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(1) PDH光端機(jī)與SDH光端機(jī)有什么不同?在數(shù)字傳輸系統(tǒng)中.有兩種數(shù)字傳輸系列.一種叫"準(zhǔn)同步數(shù)字系列"簡(jiǎn)稱PDH,另一種叫"同步數(shù)字系列"簡(jiǎn)稱SDH.PDH(準(zhǔn)同步數(shù)字系列)光端機(jī)是小容量光端機(jī).一般是成對(duì)應(yīng)用.叫點(diǎn)到點(diǎn)應(yīng)用.容量一般為4＊E1.8＊E1.16＊E1.SDH…
2024-6-18 18:26:39[未知IP0801]網(wǎng)友
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2024-6-18 13:56:17[未知IP0801]網(wǎng)友
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2024-6-18 4:56:27[未知IP0801]網(wǎng)友
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2024-6-17 15:24:48[未知IP0801]網(wǎng)友
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2024-5-26 4:07:40[未知IP0801]網(wǎng)友
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2024-5-25 23:37:49[未知IP0801]網(wǎng)友
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2024-5-2 12:38:19[未知IP0801]網(wǎng)友
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2024-5-2 8:08:24[未知IP0801]網(wǎng)友
海瀾之家歐洲杯h(huán)ttp://www.sztspi.com/user/296914 http://www.sztspi.com/user/57678 http://www.sztspi.com/user/491610 http://www.sztspi.com/user/143812 http://www.sztspi.com/user/29429
2024-5-2 3:38:31[未知IP0801]網(wǎng)友
歐洲杯意大利與西班牙解析http://www.sztspi.com/user/62568 http://www.sztspi.com/user/166818 http://www.sztspi.com/user/582311 http://www.sztspi.com/user/53339 http://www.sztspi.com/user/766811
2024-5-1 23:08:47[未知IP0801]網(wǎng)友
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2024-5-1 12:18:23[未知IP0801]網(wǎng)友
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