ‫ﻛﻧﺗﻳﺟﺔ ﻟﻬﺫﺍ، ﻧﺣﺻﻝ ﻋﻠﻰ ﺍﺷﺎﺭﺓ ﺫﺍﺕ ﻭﻋﻧﺩﻣﺎ ﻳﺗﻡ ﻋﺭﺽ ﺍﻟﻭﺣﺩﺓ ﺍﻟﻣﻁﻠﻭﺑﺔ‬ ‫ﻧﺳﺑﺔ ‪ (C/N (Carrier to Noise‬ﺳﻳﻣﻛﻧﻙ ﺯﺭ ﺍﻟﺩﺧﻭﻝ ‪ ENTER‬ﻣﻥ‬ ‫ﺟﻳﺩﺓ ﺟﺩﺍ ﻣﻧﺎﺳﺑﺔ ﺣﺗﻰ ﻟﺷﺑﻛﺔ ﻛﺑﻳﺭﺓ ﺍﻟﺑﺩء ﻓﻰ ﺍﻋﺩﺍﺩ ﺍﻟﻣﺗﻐﻳ ﺭﺍﺕ ﺍﻟﻣﺗﻌﻠﻘﺔ ﺑﻬﺫﻩ‬ ‫ﺍﻟﻭﺣﺩﺓ. ﻭ ﺍﻟﺳﻬﻣﺎﻥ ﺍﻟﺫﺍﻥ ﻳﺷﻳ ﺭﺍﻥ ﺍﻟﻰ‬ ‫ﻣﻥ ﺍﻟﻛﺎﺑﻼﺕ.‬ ‫ﻭ ﺣﺗﻰ ﺑﻌﺩ ﺗﻘﻠﻳﻠﻬﺎ ﺑﻣﻘﺩﺍﺭ 02 ﺩﻳﺳﻳﺑﻝ ﻻ ﺗﺯﺍﻝ ﺍﺷﺎﺭﺓ ﺍﻟﺑﺙ ■‬ ‫ﺃﻋﻠﻰ ﻭ ﺃﺳﻔﻝ ﻳﻘﻭﻣﺎﻥ ﺑﺗﻐﻳﻳﺭ ﻗﻳﻣﺔ ﺍﻟﺭﻗﻡ‬ ‫ﺫﺍﺕ ﺟﻭﺩﺓ ﻋﺎﻟﻳﺔ. ﻻﺣﻅ ﻗﺭﺍءﺍﺕ ﻛﻝ ﻣﻥ ‪ DVB-T‬ﺍﻟﺭﻗﻣﻰ ﺍﻻﺭﺿﻰ‬ ‫ﻭ ﻓﻰ ﺍﻟﻧﻬﺎﻳﺔ، ﺍﻟﻭﺣﺩﺓ ﺍﻟﻣﻭﺟﻭﺩﺓ ﺃﻭ ﺍﻟﺣﺭﻑ ﺍﻷﺑﺟﺩﻯ ﻓﻳﻣﺎ ﻳﻘﻭﻡ ﺍﻟﺳﻬﻣﺎﻥ‬ ‫ﻭ ﻣﻌﺩﻝ ﺍﻟﺧﻁﺄ ﺑﻌﺩ ﺗﺻﺣﻳﺢ ﻓﻳﺗﻳﺭﺑﻰ ‪ CBER‬ﻣﻌﺩﻝ ﺧﻁﺄ ﺍﻟﻘﻧﺎﺓ‬ ‫ﻭ ﻣﻌﺩﻝ ﺧﻁﺄ ‪ C/N‬ﻭ ﻧﺳﺑﺔ ﺍﻻﺷﺎﺭﺓ ﺍﻟﻰ ﺍﻟﺗﺷﻭﻳﺵ ‪VBER‬‬ ‫ﺍﻟﻳﻣﻳﻥ ﻭ ﺍﻟﻳﺳﺎﺭ ﺑﺗﻐﻳﻳﺭ ﺍﻟﻣﻭﺿﻊ ﺩﺍﺧﻝ‬ ‫ﻓﻰ ﺃﻗﺻﻰ ﺍﻟﻳﻣﻳﻥ ﻫﻰ ﻭﺣﺩﺓ -‪DT‬‬ ‫.‪ MER‬ﺍﻟﺗﺿﻣﻳﻥ‬ ‫ﺍﻟﻌﺩﺩ ﺃﻭ ﺍﻻﺳﻡ. ﻭﻛﻝ ﺷﺊ ﻳﻌﻣﻝ ﺑﺎﻟﺣﺩﺱ‬ ‫017. ﻭ ﻫﻰ ﻋﺑﺎﺭﺓ ﻋﻥ ﺩﺍﻣﺞ ﻭ ﻣﻛﺑﺭ‬ ‫ﻭ ﻟﻘﺩ ﺗﻡ ﺍﻋﺎﺩﺓ ﺗﺿﻣﻳﻥ ‪ remodulate‬ﻗﻧﺎﺓ 4 ‪ ■FUN.tv‬ﻭ ﺑﺗﻠﻘﺎﺋﻳﺔ. ﻭ ﻋﻧﺩﻣﺎ ﺗﻘﻭﻡ ﺑﺎﻋﺩﺍﺩ ﺍﻟﻭﺣﺩﺓ‬ ‫ﻣﻥ ﺍﻟﻘﻣﺭ ﺍﻟﺻﻧﺎﻋﻰ ‪ HOTBIRD‬ﻋﻧﺩ 31 ﺩﺭﺟﺔ ﺷﺭﻗﺎ ﺍﻟﻰ 203-‪ DT‬ﻓﺳﺗﺣﺗﺎﺝ ﺍﻟﻰ ﺗﺯﻭﻳﺩﻫﺎ‬ ‫ﺑﻣﻌﻠﻭﻣﺎﺕ ﻛﺗﻠﻙ ﺍﻟﻣﻭﺟﻭﺩﺓ ﻓﻰ ﻗﻭﺍﺋﻡ‬ ‫ﻧﻅﺎﻡ ﺍﻟﺑﺙ ﺍﻟﺗﻠﻔﺯﻳﻭﻧﻰ ﺍﻟﺭﻗﻣﻰ ﺍﻻﺭﺿﻰ ‪ DVB-T‬ﻭ ﺗﻣﺕ‬ ‫ﻣﺷﺎﻫﺩﺗﻬﺎ ﻋﻠﻰ ﺷﺎﺷﺔ ﺟﻬﺎﺯ ﺗﺣﻠﻳﻝ ﺍﻻﺷﺎﺭﺍﺕ ‪signal‬‬ ‫ﺍﻻﻋﺩﺍﺩﺍﺕ ﺍﻟﺧﺎﺻﺔ ﺑﺎﺟﻬﺯﺓ ﺍﻻﺳﺗﻘﺑﺎﻝ‬ ‫‪.analyzer‬‬ ‫ﻣﺛﻝ: ﺗﺭﺩﺩ ﺍﻟﻣﺫﺑﺫﺏ ﺍﻟﻣﺣﻠﻰ ‪ ،LOF‬ﻭ‬ ‫ﺗﺭﺩﺩ ﺍﻟﻣﺳﺗﺟﻳﺏ ﺃﻭ ﺍﻟـ ‪transponder‬‬ ‫ﺍﻟﻣﻁﻠﻭﺏ، ﻭ ﺍﻟﻣﺩﻯ ﺍﻟﺗﺭﺩﺩﻯ )‪،(C/Ku‬‬ ‫ﻭ ﻣﺯﻭﺩ ﺍﻟﻁﺎﻗﺔ ﺍﻟﻛﻬﺭﺑﻳﺔ ﻟﻭﺣﺩﺓ ﺍﻟـ‬ ‫81/31( ‪ LNB‬ﻓﻭﻟﺕ، 0/22 ﻫﺭﺗﺯ(،‬ ‫ﻭ ﻧﻭﻉ ﺍﻟﻧﻅﺎﻡ ﺍﻟﺫﻯ ﺳﻳﺗﻡ ﺍﻟﺗﻌﺎﻣﻝ ﻣﻌﻪ‬ ‫)2‪ ،(DVB-S/S‬ﻭ ﻣﻌﺩﻝ ﺍﻟﺗﺭﻣﻳﺯ‬ ‫‪ .symbol rate‬ﻛﻣﺎ ﻳﻭﺟﺩ ﻫﻧﺎﻙ‬ ‫ﺍﺧﺗﻳﺎﺭ ﺍﺧﺭ ﻭﻫﻭ: ﻗﺎﺋﻣﺔ ﺍﻟﺧﺩﻣﺔ ﺃﻭ‬ ‫‪ .service list‬ﻓﺑﻣﺟﺭﺩ ﺍﻥ ﺗﻘﻭﻡ ﺍﻟﻭﺣﺩﺓ‬ ‫203-‪ DT‬ﺑﺎﻟﺗﻌﺭﻑ ﻋﻠﻰ ﺍﻟﻣﺳﺗﺟﻳﺏ ﺃﻭ‬ ‫ﺍﻟـ ‪ transponder‬ﻓﺳﺗﻘﻭﻡ ﺗﻠﻙ ﺍﻟﻘﺎﺋﻣﺔ‬ ‫ﺍﻟﻔﺭﻋﻳﺔ ﺑﻌﺭﺽ ﻛﻝ ﺍﻟﺧﺩﻣﺎﺕ ﺍﻟﺗﻰ‬ ‫ﺗﻡ ﺍﻟﺗﻌﺭﻑ ﻋﻠﻳﻬﺎ )ﻗﻧﻭﺍﺕ ﺗﻠﻔﺯﻳﻭﻧﻳﺔ،‬ ‫ﻭ ﻗﻧﻭﺍﺕ ﺍﺫﺍﻋﻳﺔ، ﻭ ﻗﻧﻭﺍﺕ ﺍﻟﺑﻳﺎﻧﺎﺕ(.‬ ‫ﻭﻋﻧﺩﺋﺫ ﻳﻛﻭﻥ ﺑﺎﻣﻛﺎﻧﻙ ﺍﺧﺗﻳﺎﺭ ﺗﻠﻙ‬ ‫ﺍﻟﺧﺩﻣﺎﺕ ﻓﻘﻁ ﺍﻟﺗﻰ ﺗﺭﻏﺏ ﺑﺎﺿﺎﻓﺗﻬﺎ ﻓﻰ‬ ‫ﺍﻟﺧﺭﺝ ﺍﻟﺫﻯ ﺗﺣﺻﻝ ﻋﻠﻳﻪ ﻣﻥ ﺍﻟﻭﺣﺩﺓ.‬ ‫ﺇﻥ ﺑﺎﻗﻰ ﺍﻟﺧﺩﻣﺎﺕ ﺳﻭﻑ ﺗﻛﻭﻥ ﻏﻳﺭ‬ ‫ﻣﺗﺎﺣﺔ. ﺇﺫﺍ ﻛﺎﻧﺕ ﺍﻟﺧﺩﻣﺎﺕ ﻣﺷﻔﺭﺓ،‬ ‫ﻓﺑﺎﻣﻛﺎﻧﻙ ﺍﺳﺗﺧﺩﺍﻡ ﻛﺎﺭﺕ ﺫﻛﻰ ‪smart‬‬ ‫‪ card‬ﻭ ﺍﺩﺧﺎﻟﻪ ﻓﻰ ﻭﺣﺩﺓ ﺍﻻﺳﺗﺧﺩﺍﻡ‬ ‫ﺍﻟﻣﺷﺭﻭﻁ ﺃﻭ ﻣﺎ ﺗﺳﻣﻰ ﺑﺎﻟـ ‪ CAM‬ﻭ‬ ‫ﺍﻟﺗﻰ ﺗﻡ ﺗﺭﻛﻳﺑﻬﺎ ﻓﻰ ﻫﺫﻩ ﺍﻟﻭﺣﺩﺓ. ﻭ‬ ‫ﻟﻠﻭﺻﻭﻝ ﻣﺎﺩﻳﺎ ﺍﻟﻰ ﻭﺣﺩﺓ ﺍﻟـ ‪،CAM‬‬ ‫ﻓﻛﻝ ﻣﺎ ﻋﻠﻳﻙ ﻓﻌﻠﻪ ﻫﻭ ﻓﻙ ﺍﻟﻐﻁﺎء‬ ‫ﺍﻟﻣﻭﺟﻭﺩ ﻋﻠﻰ ﺍﻟﻠﻭﺣﺔ ﺍﻟﻌﻠﻭﻳﺔ ﻟﻠﻭﺣﺩﺓ.‬ ‫‪40 TELE-satellite — Global Digital TV Magazine — 12-01/2010 — www.TELE-satellite.com‬‬
‫ﺍﻟﺷﺧﺻﻰ ‪ PC‬ﻭ ﺍﻟﻣﺣﻭﻝ ‪DTTV‬‬ ‫ﻓﻰ ﺍﻟﻭﺍﻗﻊ، ﺇﻥ ﻭﺣﺩﺓ 203-‪ DT‬ﺑﻬﺎ‬ ‫ﺑﺷﺑﻛﺔ ﺣﻭﺍﺳﻳﺏ ﻣﺣﻠﻳﺔ ‪ .LAN‬ﺛﻡ‬ ‫ﻭﺣﺩﺗﻳﻥ ﻣﻧﻔﺻﻠﺗﻳﻥ ﻟﻛﻝ ﻣﺩﺧﻝ.‬ ‫ﺗﻘﻭﻡ ﺑﻭﺿﻊ ﻋﻧﻭﺍﻥ ﺗﻌﺭﻳﻑ ﺍﻹﻧﺗﺭﻧﺕ‬ ‫‪ IP address‬ﻭ ﺍﻟﻘﻧﺎﻉ ﺍﻟﻔﺭﻋﻰ‬ ‫ﻭ ﻳﺗﻡ ﺍﻋﺩﺍﺩ ﺑﺎﻗﻰ ﺍﻟﻭﺣﺩﺍﺕ ﺑﻧﻔﺱ‬ ‫‪ submask‬ﻭ ﻋﻧﻭﺍﻥ ﺍﻟﺑﻭﺍﺑﺔ ﺍﻟﺭﺋﻳﺳﻳﺔ‬ ‫ﺍﻻﺳﻠﻭﺏ. ﻭ ﺇﺫﺍ ﻛﺎﻥ ﻟﻠﻭﺣﺩﺓ ﻣﺧﺭﺝ ﻟﻠﺑﺙ‬ ‫ﻟﻼﻧﺗﺭﻧﺕ ‪ gateway‬ﺩﺍﺧﻝ ﻭﺣﺩﺓ ﺍﻟـ‬ ‫ﺍﻟﺗﻠﻔﺯﻳﻭﻧﻰ ﺍﻟﺭﻗﻣﻰ ﺍﻻﺭﺿﻰ ‪،DVB-T‬‬ ‫008-‪ DT‬ﻳﺩﻭﻳﺎ. ﻣﻊ ﺍﻟﻌﻠﻡ ﺍﻥ ﻧﻅﺎﻡ‬ ‫ﻓﻼ ﺑﺩ ﻣﻥ ﺿﺑﻁ ﻣﺗﻐﻳ ﺭﺍﺕ ﻫﺫﺍ ﺍﻟﺑﺙ ﻣﺛﻝ:‬ ‫ﺗﺧﺻﻳﺹ ﻋﻧﺎﻭﻳﻥ ﺗﻌﺭﻳﻑ ﺍﻻﻧﺗﺭﻧﺕ‬ ‫ﺍﻟﺗﺭﺩﺩ ﻭ ﺍﻻﺿﻌﺎﻑ ‪ attenuation‬ﻭ‬ ‫ﺍﻟﺗﻠﻘﺎﺋﻰ ‪DHCP (Dynamic Host‬‬ ‫ﻧﻅﺎﻡ ﺍﻟﺗﺣﻭﻳﻝ ﺍﻟﺭﻗﻣﻰ ‪FFT mode‬‬ ‫‪ (Configuration Protocol‬ﻏﻳﺭ‬ ‫ﻭ ﻗﻳﻣﺔ ﺍﻟﻣﺩﻯ ﺍﻟﺗﺭﺩﺩﻯ ﺑﻳﻥ ﺍﻟﻘﻧﻭﺍﺕ‬ ‫ﻣﺩﻋﻭﻡ ﻓﻰ ﻫﺫﻩ ﺍﻟﻭﺣﺩﺓ. ﻭ ﻫﺫﺍ ﺃﺣﺩ‬ ‫ﺍﻟﻣﺗﺟﺎﻭﺭﺓ ‪ guard interval‬ﻭ ﻛﻳﻔﻳﺔ‬ ‫ﺍﻻﺷﻳﺎء ﺍﻟﻣﻌﺗﺎﺩﺓ ﻓﻰ ﺍﻻﺟﻬﺯﺓ ﺍﻟﻣﺣﺗﺭﻓﺔ.‬ ‫ﺍﻟﺗﺿﻣﻳﻥ ﺍﻟﺭﻗﻣﻰ ‪ Constellation‬ﻭ‬ ‫ﻭ ﻫﺫﺍ ﺍﻟﺗﻁﺑﻳﻕ ﻳﺟﻌﻝ ﻋﻣﻠﻳﺔ ﺍﻻﻋﺩﺍﺩ‬ ‫ﻣﻌﺩﻝ ﺍﻟﺗﺷﻔﻳﺭ ‪ Code Rate‬ﻭ ﻛﺫﻟﻙ‬ ‫ﺑﻛﺎﻣﻠﻬﺎ ﺃﺳﻬﻝ ﺑﻛﺛﻳﺭ. ﻟﺫﻟﻙ ﻓﺎﻥ ﻫﺫﺍ‬ ‫‪ DVB-T‬ﺍﻟﺗﻰ ﻣﻌﻧﺎ ﻓﻰ ﺍﺧﺗﺑﺎﺭ ﺍﻻﻋﺩﺍﺩ ﺗﻣﻛﻧﺕ ﻣﻥ ﺗﻭﻟﻳﺩ 6 ﺍﺷﺎﺭﺍﺕ ﺍﺭﺿﻳﺔ ‪ DTTV‬ﺇﻥ ﻭﺣﺩﺓ ﺍﻟﺗﺣﻭﻳﻝ ■ ﺃﻳﺿﺎ ﺍﻟﻣﺩﻯ ﺍﻟﺗﺭﺩﺩﻯ ﻟﻠﻘﻧﺎﺓ ‪Channel‬‬ ‫ﻳﻌﺩ ﻣﺳﺎﻋﺩﺓ ﺣﻘﻳﻘﻳﺔ ﻟﻣﻧﻡ ﻳﻘﻭﻡ ﺑﻌﻣﻠﻳﺔ‬ ‫ﻭ ﺑﻔﺭﺽ ﺃﻥ ﺑﻣﻘﺩﻭﺭ ﺍﻟﻔﺭﺩ ﺍﻥ ﻳﻛﻭﻥ ﻟﺩﻳﻪ ﻣﻥ .‪ COFDM‬ﺑﺗﻘﻧﻳﺔ ‪ Multiplexed‬ﻭ ﻗﺩ ﻛﺎﻧﺕ ﻣﺗﺩﺍﺧﻠﺔ ‪.Bandwidth‬‬ ‫ﺍﻟﺗﻧﺻﻳﺏ.‬ ‫ﻓﺈﻥ ﻭﺣﺩﺓ ﺍﻟﺗﺣﻭﻳﻝ ،‪ carrier‬ﻋﻠﻰ ﻛﻝ ﺍﺷﺎﺭﺓ ﺣﺎﻣﻠﺔ ‪ 8 SDTV‬ﺍﻟﻰ 01 ﻗﻧﻭﺍﺕ ﺗﻠﻔﺯﻭﻧﻲ ﺭﻗﻣﻳﺔ ﺗﻘﻠﻳﺩﻳﺔ‬ ‫!ﻳﻣﻛﻧﻬﺎ ﺃﻥ ﺗﺯﻭﺩﻧﺎ ﺑﻌﺩﺩ ﻣﻥ 04 ﺍﻟﻰ 06 ﻗﻧﺎﺓ ‪DTTV‬‬ ‫ﻭ ﻛﻣﺎ ﺗﺭﻯ، ﻓﺈﻥ ﻛﻣﻳﺔ ﺍﻻﻋﺩﺍﺩﺍﺕ‬ ‫ﺍﻻﺩﺍء‬ ‫ﻛﺑﻳﺭﺓ. ﻓﺎﺫﺍ ﺍﺭﺩﺕ ﺗﻐﻳﻳﺭ ﺑﻳﺎﻧﺎﺕ‬ ‫ﻣﺳﺗﺟﻳﺏ ‪ transponder‬ﺍﻟﺑﺙ‬ ‫ﺇﻥ ﺟﻭﺩﺓ ﺍﻻﺷﺎﺭﺓ ﺍﻟﺗﻰ ﻳﺧﺭﺟﻬﺎ‬ ‫ﺍﻟﺗﻠﻔﺯﻳﻭﻧﻰ ﺍﻟﺭﻗﻣﻰ ﻋﺑﺭ ﺍﻻﻗﻣﺎﺭ‬ ‫ﺍﻟﺟﻬﺎﺯ ﻋﻅﻳﻣﺔ ﺑﺎﻟﻔﻌﻝ. ﻭ ﻫﺫﺍ ﺃﻓﺿﻝ‬ ‫ﺍﻟﺻﻧﺎﻋﻳﺔ ‪ ،DVB-S‬ﻓﻬﺫﻩ ﻟﻳﺳﺕ‬ ‫ﺃﻓﺿﻝ ﺑﻛﺛﻳﺭ ﻣﻣﺎ ﺗﺳﺗﻁﻳﻊ ﺍﻟﺣﺻﻭﻝ‬ ‫ﻣﺷﻛﻠﺔ. ﺣﻳﺙ ﻳﻣﻛﻧﻙ ﺍﻟﻘﻳﺎﻡ ﺑﺫﻟﻙ ﻓﻰ‬ ‫ﻋﻠﻳﻪ ﻣﻥ ﻭﺣﺩﺓ ﺍﻟـ ‪ LNB‬ﻻﺳﺗﻘﺑﺎﻝ‬ ‫ﺧﻼﻝ ﻭﻗﺕ ﻗﺻﻳﺭ ﻟﻠﻐﺎﻳﺔ. ﻭ ﻟﻛﻥ ﺍﺫﺍ‬ ‫ﺍﻻﻗﻣﺎﺭ ﺍﻟﺻﻧﺎﻋﻳﺔ ﻭ ﻣﻥ ﻫﻭﺍﺋﻳﺎﺕ‬ ‫ﻛﺎﻥ ﻫﺫﺍ ﻫﻭ ﺍﻻﻋﺩﺍﺩ ﺍﻻﻭﻟﻰ ﻓﻘﺩ ﻳﺄﺧﺫ‬ ‫ﺍﺳﺗﻘﺑﺎﻝ ﺍﻟﺑﺙ ﺍﻻﺭﺿﻰ. ﻭ ﻫﺫﺍ ﻻﻥ‬ ‫ﻣﻧﻙ ﺑﻌﺽ ﺍﻟﻭﻗﺕ. ﻭ ﻟﺟﻌﻝ ﺍﻻﻣﺭ‬ ‫ﺍﻟﻭﺣﺩﺍﺕ ‪ modules‬ﻟﺩﻳﻬﺎ ﻣﻘﺩﻣﺎﺕ ﻭ‬ ‫ﻣﺭﻳﺣﺎ ﺃﻛﺛﺭ ﻣﻥ ﻫﺫﺍ، ﻓﻘﺩ ﻗﺎﻣﺕ‬ ‫ﻧﻬﺎﻳﺎﺕ ﺟﻳﺩﺓ ﺟﺩﺍ، ﻓﻬﻰ ﺗﻔﻙ ﺗﺿﻣﻳﻥ‬ ‫ﺷﺭﻛﺔ ‪ Promax‬ﺑﺗﻁﻭﻳﺭ ﺑﺭﻧﺎﻣﺞ‬ ‫ﺍﺷﺎ ﺭﺍﺕ ﺍﻟﺑﺙ ﺍﻟﺗﻠﻳﻔﺯﻳﻭﻧﻰ ﺍﻟﺭﻗﻣﻰ‬ ‫ﻳﺗﻡ ﺗﻧﺻﻳﺑﻪ ﻋﻠﻰ ﺣﺎﺳﺏ ﺷﺧﺻﻰ‬ ‫ﻋﺑﺭ ﺍﻻﻗﻣﺎﺭ ﺍﻟﺻﻧﺎﻋﻳﺔ 2‪DVB-S/S‬‬ ‫ﻟﻠﺗﺣﻛﻡ ﻓﻰ ﺍﻟﻣﺣﻭﻝ ‪ .DTTV‬ﻭ ﻟﻛﻥ‬ ‫ﺃﻭ ﺍﺷﺎ ﺭﺍﺕ ﺍﻟﺑﺙ ﺍﻟﺗﻠﻔﺯﻳﻭﻧﻰ ﺍﻟﺭﻗﻣﻰ‬ ‫ﺃﻭﻻ ﻻﺑﺩ ﻣﻥ ﺗﻭﺻﻳﻝ ﻛﻼ ﻣﻥ ﺍﻟﺣﺎﺳﺏ‬ ‫ﺗﻔﺎﺻﻳﻝ ﺍﻟﻘﻧﺎﺓ ﺍﻟﻔﺿﺎﻳﺔ ‪ PATIO.TV‬ﻭ ﻗﺩ ﺗﻡ ﺗﺣﻭﻳﻠﻬﺎ ﺍﻟﻰ ﻗﻧﺎﺓ ﺍﺭﺿﻳﺔ ‪■ .DVB-T‬‬ ‫ﺍﻻﺭﺿﻰ ‪ DVB-T‬ﺛﻡ ﺗﻘﻭﻡ ﺑﺗﺻﺣﻳﺢ‬ ‫ﺍﻻﺧﻁﺎء ‪ bit errors‬ﺛﻡ ﺗﻌﻳﺩ ﺗﺿﻣﻳﻥ‬ ‫‪ re-modulate‬ﺍﻻﺷﺎ ﺭﺍﺕ ‪transport‬‬ ‫‪ stream‬ﻟﺗﺻﺑﺢ ﻛﺎﺷﺎ ﺭﺍﺕ ﺍﻟﺑﺙ‬ ‫ﺍﻟﺗﻠﻔﺯﻳﻭﻧﻰ ﺍﻻﺭﺿﻰ ‪ .DVB-T‬ﻭ‬ ‫ﺑﻔﺿﻝ ﻫﺫﺍ، ﻻ ﺗﺟﺩ ﺃﺧﻁﺎء ‪bit errors‬‬ ‫ﻓﻰ ﺍﻻﺷﺎﺭﺓ ﺍﻟﺗﻰ ﻳﺧﺭﺟﻬﺎ ﺍﻟﺟﻬﺎﺯ.ﻭ‬ ‫ﻛﻝ ﺍﻟﻣﺗﻐﻳ ﺭﺍﺕ ﺍﻟﻣﺗﻌﻠﻘﺔ ﺑﺟﻭﺩﺓ ﺍﻻﺷﺎﺭﺓ‬ ‫ﻣﺛﻝ: ﻣﻌﺩﻝ ﺧﻁﺄ ﺍﻟﻘﻧﺎﺓ ‪ CBER‬ﻭ‬ ‫ﻣﻌﺩﻝ ﺍﻟﺧﻁﺄ ﺑﻌﺩ ﺗﺻﺣﻳﺢ ﻓﻳﺗﻳﺭﺑﻰ‬ ‫‪ VBER‬ﻭ ﻧﺳﺑﺔ ﺍﻻﺷﺎﺭﺓ ﺍﻟﻰ ﺍﻟﺗﺷﻭﻳﺵ‬ ‫‪ C/N‬ﻭ ﻣﻌﺩﻝ ﺧﻁﺄ ﺍﻟﺗﺿﻣﻳﻥ ‪MER‬‬ ‫ﻛﻠﻬﺎ ﻣﻣﺗﺎﺯﺓ ﻋﻠﻰ ﺍﻻﻁﻼﻕ. ﻭ ﻋﻧﺩﻣﺎ‬ ‫ﺗﻘﻭﻡ ﺑﺗﻭﺻﻳﻝ ﺟﻬﺎﺯ ﺗﻠﻔﺯﻳﻭﻥ ﺣﺩﻳﺙ‬ ‫ﻭﻟﻭ ﺣﺗﻰ ﻓﻰ ﻧﻬﺎﻳﺔ ﺷﺑﻛﺔ ﻛﺎﺑﻼﺕ ﻛﺑﻳﺭﺓ‬ ‫ﺟﺩﺍ ﺳﺗﻅﻝ ﺍﻻﺷﺎﺭﺓ ﺟﻳﺩﺓ ﺟﺩﺍ ﺟﺩﺍ. ﻭ ﺍﻧﻧﺎ‬ ‫ﻟﻡ ﻧﺟﺩ ﻭﻟﻭ ﻣﺗﻐﻳﺭ ﻭﺍﺣﺩ ﻣﻥ ﺍﻟﻣﺗﻐﻳ ﺭﺍﺕ‬ ‫ﺍﻟﺳﺎﺑﻘﺔ ﻟﻛﻰ ﻧﻌﺗﺭﺽ ﻋﻠﻳﻪ.‬ ‫ﺧﻼﺻﺔ ﺍﻟﻘﻭﻝ‬ ‫ﺇﻥ ﻭﺣﺩﺓ ﺍﻟﺗﺣﻭﻳﻝ ‪ DTTV‬ﻋﺑﺎﺭﺓ‬ ‫ﻋﻥ ﻧﻅﺎﻡ ﺍﺳﺗﻘﺑﺎﻝ ﺑﺙ ﺗﻠﻔﺯﻳﻭﻧﻰ ﺭﻗﻣﻰ‬ ‫ﺍﺭﺿﻰ ‪ DVB-T headend‬ﺫﺍﺕ ﺇﺷﺎﺭﺓ‬ ‫ﺧﺭﺝ ﻣﺛﺎﻟﻳﺔ ﻭ ﺍﻣﻛﺎﻧﻳﺔ ﺍﻋﺩﺍﺩ ﻫﺎﺋﻠﺔ‬ ‫ﺟﺩﺍ. ﺇﻥ ﺍﻟﻭﺣﺩﺍﺕ ﺍﻟﺗﻰ ﻛﺎﻧﺕ ﻟﺩﻳﻧﺎ ﻓﻰ‬ ‫ﺭﻑ ‪ rack‬ﺍﻻﺧﺗﺑﺎﺭ ﻣﺗﺎﺣﺔ ﻟﺩﻯ ﺷﺭﻛﺔ‬ ‫‪ Promax‬ﻭ ﻟﻛﻥ ﺍﻟﻘﻠﻳﻝ ﻣﻧﻬﺎ.ﻭ ﻟﻠﻣﺯﻳﺩ‬ ‫ﻣﻥ ﺍﻟﺗﻔﺎﺻﻳﻝ ﻳﻣﻛﻧﻙ ﺯﻳﺎﺭﺓ ﻣﻭﻗﻬﺎ ﺍﻟﺗﺎﻟﻰ‬ ‫.‪w w w.proma xelectronic s‬‬ ‫‪ com‬ﻋﻠﻰ ﺷﺑﻛﺔ ﺍﻻﻧﺗﺭﻧﺕ. ﻭ ﺇﺫﺍ ﻛﻧﺕ‬ ‫ﺗﻔﻛﺭ ﺑﺟﺩﻳﺔ ﻓﻰ ﻧﻅﺎﻡ ﺍﺳﺗﻘﺑﺎﻝ ﺍﺍﺭﺳﺎﻝ‬ ‫ﻋﺑﺭ ﺍﻟﻛﺎﺑﻼﺕ ‪cable headend‬‬ ‫ﻭ ﺗﺭﻳﺩ ﺃﻥ ﺗﻭﻓﺭ ﺟﻳﺩﺍ ﻓﻰ ﻣﺎﺩﻳﺎﺕ‬ ‫ﺍﻋﺩﺍﺩ ﻭ ﺗﻧﺻﻳﺏ ﻭﺣﺩﺓ ﺍﻟـ 203-‪ .DT‬ﻭ ﻳﻣﻛﻧﻙ ﺍﻥ ﺗﺭﻯ ﺍﻋﺩﺍﺩ ﺗﺭﺩﺩ ﺍﻟﻣﺳﺗﺟﻳﺏ ‪ transponder‬ﺍﻟﻣﺭﺍﺩ ﺍﺳﺗﻘﺑﺎﻟﻪ ﻗﺩ ﺗﻡ ﻓﻙ ﺗﺿﻣﻳﻧﻪ -‪ ■ demo‬ﺍﻟﻣﺷﺭﻭﻉ ﻓﻳﺟﺏ ﺍﻥ ﺗﺄﺧﺫ ﻓﻰ ﺍﻋﺗﺑﺎﺭﻙ‬ ‫ﻭﺣﺩﺓ ﺍﻟﺗﺣﻭﻳﻝ ‪.DTTV‬‬ ‫‪ dulated‬ﺍﻟﻰ ﺳﻳﻝ ﻧﻘﻰ ﻣﻥ ﺍﻟﺑﻳﺎﻧﺎﺕ ‪.transport stream‬‬ ‫‪42 TELE-satellite — Global Digital TV Magazine — 12-01/2010 — www.TELE-satellite.com‬‬
‫ﺭﺃﻯ ﺃﺣﺩ ﺍﻟﺧﺑﺭﺍء‬ ‫‪TECHNICAL‬‬ ‫+‬ ‫‪DATA‬‬ ‫ﺍﻻﻋﺩﺍﺩﺍﺕ ﻣﺭﻧﺔ ﺟﺩﺍ. ﻭ ﻭﺍﺟﻬﺔ ﻣﺳﺗﺧﺩﻡ ﺑﺳﻳﻁﺔ.‬ ‫‪Manufacturer‬‬ ‫‪Promax Electronica, S.A., Barcelona, Spain‬‬ ‫ﺍﻻﺷﺎﺭﺍﺕ ﺍﻟﺗﻰ ﻳﺧﺭﺟﻬﺎ ﺍﻟﺟﻬﺎﺯ ﺟﻳﺩﺓ ﻭ ﻗﻭﻳﺔ ﻟﻠﻐﺎﻳﺔ.‬ ‫‪Internet‬‬ ‫‪www.promaxelectronics.com‬‬ ‫‪info@promaxelectronics.com‬‬ ‫ﻻ ﺣﺎﺟﺔ ﻻﺟﻬﺯﺓ ﺍﺳﺗﻘﺑﺎﻝ ﺑﺙ ﺗﻠﻔﺯﻳﻭﻧﻰ ﺭﻗﻣﻰ ﻋﺑﺭ ﺍﻟﻛﺎﺑﻼﺕ‬ ‫‪Phone‬‬ ‫20 02 062 39 430+‬ ‫‪ DVBC set-top-boxes‬ﻋﻧﺩ ﺍﻟﻌﻣﻳﻝ.‬ ‫‪Fax‬‬ ‫62 11 833 39 430+‬ ‫-‬ ‫‪Jacek Pawlowski‬‬ ‫‪Model‬‬ ‫‪Digital To TV‬‬ ‫ﺑﻌﺽ ﺍﻟﺧﺻﺎﺋﺹ ﺍﻟﻭﻅﻳﻔﻳﺔ ﺍﻟﻣﻭﺟﻭﺩﺓ ﺑﺎﻧﻅﻣﺔ ﺍﻟﺑﺙ ﺍﻟﺗﻠﻔﺯﻳﻭﻧﻰ‬ ‫‪TELE-satellite‬‬ ‫‪Test Center‬‬ ‫ﺍﻟﺭﻗﻣﻰ ﻋﺑﺭ ﺍﻟﻛﺎﺑﻼﺕ ‪ DVB-C‬ﺍﻟﻌﺎﺩﻳﺔ )ﻣﺛﻝ ﺧﺎﺻﻳﺔ ﺍﻟﻘﻧﻭﺍﺕ‬ ‫‪Poland‬‬ ‫‪Description‬‬ ‫)‪DVB-T headend for cable networks (SMATV‬‬ ‫ﺍﻟﺗﻰ ﻳﺗﺻﻝ ﺍﻟﻣﺳﺗﺧﺩﻡ ﻣﻥ ﺧﻼﻟﻬﺎ ﺑﻣﺯﻭﺩ ﺍﻟﺧﺩﻣﺔ ﻭ ﺗﻘﻭﻡ ﺑﻧﻘﻝ‬ ‫‪Inputs‬‬ ‫‪DVB-S/S2, DVB-T (e.g. from the aerial), A/V analog, IPTV, TS-ASI‬‬ ‫ﺍﻟﺑﻳﺎﻧﺎﺕ ﻓﻰ ﺍﻻﺗﺟﺎﻩ ﺍﻟﻌﻛﺳﻰ ﻭ ﺗﺳﻣﻰ ‪ (return channel‬ﻣﺳﺗﺣﻳﻠﺔ ﻓﻰ ﻫﺫﺍ ﺍﻟﺟﻬﺎﺯ.‬ ‫‪Output‬‬ ‫‪DVB-T COFDM‬‬ ‫ﻛﺫﻟﻙ ﺍﻳﺿﺎ ﻋﺩﺩ ﺍﻟﻘﻧﻭﺍﺕ ﺍﻟﺭﻗﻣﻳﺔ ﺍﻟﻣﺳﻣﻭﺡ ﺑﻬﺎ ﺍﻗﻝ ﻣﻧﻬﺎ ﻓﻰ ﺣﺎﻟﺔ ﻧﻅﺎﻡ ﺍﻟﺑﺙ ‪DVB-C‬‬ ‫‪Power supply‬‬ ‫‪120/240 V 50/60 Hz‬‬ ‫) ﻭ ﻟﻛﻥ ﻫﺫﺍ ﺿﺭﻭﺭﻯ ﻓﻘﻁ ﺍﺫﺍ ﻛﻧﺕ ﺗﺭﻳﺩ ﺗﺯﻭﻳﺩ ﺍﻟﻣﺷﺗﺭﻛﻳﻥ ﺑﺎﻛﺛﺭ ﻣﻥ 002 ﻗﻧﺎﺓ(.‬ ‫■‬ ‫ﻟﻘﻁﺔ ﻟﺗﻁﺑﻳﻕ ﺍﻟﺗﺣﻛﻡ ﻓﻰ ﻧﻅﺎﻡ ﺍﻟﺗﺣﻭﻳﻝ ‪.DTTV‬‬ ‫■‬ ‫ﻭﺣﺩﺓ 203-‪ DT‬ﺑﻬﺎ ﻭﺣﺩﺗﻰ ﺍﺳﺗﺧﺩﺍﻡ ﻣﺷﺭﻭﻁ ﺃﻭ‪CAM (Conditional‬‬ ‫■‬ ‫ﺍﻟﻠﻣﺑﺎﺕ ‪ LED’s‬ﺍﻟﺗﻰ ﺗﺿﺋﺑﺎﻟﻠﻭﻥ ﺍﻻﺧﺿﺭ ﺗﺷﻳﺭ ﺍﻟﻰ ﺃﻥ ﻭﺣﺩﺓ 203-‪ DT‬ﻗﺩ‬ ‫‪ (Access Module‬ﻣﻭﺟﻭﺩﺓ ﺑﺎﻻﻋﻠﻰ ﺍﺳﻔﻝ ﻏﻁﺎء. ﻭ ﻫﻣﺎ ﻗﺎﺩﺭﺗﺎﻥ ﻋﻠﻰ ﻓﻙ‬ ‫ﺗﻭﺍﻓﻘﺕ ﻣﻊ ﻣﺳﺗﺟﻳﺏ ‪ transponder‬ﺍﻟﻘﻣﺭ ﺍﻟﺻﻧﺎﻋﻰ ﻭ ﺃﻥ ﻭﺣﺩﺓ 201-‪DT‬‬ ‫ﺗﺷﻔﻳﺭ ﺍﻟﻘﻧﻭﺍﺕ ﺍﻟﻣﺷﻔﺭﺓ. ﻭ ﺑﺎﻟﻁﺑﻊ ﻫﺫﺍ ﻳﺗﻁﻠﺏ ﻣﻧﻙ ﺍﻥ ﺗﺿﻊ ﻛﺭﻭﺕ ﺫﻛﻳﺔ ﺻﺎﻟﺣﺔ‬ ‫ﺗﻘﻭﻡ ﺑﺎﺧﺭﺍﺝ ﺍﺷﺎﺭﺓ ﺑﺙ ﺗﻠﻔﺯﻳﻭﻧﻰ ﺭﻗﻣﻰ ﺍﺭﺿﻰ ‪ DVB-T‬ﺻﺣﻳﺣﺔ.‬ ‫ﺍﻻﺳﺗﺧﺩﺍﻡ.‬ ‫‪www.TELE-satellite.com — 12-01/2010 — TELE-satellite — Global Digital TV Magazine‬‬ ‫34‬

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Horizon
 

Promax

  • 1. ‫‪TEST REPORT‬‬ ‫ﺟﻬﺎﺯ ﺗﺿﻣﻳﻥ ﺑﺙ ﺍﻟﻔﻳﺩﻳﻭ ﺍﻟﺭﻗﻣﻰ ﺍﻻﺭﺿﻰ ﻋﺑﺭ ﺍﻟﻛﺎﺑﻼﺕ‬ ‫0102/10-21‬ ‫‪Promax‬‬ ‫‪PROMAX DIGITAL TO TV‬‬ ‫‪The perfect solution to distribute digital‬‬ ‫‪signals to a cable network in absolute‬‬ ‫.‪error-free quality‬‬ ‫‪Digital To TV headend‬‬ ‫ﻫﻝ ﺗﺭﻳﺩ ﺑﺙ ﺗﻠﻳﻔﺯﻳﻭﻧﻰ ﺭﻗﻣﻰ ﻋﺑﺭ ﺍﻟﻛﺎﺑﻼﺕ؟‬ ‫ﻫﺫﺍ ﺃﻣﺭ ﺳﻬﻝ!‬ ‫ﻛﻣﺎ ﻫﻭ ﻣﻌﺭﻭﻑ ﻓﺎﻥ ‪ DVB-S‬ﻫﻰ ﺍﻟﻣﻭﺍﺻﻔﺎﺕ ﺍﻟﻘﻳﺎﺳﻳﺔ ﻟﻠﺑﺙ ﺍﻟﺗﻠﻳﻔﺯﻳﻭﻧﻰ ﺍﻟﺭﻗﻣﻰ ﻋﺑﺭ ﺍﻻﻗﻣﺎﺭ ﺍﻟﺻﻧﺎﻋﻳﺔ . ﻭ ﻛﺫﻟﻙ‬ ‫‪ DVB-T‬ﻫﻰ ﺍﻟﻣﻭﺍﺻﻔﺎﺕ ﺍﻟﻘﻳﺎﺳﻳﺔ ﻟﻠﺑﺙ ﺍﻟﺗﻠﻔﺯﻳﻭﻧﻰ ﺍﻻﺭﺿﻰ. ﻭ ‪ DVB-C‬ﻫﻰ ﺍﻟﻣﻭﺍﺻﻔﺎﺕ ﺍﻟﻘﻳﺎﺳﻳﺔ ﻟﻠﺑﺙ ﺍﻟﺗﻠﻔﺯﻳﻭﻧﻰ‬ ‫ﺍﻟﺭﻗﻣﻰ ﻋﺑﺭ ﺍﻟﻛﺎﺑﻼﺕ. ﻟﺫﻟﻙ ﺍﺫﺍ ﺍﺭﺩﺕ ﻋﻣﻝ ﺷﺑﻛﺔ ﺗﻠﻳﻔﺯﻳﻭﻧﻳﺔ ﻟﺗﺯﻭﻳﺩ ﻋﺩﺩ ﻣﺎ ﻣﻥ ﺍﻟﻣﺳﺗﺧﺩﻣﻳﻥ ﺑﺎﻟﺑﺙ ﺍﻟﺭﻗﻣﻰ ﺍﻟﺗﻠﻳﻔﺯﻳﻭﻧﻰ‬ ‫ﻓﺳﺗﺣﺗﺎﺝ ﺃﻥ ﺗﺯﻭﺩﻫﻡ ﺟﻣﻳﻌﺎ ﺑﺄﺟﻬﺯﺓ ﺍﺳﺗﻘﺑﺎﻝ ﺧﺎﺻﺔ ﺑﺎﻟﺑﺙ ﺍﻟﺗﻠﻳﻔﺯﻳﻭﻧﻰ ﺍﻟﺭﻗﻣﻰ ﻋﺑﺭ ﺍﻟﻛﺎﺑﻼﺕ ﻭﺍﻟﺗﻰ ﺗﺩﻋﻡ ﺍﻟﻣﻭﺍﺻﻔﺎﺕ‬ ‫ﺍﻟﻘﻳﺎﺳﻳﺔ ‪ .DVB-C‬ﺑﺎﻻﺿﺎﻓﺔ ﺍﻟﻰ ﺫﻟﻙ ﻓﺎﻧﻙ ﺑﺣﺎﺟﺔ ﺍﻟﻰ ﻧﻅﺎﻡ ﺍﺳﺗﻘﺑﺎﻝ ‪ headend‬ﻟﻠﺑﺙ ﺍﻟﺗﻠﻳﻔﺯﻳﻭﻧﻰ ﺍﻟﺭﻗﻣﻰ. ﻭﻟﻛﻥ ﻫﻝ‬ ‫ﻫﺫﻩ ﻫﻰ ﺍﻟﻁﺭﻳﻘﺔ ﺍﻻﻭﻓﺭ ﻟﻠﻘﻳﺎﻡ ﺑﺫﻟﻙ؟ ﻳﻘﻭﻝ ﺍﻟﺧﺑﺭﺍء ﻟﺩﻯ ﺷﺭﻛﺔ ‪ :Promax‬ﻻ ﻓﺑﺎﻣﻛﺎﻧﻙ ﺍﻥ ﻗﻭﻡ ﺑﺫﻟﻙ ﺑﻁﺭﻗﺔﺍﻭﻓﺭ ﻭﺃﺳﻬﻝ.‬ ‫‪36 TELE-satellite — Global Digital TV Magazine — 12-01/2010 — www.TELE-satellite.com‬‬
  • 2. ‫ﻟﻘﺩ ﻛﺎﻥ ﺍﻟﺭﺟﺎﻝ ﺍﻟﻌﺎﻣﻠﻭﻥ ﺑﺷﺭﻛﺔ‬ ‫ ﺃﺫﻛﻳﺎء ﺣﻳﺙ ﻻﺣﻅﻭﺍ ﺃﻥ‬Promax ‫ﺃﺟﻬﺯﺓ ﺍﻟﺗﻠﻔﺎﺯ ﺍﻟﺣﺩﻳﺛﺔ ﻓﻰ ﺃﺣﻳﺎﻥ ﻛﺛﻳﺭﺓ‬ ‫ ﻻﺳﺗﻘﺑﺎﻝ‬tuner ‫ﻳﺗﻡ ﺗﺯﻭﻳﺩﻫﺎ ﺑﻣﻭﺍﻟﻑ‬ ‫ﺍﻟﺑﺙ ﺍﻟﺗﻠﻔﺯﻳﻭﻧﻰ ﺍﻟﺭﻗﻣﻰ ﺍﻻﺭﺿﻰ‬ analoge ‫ﺑﺟﻭﺍﺭ ﺍﻟﻣﻭﺍﻟﻑ ﺍﻟﺗﻧﺎﻅﺭﻯ‬ ‫ﺍﻟﺗﻘﻠﻳﺩﻯ. ﻭ ﺍﻻﻥ، ﺍﺫﺍ ﻛﺎﻥ ﻣﻥ ﺍﻟﻣﻣﻛﻥ‬ ‫ﺍﺭﺳﺎﻝ ﺍﺷﺎ ﺭﺍﺕ ﺍﻟﺑﺙ ﺍﻟﺗﻠﻔﺯﻳﻭﻧﻰ ﺍﻟﺭﻗﻣﻰ‬ ‫ﺍﻻﺭﺿﻰ ﻋﺑﺭ ﺍﻟﻬﻭﺍء، ﻓﺎﻧﻪ ﻣﻥ ﺍﻟﻣﻣﻛﻥ‬ .‫ﺍﺭﺳﺎﻟﻬﺎ ﻋﺑﺭ ﺷﺑﻛﺔ ﺍﻟﻛﺎﺑﻼﺕ ﺍﻳﺿﺎ‬ ‫ﻓﺟﻬﺎﺯ ﺍﻟﺗﻠﻔﺎﺯ ﻟﺩﻯ ﺍﻟﻣﺳﺗﺧﺩﻡ ﻻ ﻳﺑﺎﻟﻰ‬ ‫ﺍﺫﺍ ﻣﺎ ﻛﺎﻧﺕ ﺍﺷﺎﺭﺓ ﺍﻟﺑﺙ ﺍﻟﺗﻠﻔﺯﻳﻭﻧﻰ‬ ‫ﺍﻟﺭﻗﻣﻰ ﺍﻻﺭﺿﻰ ﻗﺎﺩﻣﺔ ﻣﻥ ﺍﻟﻬﻭﺍﺋﻰ‬ .‫ ﺃﻡ ﻣﻥ ﻧﻅﺎﻡ ﻛﺎﺑﻼﺕ‬aerial ‫ﺇﻥ ﺑﻌﺽ ﺍﻟﻣﺷﺎﻫﺩﻳﻥ ﺳﻳﻛﻭﻥ‬ ‫ﻟﺩﻳﻬﻡ ﻣﻭﺍﻟﻑ ﺑﺙ ﺗﻠﻔﺯﻳﻭﻧﻰ ﺭﻗﻣﻰ‬ ‫ ﺑﺩﺍﺧﻝ‬DVB-T tuner ‫ﺃﺭﺿﻰ‬ ‫ﺃﺟﻬﺯﺓﺍﻟﺗﻠﻔﺯﻳﻭﻥ ﺍﻟﻣﺳﻁﺣﺔ ﺍﻟﺗﻰ‬ ‫ﻟﺩﻳﻬﻡ، ﻭ ﺍﻟﺑﻌﺽ ﺍﻻﺧﺭ ﺳﻳﺳﺗﺧﺩﻡ‬ set-top-box ‫ﺟﻬﺎﺯ ﺍﺳﺗﻘﺑﺎﻝ‬ TELE-satellite World www.TELE-satellite.com/... Download this report in other languages from the Internet: Arabic ‫ﺍﻟﻌﺮﺑﻴﺔ‬ www.TELE-satellite.com/TELE-satellite-1001/ara/promax.pdf Indonesian Indonesia www.TELE-satellite.com/TELE-satellite-1001/bid/promax.pdf Bulgarian Български www.TELE-satellite.com/TELE-satellite-1001/bul/promax.pdf Czech Česky www.TELE-satellite.com/TELE-satellite-1001/ces/promax.pdf German Deutsch www.TELE-satellite.com/TELE-satellite-1001/deu/promax.pdf English English www.TELE-satellite.com/TELE-satellite-1001/eng/promax.pdf Spanish Español www.TELE-satellite.com/TELE-satellite-1001/esp/promax.pdf Farsi ‫ﻓﺎﺭﺳﻲ‬ www.TELE-satellite.com/TELE-satellite-1001/far/promax.pdf French Français www.TELE-satellite.com/TELE-satellite-1001/fra/promax.pdf Hebrew ‫עברית‬ www.TELE-satellite.com/TELE-satellite-1001/heb/promax.pdf Greek Ελληνικά www.TELE-satellite.com/TELE-satellite-1001/hel/promax.pdf Croatian Hrvatski www.TELE-satellite.com/TELE-satellite-1001/hrv/promax.pdf Italian Italiano www.TELE-satellite.com/TELE-satellite-1001/ita/promax.pdf Hungarian Magyar www.TELE-satellite.com/TELE-satellite-1001/mag/promax.pdf Mandarin 中文 www.TELE-satellite.com/TELE-satellite-1001/man/promax.pdf Dutch Nederlands www.TELE-satellite.com/TELE-satellite-1001/ned/promax.pdf Polish Polski www.TELE-satellite.com/TELE-satellite-1001/pol/promax.pdf Portuguese Português www.TELE-satellite.com/TELE-satellite-1001/por/promax.pdf Romanian Românesc www.TELE-satellite.com/TELE-satellite-1001/rom/promax.pdf Russian Русский www.TELE-satellite.com/TELE-satellite-1001/rus/promax.pdf Swedish Svenska www.TELE-satellite.com/TELE-satellite-1001/sve/promax.pdf Turkish Türkçe www.TELE-satellite.com/TELE-satellite-1001/tur/promax.pdf Available online starting from 27 November 2009 www.TELE-satellite.com — 12-01/2010 — TELE-satellite — Global Digital TV Magazine 37
  • 3. ‫ﺇﻥ ﻭﺣﺩﺓ 201-‪ DT‬ﻫﻰ ﺍﻟﻭﺣﺩﺓ‬ ‫ﺍﻟﻭﺣﺩﺓ ﺍﻟﺗﺎﻟﻳﺔ ﺍﻟﻣﻭﺟﻭﺩﺓ ﻟﺩﻳﻧﺎ ﻓﻰ‬ ‫ﺑﺗﺻﻣﻳﻡ ﻧﻅﺎﻡ ﺍﻻﺳﺗﻘﺑﺎﻝ ‪DTTV‬‬ ‫ﻣﻧﻔﺻﻝ ﻻﺳﺗﻘﺑﺎﻝ ﺍﻟﺑﺙ ﺍﻟﺗﻠﻔﺯﻳﻭﻧﻰ‬ ‫ﺍﻟﺗﺎﻟﻳﺔ ﺍﻟﺗﻰ ﻭﺿﻌﻧﺎﻫﺎ ﺑﺟﻭﺍﺭ ﻭﺣﺩﺓ‬ ‫ﺭﻑ ‪ rack‬ﺍﻻﺧﺗﺑﺎﺭ ﻫﻰ 203-‪.DT‬‬ ‫‪.headend‬‬ ‫ﺍﻟﺭﻗﻣﻰ. ﻭ ﻟﻛﻥ ﻳﺑﻘﻰ ﻫﻧﺎﻙ ﺷﺊ ﻭﺍﺣﺩ‬ ‫203-‪ .DT‬ﻓﻭﺣﺩﺓ 201-‪ DT‬ﺗﻘﻭﻡ‬ ‫ﻭ ﻫﻰ ﻭﺣﺩﺓ ﺗﺣﺗﻭﻯ ﻋﻠﻰ ﺟﻬﺎﺯﻯ‬ ‫ﻣﺅﻛﺩ: ﻓﺎﺫﺍ ﻛﺎﻥ ﺑﺎﺳﺗﻁﺎﻋﺗﻬﻡ ﺍﺳﺗﻘﺑﺎﻝ‬ ‫ﺑﺗﺣﻭﻳﻝ ﺍﺷﺎ ﺭﺍﺕ ﺍﻟﺑﺙ ﺍﻟﺭﻗﻣﻰ ﻣﻥ‬ ‫ﺍﺳﺗﻘﺑﺎﻝ ﻓﻰ ﺍﻥ ﻭﺍﺣﺩ ﻟﻛﻰ ﺗﺩﻋﻡ‬ ‫ﻭﺻﻑ ﺃﺟﺯﺍء ﺍﻟﺟﻬﺎﺯ‬ ‫ﺍﺷﺎﺭﺓ ﺍﻟﺑﺙ ﺍﻟﺗﻠﻔﺯﻳﻭﻧﻰ ﺍﻟﺭﻗﻣﻰ‬ ‫ﺍﻟﻧﻭﻉ ‪ transport stream‬ﺍﻟﻰ‬ ‫ﻧﻅﺎﻣﻰ ﺍﻟﺑﺙ ﺍﻟﺗﻠﻔﺯﻳﻭﻧﻰ ﺍﻟﺭﻗﻣﻰ ﻋﺑﺭ‬ ‫ﺍﻻﺭﺿﻰ ﻻﺳﻠﻛﻳﺎ ﻓﺳﻳﻛﻭﻥ ﺑﺎﻣﻛﺎﻧﻬﻡ‬ ‫ﺍﺷﺎ ﺭﺍﺕ ﺑﺙ ﺗﻠﻔﺯﻳﻭﻧﻰ ﺭﻗﻣﻰ ﺍﺭﺿﻰ‬ ‫ﺍﻻﻗﻣﺎﺭ ﺍﻟﺻﻧﺎﻋﻳﺔ 2‪ DVBS/S‬ﻭ‬ ‫ﺇﻥ ﻧﻅﺎﻡ ﺍﻻﺳﺗﻘﺑﺎﻝ ﻗﺩ ﺗﻡ ﺗﺻﻣﻳﻣﻪ‬ ‫ﺍﻳﺿﺎ ﺍﺳﺗﻘﺑﺎﻝ ﺍﻟﺑﺙ ﺍﻟﺗﻠﻔﺯﻳﻭﻧﻰ‬ ‫‪ .DVB-T‬ﻭﺗﻘﺑﻝ ﺃﻯ ﻧﻭﻉ ﻣﻥ ﺍﺷﺎ ﺭﺍﺕ‬ ‫ﻫﺫﻩ ﺍﻟﻭﺣﺩﺓ ﺗﻘﻭﻡ ﺑﺎﺧ ﺭﺍﺝ ﺍﺷﺎ ﺭﺍﺕ ﻣﻥ‬ ‫ﻋﻠﻰ ﻫﻳﺋﺔ ﻭﺣﺩﺍﺕ ﻟﺫﻟﻙ ﻣﻥ ﺍﻟﺳﻬﻝ‬ ‫ﺍﻟﺭﻗﻣﻰ ﻋﺑﺭ ﺍﻟﻛﺎﺑﻼﺕ ﻭ ﻫﺫﺍ ﻓﻘﻁ ﺍﺫﺍ‬ ‫‪ transport stream‬ﻭ ﻟﻛﻥ ﻓﻰ‬ ‫ﺍﻟﻧﻭﻉ ‪ Transport stream‬ﻭﻫﻭ‬ ‫ﺿﺑﻁﻪ ﺗﺑﻌﺎ ﻟﻼﺣﺗﻳﺎﺟﺎﺕ ﺍﻟﻣﺣﺩﺩﺓ.‬ ‫ﻛﺎﻥ ﻧﻅﺎﻡ ﺍﺳﺗﻘﺑﺎﻝ ﺍﻟﻛﺎﺑﻼﺕ ‪cable‬‬ ‫ﺍﺧﺗﺑﺎﺭﻧﺎ ﻫﺫﺍ ﺍﺳﺗﺧﺩﻣﻧﺎ ﺍﻻﺷﺎ ﺭﺍﺕ‬ ‫ﺍﺣﺩ ﺑﺭﻭﺗﻭﻛﻭﻻﺕ ﺍﻟﺑﺙ ﺍﻟﺭﻗﻣﻰ. ﻓﺎﺫﺍ‬ ‫ﻓﻛﻝ ﺷﺊ ﺗﻡ ﻭﺿﻌﻪ ﻓﻰ ﺭﻑ ‪rack‬‬ ‫‪ headend‬ﻳﻘﻭﻡ ﺑﺎﺧ ﺭﺍﺝ ﺍﺷﺎﺭﺓ‬ ‫ﺍﻟﺗﻰ ﻳﻘﻭﻡ ﺑﺎﺧ ﺭﺍﺟﻬﺎ ﺍﻟﻭﺣﺩﺓ ﺍﻟﻣﺟﺎﻭﺭﺓ‬ ‫ﻗﻣﺕ ﺑﺗﻭﺻﻳﻝ ﻭﺣﺩﺗﻰ ‪ LNB‬ﺑﻣﺩﺍﺧﻝ‬ ‫ﻣﺗﻭﺍﻓﻘﺔ ﻣﻊ ﺍﻟﺑﺙ ﺍﻟﺗﻠﻔﺯﻳﻭﻧﻰ ﺍﻟﺭﻗﻣﻰ‬ ‫ﻗﻳﺎﺳﻰ ﻁﻭﻟﻪ 91ﺑﻭﺻﺔ. ﻭﻭﺣﺩﺓ ﺍﻟﺗﺣﻛﻡ‬ ‫ﻟﻪ ﻭ ﻫﻰ ﻭﺣﺩﺓ 203-‪ .DT‬ﻭ ﻳﻭﺟﺩ‬ ‫ﺗﻠﻙ ﺍﻟﻭﺣﺩﺓ، ﻳﻣﻛﻧﻙ ﺍﻋﺩﺍﺩ ﺍﻟﻭﺣﺩﺓ ﺑﺎﻥ‬ ‫ﺍﻻﺭﺿﻰ. ﻭ ﻫﺫﺍ ﻫﻭ ﻣﺎ ﻳﻘﻭﻡ ﺑﻪ ﻧﻅﺎﻡ‬ ‫ﻭ ﻣﺯﻭﺩ ﺍﻟﻁﺎﻗﺔ 008-‪ DT‬ﺗﻡ ﻭﺿﻌﻬﻡ‬ ‫ﺑﻬﺫﻩ ﺍﻟﻭﺣﺩﺓ ﻣﺩﺧﻠﻳﻥ ‪ ASI‬ﻻﺷﺎ ﺭﺍﺕ‬ ‫ﺗﺳﺗﻘﺑﻝ ﻣﺳﺗﺟﻳﺑﻳﻥ ‪transponders‬‬ ‫ﺍﺳﺗﻘﺑﺎﻝ ‪ Promax‬ﻭﻫﻭ ‪Digital To‬‬ ‫ﻓﻰ ﺍﻗﻰ ﺍﻟﻳﺳﺎﺭ. ﻛﻣﺎ ﻳﻭﺟﺩ ﺑﻪ ﺷﺎﺷﺔ‬ ‫‪ transport stream‬ﻭ ﻣﺧﺭﺝ‬ ‫ﻣﺧﺗﻠﻔﻳﻥ. ﺇﻥ ﻛﻝ ﺟﻬﺎﺯ ﺍﺳﺗﻘﺑﺎﻝ‬ ‫‪ ! TV (DTTV) headend‬ﻭ ﻫﺫﺍ‬ ‫ﻋﺭﺽ ‪LCD‬ﺑﻳﺎﻧﻳﺔ ﻭ ﺑﻌﺽ ﺍﻻﺯﺭﺍﺭ‬ ‫ﻟﻼﺷﺎ ﺭﺍﺕ ﺍﻟﻣﺗﻭﺍﻓﻘﺔ ﻣﻊ ﻣﻭﺍﺻﻔﺎﺕ‬ ‫ﺃﻗﻣﺎﺭ ﺻﻧﺎﻋﻳﺔ ﻟﻪ ﻣﺧﺭﺟﻳﻥ‬ ‫ﺍﻟﻧﻅﺎﻡ ﻳﻌﻣﻝ ﺑﺩﻭﻥ ﺍﻟﺣﺎﺟﺔ ﺍﻟﻰ ﺟﻬﺎﺯ‬ ‫ﺍﻟﺑﺙ ﺍﻟﺗﻠﻔﺯﻳﻭﻧﻰ ﺍﻟﺭﻗﻣﻰ ﺍﻻﺭﺿﻰ‬ ‫‪ASI‬ﻣﺗﻣﺎﺛﻠﻳﻥ ﻣﻥ ﺍﻟﻧﻭﻉ ‪Transport‬‬ ‫ﺍﻟﺗﻰ ﺗﺳﺗﺧﺩﻣﻬﺎ ﻟﻠﺗﺣﻛﻡ ﺑﺎﻟﻭﺣﺩﺍﺕ‬ ‫ﺍﺳﺗﻘﺑﺎﻝ ﻟﺩﻯ ﻛﻝ ﻣﺳﺗﺧﺩﻡ.‬ ‫‪ .DVB-T‬ﻓﻬﻧﺎﻙ ﺍﺷﺎﺭﺗﻳﻥ ﺣﺎﻣﻠﺗﻳﻥ‬ ‫‪ .stream‬ﻭ ﺍﻻﺧﺗﺻﺎﺭ ‪ASI‬‬ ‫ﺍﻻﺧﺭﻯ. ﺑﺎﻻﺿﺎﻓﺔ ﺍﻟﻰ ﻫﺫﺍ، ﻳﻭﺟﺩ‬ ‫‪ ) carriers‬ﻭ ﺑﺎﻟﺗﺎﻟﻰ ﻫﻧﺎﻙ ﻣﺑﺎﺩﻟﻳﻥ‬ ‫ﻳﻌﻧﻰ ‪Asynchronous Serial‬‬ ‫ﻭﺻﻠﺔ ‪ Ethernet‬ﻋﻠﻰ ﺍﻟﻠﻭﺣﺔ‬ ‫ﻭ ﻟﺟﻌﻝ ﺷﺑﻛﺔ ﺍﻟﻛﺎﺑﻼﺕ ﺷﺑﻛﺔ‬ ‫‪ (multiplexes‬ﻓﻰ ﺍﻟﻣﺧﺭﺝ ﺍﺫﺍ ﻗﻣﻧﺎ‬ ‫‪ Interface‬ﺃﻭﺍﻟﻭﺍﺟﻬﺔ ﺍﻟﺗﺳﻠﺳﻠﻳﺔ‬ ‫ﺍﻻﻣﺎﻣﻳﺔ. ﻓﺑﻌﺩ ﺗﻭﺻﻳﻝ ﺍﻟﻭﺣﺩﺓ ﺑﺷﺑﻛﺔ‬ ‫ﺷﻳﻘﺔ، ﻓﺎﻧﺕ ﻟﺳﺕ ﺑﺣﺎﺟﺔ ﺍﻟﻰ ﺍﻋﺎﺩﺓ‬ ‫ﺑﺗﻐﺫﻳﺔ ﺍﻟﻭﺣﺩﺓ ﺑﺎﺷﺎﺭﺗﻳﻥ ‪transport‬‬ ‫ﺍﻟﻐﻳﺭ ﻣﺗ ﺯﺍﻣﻧﺔ ﻭ ﻫﻰ ﻁﺭﻳﻘﺔ ﺍﺭﺳﺎﻝ ﻭ‬ ‫ﺍﻟﺣﻭﺍﺳﺏ ﺍﻟﻣﺣﻠﻳﺔ ‪ ،LAN‬ﻳﻣﻛﻧﻙ‬ ‫ﺑﺙ ﻛﻝ ﺍﻻﺷﺎ ﺭﺍﺕ ﺍﻻﺭﺿﻳﺔ ﺍﻟﻣﺗﺎﺣﺔ‬ ‫‪ stream‬ﻣﻧﻔﺻﻠﺗﻳﻥ. ﺍﻟﻭﺣﺩﺓ ﺍﻟﺗﺎﻟﻳﺔ‬ ‫ﻧﻘﻝ ﺍﻻﺷﺎ ﺭﺍﺕ ﺍﻟﺧﺎﺿﻌﺔ ﻟﺑﺭﻭﺗﻭﻛﻭﻻﺕ‬ ‫ﺿﺑﻁ ﻛﻝ ﺍﻻﻋﺩﺍﺩﺍﺕ ﺑﻁﺭﻳﻘﺔ ﺍﺳﻬﻝ‬ ‫ﻋﺑﺭ ﺍﻟﻬﻭﺍء ﻭ ﻟﻛﻧﻙ ﺑﺣﺎﺟﺔ ﺍﻟﻰ ﺍﺿﺎﻓﺔ‬ ‫ﻫﻰ ﻭﺣﺩﺓ 202-‪ ،DT‬ﻭ ﺗﺣﺗﻭﻯ ﻋﻠﻰ‬ ‫ﺍﻟﺑﺙ ﺍﻟﺭﻗﻣﻰ ‪.transport stream‬‬ ‫ﺩﺍﺧﻝ ﺍﺣﺩ ﺍﻟﺗﻁﺑﻳﻘﺎﺕ ﻋﻠﻰ ﺟﻬﺎﺯ‬ ‫ﻣﺣﺗﻭﻯ ﻣﻥ ﺍﻟﻣﺣﺗﻭﻳﺎﺕ ﺍﻟﺗﻰ ﺗﺑﺙ‬ ‫ﻣﺣﻭﻝ ‪ transmodulator‬ﺛﻧﺎﺋﻰ‬ ‫ﻓﻭﺣﺩﺓ 203-‪ DT‬ﺗﻣﻛﻧﻧﺎ ﻣﻥ ﺍﺧﺗﻳﺎﺭ‬ ‫ﺍﻟﺣﺎﺳﺏ ﺍﻟﺷﺧﺻﻰ ‪ .PC‬ﻭ ﻋﻠﻰ‬ ‫ﻋﺑﺭ ﺍﻻﻗﻣﺎﺭ ﺍﻟﺻﻧﺎﻋﻳﺔ. ﻭ ﻓﻰ ﻛﺛﻳﺭ‬ ‫ﻟﻠﺗﺣﻭﻳﻝ ﻣﻥ ﻧﻅﺎﻡ ﺍﻟﺑﺙ ﺍﻟﺗﻠﻔﺯﻳﻭﻧﻰ‬ ‫ﺍﻟﺑ ﺭﺍﻣﺞ ﺍﻟﺗﻰ ﻧﺭﻳﺩ ﺍﻣ ﺭﺍﺭﻫﺎ. ﻭ ﺑﺎﻟﺗﺎﻟﻰ‬ ‫ﺍﻟﻠﻭﺣﺔ ﺍﻟﺧﻠﻔﻳﺔ ﻧﺟﺩ ﻣﻘﺑﺱ ﺍﻟﻁﺎﻗﺔ ﻭ‬ ‫ﻣﻥ ﺍﻻﺣﻳﺎﻥ ﻗﺩ ﺗﺣﺏ ﺍﺫﺍﻋﺔ ﺑﻌﺽ‬ ‫ﺍﻟﺭﻗﻣﻰ ﻋﺑﺭ ﺍﻟﻘﻣﺭ ﺍﻟﺻﻧﺎﻋﻰ ﺍﻟﻰ‬ ‫ﻓﻼ ﺣﺎﺟﺔ ﻟﻧﺎ ﺑﺎﻥ ﻧﻘﻭﻡ ﺑﺎﻋﺎﺩﺓ ﺍﺭﺳﺎﻝ‬ ‫ﺯﺭ ﺍﻟﺗﺷﻐﻳﻝ ﻭ ﻗﻁﺎﻉ ﺃﻧﺎﺑﻳﺏ ﺍﻟﺟﻬﺩ‬ ‫ﺍﻟﻣﺣﺗﻭﻳﺎﺕ ﻣﻥ ﺍﻟﻣﺻﺎﺩﺭ ﺍﻟﺳﻣﻌﻳﺔ‬ ‫ﻧﻅﺎﻡ ﺍﻟﺑﺙ ﺍﻻﺭﺿﻰ ‪ .DVB-T‬ﻭ ﻫﺫﻩ‬ ‫ﻛﻝ ﻗﻧﺎﺓ ﻣﻥ ﻣﺳﺗﺟﻳﺏ ‪transponder‬‬ ‫ﺍﻟﻛﺭﺑﻰ ﻭ ﻣﻘﺎﺑﺱ ﻣﻥ ﺍﺟﻝ ﻛﺎﺑﻼﺕ‬ ‫ﺍﻭ ﺍﻟﺑﺻﺭﻳﺔ ‪ .A/V sources‬ﻓﻌﻠﻰ‬ ‫ﺍﻟﻭﺣﺩﺍﺕ ﺗﻘﺩﻡ ﺍﻟﺣﻝ ﺍﻷﺑﺳﻁ ﻭ ﺍﻷﻗﻝ‬ ‫ﻣﻌﻳﻥ ﻭ ﻟﻛﻥ ﻓﻘﻁ ﺍﻟﻘﻧﻭﺍﺕ ﺍﻟﺗﻰ ﻧﺭﻳﺩ‬ ‫ﺍﻟﺗﺣﻛﻡ ﻭ ﻣﺭﻭﺣﺔ ﺗﺑﺭﻳﺩ. ﻭ ﻫﺫﺍ ﻫﻭ‬ ‫ﺳﺑﻳﻝ ﺍﻟﻣﺛﺎﻝ، ﺗﻘﻭﻡ ﺍﻟﻔﻧﺎﺩﻕ ﺑﻌﺭﺽ‬ ‫ﺗﻛﻠﻔﺔ ﻟﺗﻭﺯﻳﻊ ﺍﻟﻘﻧﻭﺍﺕ ﺍﻟﻔﺿﺎﺋﻳﺔ ﺍﻟﺗﻰ‬ ‫ﺃﻥ ﻧﻌﺭﺿﻬﺎ ﻟﻠﻣﺷﺗﺭﻛﻳﻥ. ﻭ ﻣﻥ ﺍﻟﻣﺛﻳﺭ‬ ‫ﺑﺎﻟﻔﻌﻝ ﺍﻟﻣﻭﺟﻭﺩ ﺑﺄﻧﻅﻣﺔ ﺍﻻﺳﺗﻘﺑﺎﻝ‬ ‫ﺑﻌﺽ ﺍﻟﻣﻌﻠﻭﻣﺎﺕ ﺑﺻﻭﺭﺓ ﺩﻭﺭﻳﺔ ﻣﻥ‬ ‫ﺗﺑﺙ ﻋﺑﺭ ﺍﻟﻬﻭﺍء ‪ FTA‬ﻭ ﺍﻟﺗﻰ ﻻ ﺗﺣﺗﺎﺝ‬ ‫ﺑﻭﺭﺓ ﺧﺎﺻﺔ ﻓﻰ ﻫﺫﻩ ﺍﻟﻭﺣﺩﺓ ﻫﻭ‬ ‫‪ headends‬ﺍﻟﻣﺣﺗﺭﻓﺔ. ﺇﻥ ﻣ ﺭﺍﻭﺡ‬ ‫ﺃﺟﻝ ﺯﺍﺋﺭﻳﻬﺎ. ﻭ ﻓﻰ ﺍﻟﻧﻬﺎﻳﺔ، ﻻ ﻳﻣﻛﻧﻙ‬ ‫ﺍﺳﺗﺧﺩﺍﻡ ﺍﻯ ﻣﻥ ﺍﻟﻛﺭﻭﺕ ﺍﻟﺫﻛﻳﺔ.‬ ‫ﻭﺣﺩﺗﻰ ﺍﻻﺳﺗﺧﺩﺍﻡ ﺍﻟﻣﺷﺭﻭﻁ ‪CAM‬‬ ‫ﺍﻟﺗﺑﺭﻳﺩ ﺗﺻﺩﺭ ﺑﻌﺽ ﺍﻟﺿﺟﻳﺞ ﻭ ﻟﻛﻥ‬ ‫ﺍﻥ ﺗﻧﺳﻰ ﺷﺑﻛﺔ ﺍﻻﻧﺗﺭﻧﺕ ﻭ ﺍﻟﺑﺙ‬ ‫ﺍﻟﻣﻭﺟﻭﺩﻳﻥ ﺗﺣﺕ ﺍﻟﻐﻁﺎء ﺍﻟﻌﻠﻭﻯ.‬ ‫ﺩﺍﺋﻣﺎ ﻣﺎ ﻻ ﻳﺗﻡ ﻭﺿﻊ ﻫﺫﻩ ﺍﻻﺷﻳﺎء ﻓﻰ‬ ‫ﺍﻟﺗﻠﻔﺯﻳﻭﻧﻰ ﻋﺑﺭ ﺷﺑﻛﺔ ﺍﻻﻧﺗﺭﻧﺕ ﺃﻭ‬ ‫ﻭ ﻛﻣﺎ ﺗﺭﻯ ﻓﻰ ﺍﻟﺻﻭﺭﺓ، ﻓﻭﺣﺩﺓ‬ ‫ﻓﻌﻧﺩ ﺍﺩﺧﺎﻝ ﻛﺎﺭﺕ ﺫﻛﻰ ‪smart‬‬ ‫ﺍﻟﻐﺭﻓﺔ ﺍﻟﺗﻰ ﻣﻥ ﺍﻟﻣﺗﻭﻗﻊ ﺃﻥ ﻳﻌﻣﻝ ﺑﻬﺎ‬ ‫ﻣﺎ ﻳﻌﺭﻑ ﺑﻣﺻﻁﻠﺢ )‪ .(IPTV‬ﻟﻣﺎﺫﺍ‬ ‫405-‪ DT‬ﻫﻰ ﺍﺗﺎﻟﻳﺔ. ﻭ ﺑﻬﺎ 4‬ ‫‪ card‬ﺻﺎﻟﺢ ﺍﻻﺳﺗﺧﺩﺍﻡ ، ﻓﺳﻳﻣﻛﻧﻙ‬ ‫ﺍﻷﺷﺧﺎﺹ ﻟﺳﺎﻋﺎﺕ. ﻭ ﻳﺗﻡ ﺗﻭﺻﻳﻝ‬ ‫ﻻ ﺗﺟﻌﻠﻪ ﻫﻭ ﺃﻳﺿﺎ ﻣﺗﺎﺣﺎ ﻟﻣﺷﺗﺭﻛﻰ‬ ‫ﻣﺩﺍﺧﻝ ﻟﻠﺻﻭﺕ ﻭ ﺍﻟﺻﻭﺭﺓ ﻭ ﻫﻰ‬ ‫ﻓﻙ ﺗﺷﻔﻳﺭ ﺍﻟﻘﻧﻭﺍﺕ ﺍﻟﻔﺿﺎﺋﻳﺔ! ﻭ‬ ‫ﻭﺣﺩﺓ ﺍﻟﺗﺣﻛﻡ ﻭ ﻣﺯﻭﺩ ﺍﻟﻁﺎﻗﺔ -‪DT‬‬ ‫ﺷﺑﻛﺔ ﻛﺎﺑﻼﺕ ﺍﻟﺑﺙ ﺍﻟﻠﻔﺯﻳﻭﻧﻰ؟ ﺇﻥ‬ ‫ﻣﺄﻟﻭﻓﺔ ﻟﺩﻯ ﻛﻝ ﻗ ﺭﺍﺋﻧﺎ. ﻧﻌﻡ، ﻫﺫﻩ ﻫﻰ‬ ‫ﺑﻬﺫﻩ ﺍﻟﻁﺭﻳﻘﺔ ﻳﻣﻛﻥ ﺗﺯﻭﻳﺩ ﺷﺑﻛﺔ‬ ‫008 ﺑﺟﻣﻳﻊ ﺍﻟﻭﺣﺩﺍﺕ ﺍﻻﺧﺭﻯ ﺑﻭﺍﺳﻁﺔ‬ ‫ﻛﻝ ﺍﻻﻣﻧﻳﺎﺕ ﺍﻟﺳﺎﺑﻘﺔ ﻫﻰ ﻓﻰ ﺍﻟﺣﻘﻳﻘﺔ‬ ‫ﻣﺩﺍﺧﻝ ﺍﻟﺻﻭﺕ ﻭ ﺍﻟﺻﻭﺭﺓ ﺍﻟﺗﻧﺎﻅﺭﻳﺔ‬ ‫ﻛﺎﺑﻼﺕ ﺍﻟﺗﻠﻔﺯﻳﻭﻥ ﺑﺎﻟﻘﻧﻭﺍﺕ ﺍﻟﻔﺿﺎﺋﻳﺔ‬ ‫ﻛﺎﺑﻼﺕ ﻣﺗﻌﺩﺩﺓ ﺍﻻﺳﻼﻙ. ﻛﻣﺎ ﻳﻣﻛﻧﻬﺎ‬ ‫ﺍﻟﻣﺗﻁﻠﺑﺎﺕ ﺍﻟﺗﻰ ﺃﺧﺫﻫﺎ ﻣﻬﻧﺩﺳﻭ ﺷﺭﻛﺔ‬ ‫‪ Analog‬ﺍﻟﻣﻌﺗﺎﺩﺓ. ﺣﻳﺙ ﻳﻣﻛﻥ‬ ‫ﺍﻻﺻﻠﻳﺔ.‬ ‫ﺍﻟﺗﺣﻛﻡ ﺑﻣﺎ ﻳﺻﻝ ﺍﻟﻰ 7 ﻭﺣﺩﺍﺕ.‬ ‫‪ Promax‬ﻓﻰ ﺍﻋﺗﺑﺎﺭﻫﻡ ﻋﻧﺩﻣﺎ ﻗﺎﻣﻭﺍ‬ ‫‪38 TELE-satellite — Global Digital TV Magazine — 12-01/2010 — www.TELE-satellite.com‬‬
  • 4. ‫‪ Combiner/Amplifier‬ﻭ ﺍﻟﺗﻰ ﺗﺄﺧﺫ‬ ‫ﺍﺩﺧﺎﻝ ﺍﻻﺷﺎ ﺭﺍﺕ ﺍﻟﻘﺎﺩﻣﺔ ﻣﻥ ﻣﺷﻐﻝ‬ ‫ﺣﺗﻰ 8 ﺍﺷﺎ ﺭﺍﺕ ﺑﺙ ﺗﻠﻳﻔﺯﻳﻭﻧﻰ ﺭﻗﻣﻰ‬ ‫ﺍﻗ ﺭﺍﺹ ‪ DVD‬ﺍﻭ ﻣﺳﺟﻝ ﺷ ﺭﺍﺋﻁ ﻓﻳﺩﻳﻭ‬ ‫ﺃﺭﺿﻰ ‪ DVB-T‬ﺣﺎﻣﻠﺔ ‪carriers‬‬ ‫‪ VCR‬ﺃﻭ ﻣﻥ ﺟﻬﺎﺯ ﺍﺳﺗﻘﺑﺎﻝ ﺃﻗﻣﺎﺭ‬ ‫ﻭﺗﻘﻭﻡ ﺑﺎﺧ ﺭﺍﺟﻬﻡ ﻛﻠﻬﻡ ﻓﻰ ﻛﺎﺑﻝ ﻭﺍﺣﺩ. ﻭ‬ ‫ﺻﻧﺎﻋﻳﺔ ﺃﻭ ﻣﻥ ﻛﺎﻣﻳ ﺭﺍ ﻣ ﺭﺍﻗﺑﺔ ﺍﻣﻧﻳﺔ ﺃﻭ‬ ‫ﻫﺫﺍ ﺳﻳﻛﻭﻥ ﺑﻁﺑﻳﻌﺔ ﺍﻻﻣﺭ ﻛﺎﺑﻝ ﺍﺧ ﺭﺍﺝ‬ ‫ﻣﻥ ﺍﻯ ﻣﺻﺩﺭ ﺍﺧﺭ. ﺣﻳﺙ ﻳﺗﻡ ﺗﺣﻭﻳﻝ‬ ‫ﻟﺗﻐﺫﻳﺔ ﺍﻟﺷﺑﻛﺔ ﺑﻛﺎﻣﻠﻬﺎ.‬ ‫ﻛﻝ ﻭﺍﺣﺩ ﻣﻥ ﻫﺫﻩ ﺍﻟﻣﺩﺧﻼﺕ ﺍﻟﯩﻘﻧﺎﺓ‬ ‫ﺭﻗﻣﻳﺔ ﻣﻧﻔﺻﻠﺔ ﻋﻧﺩ ﻣﺧﺭﺝ ﻫﺫﻩ ﺍﻟﻭﺣﺩﺓ‬ ‫ﺍﻟﺗﺭﻛﻳﺏ‬ ‫405-‪ .DT‬ﻭ ﺑﻬﺫﻩ ﺍﻟﻁﺭﻳﻘﺔ، ﺗﺣﺻﻝ‬ ‫ﻋﻠﻰ ﺍﺷﺎﺭﺓ ﺣﺣﺎﻣﻠﺔ ‪ carrier‬ﺗﺣﺗﻭﻯ‬ ‫ﻭ ﺑﻣﺟﺭﺩ ﺗﺭﻛﻳﺏ ﻛﻝ ﻭﺣﺩﺓ ﻭ ﺗﻭﺻﻳﻠﻬﻡ‬ ‫ﻋﻠﻰ ﺃﺭﺑﻊ ﻗﻧﻭﺍﺕ.‬ ‫ﻋﻠﻰ ﺍﻟﻠﻭﺣﺔ ﺍﻟﺧﻠﻔﻳﺔ ﺑﻛﺎﺑﻼﺕ ﺍﻟﺗﺣﻛﻡ ﻭ‬ ‫ﺍﻟﻭﺣﺩﺓ ﺍﻻﺧﻳﺭﺓ ﺍﻟﻭﺍﺣﺩﺓ ﻫﻰ -‪ DT‬ﺍﻻﺷﺎﺭﺓ، ﻓﺎﻥ ﺟﻬﺎﺯ ﺍﻟﺗﺣﻭﻳﻝ ‪DTTV‬‬ ‫212، ﻭ ﻫﻰ ﻋﺑﺎﺭﺓ ﻋﻥ ﻭﺣﺩﺓ ﺗﺣﻭﻳﻝ ﻳﻛﻭﻥ ﺟﺎﻫﺯ ﻟﻼﻋﺩﺍﺩ. ﻭ ﺑﺎﻟﺭﻏﻡ ﻣﻥ ﺃﻥ‬ ‫ﻛﻣﺎ ﺗﻘﻭﻡ ﻭﺣﺩﺓ ﺍﻟـ 201-‪ DT‬ﺑﺗﺣﻭﻳﻝ ﺍﺷﺎﺭﺗﻳﻥ ‪ transport stream‬ﺍﻟﻰ ﺍﺷﺎﺭﺗﻳﻥ ﺑﺙ ■ ﻭ ﺗﺿﻣﻳﻥ ‪ transmodulator‬ﻟﻠﺑﺙ ﻋﺩﺩ ﺍﻻﺯﺭﺍﺭ ﻣﺣﺩﻭﺩ ﺑﺳﺗﺔ ﺃﺯﺭﺍﺭ ﻓﻘﻁ:‬ ‫ﺍﻟﺗﻠﻳﻔﺯﻳﻭﻧﻰ ﺍﻟﺭﻗﻣﻰ ﺍﻻﺭﺿﻰ-‪ DVB‬ﺃﺭﺑﻌﺔ ﺃﺳﻬﻡ ﻭ ﺯﺭ ﺍﺩﺧﺎﻝ ‪ ENTER‬ﻭ‬ ‫ﺭﻗﻣﻰ ﺍﺭﺿﻰ ‪ DVB-T‬ﺍﻟﻣﻌﺗﺎﺩ ﻭ ﻣﺗﺩﺍﺧﻠﺗﻳﻥ ﺃﻭ ‪ multiplexed‬ﺑﺗﻘﻧﻳﺔ ﺍﻟـ ‪.COFDM‬‬ ‫ﻭﻳﻣﻛﻧﻙ ﻣﺷﺎﻫﺩﺓ ﺍﻟﻁﻳﻑ ﺍﻟﺗﺭﺩﺩﻯ ‪ spectrum‬ﻟﻬﻡ ﻓﻰ ﺍﻟﺻﻭﺭﺓ ﺍﻟﻣﻭﺿﺣﺔ. ﻟﻘﺩ ﻗﻣﻧﺎ ﺑﺟﻌﻝ‬ ‫ﺯﺭ ﺧﺭﻭﺝ ‪ ،ESC‬ﺇﻻ ﺃﻥ ﻋﻣﻠﻳﺔ ﺍﻋﺩﺍﺩ‬ ‫‪ .T‬ﻓﺑﻌﺩ ﺍﺳﺗﻘﺑﺎﻝ ﺍﺷﺎﺭﺓ ﺭﻗﻣﻳﺔ ﺍﺭﺿﻳﺔ‬ ‫ﺃﺣﺩ ﻣﺳﺗﻭﻳﺎﺗﻬﻡ ﺃﻗﻝ ﺑـ 02 ﺩﻳﺳﺑﻝ. ﻫﺫﺍ ﻭ ﺇﻻ ﺳﻳﻛﻭﻧﻭﺍ ﺑﻧﻔﺱ ﺍﻟﻘﻭﺓ.‬ ‫ﻳﻣﻛﻥ ﺗﻐﻳﻳﺭ ﺗﺭﺩﺩﻫﺎ ﺍﻟﻰ ﺗﺭﺩﺩ ﺍﺧﺭ. ﺍﻟﺟﻬﺎﺯ ﺳﻬﻠﺔ ﺑﺻﻭﺭﺓ ﻣﺩﻫﺷﺔ. ﻓﺑﻣﺟﺭﺩ‬ ‫ﻭ ﻳﺗﻡ ﻫﺫﺍ ﻟﻣﻧﻊ ﺑﻌﺽ ﺍﻟﺗﺩﺍﺧﻼﺕ ﺗﺯﻭﻳﺩ ﺍﻟﺟﻬﺎﺯﺑﺎﻟﻁﺎﻗﺔ ﻭ ﺗﺷﻐﻳﻠﻪ، ﺗﻘﻭﻡ‬ ‫ﺍﻟﻐﻳﺭ ﻣﺭﻏﻭﺏ ﻓﻳﻬﺎ ﺑﻳﻥ ﺍﻻﺷﺎ ﺭﺍﺕ ﻭﺣﺩﺓ ﺍﻟﺗﺣﻛﻡ 008-‪ DT‬ﺑﺎﻟﺗﻌﺭﻑ ﻋﻠﻰ‬ ‫ﺩﺍﺧﻝ ﺍﻟﺷﺑﻛﺔ. ﻭﻣﻥ ﺍﺣﺩ ﺍﻟﻭﻅﺎﺋﻑ ﺍﻟﻭﺣﺩﺍﺕ ﺍﻻﺧﺭﻯ ﺍﻟﻣﺗﺻﻠﺔ ﺑﻬﺎ. ﻭ ﺑﻌﺩ‬ ‫ﺍﻟﻬﺎﻣﺔ ﻟﻬﺫﻩ ﺍﻟﻭﺣﺩﺓ ﻫﻰ ﺗﺣﺳﻳﻥ ﺟﻭﺩﺓ ﺛﻭﺍﻧﻰ ﻗﻠﻳﻠﺔ، ﻳﻣﻛﻧﻧﺎ ﺍﻟﺿﻐﻁ ﻋﻠﻰ ﺯﺭ‬ ‫ﺍﻻﺷﺎﺭﺓ. ﺣﻳﺙ ﺗﻘﻭﻡ ﺑﺎﺯﺍﻟﺔ ﺗﺿﻣﻳﻥ ﺍﻟﺩﺧﻭﻝ ‪ .ENTER‬ﻭ ﺑﻌﺩ ﺫﻟﻙ ﺳﻳﺗﻡ‬ ‫ﺗﻘﻭﻡ ﺳﺅﺍﻟﻙ ﻋﻥ ﻛﻠﻣﺔ ﺍﻟﺳﺭ )‪ ،(PIN‬ﻭ‬ ‫ﻭ‬ ‫‪demodulate‬ﺍﻻﺷﺎﺭﺓ‬ ‫ﺑﻌﺩﻫﺎ ﺗﺧﺗﺎﺭ ﺍﻟﻭﺣﺩﺓ ﺍﻟﺗﯩﺗﺭﻳﺩ ﺃﻥ ﺗﻘﻭﻡ‬ ‫ﺑﺗﺻﺣﻳﺢ ﺍﻟﺑﻳﺕ ‪ bits‬ﺍﻟﺧﺎﻁﺋﺔ ﺛﻡ ﺗﻌﻳﺩ‬ ‫ﺗﺿﻣﻳﻧﻬﺎ ‪ re-modulate‬ﻣﺭﺓ ﺃﺧﺭﻯ ﺑﺿﺑﻁﻬﺎ ) ﻭﻫﺫﺍ ﻋﻥ ﻁﺭﻳﻕ ﺍﻟﺳﻬﻣﻳﻥ‬ ‫ﻛﺎﺷﺎﺭﺓ ﺑﺙ ﺭﻗﻣﻰ ﺍﺭﺿﻰ ‪ .DVB-T‬ﻭ ﺍﻟﺫﺍﻥ ﻳﺷﻳ ﺭﺍﻥ ﺍﻟﻰ ﺍﻟﻳﻣﻳﻥ ﻭ ﺍﻟﻳﺳﺎﺭ(.‬ ‫ﻛﻧﺗﻳﺟﺔ ﻟﻬﺫﺍ، ﻧﺣﺻﻝ ﻋﻠﻰ ﺍﺷﺎﺭﺓ ﺫﺍﺕ ﻭﻋﻧﺩﻣﺎ ﻳﺗﻡ ﻋﺭﺽ ﺍﻟﻭﺣﺩﺓ ﺍﻟﻣﻁﻠﻭﺑﺔ‬ ‫ﻧﺳﺑﺔ ‪ (C/N (Carrier to Noise‬ﺳﻳﻣﻛﻧﻙ ﺯﺭ ﺍﻟﺩﺧﻭﻝ ‪ ENTER‬ﻣﻥ‬ ‫ﺟﻳﺩﺓ ﺟﺩﺍ ﻣﻧﺎﺳﺑﺔ ﺣﺗﻰ ﻟﺷﺑﻛﺔ ﻛﺑﻳﺭﺓ ﺍﻟﺑﺩء ﻓﻰ ﺍﻋﺩﺍﺩ ﺍﻟﻣﺗﻐﻳ ﺭﺍﺕ ﺍﻟﻣﺗﻌﻠﻘﺔ ﺑﻬﺫﻩ‬ ‫ﺍﻟﻭﺣﺩﺓ. ﻭ ﺍﻟﺳﻬﻣﺎﻥ ﺍﻟﺫﺍﻥ ﻳﺷﻳ ﺭﺍﻥ ﺍﻟﻰ‬ ‫ﻣﻥ ﺍﻟﻛﺎﺑﻼﺕ.‬ ‫ﻭ ﺣﺗﻰ ﺑﻌﺩ ﺗﻘﻠﻳﻠﻬﺎ ﺑﻣﻘﺩﺍﺭ 02 ﺩﻳﺳﻳﺑﻝ ﻻ ﺗﺯﺍﻝ ﺍﺷﺎﺭﺓ ﺍﻟﺑﺙ ■‬ ‫ﺃﻋﻠﻰ ﻭ ﺃﺳﻔﻝ ﻳﻘﻭﻣﺎﻥ ﺑﺗﻐﻳﻳﺭ ﻗﻳﻣﺔ ﺍﻟﺭﻗﻡ‬ ‫ﺫﺍﺕ ﺟﻭﺩﺓ ﻋﺎﻟﻳﺔ. ﻻﺣﻅ ﻗﺭﺍءﺍﺕ ﻛﻝ ﻣﻥ ‪ DVB-T‬ﺍﻟﺭﻗﻣﻰ ﺍﻻﺭﺿﻰ‬ ‫ﻭ ﻓﻰ ﺍﻟﻧﻬﺎﻳﺔ، ﺍﻟﻭﺣﺩﺓ ﺍﻟﻣﻭﺟﻭﺩﺓ ﺃﻭ ﺍﻟﺣﺭﻑ ﺍﻷﺑﺟﺩﻯ ﻓﻳﻣﺎ ﻳﻘﻭﻡ ﺍﻟﺳﻬﻣﺎﻥ‬ ‫ﻭ ﻣﻌﺩﻝ ﺍﻟﺧﻁﺄ ﺑﻌﺩ ﺗﺻﺣﻳﺢ ﻓﻳﺗﻳﺭﺑﻰ ‪ CBER‬ﻣﻌﺩﻝ ﺧﻁﺄ ﺍﻟﻘﻧﺎﺓ‬ ‫ﻭ ﻣﻌﺩﻝ ﺧﻁﺄ ‪ C/N‬ﻭ ﻧﺳﺑﺔ ﺍﻻﺷﺎﺭﺓ ﺍﻟﻰ ﺍﻟﺗﺷﻭﻳﺵ ‪VBER‬‬ ‫ﺍﻟﻳﻣﻳﻥ ﻭ ﺍﻟﻳﺳﺎﺭ ﺑﺗﻐﻳﻳﺭ ﺍﻟﻣﻭﺿﻊ ﺩﺍﺧﻝ‬ ‫ﻓﻰ ﺃﻗﺻﻰ ﺍﻟﻳﻣﻳﻥ ﻫﻰ ﻭﺣﺩﺓ -‪DT‬‬ ‫.‪ MER‬ﺍﻟﺗﺿﻣﻳﻥ‬ ‫ﺍﻟﻌﺩﺩ ﺃﻭ ﺍﻻﺳﻡ. ﻭﻛﻝ ﺷﺊ ﻳﻌﻣﻝ ﺑﺎﻟﺣﺩﺱ‬ ‫017. ﻭ ﻫﻰ ﻋﺑﺎﺭﺓ ﻋﻥ ﺩﺍﻣﺞ ﻭ ﻣﻛﺑﺭ‬ ‫ﻭ ﻟﻘﺩ ﺗﻡ ﺍﻋﺎﺩﺓ ﺗﺿﻣﻳﻥ ‪ remodulate‬ﻗﻧﺎﺓ 4 ‪ ■FUN.tv‬ﻭ ﺑﺗﻠﻘﺎﺋﻳﺔ. ﻭ ﻋﻧﺩﻣﺎ ﺗﻘﻭﻡ ﺑﺎﻋﺩﺍﺩ ﺍﻟﻭﺣﺩﺓ‬ ‫ﻣﻥ ﺍﻟﻘﻣﺭ ﺍﻟﺻﻧﺎﻋﻰ ‪ HOTBIRD‬ﻋﻧﺩ 31 ﺩﺭﺟﺔ ﺷﺭﻗﺎ ﺍﻟﻰ 203-‪ DT‬ﻓﺳﺗﺣﺗﺎﺝ ﺍﻟﻰ ﺗﺯﻭﻳﺩﻫﺎ‬ ‫ﺑﻣﻌﻠﻭﻣﺎﺕ ﻛﺗﻠﻙ ﺍﻟﻣﻭﺟﻭﺩﺓ ﻓﻰ ﻗﻭﺍﺋﻡ‬ ‫ﻧﻅﺎﻡ ﺍﻟﺑﺙ ﺍﻟﺗﻠﻔﺯﻳﻭﻧﻰ ﺍﻟﺭﻗﻣﻰ ﺍﻻﺭﺿﻰ ‪ DVB-T‬ﻭ ﺗﻣﺕ‬ ‫ﻣﺷﺎﻫﺩﺗﻬﺎ ﻋﻠﻰ ﺷﺎﺷﺔ ﺟﻬﺎﺯ ﺗﺣﻠﻳﻝ ﺍﻻﺷﺎﺭﺍﺕ ‪signal‬‬ ‫ﺍﻻﻋﺩﺍﺩﺍﺕ ﺍﻟﺧﺎﺻﺔ ﺑﺎﺟﻬﺯﺓ ﺍﻻﺳﺗﻘﺑﺎﻝ‬ ‫‪.analyzer‬‬ ‫ﻣﺛﻝ: ﺗﺭﺩﺩ ﺍﻟﻣﺫﺑﺫﺏ ﺍﻟﻣﺣﻠﻰ ‪ ،LOF‬ﻭ‬ ‫ﺗﺭﺩﺩ ﺍﻟﻣﺳﺗﺟﻳﺏ ﺃﻭ ﺍﻟـ ‪transponder‬‬ ‫ﺍﻟﻣﻁﻠﻭﺏ، ﻭ ﺍﻟﻣﺩﻯ ﺍﻟﺗﺭﺩﺩﻯ )‪،(C/Ku‬‬ ‫ﻭ ﻣﺯﻭﺩ ﺍﻟﻁﺎﻗﺔ ﺍﻟﻛﻬﺭﺑﻳﺔ ﻟﻭﺣﺩﺓ ﺍﻟـ‬ ‫81/31( ‪ LNB‬ﻓﻭﻟﺕ، 0/22 ﻫﺭﺗﺯ(،‬ ‫ﻭ ﻧﻭﻉ ﺍﻟﻧﻅﺎﻡ ﺍﻟﺫﻯ ﺳﻳﺗﻡ ﺍﻟﺗﻌﺎﻣﻝ ﻣﻌﻪ‬ ‫)2‪ ،(DVB-S/S‬ﻭ ﻣﻌﺩﻝ ﺍﻟﺗﺭﻣﻳﺯ‬ ‫‪ .symbol rate‬ﻛﻣﺎ ﻳﻭﺟﺩ ﻫﻧﺎﻙ‬ ‫ﺍﺧﺗﻳﺎﺭ ﺍﺧﺭ ﻭﻫﻭ: ﻗﺎﺋﻣﺔ ﺍﻟﺧﺩﻣﺔ ﺃﻭ‬ ‫‪ .service list‬ﻓﺑﻣﺟﺭﺩ ﺍﻥ ﺗﻘﻭﻡ ﺍﻟﻭﺣﺩﺓ‬ ‫203-‪ DT‬ﺑﺎﻟﺗﻌﺭﻑ ﻋﻠﻰ ﺍﻟﻣﺳﺗﺟﻳﺏ ﺃﻭ‬ ‫ﺍﻟـ ‪ transponder‬ﻓﺳﺗﻘﻭﻡ ﺗﻠﻙ ﺍﻟﻘﺎﺋﻣﺔ‬ ‫ﺍﻟﻔﺭﻋﻳﺔ ﺑﻌﺭﺽ ﻛﻝ ﺍﻟﺧﺩﻣﺎﺕ ﺍﻟﺗﻰ‬ ‫ﺗﻡ ﺍﻟﺗﻌﺭﻑ ﻋﻠﻳﻬﺎ )ﻗﻧﻭﺍﺕ ﺗﻠﻔﺯﻳﻭﻧﻳﺔ،‬ ‫ﻭ ﻗﻧﻭﺍﺕ ﺍﺫﺍﻋﻳﺔ، ﻭ ﻗﻧﻭﺍﺕ ﺍﻟﺑﻳﺎﻧﺎﺕ(.‬ ‫ﻭﻋﻧﺩﺋﺫ ﻳﻛﻭﻥ ﺑﺎﻣﻛﺎﻧﻙ ﺍﺧﺗﻳﺎﺭ ﺗﻠﻙ‬ ‫ﺍﻟﺧﺩﻣﺎﺕ ﻓﻘﻁ ﺍﻟﺗﻰ ﺗﺭﻏﺏ ﺑﺎﺿﺎﻓﺗﻬﺎ ﻓﻰ‬ ‫ﺍﻟﺧﺭﺝ ﺍﻟﺫﻯ ﺗﺣﺻﻝ ﻋﻠﻳﻪ ﻣﻥ ﺍﻟﻭﺣﺩﺓ.‬ ‫ﺇﻥ ﺑﺎﻗﻰ ﺍﻟﺧﺩﻣﺎﺕ ﺳﻭﻑ ﺗﻛﻭﻥ ﻏﻳﺭ‬ ‫ﻣﺗﺎﺣﺔ. ﺇﺫﺍ ﻛﺎﻧﺕ ﺍﻟﺧﺩﻣﺎﺕ ﻣﺷﻔﺭﺓ،‬ ‫ﻓﺑﺎﻣﻛﺎﻧﻙ ﺍﺳﺗﺧﺩﺍﻡ ﻛﺎﺭﺕ ﺫﻛﻰ ‪smart‬‬ ‫‪ card‬ﻭ ﺍﺩﺧﺎﻟﻪ ﻓﻰ ﻭﺣﺩﺓ ﺍﻻﺳﺗﺧﺩﺍﻡ‬ ‫ﺍﻟﻣﺷﺭﻭﻁ ﺃﻭ ﻣﺎ ﺗﺳﻣﻰ ﺑﺎﻟـ ‪ CAM‬ﻭ‬ ‫ﺍﻟﺗﻰ ﺗﻡ ﺗﺭﻛﻳﺑﻬﺎ ﻓﻰ ﻫﺫﻩ ﺍﻟﻭﺣﺩﺓ. ﻭ‬ ‫ﻟﻠﻭﺻﻭﻝ ﻣﺎﺩﻳﺎ ﺍﻟﻰ ﻭﺣﺩﺓ ﺍﻟـ ‪،CAM‬‬ ‫ﻓﻛﻝ ﻣﺎ ﻋﻠﻳﻙ ﻓﻌﻠﻪ ﻫﻭ ﻓﻙ ﺍﻟﻐﻁﺎء‬ ‫ﺍﻟﻣﻭﺟﻭﺩ ﻋﻠﻰ ﺍﻟﻠﻭﺣﺔ ﺍﻟﻌﻠﻭﻳﺔ ﻟﻠﻭﺣﺩﺓ.‬ ‫‪40 TELE-satellite — Global Digital TV Magazine — 12-01/2010 — www.TELE-satellite.com‬‬
  • 5. ‫ﺍﻟﺷﺧﺻﻰ ‪ PC‬ﻭ ﺍﻟﻣﺣﻭﻝ ‪DTTV‬‬ ‫ﻓﻰ ﺍﻟﻭﺍﻗﻊ، ﺇﻥ ﻭﺣﺩﺓ 203-‪ DT‬ﺑﻬﺎ‬ ‫ﺑﺷﺑﻛﺔ ﺣﻭﺍﺳﻳﺏ ﻣﺣﻠﻳﺔ ‪ .LAN‬ﺛﻡ‬ ‫ﻭﺣﺩﺗﻳﻥ ﻣﻧﻔﺻﻠﺗﻳﻥ ﻟﻛﻝ ﻣﺩﺧﻝ.‬ ‫ﺗﻘﻭﻡ ﺑﻭﺿﻊ ﻋﻧﻭﺍﻥ ﺗﻌﺭﻳﻑ ﺍﻹﻧﺗﺭﻧﺕ‬ ‫‪ IP address‬ﻭ ﺍﻟﻘﻧﺎﻉ ﺍﻟﻔﺭﻋﻰ‬ ‫ﻭ ﻳﺗﻡ ﺍﻋﺩﺍﺩ ﺑﺎﻗﻰ ﺍﻟﻭﺣﺩﺍﺕ ﺑﻧﻔﺱ‬ ‫‪ submask‬ﻭ ﻋﻧﻭﺍﻥ ﺍﻟﺑﻭﺍﺑﺔ ﺍﻟﺭﺋﻳﺳﻳﺔ‬ ‫ﺍﻻﺳﻠﻭﺏ. ﻭ ﺇﺫﺍ ﻛﺎﻥ ﻟﻠﻭﺣﺩﺓ ﻣﺧﺭﺝ ﻟﻠﺑﺙ‬ ‫ﻟﻼﻧﺗﺭﻧﺕ ‪ gateway‬ﺩﺍﺧﻝ ﻭﺣﺩﺓ ﺍﻟـ‬ ‫ﺍﻟﺗﻠﻔﺯﻳﻭﻧﻰ ﺍﻟﺭﻗﻣﻰ ﺍﻻﺭﺿﻰ ‪،DVB-T‬‬ ‫008-‪ DT‬ﻳﺩﻭﻳﺎ. ﻣﻊ ﺍﻟﻌﻠﻡ ﺍﻥ ﻧﻅﺎﻡ‬ ‫ﻓﻼ ﺑﺩ ﻣﻥ ﺿﺑﻁ ﻣﺗﻐﻳ ﺭﺍﺕ ﻫﺫﺍ ﺍﻟﺑﺙ ﻣﺛﻝ:‬ ‫ﺗﺧﺻﻳﺹ ﻋﻧﺎﻭﻳﻥ ﺗﻌﺭﻳﻑ ﺍﻻﻧﺗﺭﻧﺕ‬ ‫ﺍﻟﺗﺭﺩﺩ ﻭ ﺍﻻﺿﻌﺎﻑ ‪ attenuation‬ﻭ‬ ‫ﺍﻟﺗﻠﻘﺎﺋﻰ ‪DHCP (Dynamic Host‬‬ ‫ﻧﻅﺎﻡ ﺍﻟﺗﺣﻭﻳﻝ ﺍﻟﺭﻗﻣﻰ ‪FFT mode‬‬ ‫‪ (Configuration Protocol‬ﻏﻳﺭ‬ ‫ﻭ ﻗﻳﻣﺔ ﺍﻟﻣﺩﻯ ﺍﻟﺗﺭﺩﺩﻯ ﺑﻳﻥ ﺍﻟﻘﻧﻭﺍﺕ‬ ‫ﻣﺩﻋﻭﻡ ﻓﻰ ﻫﺫﻩ ﺍﻟﻭﺣﺩﺓ. ﻭ ﻫﺫﺍ ﺃﺣﺩ‬ ‫ﺍﻟﻣﺗﺟﺎﻭﺭﺓ ‪ guard interval‬ﻭ ﻛﻳﻔﻳﺔ‬ ‫ﺍﻻﺷﻳﺎء ﺍﻟﻣﻌﺗﺎﺩﺓ ﻓﻰ ﺍﻻﺟﻬﺯﺓ ﺍﻟﻣﺣﺗﺭﻓﺔ.‬ ‫ﺍﻟﺗﺿﻣﻳﻥ ﺍﻟﺭﻗﻣﻰ ‪ Constellation‬ﻭ‬ ‫ﻭ ﻫﺫﺍ ﺍﻟﺗﻁﺑﻳﻕ ﻳﺟﻌﻝ ﻋﻣﻠﻳﺔ ﺍﻻﻋﺩﺍﺩ‬ ‫ﻣﻌﺩﻝ ﺍﻟﺗﺷﻔﻳﺭ ‪ Code Rate‬ﻭ ﻛﺫﻟﻙ‬ ‫ﺑﻛﺎﻣﻠﻬﺎ ﺃﺳﻬﻝ ﺑﻛﺛﻳﺭ. ﻟﺫﻟﻙ ﻓﺎﻥ ﻫﺫﺍ‬ ‫‪ DVB-T‬ﺍﻟﺗﻰ ﻣﻌﻧﺎ ﻓﻰ ﺍﺧﺗﺑﺎﺭ ﺍﻻﻋﺩﺍﺩ ﺗﻣﻛﻧﺕ ﻣﻥ ﺗﻭﻟﻳﺩ 6 ﺍﺷﺎﺭﺍﺕ ﺍﺭﺿﻳﺔ ‪ DTTV‬ﺇﻥ ﻭﺣﺩﺓ ﺍﻟﺗﺣﻭﻳﻝ ■ ﺃﻳﺿﺎ ﺍﻟﻣﺩﻯ ﺍﻟﺗﺭﺩﺩﻯ ﻟﻠﻘﻧﺎﺓ ‪Channel‬‬ ‫ﻳﻌﺩ ﻣﺳﺎﻋﺩﺓ ﺣﻘﻳﻘﻳﺔ ﻟﻣﻧﻡ ﻳﻘﻭﻡ ﺑﻌﻣﻠﻳﺔ‬ ‫ﻭ ﺑﻔﺭﺽ ﺃﻥ ﺑﻣﻘﺩﻭﺭ ﺍﻟﻔﺭﺩ ﺍﻥ ﻳﻛﻭﻥ ﻟﺩﻳﻪ ﻣﻥ .‪ COFDM‬ﺑﺗﻘﻧﻳﺔ ‪ Multiplexed‬ﻭ ﻗﺩ ﻛﺎﻧﺕ ﻣﺗﺩﺍﺧﻠﺔ ‪.Bandwidth‬‬ ‫ﺍﻟﺗﻧﺻﻳﺏ.‬ ‫ﻓﺈﻥ ﻭﺣﺩﺓ ﺍﻟﺗﺣﻭﻳﻝ ،‪ carrier‬ﻋﻠﻰ ﻛﻝ ﺍﺷﺎﺭﺓ ﺣﺎﻣﻠﺔ ‪ 8 SDTV‬ﺍﻟﻰ 01 ﻗﻧﻭﺍﺕ ﺗﻠﻔﺯﻭﻧﻲ ﺭﻗﻣﻳﺔ ﺗﻘﻠﻳﺩﻳﺔ‬ ‫!ﻳﻣﻛﻧﻬﺎ ﺃﻥ ﺗﺯﻭﺩﻧﺎ ﺑﻌﺩﺩ ﻣﻥ 04 ﺍﻟﻰ 06 ﻗﻧﺎﺓ ‪DTTV‬‬ ‫ﻭ ﻛﻣﺎ ﺗﺭﻯ، ﻓﺈﻥ ﻛﻣﻳﺔ ﺍﻻﻋﺩﺍﺩﺍﺕ‬ ‫ﺍﻻﺩﺍء‬ ‫ﻛﺑﻳﺭﺓ. ﻓﺎﺫﺍ ﺍﺭﺩﺕ ﺗﻐﻳﻳﺭ ﺑﻳﺎﻧﺎﺕ‬ ‫ﻣﺳﺗﺟﻳﺏ ‪ transponder‬ﺍﻟﺑﺙ‬ ‫ﺇﻥ ﺟﻭﺩﺓ ﺍﻻﺷﺎﺭﺓ ﺍﻟﺗﻰ ﻳﺧﺭﺟﻬﺎ‬ ‫ﺍﻟﺗﻠﻔﺯﻳﻭﻧﻰ ﺍﻟﺭﻗﻣﻰ ﻋﺑﺭ ﺍﻻﻗﻣﺎﺭ‬ ‫ﺍﻟﺟﻬﺎﺯ ﻋﻅﻳﻣﺔ ﺑﺎﻟﻔﻌﻝ. ﻭ ﻫﺫﺍ ﺃﻓﺿﻝ‬ ‫ﺍﻟﺻﻧﺎﻋﻳﺔ ‪ ،DVB-S‬ﻓﻬﺫﻩ ﻟﻳﺳﺕ‬ ‫ﺃﻓﺿﻝ ﺑﻛﺛﻳﺭ ﻣﻣﺎ ﺗﺳﺗﻁﻳﻊ ﺍﻟﺣﺻﻭﻝ‬ ‫ﻣﺷﻛﻠﺔ. ﺣﻳﺙ ﻳﻣﻛﻧﻙ ﺍﻟﻘﻳﺎﻡ ﺑﺫﻟﻙ ﻓﻰ‬ ‫ﻋﻠﻳﻪ ﻣﻥ ﻭﺣﺩﺓ ﺍﻟـ ‪ LNB‬ﻻﺳﺗﻘﺑﺎﻝ‬ ‫ﺧﻼﻝ ﻭﻗﺕ ﻗﺻﻳﺭ ﻟﻠﻐﺎﻳﺔ. ﻭ ﻟﻛﻥ ﺍﺫﺍ‬ ‫ﺍﻻﻗﻣﺎﺭ ﺍﻟﺻﻧﺎﻋﻳﺔ ﻭ ﻣﻥ ﻫﻭﺍﺋﻳﺎﺕ‬ ‫ﻛﺎﻥ ﻫﺫﺍ ﻫﻭ ﺍﻻﻋﺩﺍﺩ ﺍﻻﻭﻟﻰ ﻓﻘﺩ ﻳﺄﺧﺫ‬ ‫ﺍﺳﺗﻘﺑﺎﻝ ﺍﻟﺑﺙ ﺍﻻﺭﺿﻰ. ﻭ ﻫﺫﺍ ﻻﻥ‬ ‫ﻣﻧﻙ ﺑﻌﺽ ﺍﻟﻭﻗﺕ. ﻭ ﻟﺟﻌﻝ ﺍﻻﻣﺭ‬ ‫ﺍﻟﻭﺣﺩﺍﺕ ‪ modules‬ﻟﺩﻳﻬﺎ ﻣﻘﺩﻣﺎﺕ ﻭ‬ ‫ﻣﺭﻳﺣﺎ ﺃﻛﺛﺭ ﻣﻥ ﻫﺫﺍ، ﻓﻘﺩ ﻗﺎﻣﺕ‬ ‫ﻧﻬﺎﻳﺎﺕ ﺟﻳﺩﺓ ﺟﺩﺍ، ﻓﻬﻰ ﺗﻔﻙ ﺗﺿﻣﻳﻥ‬ ‫ﺷﺭﻛﺔ ‪ Promax‬ﺑﺗﻁﻭﻳﺭ ﺑﺭﻧﺎﻣﺞ‬ ‫ﺍﺷﺎ ﺭﺍﺕ ﺍﻟﺑﺙ ﺍﻟﺗﻠﻳﻔﺯﻳﻭﻧﻰ ﺍﻟﺭﻗﻣﻰ‬ ‫ﻳﺗﻡ ﺗﻧﺻﻳﺑﻪ ﻋﻠﻰ ﺣﺎﺳﺏ ﺷﺧﺻﻰ‬ ‫ﻋﺑﺭ ﺍﻻﻗﻣﺎﺭ ﺍﻟﺻﻧﺎﻋﻳﺔ 2‪DVB-S/S‬‬ ‫ﻟﻠﺗﺣﻛﻡ ﻓﻰ ﺍﻟﻣﺣﻭﻝ ‪ .DTTV‬ﻭ ﻟﻛﻥ‬ ‫ﺃﻭ ﺍﺷﺎ ﺭﺍﺕ ﺍﻟﺑﺙ ﺍﻟﺗﻠﻔﺯﻳﻭﻧﻰ ﺍﻟﺭﻗﻣﻰ‬ ‫ﺃﻭﻻ ﻻﺑﺩ ﻣﻥ ﺗﻭﺻﻳﻝ ﻛﻼ ﻣﻥ ﺍﻟﺣﺎﺳﺏ‬ ‫ﺗﻔﺎﺻﻳﻝ ﺍﻟﻘﻧﺎﺓ ﺍﻟﻔﺿﺎﻳﺔ ‪ PATIO.TV‬ﻭ ﻗﺩ ﺗﻡ ﺗﺣﻭﻳﻠﻬﺎ ﺍﻟﻰ ﻗﻧﺎﺓ ﺍﺭﺿﻳﺔ ‪■ .DVB-T‬‬ ‫ﺍﻻﺭﺿﻰ ‪ DVB-T‬ﺛﻡ ﺗﻘﻭﻡ ﺑﺗﺻﺣﻳﺢ‬ ‫ﺍﻻﺧﻁﺎء ‪ bit errors‬ﺛﻡ ﺗﻌﻳﺩ ﺗﺿﻣﻳﻥ‬ ‫‪ re-modulate‬ﺍﻻﺷﺎ ﺭﺍﺕ ‪transport‬‬ ‫‪ stream‬ﻟﺗﺻﺑﺢ ﻛﺎﺷﺎ ﺭﺍﺕ ﺍﻟﺑﺙ‬ ‫ﺍﻟﺗﻠﻔﺯﻳﻭﻧﻰ ﺍﻻﺭﺿﻰ ‪ .DVB-T‬ﻭ‬ ‫ﺑﻔﺿﻝ ﻫﺫﺍ، ﻻ ﺗﺟﺩ ﺃﺧﻁﺎء ‪bit errors‬‬ ‫ﻓﻰ ﺍﻻﺷﺎﺭﺓ ﺍﻟﺗﻰ ﻳﺧﺭﺟﻬﺎ ﺍﻟﺟﻬﺎﺯ.ﻭ‬ ‫ﻛﻝ ﺍﻟﻣﺗﻐﻳ ﺭﺍﺕ ﺍﻟﻣﺗﻌﻠﻘﺔ ﺑﺟﻭﺩﺓ ﺍﻻﺷﺎﺭﺓ‬ ‫ﻣﺛﻝ: ﻣﻌﺩﻝ ﺧﻁﺄ ﺍﻟﻘﻧﺎﺓ ‪ CBER‬ﻭ‬ ‫ﻣﻌﺩﻝ ﺍﻟﺧﻁﺄ ﺑﻌﺩ ﺗﺻﺣﻳﺢ ﻓﻳﺗﻳﺭﺑﻰ‬ ‫‪ VBER‬ﻭ ﻧﺳﺑﺔ ﺍﻻﺷﺎﺭﺓ ﺍﻟﻰ ﺍﻟﺗﺷﻭﻳﺵ‬ ‫‪ C/N‬ﻭ ﻣﻌﺩﻝ ﺧﻁﺄ ﺍﻟﺗﺿﻣﻳﻥ ‪MER‬‬ ‫ﻛﻠﻬﺎ ﻣﻣﺗﺎﺯﺓ ﻋﻠﻰ ﺍﻻﻁﻼﻕ. ﻭ ﻋﻧﺩﻣﺎ‬ ‫ﺗﻘﻭﻡ ﺑﺗﻭﺻﻳﻝ ﺟﻬﺎﺯ ﺗﻠﻔﺯﻳﻭﻥ ﺣﺩﻳﺙ‬ ‫ﻭﻟﻭ ﺣﺗﻰ ﻓﻰ ﻧﻬﺎﻳﺔ ﺷﺑﻛﺔ ﻛﺎﺑﻼﺕ ﻛﺑﻳﺭﺓ‬ ‫ﺟﺩﺍ ﺳﺗﻅﻝ ﺍﻻﺷﺎﺭﺓ ﺟﻳﺩﺓ ﺟﺩﺍ ﺟﺩﺍ. ﻭ ﺍﻧﻧﺎ‬ ‫ﻟﻡ ﻧﺟﺩ ﻭﻟﻭ ﻣﺗﻐﻳﺭ ﻭﺍﺣﺩ ﻣﻥ ﺍﻟﻣﺗﻐﻳ ﺭﺍﺕ‬ ‫ﺍﻟﺳﺎﺑﻘﺔ ﻟﻛﻰ ﻧﻌﺗﺭﺽ ﻋﻠﻳﻪ.‬ ‫ﺧﻼﺻﺔ ﺍﻟﻘﻭﻝ‬ ‫ﺇﻥ ﻭﺣﺩﺓ ﺍﻟﺗﺣﻭﻳﻝ ‪ DTTV‬ﻋﺑﺎﺭﺓ‬ ‫ﻋﻥ ﻧﻅﺎﻡ ﺍﺳﺗﻘﺑﺎﻝ ﺑﺙ ﺗﻠﻔﺯﻳﻭﻧﻰ ﺭﻗﻣﻰ‬ ‫ﺍﺭﺿﻰ ‪ DVB-T headend‬ﺫﺍﺕ ﺇﺷﺎﺭﺓ‬ ‫ﺧﺭﺝ ﻣﺛﺎﻟﻳﺔ ﻭ ﺍﻣﻛﺎﻧﻳﺔ ﺍﻋﺩﺍﺩ ﻫﺎﺋﻠﺔ‬ ‫ﺟﺩﺍ. ﺇﻥ ﺍﻟﻭﺣﺩﺍﺕ ﺍﻟﺗﻰ ﻛﺎﻧﺕ ﻟﺩﻳﻧﺎ ﻓﻰ‬ ‫ﺭﻑ ‪ rack‬ﺍﻻﺧﺗﺑﺎﺭ ﻣﺗﺎﺣﺔ ﻟﺩﻯ ﺷﺭﻛﺔ‬ ‫‪ Promax‬ﻭ ﻟﻛﻥ ﺍﻟﻘﻠﻳﻝ ﻣﻧﻬﺎ.ﻭ ﻟﻠﻣﺯﻳﺩ‬ ‫ﻣﻥ ﺍﻟﺗﻔﺎﺻﻳﻝ ﻳﻣﻛﻧﻙ ﺯﻳﺎﺭﺓ ﻣﻭﻗﻬﺎ ﺍﻟﺗﺎﻟﻰ‬ ‫.‪w w w.proma xelectronic s‬‬ ‫‪ com‬ﻋﻠﻰ ﺷﺑﻛﺔ ﺍﻻﻧﺗﺭﻧﺕ. ﻭ ﺇﺫﺍ ﻛﻧﺕ‬ ‫ﺗﻔﻛﺭ ﺑﺟﺩﻳﺔ ﻓﻰ ﻧﻅﺎﻡ ﺍﺳﺗﻘﺑﺎﻝ ﺍﺍﺭﺳﺎﻝ‬ ‫ﻋﺑﺭ ﺍﻟﻛﺎﺑﻼﺕ ‪cable headend‬‬ ‫ﻭ ﺗﺭﻳﺩ ﺃﻥ ﺗﻭﻓﺭ ﺟﻳﺩﺍ ﻓﻰ ﻣﺎﺩﻳﺎﺕ‬ ‫ﺍﻋﺩﺍﺩ ﻭ ﺗﻧﺻﻳﺏ ﻭﺣﺩﺓ ﺍﻟـ 203-‪ .DT‬ﻭ ﻳﻣﻛﻧﻙ ﺍﻥ ﺗﺭﻯ ﺍﻋﺩﺍﺩ ﺗﺭﺩﺩ ﺍﻟﻣﺳﺗﺟﻳﺏ ‪ transponder‬ﺍﻟﻣﺭﺍﺩ ﺍﺳﺗﻘﺑﺎﻟﻪ ﻗﺩ ﺗﻡ ﻓﻙ ﺗﺿﻣﻳﻧﻪ -‪ ■ demo‬ﺍﻟﻣﺷﺭﻭﻉ ﻓﻳﺟﺏ ﺍﻥ ﺗﺄﺧﺫ ﻓﻰ ﺍﻋﺗﺑﺎﺭﻙ‬ ‫ﻭﺣﺩﺓ ﺍﻟﺗﺣﻭﻳﻝ ‪.DTTV‬‬ ‫‪ dulated‬ﺍﻟﻰ ﺳﻳﻝ ﻧﻘﻰ ﻣﻥ ﺍﻟﺑﻳﺎﻧﺎﺕ ‪.transport stream‬‬ ‫‪42 TELE-satellite — Global Digital TV Magazine — 12-01/2010 — www.TELE-satellite.com‬‬
  • 6. ‫ﺭﺃﻯ ﺃﺣﺩ ﺍﻟﺧﺑﺭﺍء‬ ‫‪TECHNICAL‬‬ ‫+‬ ‫‪DATA‬‬ ‫ﺍﻻﻋﺩﺍﺩﺍﺕ ﻣﺭﻧﺔ ﺟﺩﺍ. ﻭ ﻭﺍﺟﻬﺔ ﻣﺳﺗﺧﺩﻡ ﺑﺳﻳﻁﺔ.‬ ‫‪Manufacturer‬‬ ‫‪Promax Electronica, S.A., Barcelona, Spain‬‬ ‫ﺍﻻﺷﺎﺭﺍﺕ ﺍﻟﺗﻰ ﻳﺧﺭﺟﻬﺎ ﺍﻟﺟﻬﺎﺯ ﺟﻳﺩﺓ ﻭ ﻗﻭﻳﺔ ﻟﻠﻐﺎﻳﺔ.‬ ‫‪Internet‬‬ ‫‪www.promaxelectronics.com‬‬ ‫‪info@promaxelectronics.com‬‬ ‫ﻻ ﺣﺎﺟﺔ ﻻﺟﻬﺯﺓ ﺍﺳﺗﻘﺑﺎﻝ ﺑﺙ ﺗﻠﻔﺯﻳﻭﻧﻰ ﺭﻗﻣﻰ ﻋﺑﺭ ﺍﻟﻛﺎﺑﻼﺕ‬ ‫‪Phone‬‬ ‫20 02 062 39 430+‬ ‫‪ DVBC set-top-boxes‬ﻋﻧﺩ ﺍﻟﻌﻣﻳﻝ.‬ ‫‪Fax‬‬ ‫62 11 833 39 430+‬ ‫-‬ ‫‪Jacek Pawlowski‬‬ ‫‪Model‬‬ ‫‪Digital To TV‬‬ ‫ﺑﻌﺽ ﺍﻟﺧﺻﺎﺋﺹ ﺍﻟﻭﻅﻳﻔﻳﺔ ﺍﻟﻣﻭﺟﻭﺩﺓ ﺑﺎﻧﻅﻣﺔ ﺍﻟﺑﺙ ﺍﻟﺗﻠﻔﺯﻳﻭﻧﻰ‬ ‫‪TELE-satellite‬‬ ‫‪Test Center‬‬ ‫ﺍﻟﺭﻗﻣﻰ ﻋﺑﺭ ﺍﻟﻛﺎﺑﻼﺕ ‪ DVB-C‬ﺍﻟﻌﺎﺩﻳﺔ )ﻣﺛﻝ ﺧﺎﺻﻳﺔ ﺍﻟﻘﻧﻭﺍﺕ‬ ‫‪Poland‬‬ ‫‪Description‬‬ ‫)‪DVB-T headend for cable networks (SMATV‬‬ ‫ﺍﻟﺗﻰ ﻳﺗﺻﻝ ﺍﻟﻣﺳﺗﺧﺩﻡ ﻣﻥ ﺧﻼﻟﻬﺎ ﺑﻣﺯﻭﺩ ﺍﻟﺧﺩﻣﺔ ﻭ ﺗﻘﻭﻡ ﺑﻧﻘﻝ‬ ‫‪Inputs‬‬ ‫‪DVB-S/S2, DVB-T (e.g. from the aerial), A/V analog, IPTV, TS-ASI‬‬ ‫ﺍﻟﺑﻳﺎﻧﺎﺕ ﻓﻰ ﺍﻻﺗﺟﺎﻩ ﺍﻟﻌﻛﺳﻰ ﻭ ﺗﺳﻣﻰ ‪ (return channel‬ﻣﺳﺗﺣﻳﻠﺔ ﻓﻰ ﻫﺫﺍ ﺍﻟﺟﻬﺎﺯ.‬ ‫‪Output‬‬ ‫‪DVB-T COFDM‬‬ ‫ﻛﺫﻟﻙ ﺍﻳﺿﺎ ﻋﺩﺩ ﺍﻟﻘﻧﻭﺍﺕ ﺍﻟﺭﻗﻣﻳﺔ ﺍﻟﻣﺳﻣﻭﺡ ﺑﻬﺎ ﺍﻗﻝ ﻣﻧﻬﺎ ﻓﻰ ﺣﺎﻟﺔ ﻧﻅﺎﻡ ﺍﻟﺑﺙ ‪DVB-C‬‬ ‫‪Power supply‬‬ ‫‪120/240 V 50/60 Hz‬‬ ‫) ﻭ ﻟﻛﻥ ﻫﺫﺍ ﺿﺭﻭﺭﻯ ﻓﻘﻁ ﺍﺫﺍ ﻛﻧﺕ ﺗﺭﻳﺩ ﺗﺯﻭﻳﺩ ﺍﻟﻣﺷﺗﺭﻛﻳﻥ ﺑﺎﻛﺛﺭ ﻣﻥ 002 ﻗﻧﺎﺓ(.‬ ‫■‬ ‫ﻟﻘﻁﺔ ﻟﺗﻁﺑﻳﻕ ﺍﻟﺗﺣﻛﻡ ﻓﻰ ﻧﻅﺎﻡ ﺍﻟﺗﺣﻭﻳﻝ ‪.DTTV‬‬ ‫■‬ ‫ﻭﺣﺩﺓ 203-‪ DT‬ﺑﻬﺎ ﻭﺣﺩﺗﻰ ﺍﺳﺗﺧﺩﺍﻡ ﻣﺷﺭﻭﻁ ﺃﻭ‪CAM (Conditional‬‬ ‫■‬ ‫ﺍﻟﻠﻣﺑﺎﺕ ‪ LED’s‬ﺍﻟﺗﻰ ﺗﺿﺋﺑﺎﻟﻠﻭﻥ ﺍﻻﺧﺿﺭ ﺗﺷﻳﺭ ﺍﻟﻰ ﺃﻥ ﻭﺣﺩﺓ 203-‪ DT‬ﻗﺩ‬ ‫‪ (Access Module‬ﻣﻭﺟﻭﺩﺓ ﺑﺎﻻﻋﻠﻰ ﺍﺳﻔﻝ ﻏﻁﺎء. ﻭ ﻫﻣﺎ ﻗﺎﺩﺭﺗﺎﻥ ﻋﻠﻰ ﻓﻙ‬ ‫ﺗﻭﺍﻓﻘﺕ ﻣﻊ ﻣﺳﺗﺟﻳﺏ ‪ transponder‬ﺍﻟﻘﻣﺭ ﺍﻟﺻﻧﺎﻋﻰ ﻭ ﺃﻥ ﻭﺣﺩﺓ 201-‪DT‬‬ ‫ﺗﺷﻔﻳﺭ ﺍﻟﻘﻧﻭﺍﺕ ﺍﻟﻣﺷﻔﺭﺓ. ﻭ ﺑﺎﻟﻁﺑﻊ ﻫﺫﺍ ﻳﺗﻁﻠﺏ ﻣﻧﻙ ﺍﻥ ﺗﺿﻊ ﻛﺭﻭﺕ ﺫﻛﻳﺔ ﺻﺎﻟﺣﺔ‬ ‫ﺗﻘﻭﻡ ﺑﺎﺧﺭﺍﺝ ﺍﺷﺎﺭﺓ ﺑﺙ ﺗﻠﻔﺯﻳﻭﻧﻰ ﺭﻗﻣﻰ ﺍﺭﺿﻰ ‪ DVB-T‬ﺻﺣﻳﺣﺔ.‬ ‫ﺍﻻﺳﺗﺧﺩﺍﻡ.‬ ‫‪www.TELE-satellite.com — 12-01/2010 — TELE-satellite — Global Digital TV Magazine‬‬ ‫34‬