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¿µ¹®Ç¥Áظí A MODEM OPERATING AT DATA SIGNALLING RATES UP TO 28800bit/s FOR USE ON THE GENERAL SWITCHED TELEPHONE NETWORK AND ON LEASED POINT-TO-POINT 2-WIRE TELEPHONE TYPE CIRCUITS
Çѱ۳»¿ë¿ä¾à »ç¿ë ¸ðµ©ÀÇ Æ¯Â¡Àº ù°, ÀÏ¹Ý ±³È¯ ÀüÈ­¸Á ¹× 2¼±½Ä Àü¿ëȸ¼±¿¡¼­ µàÇ÷º½º¿Í ¹ÝµàÇ÷º½º µ¿ÀÛÀ» Áö¿øÇÑ´Ù´Â Á¡, µÑ° ¿¡ÄÚ Á¦°Å ±â¼ú¿¡ ÀÇÇÑ Ã¤³Î ºÐ¸®, ¼Â° ¼±Åð¡´ÉÇÑ ½Éº¼ ºñÀ²»ó¿¡¼­ µ¿±â¶óÀÎ Àü¼ÛÀ» °¢ ä³Î¿¡¼­ Áö¿øÇÏ´Â QAM, ³Ý° 2400bit/s~33600bit/sÀÇ µ¿±âÈ­µÈ µ¥ÀÌÅÍ ½ÅÈ£ ¼Óµµ¸¦ Á¦°øÇÑ´Ù´Â Á¡, ´Ù¼¸Â° ¸ðµç µ¥ÀÌÅÍ ½ÅÈ£ ¼Óµµ¿¡ ´ëÇؼ­ Æ®·¼¸®½º ÄÚµùÀ» Áö¿øÇÑ´Ù´Â Á¡, ¿©¼¸Â° µ¥ÀÌÅÍ ½ÅÈ£ ¼Óµµ¸¦ È®¸³Çϱâ À§ÇØ ½ÃÀÛ ½Ã±âµ¿¾È ¼Óµµ ±³È¯À» Áö¿øÇÑ´Ù´Â Á¡ÀÌ´Ù.
¿µ¹®³»¿ë¿ä¾à The principal characteristics of the modem are as follows: a) duplex and half-duplex modes of operation on GSTN and point-to-point 2-wire leased circuits; b) channel separation by echo cancellation techniques; c) Quadrature Amplitude Modulation (QAM) for each channel with synchronous line transmission at selectable symbol rates including the mandatory rates of 2400, 3000, and 3200 symbols/s and the optional rates of 2743, 2800 and 3429 symbols/s; e)trellis coding for all data signalling rates; f) an optional auxiliary channel with a synchronous data signalling rate of 200 bit/s, a portion of which may be provided to the user as an asynchronous secondary channel g)adaptive techniques that enable the modem to achieve close to the maximum data signalling rate the channel can support on each connection; h) exchange of rate sequences during start-up to establish the data signalling rate; i) automoding to V-Series modems supported by V.32 bis automode procedures and Group 3 facsimile machine.
±¹Á¦Ç¥ÁØ ITU-T V.34
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Á¦Á¤ 1996-12-20 TTAS.IT-V34
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