銆�銆�鏁�(sh霉)瀛楃▼鎺�浜ゆ彌姗�鏄竴绋埄鐢ㄨ▓绠楁鎶�琛撴帶鍒堕浕瑭辨帴绾�(x霉)鐨�闆昏┍浜ゆ彌閫氫俊瑁濈疆銆傛暩(sh霉)瀛�绋嬫帶浜ゆ彌姗�浠ュ叾鎬ц兘鍎�(y艒u)瓒娿�佹妧琛撳厛閫�锛屼笉鍍呭彲浠ヤ氦鎻涜┍闊充俊鎭紝閭勫彲浠ヤ氦鎻涙暩(sh霉)鎿�(j霉)淇℃伅锛屽凡缍�(j墨ng)鍦ㄧ稖鍚堟キ(y猫)鍕欐暩(sh霉)瀛楃恫(w菐ng)鐨勬柟鍚戠┅(w臎n)姝ョ櫦(f膩)灞曚腑銆�
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銆�銆�鏁�(sh霉)瀛楃▼鎺т氦鎻涙绯荤当(t菕ng)鏄敱鍒嗘暎鐨勫悇绋姛鑳� 妯″绲勬垚鐨�.姣忓�嬫ā濉婂叿鏈夊悇鑷殑铏曠悊姗�,鍚勫�嬫ā濉婅檿鐞嗘鍦ㄦ暣鍊嬬郴绲�(t菕ng)涓檿浜庡悓涓� 绱氬垾,鍙互鐩稿皪鐛ㄧ珛鍦板畬鎴愪竴閮ㄥ垎鍔熻兘.鍏朵腑瀹屾垚妯″闁撻�氫俊鍜岃┍璺氦鎻涚殑浜ゆ彌缍�(w菐ng) 绲�(SNM)鍜屾秷鎭垎閰嶇恫(w菐ng)(MDM)绲勬垚浜掕伅(li谩n)缍�(w菐ng)绲�,鏄暣鍊嬬郴绲�(t菕ng)鐨勬牳蹇冮儴鍒�;鍚勬ā濉婅檿 鐞嗘閫氶亷绯荤当(t菕ng)鐨勬秷鎭垎閰嶇恫(w菐ng),鍌抽仦鍚勭ó淇℃伅(鍖呮嫭鍛煎彨,瑷堣不,缍淇℃伅).
銆�銆�MDM 鍜� SNM 鏄郴绲�(t菕ng)涓悇绋秷鎭殑闆嗘暎鍫存墍, 閫氶亷娑堟伅鍒嗛厤缍�(w菐ng)瀹屾垚妯″闁撶殑鍗�(xi茅) 浣�,閫茶�岄仈鍒版暣鍊嬬郴绲�(t菕ng)鐨勫崝(xi茅)瑾�(di脿o);閫氶亷浜ゆ彌缍�(w菐ng)绲℃ā濉婂畬鎴愬悇澶栧湇妯″闁撹獮闊虫秷鎭殑浜� 鎻�,瀹屾垚瑭辫矾鐨勬帴绾�(x霉).澶栧湇妯″鍙互鐩稿皪鐛ㄧ珛鍦板畬鎴愪竴閮ㄥ垎鍔熻兘鐨勮檿鐞�,澶栧湇浜ゆ彌 妯″鍙互鐛ㄧ珛鍦伴�茶鍛煎彨鐨勮檿鐞�,鐣跺懠鍙秹鍙婂埌鍏朵粬鐨勬ā濉婃檪,鍙互閫氶亷娑堟伅鍒嗛厤 妯″鍚戞湁闂滅殑妯″鐧�(f膩)鍑鸿珛姹傚崝(xi茅)浣滅殑娑堟伅;濡傛灉瑕佸鍔犳柊鐨勫姛鑳�,鍙渶澧炲姞鏂扮殑鍔熻兘 妯″,骞剁敱 SNM 鎻愪緵鐩告噳鐨勪氦鎻涢�氳矾,瑭叉ā濉婄殑鎺ュ彛鍙绗﹀悎妯″闁撶殑鎺ュ彛妯欐簴灏� 鑳芥柟渚跨殑鎺ュ叆,閬斿埌澧炲姞鏂板姛鑳界殑鐩殑,鑰屾暣鍊嬬郴绲�(t菕ng)鐨勭祼(ji茅)妲�(g貌u)涓嶉渶瑕侀�茶瑾�(di脿o)鏁�.
銆�銆�绋嬫帶鏁�(sh霉)瀛椾氦鎻涙澶氭ā濉婄郴绲�(t菕ng)绺介珨绲�(ji茅)妲�(g貌u)濡傚湒鎵�绀�:鎿嶄綔缍妯� 濉�(OMM),娑堟伅鍒嗛厤妯″(MDM),浜ゆ彌缍�(w菐ng)绲�(SNM)绲勬垚涓績妯″,鏄� 鏁�(sh霉)瀛楃▼鎺т氦鎻涙绯荤当(t菕ng)瑭辫矾, 娑堟伅鐨勪氦鎻涘牬鎵�; 閫氶亷 SNM 鎿村ぇ浜嗕氦鎻涚恫(w菐ng)绲＄殑瀹归噺, 閫氶亷 MDM 绨″寲浜嗗鍊� MP 闁撶殑閫� 淇�,閫氶亷 OMM 瀵︾従(xi脿n)绯荤当(t菕ng)鐨勯泦涓董璀峰姛鑳�.
銆�銆�1) 浜ゆ彌缍�(w菐ng)绲℃ā濉�(SNM)
銆�銆�SNM 鐐哄骞抽潰绲�(ji茅)妲�(g貌u),涓�鑸敱 8 鍊� SNET 骞抽潰妲�(g貌u)鎴�,瀹屾垚 PSM 涔嬮枔鐨勮┍璺氦鎻�.SNET 姣忓�嬪钩闈㈤噰鐢� 2K脳2K 鐨� T 浜ゆ彌缍�(w菐ng)(鍚� PSM 浜ゆ彌缍�(w菐ng)). 姣忓�� PSM 鐨勬瘡濉� TNET 鐨� (HW0锝� HW13)14 姊� HW 鍜� SNM 鐩搁��;鍥犵偤姣忓�� PSM 鏈� 2 濉� TNET,鎵� 浠ュ叡 28 姊� PCM HW 鑸� SNM 鐩搁��;骞冲潎鍒嗛厤鑷� 8 鍊� SNET 骞抽潰涓�銆�
銆�銆�鍙,SNM 鏈� 8 鍊� SNET 骞抽潰鏅�,鏈�澶氬彲甯� 64/4=16 鍊� PSM,姝ゆ檪,绯荤当(t菕ng)瀹归噺瓒呴亷 5 钀敤鎴剁窔, 鍙豢瓒冲ぇ澶氭暩(sh霉)鐢ㄦ埗鐨勯渶姹�. 鏍规摎(j霉)瀵﹂殯鐨勯渶瑕佸彲浠ュ皪 S 缍�(w菐ng) HW 绶氱殑閫ｆ帴闂滅郴 閫茶瑾�(di脿o)鏁�,浣垮鍦嶆ā濉婃暩(sh霉)澶氶仈 26 鍊�,瑭宠鍚庡崐閮ㄥ垎鐨勬晿杩�.
銆�銆�2)娑堟伅鍒嗛厤妯″(MDM)
銆�銆�MDM 鏄�ｆ帴鍚勬ā濉婅檿鐞嗘(MP)鐨勯�氫俊缍�(w菐ng)绲�.瀹冪敱娑堟伅鍒嗛厤缍�(w菐ng)绲″拰铏曠悊姗�(MP)绲� 鎴�.MDN 鐢卞叐濉� 2K脳2K 鐨� NET 鏉挎(g貌u)鎴�(鑸� PSM 鐨� TNET 鐩稿悓).NET 鏉跨偤鍗婂浐瀹氶�ｆ帴,鍏堕�ｆ帴 闂滅郴鍙敱铏曠悊姗熷垵濮嬪寲纰哄畾鎴栫敱浜烘鍛戒护淇敼. 姣忓�� PSM 鏈夊叐姊� PCM 鍒嗗垾閫ｈ嚦鍏╁�� NET 骞抽潰涓�,浠ユ彁楂橀�氫俊鍙潬鎬�.鍦� 64 鍊嬪鍦嶆ā濉婄殑鎯呮硜涓�,浠绘剰鍏� 鍊嬪鍦嶆ā濉婁箣闁撴湁 1 姊� 64Kb/s 閫氳矾(1 鍊嬫檪闅�).鍦� 32 鍊嬪鍦嶆ā濉婁互涓�,涓�鍊� MDM 灏卞彲浣夸换鎰忓叐鍊嬪鍦嶆ā濉婁箣闁撴湁 2 姊� 64Kb/s 閫氳矾.
銆�銆�3锛夊悓姝ュ畾鏅傛ā濉�(STM)
銆�銆�STM 鐢� 1 濉� SYC 鍜屽叐濉� SYZ 妲�(g貌u)鎴�,寰炰笂绱氬眬鐛插彇鍩烘簴鏅傞悩缍�(j墨ng)閹栫浉鍚�,鐐哄悇 PSM,SNM, MDM 绛夋彁渚涘悓姝ュ畾鏅備俊铏�
銆�銆�4) 閬犵妯″鎺ュ彛(RIM)
銆�銆�RIM 鐢� MPMP 鍜� DT 鏉挎(g貌u)鎴�.姣忓�� RIM 鑸� RSM 鏈� 4 姊濅腑绻奸浕璺�.MPMP 鏉垮皣渚嗚嚜 MDM 鐨� 涓�姊� 2Mb/s 娑堟伅,缍�(j墨ng)閬庡绺悗鍐嶉�氶亷 DT 鐨勪竴姊� 64Kb/s 鐨勯張璺櫦(f膩)閫佸埌 RSM,灏� RSM 渚嗙殑 64Kb/s 娑堟伅鏍规摎(j霉)鐩鍦板潃鎻掑叆鍒扮浉鎳夋檪闅欎腑,缍�(j墨ng)瑙ｅ绺悗鎴愪竴姊� 2Mb/sPCM 淇� 鎭暩(sh霉)鎿�(j霉)鐧�(f膩)鍒� MDM,鍐嶇稉(j墨ng) MDM 鍒嗛厤鍒扮浉鎳夌殑 PSM.鍚屾檪閬犵妯″鎺ュ彛灏� RSM 渚嗙殑 4 姊� PCM 閫ｈ嚦 SNM,浠ュ畬鎴� RSM 鑸囧叾浠� PSM 鐨勮┍璺帴绾�(x霉)
銆�銆�5) 鎿嶄綔鑸囩董璀锋ā濉�(OMM)
銆�銆�OMM 瀹屾垚澶氭ā濉婄殑鎿嶄綔缍鍔熻兘:瑷堣不,鏁�(sh霉)鎿�(j霉)缍,瑭卞嫏绲�(t菕ng)瑷堝拰娓│绛�.瀹冪敱涓�灏� 涓诲倷鐢� MP 妲�(g貌u)鎴�,SNM 鐨勬帴绾�(x霉),MDM 鐨勫崐鍥哄畾閫ｆ帴鎺у埗,STM 鍜� RIM 涓殑 DT 鐨勭鐞嗙瓑 涔熺敱閫欏皪 MP 閫氶亷 MPPP 閫氫俊鏉垮畬鎴愩��
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