当前应用是否没有体现出EPON和GPON差异来？
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。
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。
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
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？
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