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¿µ¹®Ç¥Áظí Characteristics of Optical Supervisory Channel (OSC) System for Optical Transport Network
Çѱ۳»¿ë¿ä¾à º» Ç¥ÁØÀº DWDM ÀåÄ¡¸¦ ±â¹ÝÀ¸·Î ÇÏ¿© ±¸ÃàµÇ´Â ±¤ Àü´Þ¸Á (Optical Transport Network)ÀÇ ¿À¹öÇìµå ½ÅÈ£ 󸮿¡ °üÇÑ °ÍÀÌ´Ù. ±¤ Àü´Þ¸ÁÀº µðÁöƲ µµ¸ÞÀΰú ±¤ÇÐ µµ¸ÞÀÎÀ¸·Î ±¸¼ºµÇ¸ç µðÁöƲ µµ¸ÞÀο¡¼­´Â µðÁöƲ ÇÁ·¹ÀÓ³»¿¡ À¯Áöº¸¼ö ¹× ½Ã½ºÅÛ ¿î¿ë°ü¸®¸¦ À§ÇÑ ¿À¹öÇìµå ½ÅÈ£°¡ Æ÷ÇԵǾî ÀÖ´Ù. ±×·¯³ª ±¤ÇÐ µµ¸ÞÀο¡¼­´Â ±¤ÇÐÀûÀ¸·Î ¿À¹öÇìµå ½Åȣ󸮰¡ ¾î·Á¿ö º°µµÀÇ ¿À¹öÇìµå ä³Î ÀåÄ¡ (Optical Supervisory Channel)°¡ ÇÊ¿äÇÏ°Ô µÈ´Ù. º» Ç¥ÁØ¿¡¼­´Â ±¤ÇÐ µµ¸ÞÀο¡¼­ ¿ä±¸µÇ´Â ¿À¹öÇìµå ½ÅÈ£¸¦ G.872¿¡¼­ Á¤ÀÇÇÑ OTNÀÇ °èÃþÀû ±¸Á¶¿¡ µû¶ó ºÐ·ùµÇ´Â ±¤Àü¼Û±¸°£ (Optical Transmission Section) °èÃþ, ±¤ ´ÙÁß±¸°£ (Optical Multiplex Section) °èÃþ ¹× ±¤ ä³Î °èÃþ¿¡ ´ëÇÑ ¿À¹öÇìµå¸¦ Á¤ÀÇÇÏ°í ¿À¹öÇìµåÀÇ ±â´É ¹× Àû¿ë ¹æ¹ý ¹× ¿À¹öÇìµå¸¦ ¼ö¼ÛÇÏ´Â ½ÅÈ£ ÇÁ·¹ÀÓÀÇ ±¸Á¶, OSCÀÇ ±¤ÇÐÀû/Àü±âÀû Ư¼º µîÀ» ±¹³» Åë½Åȯ°æ¿¡ ÀûÇÕÇÑ ±âÁØÀ» Á¦½ÃÇÏ°í ±¹³» °³¹ß ÀåÄ¡°£ ¶Ç´Â µµÀÔ Àåºñ°£ ½Ã½ºÅÛ È£È¯¼ºÀ» À¯ÁöÇÒ ¼ö ÀÖµµ·Ï ÇÔÀÌ ±× ¸ñÀûÀÌ´Ù
¿µ¹®³»¿ë¿ä¾à This document describes an optical supervisory channel carrying OTM overheads over OTN based on the DWDM systems. The OTN has a layered network architecture which are consisted of digital domain layer and optical domain layer separately. In digital domain the network elements contain overhead bytes which are included in their own digital frames. In optical domain, there is no way to carry overhead signal to maintain the all optical network. Therefore an extra optical supervisory channel is required to perform overhead functions as that in digital domain based network elements. Accordingly, this document defines overheads related to OTN maintenance, overhead functions and applications for OTS, OMS and OCh layer recommended by G.872. Furthermore, STM-1 frame structure of OSC and some parameters for optical and electrical interface are also defined. The purpose of this recommendation is for ensuring interoperability between multi-vendor products including the non-standard abroad products
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