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H3CSE-WLAN Sample Questions:

1. 以下对室分系统描述正确的是
以下对室内分布系统合路原则描述正确的是 ______

A) 根据实测经验,在室内分布式系统中天线口的 wlan 信号功率在 10dBm 左右比较理想,最小不低于 5dBm ,一般要求 wlan AP 合路点的发射功率至少不低于 3G/GSM/CDMA 信号功率
B) 一般不建议在 AP 的后面增加 WLAN 功放
C) AP 安装位置应保证以太网可达（与接入交换机之间小于 100 米),在无 POE 交换机的情况下应保证能提供本地供电。
D) 受用户数的限制,单个 AP 所接天线数建议不超过 15 个
E) AP 合路点必须在有源设备（主要是干放)后一级,因为有源设备不能通过 wlan 信号,无馈系统的所有无线器件（包括功分器,线缆,跳线等)必须能支持 WLAN 频段（ 2.4GHZ~2.4835Ghz ),且衰减控制点在一定范围内。

2. 以上可以工作在 2.4GHz 频段的无线协议是

A) 802.11g
B) 802.11n
C) 802.11b
D) 802.11a

3. 无线故障排除常用方法有

A) 分块故障排除法
B) 分层故障排除法
C) 替换法

4. 信号干扰尽量规避的方法有

A) 频点选择上,相邻区域频点配置时务必选择 1 、 6 、 11 信道
B) 覆盖区域内已用尽信道,且考虑容量需要再部署 AP 时,可以考虑采用物理隔离避免同频干扰
C) 可以考虑选择不同类型的天线（信号空间波瓣形状不同),在空间上降低同频干扰的几率
D) 室外区域可以通过调整天线方向角来避免同信道主波瓣交汇形成干扰区

5. （单选)以下不符合轨道交通无线部署工程规范的是。

A) 线缆统一使用扎带固定,并通过指定的路线走线
B) 天线平行与轨道安装,天线安装高度与车载天线错开
C) 天线避雷针角度小于 30° ,并引入接地线,线缆长度不超过 30m
D) AP 放置在防水箱内,箱体以及各设备做好国定、散热、防水处理

Solutions: