57C404B 控制模块

易卖工控网（www.ymgk.com）提供”57C404B 控制模块”，产品详情：品牌/厂家：其他品牌、型号：57C404B、成色：全新、货期：期货 7天内发货、保修：365天，更多产品详情就上易卖工控网。

(3)业务管理

需要为保证QoS提供一定的手段。为了保证业务的QoS，网管人员根据具体情况为用户提供一定的带宽控制能力，例如保证用户的最低接入速率，限制用户的最高接入速率等。


(4)计费管理

接入网要能够对用户进行灵活的计费，根据用户类别、使用时长、用户流量等数据进行计费。

2、固定IP，DHCP，PPPOE 3种宽带接入方式的比较

2.1用户管理和开销方面

固定IP方式：对IP地址管理不易，用户恶意更改或者尝试自行设置自己的IP地址，都会造成管理上的麻烦，增加运营商的额外开销。

DHCP方式：一方面DHCP存在较多的广播开销，对于用户量较多的城域网会造成网络运行效率下降和配置困难；另一方面，仍然无法解决用户自行配置IP地址的问题。


PPPOE：由于采用动态分配IP地址方式，用户拨号后无需自行配置IP地址、网关、域名等，它们均是自动生成，不存在用户自行更改IP地址的问题，对用户管理方便，而且PPPOE协议是在包头和用户数据之间插入PPPOE和PPP封装，这两个封装加起来也只有8个字节，广播开销很小。

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