Caption: A Proxim RangeLAN Wireless local area network interface card. Also shown is a table-top antenna which attaches to the interface card
▪ Caption: A Proxim RangeLAN wireless local area network interface card. Also shown is a table-top antenna which attaches to the interface card
Caption An AirLan wireless local area network interface card. The white rectangular object is a wall or ceiling mount antenna which attaches to the interface
▪ Caption: An AirLAN wireless local area network interface card. The white rectangular object is a wall or ceiling mount antenna which attaches to the interface
Ran Caption A Rangelan wireless local area network PCMCIA interface card the black object attached to the left of the card is its antenna
▪ Caption: A RangeLAN wireless local area network PCMCIA interface card. The black object attached to the left of the card is its antenna
Caption: A RangeLAN wireless PCMCiAnetwork interface card Attached is its wireless tranceiver and antenna
▪ Caption: A RangeLAN wireless PCMCIA network interface card. Attached is its wireless tranceiver and antenna
63局域网技术(1) 6.31信道分配 静态分配 频分多路复用FDM(波分复用WDM 原理:将频带平均分配给每个要参与通信的用户 点:适合于用户较少,数目基本固定,各用 户的通信量都较犬的情况 缺点:无法灵活地适应站点数及其通信量的变化 时分多路复用TDM 原理:每个用户拥有固定的信道传送时槽; 点:适合于用户较少,数目基本固定,各用户 缺点:无法灵活地适应站点数及其通信量的变化
6.3 局域网技术（1） 6.3.1 信道分配 - 静态分配 • 频分多路复用 FDM（波分复用WDM） 原理：将频带平均分配给每个要参与通信的用户 ；优点：适合于用户较少，数目基本固定，各用 户的通信量都较大的情况； 缺点：无法灵活地适应站点数及其通信量的变化 。 • 时分多路复用 TDM 原理：每个用户拥有固定的信道传送时槽； 优点：适合于用户较少，数目基本固定，各用户 的通信量都较大的情况； 缺点：无法灵活地适应站点数及其通信量的变化