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光端機(jī)里的E1 口是什么意思?歐洲的30路脈碼調(diào)制PCM簡(jiǎn)稱E1,速率是2.048Mbit/s 。 我國(guó)采用的是歐洲的E1標(biāo)準(zhǔn)。 E1的一個(gè)時(shí)分復(fù)用幀(其長(zhǎng)度T=125us 即取樣周期125微秒)共劃分為32相等的時(shí)隙,時(shí)隙的編號(hào)為CH0~CH31。其中時(shí)隙CH0用作幀同步用,時(shí)隙CH16用來傳送信令,剩下…
2024-6-18 16:05:54[未知IP0801]網(wǎng)友
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2024-5-2 10:17:52[未知IP0801]網(wǎng)友
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2024-5-2 1:17:55[未知IP0801]網(wǎng)友
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2024-5-1 20:48:23[未知IP0801]網(wǎng)友
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