TELE-satellite ara, profile picture
Uploaded byTELE-satellite ara
198 views

Promax

Download to read offline
‫‪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

More Related Content

PDF
Nanosat
byTELE-satellite ara
 
PDF
Topfield
byTELE-satellite ara
 
PDF
Abipbox
byTELE-satellite ara
 
PDF
Gtsat
byTELE-satellite ara
 
PDF
Technotrend Hdmi
byTELE-satellite ara
 
PDF
Opensat
byTELE-satellite ara
 
PDF
Abcom
byTELE-satellite ara
 
PDF
Topfield
byTELE-satellite ara
 
Nanosat
byTELE-satellite ara
 
Topfield
byTELE-satellite ara
 
Abipbox
byTELE-satellite ara
 
Gtsat
byTELE-satellite ara
 
Technotrend Hdmi
byTELE-satellite ara
 
Opensat
byTELE-satellite ara
 
Abcom
byTELE-satellite ara
 
Topfield
byTELE-satellite ara
 

What's hot

PDF
Tevii
byTELE-satellite ara
 
PDF
Tevii
byTELE-satellite ara
 
PDF
Arion
byTELE-satellite ara
 
PDF
Technotrend
byTELE-satellite ara
 
PDF
Nanoxx
byTELE-satellite ara
 
PDF
Technomate
byTELE-satellite ara
 
PDF
Opensat
byTELE-satellite ara
 
PDF
Satexpo
byTELE-satellite ara
 
PDF
Technotrend
byTELE-satellite ara
 
PDF
Abcom
byTELE-satellite ara
 
PDF
Dvbshop
byTELE-satellite ara
 
PDF
Spaun
byTELE-satellite ara
 
PDF
Technisat
byTELE-satellite ara
 
PDF
Arion
byTELE-satellite ara
 
Tevii
byTELE-satellite ara
 
Tevii
byTELE-satellite ara
 
Arion
byTELE-satellite ara
 
Technotrend
byTELE-satellite ara
 
Nanoxx
byTELE-satellite ara
 
Technomate
byTELE-satellite ara
 
Opensat
byTELE-satellite ara
 
Satexpo
byTELE-satellite ara
 
Technotrend
byTELE-satellite ara
 
Abcom
byTELE-satellite ara
 
Dvbshop
byTELE-satellite ara
 
Spaun
byTELE-satellite ara
 
Technisat
byTELE-satellite ara
 
Arion
byTELE-satellite ara
 

Viewers also liked

PDF
Jinotech
bywon ho
 
PDF
Trimax
byTELE-satellite ara
 
PDF
Jiuzhou
byTELE-satellite ara
 
PDF
Creating new service name for oracle database
byRavi Kumar Lanke
 
PDF
Sowell
byTELE-satellite ara
 
PPTX
Windows と leopard
byMasaya Sawada
 
PPT
Duurzaam Inkopen
byNetherlands Enterprise Agency (RVO.nl)
 
PDF
Oracle bi 11.1.1.6.1 and adf integration
byRavi Kumar Lanke
 
PPT
Duurzaam Inkopen - Rijksgebouwendienst
byNetherlands Enterprise Agency (RVO.nl)
 
PDF
Deploying an application into oracle endeca tools and frame works
byRavi Kumar Lanke
 
PPTX
Andere manieren van samenwerken bij Energieprestatiecontracten
byNetherlands Enterprise Agency (RVO.nl)
 
PPT
Session1 part1
bymaovkh
 
PDF
Роль смартфонов на пути к покупке средств по уходу за кожей 2016
bySegrey Nikishov - @n_grey
 
PPT
Effectief samenwerken in de bouwketen - deel 2
byAtrivé
 
PDF
Updating Your GivingFirst.org Profile
byBryce Wilkinson
 
PPTX
Field study dr a razzaq - day 1-session3
byFadi Nijem , MBA, MSc, CM, CPT, CCSE
 
PPTX
Prospective Franchisee Boot Camp Cummary (Perkins Law, October 2014)
byPerkins Law, PLLC
 
PPTX
Metabolisme 3
byDhita Ayu Distarasiswa
 
PPTX
Ano dos bosques
byMarcos da Portela
 
DOC
Noticias TEL enero 2012
byFrancisco Apablaza
 
Jinotech
bywon ho
 
Trimax
byTELE-satellite ara
 
Jiuzhou
byTELE-satellite ara
 
Creating new service name for oracle database
byRavi Kumar Lanke
 
Sowell
byTELE-satellite ara
 
Windows と leopard
byMasaya Sawada
 
Duurzaam Inkopen
byNetherlands Enterprise Agency (RVO.nl)
 
Oracle bi 11.1.1.6.1 and adf integration
byRavi Kumar Lanke
 
Duurzaam Inkopen - Rijksgebouwendienst
byNetherlands Enterprise Agency (RVO.nl)
 
Deploying an application into oracle endeca tools and frame works
byRavi Kumar Lanke
 
Andere manieren van samenwerken bij Energieprestatiecontracten
byNetherlands Enterprise Agency (RVO.nl)
 
Session1 part1
bymaovkh
 
Роль смартфонов на пути к покупке средств по уходу за кожей 2016
bySegrey Nikishov - @n_grey
 
Effectief samenwerken in de bouwketen - deel 2
byAtrivé
 
Updating Your GivingFirst.org Profile
byBryce Wilkinson
 
Field study dr a razzaq - day 1-session3
byFadi Nijem , MBA, MSc, CM, CPT, CCSE
 
Prospective Franchisee Boot Camp Cummary (Perkins Law, October 2014)
byPerkins Law, PLLC
 
Metabolisme 3
byDhita Ayu Distarasiswa
 
Ano dos bosques
byMarcos da Portela
 
Noticias TEL enero 2012
byFrancisco Apablaza
 

More from TELE-satellite ara

PDF
ara TELE-audiovision-1309
byTELE-satellite ara
 
PDF
Horizon
byTELE-satellite ara
 
PDF
ara TELE-audiovision-1311
byTELE-satellite ara
 
PDF
Feature dvbs3
byTELE-satellite ara
 
PDF
Mktech
byTELE-satellite ara
 
PDF
Amiko
byTELE-satellite ara
 
PDF
Feature satip4
byTELE-satellite ara
 
PDF
Speedcast
byTELE-satellite ara
 
PDF
Abipbox
byTELE-satellite ara
 
PDF
Spaun
byTELE-satellite ara
 
PDF
Icecrypt
byTELE-satellite ara
 
PDF
Deviser2
byTELE-satellite ara
 
PDF
Work microwave
byTELE-satellite ara
 
PDF
Editorial
byTELE-satellite ara
 
PDF
Globalinvacom
byTELE-satellite ara
 
PDF
Spaun
byTELE-satellite ara
 
PDF
Elnet
byTELE-satellite ara
 
PDF
Mfc
byTELE-satellite ara
 
PDF
Oreind
byTELE-satellite ara
 
PDF
Bsd
byTELE-satellite ara
 
ara TELE-audiovision-1309
byTELE-satellite ara
 
Horizon
byTELE-satellite ara
 
ara TELE-audiovision-1311
byTELE-satellite ara
 
Feature dvbs3
byTELE-satellite ara
 
Mktech
byTELE-satellite ara
 
Amiko
byTELE-satellite ara
 
Feature satip4
byTELE-satellite ara
 
Speedcast
byTELE-satellite ara
 
Abipbox
byTELE-satellite ara
 
Spaun
byTELE-satellite ara
 
Icecrypt
byTELE-satellite ara
 
Deviser2
byTELE-satellite ara
 
Work microwave
byTELE-satellite ara
 
Editorial
byTELE-satellite ara
 
Globalinvacom
byTELE-satellite ara
 
Spaun
byTELE-satellite ara
 
Elnet
byTELE-satellite ara
 
Mfc
byTELE-satellite ara
 
Oreind
byTELE-satellite ara
 
Bsd
byTELE-satellite ara
 

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 ﺍﻟﺭﺟﺎﻝﺍﻟﻌﺎﻣﻠﻭﻥ 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 ﺍﻟﺗﻰﺗﺄﺧﺫ‬ ‫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 ‪ PC‬ﻭﺍﻟﻣﺣﻭﻝ ‪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 ‫‪[email protected]‬‬ ‫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