2.2.缩略语,AC、Access Control,List。访问控制列表,BHCA。Busy Hour,Call Attempts.忙时呼叫尝试次数 ID,Identification.身份证明、IP.Internet。Protocol,互联网协议。LPZ、Lightning,Protection。Zone.雷电防护区、MAC,Media.Access,Control,媒体控制访问,MPLS、Multi、Protocol,Label,Switching。多协议标签交换.MSTP Multi.Service,Transmission.Platform,多业务传送平台。NAT、Network,Address,Translation、网络地址转化.NTP.Network,Time。Protocol,网络时间协议,OTDR,Optical Time Domain,Reflector、光时域反射仪,PDH,Plesiochronous,Digital.Hierarchy,准同步数字系列。PTZ,Pan、Tilt,and,Zoom.control、云台操控,PRBS Pseudo,Random。Binary,Sequence,伪随机二进制序列,QoS.Quality of,Service 系统服务质量、SDH,Synchronous。Digital、Hierarchy,同步数字系列。STM,N。Synchronous,Transport,Module、level、n.同步传输模块n级,UPS,Uninterruptible,Power,Supply,不间断电源.VLAN Virtual,Local,Area、Network,虚拟局域网。VPN Virtual。Private Network、虚拟专用网