APPENDIX APPENDIXLocal Ethernet Bridge LB1000 LAN Interface each port IEEE 802.3 AUI or optional Thin Ethernet BNC Connectors Dimensions 42.5 x 38 x 7.2 cm ( W x D x H ) Power 110/230 Volts, 0.5Amps, 45 Watts Environmental Operating Temperature: 10 o to 40 o C Humidity: Up to 90% (non condensing) Performance Filtering: 25.000 PPS Forwarding: 10.000 PPS System Configuration - Main board - 2 Ethernet Controllers OPTIONS - up to 4 Ethernet Controllers Local Ethernet Bridge RB1000 LAN Interface each port IEEE 802.3 AUI or optional Thin Ethernet BNC Connectors Telecommunic.Interface RS232C Dimensions 42.5 x 38 x 7.2 cm ( W x D x H ) Power 110/230 Volts, 0.5Amps, 45 Watts Environmental Operating Temperature: 10 o to 40 o C Humidity: Up to 90% (non condensing) Performance Filtering: 25.000 PPS Forwarding: Dependent on link speed Greater than 90% of link capacity System Configuration - Main board - Ethernet Controller OPTIONS - up to 2 Ethernet Controllers - up to 4 Ethernet Controllers - High speed Communication Controller - Dial up
Ordering Instructions *RB1000 x x x | | |_____Number of Ethernet Connections | |_________Number of Serial or X.25 Connections |_____________Type of Connection - O - Serial Async. Connection - H - HDLC (up to 64kb) Serial Connection - X - X.25 Connection
*Connection Options *Number of Connections Ethernet - AUI+Thin - Ethernet 1-2 - AUI+Thick - Serial 1-4 - 10BaseT - X.25 1
GLOSSARYApplication Layer - The seventh and highest layer of the Open Systems Interconnection data communication model of the International Standards Organization. This layer supplies functions to applications or nodes by allowing them to communicate w other applications or nodes. File transfer and electronic mail work at this layer.
Bps - Abbreviation for bits per second, measure of transmission speed.
Bridge - Equipment which connects different LANs, allowing communications between devices on separate LANs, as in "to bridge" several LANs. Bridges are protocol independent, but hardware specific.
Data Link Layer - The second layer of the Open System Interconnection data communication model of the International Standards Organization. It is level that puts messages together and coordinates their flow. See OSI model.
Dynamic Routing - A way to route messages through a network. If one route is disabled or too busy, another route is chosen automatically. This saves time and money, since the network picks the best available route for the message to travel. The routing i one dynamically: as conditions change, the route changes. Static routing is where all the routes are preprogrammed.
Ethernet
- A CSMA/CD 10M bit-per-second network utilizing coaxial cable, developed at
Xerox's Palo Alto Research Center, Palo Alto , CA. One of the most popular baseband LANs in
use.
DEC and Intel participated with Xerox to make Ethernet a network standard that provides
computers with network access on a transmit-at-will basis. If two transmissions collide, they wait
and try again until they get through.
File Server - A computer containing the files, which are shared by everyone connected to a LAN. In some LANs the device is a PC. In other LANs, this device is a special computer with a disk drive and specialized software. In still other LANs, any PC can be a file server, depending on the software it runs. File servers can offer all types of resources, from simple data storage to gateways and protocol conversion. File server usually has software rules allowing LAN users to get into and out of the files and databases stores. There are also software rules for the other devices, such as serial and gateway ports, that a file server shares.
Frame - A group of bits sent over a communication channel, usually containing its own control information, including address and eRR2000etection. The exact size and make-up of a frame depends on the protocol used. The terms frame and packet are often used interchangeably.
Gateway - A computer system and its software that permit two networks using different protocols to communicate with each other. Common gateways hook PC-based LANs into IBM mainframes (SNA gateways) or to X.25 packet-switched public network systems (X.25 gateways).
Header - That part of a message, at the beginning of a frame, which contains destination address, source address, message numbering, and possibly other information. It helps direct the message along its journey.
IEEE - Abbreviation for the Institute of Electrical and Electronic Engineers, a publishing and standards-making body responsible for many standards used in LANs, including the 802 series
IEEE 802.2 - A data link layer standard used with the IEEE 802.3, 802.4 and 802.5 standards. It defines how the basic data connection over the physical cable should be established.
IEEE 802.3 - A physical layer standard specifying a LAN with a CSMA/CD access method on a bus topology. Ethernet and Starlan both follow subsets of the 802.3 standard.
Interface - A demarcation between two devices, where the electrical signals, connectors, timing and handshaking meet. Often the procedures, codes, and protocols that enable the two devices to interact are included or caRR2000out by the interface. An example is an RS-232-C port. Some of its 25 pins are used to send different information and make sure devices can talk to each other. The pins caRR2000fferent messages, such as "Requested To Send", "Acknowledgment" and "Data Set Ready".
Layer - In the OSI model, it refers to a collection of network processing functions that together compose one layer of a hierarchy of computing functions. Each layer performs a number of functions, essential for successful data communication.
Local Area Network (LAN) - A data communications spanning a limited geographical area, a few miles at most. It provides communications between computers and peripherals, and some switching to direct messages.
Network Topology - The geography of a network, the layout, whether it is mesh, star, bus or ring.
Nodes - Points in a network where service is provided, service is used, or communication channels are interconnected. The term node is sometimes used interchangeably with workstation or end- station.
OSI - Abbreviation for Open System Interconnection, a logical structure for network operations standardized within the ISO.
OSI Model - The International Standards Organization (ISO) has established the Open System Interconnection (OSI) Model. The idea of OSI is to provide a network design framework to allow equipment from different vendors to communicate.
Packet (Frame) - A group of bits, including address, data and control elements, that are switched and transmitted together. Think of packet as one sentence or one group of numbers being sent at a time. The terms frame and packet are often used interchangeably.
Port - A place where data can enter or leave the network or computer. Examples are the serial or parallel "ports" on the back of most PCs.
Protocol - A set rules for communicating between computers. These govern format, timing, sequencing, and error control. Think of protocol as the rules for communicating. Without these rules, the computer won't make sense of the stream of incoming bits. There can be sets of protocols in some networks, with each protocol handling rules for a subset of the entire task of communication. This set of protocols is often referred to as a suite of protocols or protocol suite. Protocol stack is another term used to describe a set of protocols.
Remote Station - Any piece of equipment attached to a LAN through a bridge. Technically, that includes all devices. It also refers to a workstation at a distant location, linked to the main LAN by a remote bridge over a wide area network.
Routing - The process of choosing the best path through the extended LAN. Routing lets PCs which are not directly connected to communicate by passing messages through bridges or routes. Routing is a difficult science in data networks because there are so many factors to take care of, especially when moving through networks of networks.
Topology - Description of the physical connection of a network, or the description of the possible logical connections between nodes, indicating which pairs of nodes are able to communicate. Examples are bus, ring, star and tree.
Wide Area Network - A data communication network designed to serve an area of hundreds or thousands of miles. Public and private packet switching networks and the nation-wide telephone network are good examples of wide area networks.
Prepared by SiGraf
