补充资料.
Signed-off-by: rick.chan <chen.yang@yuzhen-iot.com>
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# 4G 信号强度定义
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中国电信的外场测试标准如下:
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近点 SINR>=25DB,RSRP>=-85dbm;
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中点:-85dBm>RSRP>=-95dBm, SINR>=15dB;
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远点为RSRP<-95dBm
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根据中移终端外场测试规范:LTE信号点位的选择为:
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极好点: RSRP>-85dBm;SINR>25
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好点:RSRP=-85~-95dBm;SINR:16-25
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中点:RSRP=-95~-105dBm;SINR:11-15
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差点:RSRP=-105~-115dBm;SINR:3-10
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极差点:RSRP<-115dB;SINR<3
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中国联通外场测试标注定义:
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近点:RSRP=-75~-85dBm;SINR:15-25DB
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中点:RSRP=-85~-95dBm;SINR:5-15DB
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远点:RSRP=-95~-110dBm;SINR<5DB
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# Htop 简要说明
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* F1:帮助
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* F2:Htop 设定
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* F3:搜索进程
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* F4:过滤器
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* F5:以树形方式显示
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* F6:排序方式选择
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* F7:减少 nice 值,提高对应进程的优先级
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* F8:增加 nice 值,降低对应进程的优先级
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* F9:杀死进程
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* l:显示进程打开的文件
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* q:退出
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* s:选择某进程,按 s 用 strace 追踪进程的系统调用
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* H:显示或隐藏用户线程
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* I:倒转排序顺序
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* K:显示或隐藏内核线程
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* Ctrl-L:刷新
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# Microcom 简要说明
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Microcom 是一个串口终端程序。
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```bash
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# 打开串口
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mircocom /dev/ttyUSB0
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# 退出
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ctrl+x
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```
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# Telnet 测试端口连通性
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telnet命令是TELNET协议的用户接口,它支持两种模式:命令模式和会话模式,虽然telnet支持许多命令,但大部分情况下,我们只是使用它查看目标主机是否打开了某端口(默认是23)。
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其执行结果有两种:
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## 端口未打开
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```bash
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telnet 101.199.97.65 62715
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Trying 101.199.97.65...
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telnet: connect to address 101.199.97.65: Connection refused
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```
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此时,命令已退出。
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## 端口已打开
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```bash
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telnet 101.199.97.65 62715
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Trying 101.199.97.65...
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Connected to 101.199.97.65.
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Escape character is '^]'.
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```
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此时命令未退出。
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根据提示Escape character is '^]'.可知退出字符为'^]'(CTRL+])。此时输入其它字符不能使其退出,CTRL+C都不行。输入CTRL+]后会自动执行,进入命令模式:
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```bash
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^]
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telnet>
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```
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此时再运行 quit 才会真正退出。
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```bash
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telnet> quit
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Connection closed.
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```
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其中,Escape character 可以自定义,使用参数 -e:
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```bash
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telnet -e p 101.199.97.65 62715 #使用p字符
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Telnet escape character is 'p'.
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Trying 101.199.97.65...
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Connected to 101.199.97.65.
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Escape character is 'p'.
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p
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telnet> quit
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Connection closed.
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```
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@ -25,3 +25,13 @@ ggdG
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```bash
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set list
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```
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## 5.判断文件格式是 dos 还是 unix
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```bash
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set ff?
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# dos 格式
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fileformat=dos
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unix 格式
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fileformat=unix
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```
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