I. Overview
As its name implies, Hub is the activity center. In network terms, the Hub or Concentrator is a wiring point based on a star topology. Arcnet, 10Base-T, 10Base-F, and many other dedicated networks rely on hubs to connect each segment of cables and distribute data to each segment. The basic function of a hub is information distribution, which distributes all signals received by a port to all por
the 10BASE-5 network via a coarse coaxial cable transceiver, but more often with an external transceiver (AUI-TO-RJ-45), to connect to the 10BASE-T Ethernet network. Connections to fine coaxial (10base-2) or optical cables (10BASE-F) can also be implemented with the aid of other types of transceivers. The router AUI i
At present, the construction of intelligent community has gradually become a hot topic, and the construction of data network will become an important part of intelligent community construction. At the same time, the intelligent and networked residential district will bring new market opportunities to the developers of the community.
For intelligent community Construction, 3Com according to the different operating environment and user requirements, the following solutions are proposed:
Intellig
star network, mainly refers to the logical topology structure of the network. However, in practical applications, the physical topology of all these networks is usually a star-shaped connection, and the star connection has more flexibility when connecting users to the network. This advantage becomes more pronounced when the system is evolving or the system has undergone significant changes. The star shape, the total linear and the ring network all have their own characteristics, and the final c
repeater to expand the topological distance of the network. This is because signal attenuation occurs after long-distance transmission. The function of a repeater is to sort out the signals that have been degraded and become incomplete, re-generate a complete signal and continue transmission. A repeater is the predecessor of a general hub. A hub is a multi-port repeater. Take the hub in Figure 1 as an example. A hub generally has a BNC connector, an AUI connector, and an RJ45 interface ranging
I. router interface
A vro has powerful network connection and routing functions. It can be physically connected to a variety of different networks, which makes the router interface technology very complex, the more upscale a router has more interface types, because the more network types it can connect. Vro ports include LAN ports, WAN ports, and configuration ports.1. LAN interface
Common Ethernet interfaces include AUI, BNC and RJ-45 interfaces, as well as FDDI, ATM, Gigabit Ethernet and so on
interface
Common Ethernet interfaces include AuI, BNC and RJ-45 interfaces, as well as FDDI, ATM, Gigabit Ethernet and so on all have corresponding network interfaces, the following describes the main LAN interfaces.
(1). AuI PortThe AuI port is the interface used to connect to the coarse coaxial cable. It is a "d" Type 15-pin interface, this is one of the most common ports in the ring or bus network. The router can connect to the 10base-5 network th
Port
The AuI port is the interface used to connect to the coarse coaxial cable. It is a "d" Type 15-pin interface, this is one of the most common ports in the ring or bus network. The router can connect to the 10base-5 network through a coarse coaxial cable transceiver. But more is the use of external transceiver (AUI-to-RJ-45), to achieve the connection with the 10base-t Ethernet. Of course, you can also
used normally, the general router has a control port "console ", it is used to connect to a computer or terminal device and configure a router through specific software. Next, let's take a look at the router's LAN and WAN connection ports.
1. LAN interface
According to the interface name, we can see that these interfaces are mainly used to connect routers and LAN, because the LAN type is also diverse, therefore, the LAN interface type of the router may be diverse. Different networks have di
connect to the coarse coaxial cable. It is a "d" Type 15-pin interface, this is one of the most common ports in the ring or bus network. Vro accessibleThe coarse coaxial cable transceiver is connected to the 10base-5 network. However, it is more with the help of external transceiver (AUI-to-RJ-45), to achieve
Network connection. Of course, you can also use other types of transceiver to connect to a fine coaxial cable (
Fast Link pulse
Auto-negotiation takes place using fast
Link pulse (random) signals. these signals are a modified version of the normal link pulse (NLP) signals used for verifying link integrity, as defined in the original 10base-t specifications. the specified signals are generated automatically at power-up, or may be
Selected manually through the management interface to an auto-negotiation device.
The Fast Link pulse signals are designed to coexist
Ethernet (EtherNet)Originally created by Xerox, the Ethernet was developed jointly by DEC, Intel and Xerox three companies in 1980 as a standard. Ethernet is the most widely used local area network, including standard Ethernet (10Mbps), Fast Ethernet (100Mbps), Gigabit Ethernet (Mbps), and 10G Ethernet, all conforming to the IEEE802.3 Series standard specification.(1) Standard EthernetThe first Ethernet only has a 10Mbps throughput, and it uses the access control method of the CSMA/CD (carrier-l
through specific software. Next, let's take a look at the router's LAN and WAN connection ports.1. LAN interfaceAccording to the interface name, we can see that these interfaces are mainly used to connect routers and LAN, because the LAN type is also diverse, therefore, the LAN interface type of the router may be diverse. Different networks have different interface types. Common Ethernet interfaces include AUI, BNC and RJ-45 interfaces, as well as FDDI, ATM and optical fiber interfaces, the fol
the coarse coaxial cable. It is a "D" Type 15-pin interface, this is one of the most common ports in the ring or bus network. The router can connect to the 10Base-5 network through a coarse coaxial cable transceiver. But more is the use of external transceiver AUI-to-RJ-45), to achieve the connection with the 10Base-T Ethernet. Of course, you can also use other types of transceiver to connect to the 10 bas
extent
Computers and troubles
The slow speed problem is basically solved. But why can't I connect to each other after I add some computers?
Figure 3 incorrect connection method.
The reason is simple. To connect an added computer to the network, a new set line device must be added. Unfortunately, Lao Zhang still uses a hub and connects 4th hubs in cascade mode (as shown in 3). This violates the 5-4-3 rule of 10Base-T, network Communication fails. The
of the copper core twisted-pair cable with optical cable.(6) Integrated Cabling System standardNow, the general wiring in the reference system cabling standards, generally from the following standard system start: the Americas standards, European standards, international standards and application standards.A) North American standard Ansi/tia/eia568-b.b) ansi/tia/eia568-b.1,ansi/tia/eia568-b.2,ansi/tia/eia568-b.3.c) International standard ISO/IEC 11801d) China standard gb/t50311-2000 and gb/t503
Control Message Protocol ICMP
Routing protocol for Internet
IP Multicast and Internet Management Protocol
Next-generation Internet Protocol Ipv6
Knowledge points three, LAN and WAN
LAN Overview
LAN topology
Traditional Ethernet
Virtual Local Area Network
High-speed Ethernet and other types of high-speed LANs
Wireless LAN
The development and working principle of Ethernet
10Base Networking Essentials and 4 types of
Vro interfaces are very important for network connection and routing functions. Here we will give a comprehensive explanation of vro interfaces and connection knowledge. A vro has powerful network connection and routing functions. It can be physically connected to a variety of different networks, which makes the router interface technology very complex, the more high-end router interfaces there are, the more network types it can connect. Vro ports include LAN ports, WAN ports, and configuration
4) In housfe-series video panelThe In HouseTM series video panel allows you to easily integrate cable TV, satellite TV, security, and other systems throughout the home. The video panel is integrated with PCB technology, which improves the operation quality and enables the built-in Process Control Panel to output video signals of high definition to the maximum extent. For the video service of the In HouseTM series video panel, see table 6. Video Service of In HouseTM series video panelTable 6 Li
. Powerpctm structure processor consists of three modules: powerpctm kernel, System Interface Unit (SIU), and communication processor module (CPM ). All three modules adopt a 32-bit internal bus. The master processor of the MPC860 is a 32-bit powerpctm kernel that enables memory management (MMU) and command and data caching. In the system interface unit of the MPC860, the memory control unit supports a variety of high-performance memory, including SDRAM and flash, as well as a PCMCIA controller
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