当然,这些优点并不足以支撑双绞线“火到现在”,还有一个重要原因是:RJ45(接口)->(是双绞线与电脑相连) OSI第一层里用来互连各种机器的设备是集线器 提到集线器,就不得不提光纤: 靠着光纤,我们就不再用电来传输0/1了,而是用光。光纤的传输原理是光的全反射。 光纤通信的是哪个主要构成部分: 光纤 光发射机 ...
对于 OSI 第一层来说,这个设备就是集线器。 连接所需的设备就是用来互连多台机器的设备,例如集线器,或交换机。 集线器 (hub) 交换机 (switch) 注:集线器是 OSI 第一层(物理层)的设备。交换机则是 OSI 第二层(数据链路层)的设备。 相连的设备就是要互连的机器,例如电脑、打印机、路由器等等。 假设现在有 ...
OSI model layer 1 is home to a variety of devices used to complete the layer’s functions. Cables and connectors, for example, are a crucial part of layer 1. Cables carry electromagnetic signals, transmitting them from source to destination. In layer 1, cables used include shield twisted pai...
OSI Layer 1 - Physical Layer In the seven-layer OSI model of computer networking, the physical layer or layer 1 is the first and lowest layer. The implementation of this layer is often termed PHY. The physical layer consists of the basic networking hardware transmission technologies of a netwo...
Physical layer is the lowest layer of all. It is responsible for sending bits from one computer to another. Physical Layer of OSI Model performs a lot of functions like Representation of Bits, controlling data rate, Synchronization, line cofiguration etc
OSI物理层的主要功能在于建立和维护物理媒体之间的连接，为上层协议提供可靠的数据传输基础。具体而言，物理层的任务包括定义物理设备的连接方式、电气特性以及数据传输的规则。例如，它规定了双绞线、同轴电缆等物理介质的使用类型，以及信号传输时的电压标准。物理层关注的是原始的数据流或电气电压的处理，而...
Functions of Physical Layer The following are the functions of physical layer in the OSI Model: 1. Physical characteristics of interfaces and media It defines the characteristics of the interface between the devices and the transmission medium. It also defines the type of transmission medium. ...
The OSI model starts with the physical layer, which acts as the foundation for the other layers, all the way to the top application layer. The physical layer is the layer closest to the physical connection between devices. This layer covers a variety of devices and mediums, among them cabli...
The Physical Layer is the lowest layer in the OSI (Open Systems Interconnection) Model of computer networking and is used to transfer electrical signals that represent data from one place to another. While the Physical Layer does not represent data itsel
Layer 1: Physical ThePhysical Layeris Layer 1 of theOSImodel. Layer 1 describes units of data such asbitsrepresented by energy (such as light, electricity, or radiowaves) and the medium used to carry them (such as copper orfiber opticcables).WLANshave a physical layer, even though we can...