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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 optiona
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