已解决问题
当前应用是否没有体现出EPON和GPON差异来?  (进入论坛模式)
提问者:xjwlmq   |  提问时间:2009-6-15 10:42
我一直疑惑,现在EPON的FTTB模式好像用处不大,选EPON、GPON甚至点对点GE口都没有关系,我接触几个公司的设备,上行都可以另外选配成GE口、GPON口、EPON口。

在实际应用中,EPON也是一个固定带宽分配,每个ONU只分配一个固定的带宽值,所谓的动态带宽分配根本就没有用起来,一个感觉,对每个ONU来说,相当于EPON就是一个小一号的GE口,又比FE大一点。

在我们国家,好像点对点GE口方式的楼道交换机(也可以叫FTTB)有1千多万线了,现在的EPON FTTB与之相比也没有什么区别,所以还不如选GE的FTTB,成本更便宜。

困惑之处,请各位专家解惑。
关闭所有答案回应     最佳答案
动态带宽分配,只有在网络拥塞时才能看到影响!如果哪天PON设备在网络上使用像现在的ADSL到了周末卡的那个时候,DBA也就发挥了它应有的效应了。但是目前的使用中,一般一台设备都使用不到1G的带宽了,而且PPPOE拨号还有带宽限制,要是EPON/GPON设备已上现网就马上能达到拥塞,能看出DBA的效果来的话,那还用这个新设备干啥呢?这也就是因为现在没有杀手级的业务应用,才说PON设备带宽剩余。
 |  回应该答案 (0)  |  回答时间:2009-6-15 19:27
其他答案 ( 11 条 )
投资是考虑长远发展的
1、业务的最终是用户侧发起,动态分配带宽,这也是未来运营商增值业务的一项,不过消费水平还不到位
2、引入PON只要考虑到日后的升级,虽然现在成本高了点,但日后的升级投资相对就少了
其实现在理论和实际相差很远,就像3G,成本高导致资费高,资费高用户需求就不多,收入就上不来,所以像PON的动态分配带宽就没法运营
 |  回应该答案 (0)  |  回答者:传输   |  2009-6-15 10:49
我感觉就FTTH方式而言,PON相比大容量交换机的P2P方式没有什么优点。PON的分光看似节省光纤,但是实际使用上还是需要布放很多纤芯的,每个分支不可能只布1芯,1芯光缆怎么敷设?
 |  回应该答案 (3)  |  回答者:tly_0309   |  2009-6-15 11:49
该答案得到 3 个回应   我要回应
118.249.111.*  |  2011-11-11 11:23
abendkleider Tee Should you feel somewhat normal Tee powerful colour, as opposed to pocket 1st tee Pocket Tee should supply you an enormous scorching an individual far more selection. Present road shooting, abendkleider bestellen appealing actress Megan Monk likes to hefty pockets Tee, brautkleider a whole lot of road shooting all a variety of colours to watch her appear. schwanger heiraten Recently, ultra red followers Robert Pattinson could it be Also! Tee who's also burnt inside the place star if you will the Utilized up Tee Initially tee burned physique inside the celebrities using the fashion within an excellent despite the fact that. Burned Tee Burn off out Tee cloth shed simply because the basic texture is clear abendkleider online shop , as a result place on any burning must spend concentrate backing Tee with underwear. ballkleid verleih Drew Barrymore mainly
220.169.8.*  |  2011-11-25 19:33
uggs boots as materials for wedding ceremony gowns is generally quite high priced and employing much less materials, ugg ultra short boots sensibly, tends to make to get a a lot more economical gown. UGG Classic Short Boots Red If you are a summer season bride, you might be thankful for heading brief, as these attire are understandably much less scorching to put on. As a lot of people do opt for the summer time time to obtain hitched, UGG Classic Tall Boots Camo Brown UGG Infant's ErChestnut an airy, breezy gown appears an clear selection. Detachable marriage ceremony gowns provide you with the top of each worlds: UGG Bailey Button Boots Grey a glamorous floor duration gown, after which immediately after you've got taken off the decrease portion in the glamorous skirt it is going to make for an straightforward comfy gown for dancing and acquiring about. And withstanding the warmth and also the pressure. Tea size gowns go well with essentially just about every extra wide boots
118.250.10.*  |  2012-3-2 11:58
area, brides dressbrides dress maxi white dressmaxi white dress my black mini dressmy black mini dress softly push till ultimately the reverse clicks in to the view cover.Replica watches might be identified the lowprice copies of preferred namebrand watches. These watches are located for offering by road suppliers and in tiny stores all through the globe. Given that these watches are not the authentic item, cheap wedding dressescheap wedding dresses there does exist no manufacturer's assure. In the event the replica view sheds time or ceases performing the task, there's barely any that even a jewellery or view store can execute to alter the piece gold sequin dressesgold sequin dresses . But 1 can discover just a couple of factors that's feasible in 1 location.Upgrading a Wornout WatchbandGet the watchband wall mounts on every facet in the view situation. The watchband is locked in area with spring bars. vintage bridesmaid dressesvintage bridesmaid dresses Each and every little springloaded bar squeezes into lugs on each sides in the watchband bracket.Insert the spring bar instrument in to the crevice in in between the
PON 适合中长距离的传输。。且组网灵活。。。方便升级。。。。。。。是否有人考虑到多运营商在接入层共用光纤呢。。。哈哈。。。。。

到终端的那段距离。。。。。
 |  回应该答案 (0)  |  回答者:lxffcc   |  2009-6-15 14:04
学习
 |  回应该答案 (0)  |  回答者:xboxerman   |  2009-6-15 20:02
站楼学习
 |  回应该答案 (0)  |  回答者:liuwm   |  2009-6-15 22:28
PON系统现在在中国真正的应用根本就没有开始。经济水平也没有达到呀。武汉整天忽悠说上FTTH,你去看看实际的情况就知道了
 |  回应该答案 (0)  |  回答者:kilelook   |  2009-6-15 23:54
FTTH上不起。。。目前情况FTTB还是比较好的选择。。。。。。针对用户给方案。。。。人又穷富之分。。。。。市场有高低之分。。。。。
 |  回应该答案 (0)  |  回答者:lxffcc   |  2009-6-19 11:39
学习一下,,,,,,,,,,
 |  回应该答案 (0)  |  回答者:whhenyuan   |  2009-6-24 14:54
其实就我目前做的关于PON的设计来看,所谓的先进性我是没有看出来,实际上施工的难度真的蛮大的,刚开始简直是一团糟,特别在一些旧小区,什么沈的安装位置,取电啊、接地啊,关于此类的问题好多啊,而且那个光缆的损耗要比厂家宣传的搞出很多:Q
 |  回应该答案 (0)  |  回答者:lnpdit_ycs   |  2009-8-24 17:08
楼主没有分清楚PON和点到点最基本的区别:
节约光纤
节约光模块
如果不考虑这方面的节约,点到点当然要比PON好:安全,带宽大;
 |  回应该答案 (0)  |  回答者:stocklover   |  2009-9-7 17:02
PON的动态分配带宽只有网络拥塞时才能看出效果来。
回应该答案 (0)  |  回答者:张延考   (技术员二级)  |  2011-8-12 08:21
热点问题