已解决问题
OTN的速率问题,以及净荷和开销
提问者:优质民工
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提问时间:2011-8-19 08:46
OPUK帧速率为什么是:净荷速率*238/(239-k) 这个公式就把OPUK的长度按做238*16来处理了?
那对于OPU1 不就是*238/238 ? 等于原始的净荷速率?
为体是对于238这个数字的,238在图中是:(3824-16)/16得出,而不是(3824-14)/16
但是从图上看,OPUK的帧是净荷+开销字节的,而且开销字节占明显的两行,净荷才是占用(3824-16)行的,另外的15、16行应该是开销,这样净荷+开销的3810行才是整个OPUK帧才对啊?还是说这个净荷速率*238/(239-k),里面的238其实是有小数点的?速率只是个大概范围值?
是否说明:根据K的不同,数据净荷在不同速率等级的OTN设备里,其被封装的空间大小是不同的?换句话说,在不同速率的OTN设备里,开销所占用的字符数也是不同的,这个是有别于SDH的固定开销/净荷比的?
但是所有的技术文档上画的OTN帧结构图都和上面的疑问想违背啊....
另外一点:OUUK向高介的OUUK复用时,由于帧结构大小的变化,比如一个ODU1将不止封装如4个ODU2帧中,那么对于多出来的部分数据,开销字节部分怎么核算的?在讲ODUK 向高介复用时,资料上说的都很模糊。
OPUK的帧速率的算法还是有一点问题,楼上说的我基本同意,其实应该是有小数点的,个人认为,前14列和15 16列均为开销,为了计算方面,将前16列均看成了开销。计算成了16/16=1,17至2824,3808/16=238,FEC计算成,256/16=16;这样算是不是比较简单,如果孤零出现个14或238.125不好计算。
ODU1到ODU2的复用,实际是调整速率的过程,发送帧的长度是固定的,与K无关。一般是不跨级复用,不用增加FX固定填充,跨级复用需要增加固定填充字节,16位。
个人的意见,欢迎指正。
ODU1到ODU2的复用,实际是调整速率的过程,发送帧的长度是固定的,与K无关。一般是不跨级复用,不用增加FX固定填充,跨级复用需要增加固定填充字节,16位。
个人的意见,欢迎指正。
回答时间:2011-8-19 19:38
此答案得到7次回应
如果是小数点,只能说明OPU1,因为到OPU2:是*238/237,OPU3:是*238/236,每级都少了一个16列去了,不是OPU1里的2列....
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