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¿µ¹®Ç¥Áظí Performance parameter definitions for quality of speech and other voiceband applications utilizing IP networks
Çѱ۳»¿ë¿ä¾à À½¼ºÀü¼Û°ú ÆÐŶ¸Á »ó¿¡¼­ À½¼º´ë¿ª Àü¼ÛÀº °¡²û Ư¡ÀûÀÎ Ç°ÁúÀúÇϸ¦ °¡Á®¿À°ï ÇÑ´Ù. ÆÐŶ¸Á ¼º´É ÆĶó¹ÌÅ͸¦ À§ÇÑ ¸¹Àº ±âÁ¸ÀÇ Á¤ÀÇ°¡ ÀÖÁö¸¸, À¶Å뼺 ¾ø´Â µî½Ã¼º ÀÀ¿ë ¼­ºñ½ºµéÀÇ Ç°ÁúÀ» Á¦¾îÇÏ°íÀÚÇÏ´Â ¿å±¸´Â ºÎ°¡ÀûÀÎ Á¤º¸¸¦ ÇÊ¿ä·Î ÇÑ´Ù. º» Ç¥ÁØÀÇ ¸ñÀûÀº ÀÀ¿ë ¼­ºñ½ºÀÇ ¹Þ¾ÆµéÀϸ¸ÇÑ Ç°ÁúÀ» Àß ¹Ý¿µÇÏ´Â ÆÐŶ¸Á°ú ´Ü¸» ¼º´É ÆĶó¹ÌÅ͵éÀ» Á¤ÀÇÇÏ´Â °ÍÀÌ´Ù. º» Ç¥ÁØ¿¡¼­´Â IP³ª ´Ù¸¥ ÆÐŶ ±â¹Ý ±â¼ú¿¡ Ư¡ÀûÀ̳ª ÀüÅëÀûÀÎ TDM¸Á¿¡¼­´Â ³ªÅ¸³ªÁö ¾Ê´Â Áö¿¬º¯À̳ª ÆÐŶ¼Õ½Ç·Î ÃÊ·¡µÇ´Â Ç°Áú ¼Õ»ó¿¡ ÃÊÁ¡À» µÐ´Ù. ±×¸®°í ÆÐŶ ¼Õ»ó¿¡¼­ »óÈ£ÀÛ¿ë°ú Çù»óÁ¡(trade-off)À» ³íÀÇÇÏ°í À½¼º ¹× ´Ù¸¥ ÀÀ¿ë ¼­ºñ½ºÀÇ Ç°Áú¿¡ ´ëÇÑ ±×°ÍµéÀÇ ¿µÇâÀ» ÁÙÀ̱â À§ÇÑ ÁöÅͺ¹±¸ ¹öÆÛ¿Í ÆÐŶ ¼Õ½Ç Àº´Ð°ú °°Àº ¸ÞÄ¿´ÏÁòµéÀ» ±â¼úÇÑ´Ù. ±×·¯³ª º» Ç¥ÁØÀº ÇöÁ¸ÇÏ´Â Á¤ÀÇ´Â °ü·Ã Âü°í¹®ÇåÀ» ¾ð±ÞÇÏ°í Áߺ¹À» ÇÇÇÑ´Ù. º» Ç¥ÁØ¿¡ Á¤ÀÇµÈ ÆĶó¹ÌÅ͵éÀº ¸¹Àº °æ¿ì IP°èÃþÀÇ ¹üÀ§¸¦ ³Ñ´Â´Ù. ´Ü´ë´Ü ÆÐŶ(Á¾´Ü ´Ü¸»°ú ¸Á) ÆĶó¹ÌÅ͵éÀº À½¼º/À½¼º´ë¿ª Ç°ÁúÀ» Á¤Çϴµ¥ ¿ª½Ã ÇÊ¿äÇÏ´Ù. Á¦ 5, 6, 7ÀýÀº °¢°¢ ¼Û½ÅÃø ´Ü¸», ÆÐŶ¸Á, ¼ö½ÅÃø ´Ü¸»¿¡ ´ëÇÑ ÆĶó¹ÌÅ͵éÀ» Æ÷ÇÔÇÑ´Ù. ºÎ·Ï IÀº ÆÐŶ¼Õ½Ç ºÐÆ÷¿Í ÆÐŶ¼Õ½Ç ¸ðµ¨µé¿¡ ´ëÇÑ Á¤º¸¸¦ ÁØ´Ù. ºÎ·Ï II´Â ÀûÀÀÀû ÁöÅͺ¹±¸ ¹öÆÛ ¿¡¹Ä·¹ÀÌÅÍÀÇ ¿¹¸¦ º¸ÀδÙ.
¿µ¹®³»¿ë¿ä¾à The transmission of speech and other voiceband applications over packet networks brings with it new, sometimes unique forms of quality degradation. There are many existing definitions for packet network performance parameters, yet the desire to control the quality of non-elastic isochronous applications requires additional, complementary information. The purpose of this Recommendation is to define packet network and terminal performance parameters that better reflect the perceived quality of the target applications. It is largely focused on quality impairments resulting from delay variation and packet loss which are peculiar to IP and other packet-based technologies, and which do not appear in traditional TDM networks. It discusses the interactions and trade-offs among these packet impairments, and describes mechanisms such as de-jitter buffers and packet loss concealment for reducing their effects on the quality of speech and other applications. However, this Recommendation avoids overlap by making reference to existing definitions wherever possible.
The parameters defined by this Recommendation extend beyond the IP layer in many cases. Endend packet system (combination of end terminals and network) parameters are also necessary to determine the speech/voiceband quality. Clauses 5, 6 and 7 collect the parameter definitions for source terminals, packet networks, and destination terminals (with overall parameters), respectively. Appendix I provides information on packet loss distributions and packet loss models. Appendix II gives an example adaptive de-jitter buffer emulator.
±¹Á¦Ç¥ÁØ ITU-T G.1020
°ü·ÃÆÄÀÏ TTAS_IT-G1020.zip TTAS_IT-G1020.zip            

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