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¿µ¹®Ç¥Áظí 40-Gigabit-Capable Passive Optical Networks (NG-PON2): Physical Media Dependent (PMD) Layer Specification
Çѱ۳»¿ë¿ä¾à ITU-T G.989.2´Â ÇÏÇâ 40Gbit/s ¹× »óÇâ 10Gbit/sÀÇ Àü¼Û¿ë·®À» °¡Áö´Â ¼öµ¿Çü ±¤Åë½Å¸Á(NG-PON2)ÀÇ ¹°¸® ¸Åü ÀÇÁ¸ °èÃþ ±Ô°ÝÀ» ±ÔÁ¤ÇÑ´Ù. NG-PON2´Â ¸ð¹ÙÀÏ ¹éȦ, ºñÁî´Ï½º ¹× °¡ÀÔÀÚ ¼­ºñ½º¿¡ ÇÊ¿äÇÑ ´ë¿ªÆø ¿ä±¸ »çÇ×À» Áö¿øÇÒ ¼ö ÀÖ´Â À¯¿¬ÇÑ ±¤ ¾×¼¼½º ³×Æ®¿öÅ©ÀÌ´Ù. ¶ÇÇÑ, G.989 Ç¥Áؽø®Áî´Â »óÇâ ¹× ÇÏÇâ ¼Óµµ¸¦ ´Ù¾çÇÏ°Ô Áö¿øÇÒ ¼ö ÀÖ´Ù. NG-PON2 ÆÄÀåÇ÷£Àº ·¹°Å½Ã PON ½Ã½ºÅÛ°ú ±¤ÆÄÀå ¿À¹ö·¹À̸¦ ÅëÇØ »óÈ£°øÁ¸ÀÌ °¡´ÉÇϵµ·Ï Á¤ÀÇÇÑ´Ù. Àü¼Û ¼ö·Å °èÃþ Ç¥ÁØ(G.989.3)Àº ITU-T G.987.3À» ±â¹ÝÀ¸·Î ±¸¼ºµÇ¸ç, NG-PON2¸¦ À§ÇØ º¯°æµÈ ºÎºÐÀ» Ãß°¡ÇÑ´Ù. NG-PON2ÀÇ È®ÀåÀ» À§ÇÑ ONU °ü¸® ¹× Á¦¾î ÀÎÅÍÆäÀ̽º(OMCI) ±Ô°ÝÀº ITU-T G.988¿¡ ±âÀçµÈ´Ù.
ÀÌ Ç¥ÁØÀº ½Ã°£°ú ÆÄÀå ´ÙÁßÈ­µÈ ä³ÎÀÇ Æ¯¼ºÀ» °¡Áø ÇÏÀ̺긮µå ¼öµ¿Çü ±¤³×Æ®¿öÅ© (TWDM-PON)À» ±ÔÁ¤Çϸç, ¼±ÅÃÀûÀ¸·Î ÆÄÀå°¡º¯ PtP WDM ¼öµ¿Çü ±¤³×Æ®¿öÅ©¿¡ ´ëÇؼ­µµ ±â¼úÇÑ´Ù. ÀÌ Ç¥ÁØ¿¡¼­ ¼³¸íµÇ´Â TWDM-PONÀº ITU-T G.984 ¹× G.987 ½Ã¸®Áî¿¡ ±âÀçµÈ ½Ã½ºÅÛÀÌ ¹ßÀüµÈ °ÍÀÌ´Ù. ÀÌ Ç¥ÁØÀº ±âÁ¸ ±â¼ú ¹× ÀÌ¹Ì Æ÷¼³µÈ ±¤°¡ÀÔÀÚ ½Ã½ºÅÛ°ú ±¤ÀÎÇÁ¶ó¸¦ ÃÖ´ëÇÑ °øÁ¸ÇÒ ¼ö ÀÖµµ·Ï ITU-T G.984.1°ú G.987.1ÀÇ ±Ô°ÝÀ» À¯ÁöÇÑ´Ù.
G.989.2(2019)´Â ¹°¸® ¸Åü ÀÇÁ¸(PMD) °èÃþ »ç¾ç¿¡ ´ëÇØ °è¼ÓÇؼ­ À¯ÁöÇÏ°í º¸¿ÏÇØ¿À°í ÀÖ´Ù. ÀÌ Ç¥ÁØÀÇ Corrigendum 1Àº TWDM-PON ÇÏÇâ (ONU ¼ö½Å) X/S ¸Å°³º¯¼ö¿¡ ´ëÇÑ Å×À̺í 10-1À» ¼öÁ¤ÇÑ´Ù.
ÀÌ Ç¥ÁØÀÇ Amendment 1Àº ÃÖ±ÙÀÇ ¹°¸® ¸Åü ÀÇÁ¸ °èÃþ »ç¾çÀÇ º¯°æ »çÇ×À» ¹Ý¿µÇϱâ À§ÇØ Àü·Â ½ºÆåÆ®·³ ¹Ðµµ(PSD) °ª¿¡ ´ëÇÑ ºÎ·Ï D¸¦ ¾÷µ¥ÀÌÆ®ÇÑ´Ù.
¿µ¹®³»¿ë¿ä¾à Standard TTAE.IT-G.989.2/R2 specifies the physical media dependent (PMD) layer requirements for a passive optical network (PON) system with a nominal aggregate capacity of 40 Gbit/s in the downstream direction and 10 Gbit/s in the upstream direction, hereinafter referred to as NG-PON2. NG-PON2 is a flexible optical fibre access network capable of supporting the bandwidth requirements of mobile backhaul, business and residential services. Furthermore, this standard describes optional configurations, to extend beyond this nominal capacity, as the ITU-T G.989 series of Recommendations allows for multiple upstream and downstream line rates.
The NG-PON2 wavelength plan is defined to enable the coexistence through wavelength overlay with legacy PON systems (see ITU-T G.989.1). The transmission convergence (TC) layer is based on recommendation ITU-T G.987.3, with unique modifications for NG-PON2 captured in recommendation ITU-T G.989.3. The optical network unit (ONU) management and control interface (OMCI) specifications are described in standard ITU-T G.988 for NG-PON2 extensions.
This standard specifies the characteristics of hybrid time and wavelength division multiplexing (TWDM) channels, referred to as TWDM-PON. The characteristics of optional, tunable point-to-point wavelength overlay channels are also described, referred to as point-to-point wavelength division multiplexing (PtP WDM) PON.
The TWDM-PON described in this standard represents a further development from the systems described in the ITU-T G.984 and ITU-T G.987 series of Recommendations. To the greatest extent possible, this standard retains the requirements of ITU-T G.984.1 and ITU-T G.987.1 to ensure maximal reuse of existing technology and compatibility with deployed optical access systems and optical fibre infrastructure.
Edition 2.0 continues the maintenance and evolution of physical media dependent (PMD) layer specification.
Corrigendum 1 revises Table 10-1 on TWDM-PON downstream (ONU receive) X/S parameters.
Amendment 1 updates Annex D on power spectral density (PSD) values, to reflect the more recent changes in the PMD spec.
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°ü·ÃÆÄÀÏ TTAE.IT-G.989.2R2.pdf TTAE.IT-G.989.2R2.pdf            

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