TCP/IP SUPPLEMENT SCALE NETWORKING

Transcription

1 TCP/IP SUPPLEMENT SCALE NETWORKING 701 S. RIDGE AVENUE TROY, OHIO FORM (5-98)

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3 Table of Contents Understanding TCP/IP Communications Protocol...3 Understanding the IP Address... 3 Setting Up Scale IP Addressing...4 Entering IP Address Information for Server and Client Scales...4 Setting Up Client Scale s Department IP Address on the Server Scale...5 Setting Up ScaleMaster Located on a Different Network...7 Backing Up Scales to Retain TCP/IP Information...7 Sample Ethernet Wiring Illustration...8 Multi Scales Connected in Stand Alone Department (Configured with IntraNet single point configuration)...9 Multi Scales Connected to a Hub with ScaleMaster...10 Multi Scales Connected to a Hub with ScaleMaster (Departments Configured with IntraNet Single Point Configuration) Scale IP Address Assignment Form Testing Scales TCP/IP Connection Troubleshooting IP Addressing...16 Appendix Glossary Hobart Corporation, 1998

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5 Understanding TCP/IP Communication Protocol Transmission Communications Protocol/Internet Protocol (TCP/IP) is a communication protocol which maybe used to make your scale system communicate faster and more reliably. It serves as a traffic manager for sending and receiving packets of information between scales and devices. Scales can be automatically updated with information which is sent directly from a server scale or ScaleMaster. Understanding the IP Address The IP Address is a naming convention used to identify a scale or device located on a network. Each IP Address must be unique to each scale (other scales or devices on a network cannot have the same IP Address). Note If the scale is on an existing network, contact the Network Administrator for the correct IP Address information. Base_Number. Store_Number. Department_Number. Scale_Number IP Address The following shows the components of an IP addressing scheme for scales connected to a Hobart only network. IP Address Range Base_Number (1-255) Store_Number (1-255) Department_Number (1-255) Server Scale_Number (1-255) Intranet Client Scale_Number (2-99) Description This is a number between 0 and 255. This is a number assigned by the customer that represents each store in a chain. This number identifies a department in a store. This represents the scale ID number. This represents the client scale ID number. 1

6 Setting Up Scale IP Addresses Entering IP Address Information for Server and Client Scales QUICK STEPS From the Supervisor Menu: 1. PRESS [F5] 2. PRESS [F6] 3. PRESS [F2] 4. PRESS [F2] 5. TYPE the IP Address 6. PRESS [ESC] 7. PRESS [ESC] 8. Reset the scale The following steps explain how to access and set up the IP Addresses for scales. To set up Server and Client Scale IP Addresses: 1. From the Supervisor Menu, PRESS [F5] to select Scale Setup Menu. 2. PRESS [F6] to select Communications Menu. 3. PRESS [F2] to select TCP/IP Network. 4. From the TCP/IP Network Screen, PRESS [F2] until IntraNet or ScaleMaster is the selected network type. Note There are several options available (None, MiniNetII, ScaleMaster, and IntraNet). Each time [F2] is pressed it cycles through these options. Select either ScaleMaster or IntraNet based on configuration needs. 2

7 5. TYPE the appropriate IP Address information for each scale. (Refer to the Scale IP Address Table.) Note If setting up server scales, continue to Setting Up Client Scales Department IP Address on the Server Scale. 6. After entering the client scales IP Address, PRESS [ESC] to return to the TCP/IP Network Screen. 7. PRESS [ESC] until the Start a Run Screen displays. 8. PRESS the RESET button (located on the left side of the scale) for 3 seconds and release. This will reset the scale with the updated communication settings. The scale will automatically power back on. Setting up the Client Scale s Department IP Address on the Server Scale (IntraNet Configuration) Server Scale setup only The Department IP Address List Menu is where you set up and identify the servers client scales. The list is used by the server to identify the client scale s in a department. The following steps explain how to access and set up the department IP Addresses on Server Scales. 1. From the TCP/IP Network Screen, PRESS [F8] to select Department IP Address List. 3

8 QUICK STEPS From the Supervisor Menu: 1. PRESS [F8 2. PRESS [F3] 3. TYPE the IP Address 4. PRESS [ESC] 5. PRESS [ESC] 6. Reset the scale 2. PRESS [F3] to select New IP Address. A line number displays with space to enter the client scale IP Address. 3. TYPE the IP Address for the client scales on the line which displays. Up to 29 scales can be added to a department. Note The Department IP Address List identifies the server s client scales by department. Additional departments require a separate server setup for each department. 4. Once all client scale s IP Addresses are entered, PRESS [ESC] to return to the TCP/IP Network Screen. 5. PRESS [ESC] until the Start a Run Screen displays. 6. PRESS the RESET button (located on the left side of the scale) for 3 seconds and release. This resets the scale with the updated communication settings. The scale will automatically power back on. 4

9 Setting up ScaleMaster Located on a Different Network If your scales are not physically located on the same network as the PC which is running ScaleMaster, you must set up the Gateway IP Addresses for that network. Note Contact your Network Administrator for specific Gateway details for Network IP Routing. 1. From the TCP/IP Network Screen, PRESS [F7] to select Network IP Routing Table Screen. 2. Enter the Gateway IP Address and the Network IP Address as specified by the Network administrator. Gateway IP Address XXX. XXX. XXX. XXX Network IP Address XXX. XXX. XXX. XXX Backing Up Scales to Retain TCP/IP Information After setting up the TCP/IP scale information, it is recommended to back up the scale system settings. Refer to your scale manual for detailed procedures. Note (Caution) Loading an older database into the scale, with configuration turned "on" (type of data transfer), may wipe out the new IP Address information. This may result in loading incorrect IP Address information into the scale. 5

10 Sample Ethernet Wiring Illustration Use the following suggested IP Addresses for one of the types listed below: Multi Scales connected in Stand Alone Department (configured with IntraNet single point configuration). Multi Scales connected to a Hub with ScaleMaster Multi Scales connected to a Hub with ScaleMaster (Departments configured with IntraNet single point configuration) Look At This The IP addresses illustrated may vary for your network. 6

11 Multi Scales Connected in Stand Alone Department (configured with IntraNet single point configuration) Server Scale The following configuration shows 2 stand alone scales connected to a hub using the Intranet option. From the TCP/IP Network Screen, ENTER the following: TCP/IP Network Scale Menu Type: Intranet (same for client) Scale IP Address Server IP Address Subnet Mask (same for client) (same for client) Well known port number 6000 (same for client) Server Scale From the Department IP Address List Screen, set up the Client Scale s Department IP Address on the server. A maximum of 29 scales for a single department can be added to a Server. Department IP Address List 1) (Client scale 002 IP Address) Client Scale 002 Setup From the TCP/IP Network Screen, ENTER the Client Scale s IP Address. All other fields must be the same as the Server information. Scale IP Address Note The Department IP Address settings, on Client Scales, always remain blank. After entering all IP Address information, PRESS the RESET button (located on the left side of the scale) for 3 seconds and release. This resets the scale with the updated communication settings and enables the changes to take affect. The scale will automatically power back on. 7

12 Multi Scales Connected to a Hub with ScaleMaster The following illustrates scales connected to the network via a Hub with ScaleMaster configuration. Note If your scales are not physically located on the same network as the PC which is running ScaleMaster, you must set up the Gateway IP Addresses for that network. Contact your Network Administrator for specific Gateway details for Network IP Routing. From the TCP/IP Network Screen, ENTER the following: Each scale must us a unique IP address. TCP/IP Network Scale Menu Type: ScaleMaster Scale IP Address Server IP Address Subnet Mask Well known port number 6000 Note The Department IP Address settings, on Client Scales, always remain blank. After entering all IP Address information, PRESS the RESET button (located on the left side of the scale) for 3 seconds and release. This resets the scale with the updated communication settings and enables the changes to take affect. The scale will automatically power back on. 8

13 Multi Scales connected to a The following illustrates scales connected to the network via Hub with ScaleMaster a hub and configured for IntraNet. (Departments configured with IntraNet single point configuration) From the TCP/IP Network Screen, ENTER the following: Server Scale TCP/IP Network Scale Menu Type: Intranet (same for client) Scale IP Address Server IP Address Subnet Mask (same for client) (same for client) Well known port number 6000 (same for client) Server Scale From the Department IP Address List Screen, set up the Client scales Department IP Address information on the server. A maximum of 29 Department Scales can be added to a Server. Department IP Address List 1) (Client Scale 002) 2) (Client Scale 003) -Through - 29) (Client Scale 029) 9

14 Client Scales 002 thru 029 From the TCP/IP Network Screen, Enter each Scales IP Address. All other fields must be the same as the Server information. Scale IP Address (Client Scale 002) (Client Scale 003) -Through (Client Scale 029) Note The Department IP Address settings, on Client Scales, always remain blank. After entering all IP Address information, PRESS the RESET button (located on the left side of the scale) for 3 seconds and release. This resets the scale with the updated communication settings and enables the changes to take affect. The scale will automatically power back on. 10

15 Scale IP Address Assignment Form Scale Network Addressing Example Base_Number Store_Number Dept._Number Scale_Number I. Server Scale IP Address: Server scale located in the Department A) Bakery: XXX.XXX B) Cheese: XXX.XXX C) Deli: XXX.XXX D) Meat: XXX.XXX E) Service Meat: XXX.XXX F) Sea Food: XXX.XXX G) Produce: XXX.XXX H) Specialty: XXX.XXX ScaleMaster : XXX.XXX.XXX.XXX (refer to your ScaleMaster documentation) II. Scale Subnet Mask (same for all scales): Scale Subnet Mask: III.Well Known Port Number (same for all scales): Well known port number: 6000 IV. Client Scale IP Addresses: (Intranet Configuration) Note: Each Department will require a separate Server with the Department Client Scale IP information added. A) Bakery: XXX.XXX Client Scales XXX.XXX B) Cheese: XXX.XXX Client Scales XXX.XXX C) Deli: XXX.XXX Client Scales XXX.XXX D) Meat: XXX.XXX Client Scales XXX.XXX E) Service Meat: XXX.XXX Client Scales XXX.XXX F) Sea Food: XXX.XXX Client Scales XXX.XXX G) Produce: XXX.XXX Client Scales XXX.XXX H) Specialty: XXX.XXX Client Scales XXX.XXX Server Scale:... (A maximum of 29 Client Scales can be added to a Department) 1) Scale:... 2) Scale:... 3) Scale:... 4) Scale:... 5) Scale:... 6) Scale:... 7) Scale:... 8) Scale:... 9) Scale:... 10) Scale:... 11) Scale:... 12) Scale:... 13) Scale:... 14) Scale:... 15) Scale:... 16) Scale:... 17) Scale:... 18) Scale:... 19) Scale:... 20) Scale:... 21) Scale:... 22) Scale:... 23) Scale:... 24) Scale:... 25) Scale:... 26) Scale:... 27) Scale:... 28) Scale:... 29) Scale:... ScaleMaster :... 11

16 Testing the Scales TCP/IP Connection The following steps will confirm that the scales are connected and communicating with each other over the network. 1. Check the Ethernet Diagnostic L.E.D.s to see if they are functioning correctly. This L.E.D. Does This Ethernet Diagnostic L.E.D.s LNK (Link) Indicates a link has been established with the Ethernet network. This will be on when the scale is connected to an Ethernet network. POL (Polarity) COL (Collision) RCV (Receive) XMT (Transmit) Verifies the polarity of the receive pair from the network. This should be off if the network wiring polarity is correct. (Note: Even if the light is on, the scale may still communicate and respond to a ping test.) Indicates a collision condition on the Ethernet network. This condition is caused by 2 devices trying to communicate at the same time. This should be off most of the time. (Note: This light may occasionally blink if connected to an active Network.) Indicates network activity. Any network activity should cause it to flash. Intense network activity may cause it to appear to remain on. Indicates that the scale is communicating to the Ethernet network. During communication this will flash or may appear to remain on. 12

17 2. Update a product on the Server Scale (updates are automatic with the Intranet network selection). 3. Check the Server Scale for the Transmission Occured message. 4. Verify that the product update is reflected on the Client Scales associated with the Server. Note If an error occurred and the Ethernet Diagnostic L.E.D. are functioning correctly, check the error log, refer to Troubleshooting IP Addresses or reset each scale by pressing and releasing the Reset button then repeat steps 2 through 4. 13

18 Troubleshooting IP Addresses The following section contains information to help you troubleshoot problems within your configuration. The references give you items to troubleshoot, tools to use while troubleshooting and messages to look for when you are troubleshooting. Error Message Possible Cause Suggested Action TCP/IP: Connect error, check IP Address configuration. TCP/IP: Could not talk to scale. Check with Network Administrator. TCP/IP: Could not disconnect. System time-out occurred. TCP/IP device not installed (PathWay Runtime stack). TCP/IP socket table full, no sockets available (no buffer space). TCP/IP socket is already connected. TCP/IP could not establish socket, check IP and network. TCP/IP connection refused, check cables/ports/ IP Address. Invalid IP Address configured for the scale. Something terminated the connection between the scale and ScaleMaster. After a successful connection, the disconnect from the scale failed. Invalid components installed. TCP/IP stack out of resource. ScaleMaster is trying to connect to a scale that is already connected. Invalid IP Address configured or the PC is not connected to the ethernet network. The scale has exhausted all of its sockets. Compare the IP Address in the scale to the IP Address, which you configured in ScaleMaster. These addresses should match. Check with your Network Administrator. Check with your Network Administrator. This is a networkrelated problem. Check PathWay Runtime installation against Hobart recommended installation. (This is a ScaleMaster component. Contact your Network Administrator for details.) Increase packet buffer sizes in PathWay Runtime installation. This can be done through the Advanced Configuration Setup available in PathWay Runtime. (This is a ScaleMaster component. Contact your Network Administrator for details.) Wait 30 seconds for the scale to time out and retry the operation. Verify the IP Address in the scale against the IP Address, which you configured in ScaleMaster. The numbers should match. --OR-- Check your network connection. --OR-- Verify that Well Know Port setting in the uiconf.txt file matches the scale (ScaleMaster uses 6000). Give the scale 1-minute to regain its resources. 14

19 Error Message Possible Cause Suggested Action TCP/IP: The scale aborted the communications task. The scale is out of memory. Ethernet Card The scale encountered a critical error during communication and aborted the task. The scale does not have enough memory available to process any new data. View the Activities that were Attempted Screen concerning the communication error. (This is a ScaleMaster component. Contact your Network Administrator for details.) Free memory available in the scale (i.e., delete totals, add memory, delete unused PLUs, etc.). Symptom Possible Cause Suggested Action Link light on ethernet card not on. (If the card is equipped with lights.) You receive system error messages during boot. The system cannot communicate. Hub to Scale A cable is disconnected and/or damaged. There are configuration problems. The connections to both the BNC and RJ- 45 connectors. Verify cable connections and integrity. The link light only functions for the RJ-45 connector. If the card has a BNC connector and the connector is in use, the link light may not light. Verify the correct drivers are being used. Consult the ethernet cards documentation and perform the card diagnostics provided by the manufacturer. Some manufacturers of ethernet adapters provide connector for both BNC and RJ-45 connections. If the card has both connectors in use, generally the RJ-45 connection takes precedence. Consult the manufacturers documentation for specific information. Symptom Possible Cause Suggested Action Both the scale and hub link lights are off or flashing. Both the scale and hub link lights are off or flashing. A cable is disconnected and/or damaged. It is the incorrect cable and/or an incorrectly wired cable. No power to hub and/or scale. The hub switch setting is incorrect. Verify cable connections and cable integrity. Verify the correct cable is being used for the port in use at the hub (Straight Through or Crossover, depending on configuration). Verify the plug wiring at both ends. Verify that the hub and/or scale is connected to the appropriate power source. Verify that the hub crossover switch is set correctly. (Not all hubs have switches.) 15

20 Hub to Scale (continued) Symptom Possible Cause Suggested Action The scale link light is off. Hub link light is off or flashing. Hub link light is off or flashing. (continued) A cable is disconnected and/or damaged. It is the incorrect cable. The RJ-45 plug pins 3 & 6 are wired incorrectly. Verify cable connections and cable integrity. Verify that a crossover cable is used if connecting to two ports marked with a "X" (internal crossover). Verify that a straight through cable is used if connecting to a port on one hub marked with an "X" (internal crossover). Verify the wiring at both ends. No power to scale. Verify that scale is connected to the appropriate power source. Defective port on hub. The scale board is defective. A cable is disconnected and/or damaged. There is no power to the hub. It is the incorrect cable. The RJ-45 plug pins 1 & 2 are wired incorrectly. The hub switch setting. A defective port on the hub and/or a defective hub. The scale board is defective. Connect scale to a different port and recheck link light. Replace board. Prior to replacing the board, connect the scale in place of a scale that is working and recheck link light. Verify cable connections and cable integrity. Verify that the hub is connected to the appropriate power source. Verify that a crossover cable is used if connecting to two ports marked with an "X" (internal crossover). Verify that a straight through cable is used if connecting to a port on one hub marked with an "X" (internal crossover). Verify the wiring at both ends. Verify that the hub crossover switch is set correctly. (Not all hubs have switches.) Refer to Understanding ScaleMaster Ethernet Networks. Connect scale to a different port and recheck link light. Replace board. Prior to replacing the board, connect the scale in place of a working scale and recheck link light. 16

21 Hub to Hub Symptom Possible Cause Suggested Action The link lights on both hubs are off or flashing. The polarity light (POL) on scale is on. The collision light (COL) on the scale is on. The partition light on the scale is on. All TCP/IP scales are offline. It is an incorrect cable. There is no power to hub(s). The polarity is incorrect. Multiple devices are trying to communicate at the same time. There are wiring/device problem(s). There are computer problem(s). Verify that a crossover cable is used if connecting to two ports marked with an "X" (internal crossover). Verify that a straight through cable is used if connecting to a port on one hub marked with an "X" (internal crossover). Verify that the hub(s) are connected to the appropriate power source. Verify cable wiring. The Polarity light indicates that the polarity is reversed in a RJ-45 plug between pins 3 & 6 in the cable from the scale to the hub. Contact the system administrator. Remove power from the hub. Wait 30 seconds and reconnect. If the partition light comes back on, troubleshoot the wiring attached to the indicated hub port. Look for bad wiring, EMF sources close to the wiring, and/or a device problem. Verify that all drivers are loading while the computer is booting and that no error messages are displayed. Attempt to ping the computer using an IP of If the ping test fails, troubleshoot the ethernet adapter board and/or the drivers. Attempt to ping the computer where ScaleMaster is installed from any other computer on the network. Initiate a ping test to any valid address. While the ping test is in progress, observe the activity light on the ethernet adapter board, (it should be flashing). Also observe the RCV L.E.D.s on the scales. The L.E.D.s should be flashing. If the L.E.D. flashes on the ethernet adapter, but not on the scales, troubleshoot the configuration and/or network wiring. If the L.E.D. on the ethernet adapter does not flash, troubleshoot the computer/adapter installation. 17

22 Hub to Hub (continued) Symptom Possible Cause Suggested Action All TCP/IP scales are offline. (continued) Some scales are on-line and one or more scales are off line. There are configuration problem(s). There are wiring problem(s). The scale configuration is incorrect. There are wiring problem(s). There are hub problem(s). Verify that the Well-Known Port setting in Uiconf.txt matches the Well-Known Port setting in the scales (ScaleMaster uses 6000). Verify that the scale IP Addresses match the IP Addresses configured in ScaleMaster. Verify that the IP configured in PathWay Runtime is correct and that the correct subnet mask was specified. Verify that all cables are connected. Verify that all link lights are on at the hubs and at the scales. Disconnect all scales from the network and attempt to communicate with each scale after reconnecting. Verify that the scale network has not been partitioned by the ethernet hub. Verify the scale network configuration. Verify that each scale has a unique IP Address. Verify the status of the scales ethernet L.E.D.s for link, polarity, and collision. Verify the scale has the correct Well-Known Port (ScaleMaster uses 6000). Verify that all cables are connected on the affected segments. Verify that all link lights are on at the hubs and at the scales. Verify that the scale network has not been partitioned by the ethernet hub. If all the scales that are off-line are connected to one hub, troubleshoot the hub. 18

23 Appendix Understanding Ethernet Networks To effectively set up Scales with TCP/IP, you should have a basic understanding of ethernet networking. A Network Consultant or Network Administrator should be contacted prior to implementing an Ethernet LAN system. Hubs Hubs for 10BaseT are available with different numbers and types of ports. The IEEE standard recommends that the signal crossover function for 10BaseT connection is done inside the hub port. This standard also notes that all ports featuring an internal crossover be designated with an "X". Some hubs provide a port where the crossover function is controlled by a switch. This port is generally used for cascading hubs using straight through cables. Hubs where all ports feature an internal crossover generally require a crossover cable to cascade the hubs. stackable hubs, which provide a special connection for stacking 2 or more hubs, are also available. Stacked hubs count as one hub when calculating the number of hubs and segments between two stations. Note 10BaseT hubs are also available with connections for attaching to a 10Base2 (coax cable) network. Wiring An Ethernet network may consist of several different cable types. ScaleMaster may be used successfully with any type of Ethernet network if provisions are made to provide a 10BaseT connection for each scale. Refer to your ScaleMaster TCP/IP supplement for more information (F-33863). Wiring Specifications 10BaseT (or UTP-Unshielded Twisted Pair) length segments have a maximum of 328Ì (100m). This is the maximum amount allowed between hubs or remote devices (i.e. scales or computers). The network is also restricted to a maximum of 4 hubs between any two devices. 19

24 Wiring Categories Hobart Ethernet scales supporting TCP/IP require a network connection using 10BaseT wiring. Hobart recommends that all wiring conform to Category 3 or 5 standards, published by EIA. Note Category 3 wiring may be used but is not recommended. Look At This All wiring and cabling must be installed to meet National and Local Electrical Codes. All Ethernet wiring must conform to IEEE specifications. All cabling should be installed to meet the cabling pathway requirements of EIA/TIA Standard 569, table Crossover Function Two Ethernet 10BaseT devices can only communicate if the transmitter on one device is connected to the receiver on the other device. When connecting two identical 10BaseT ports (ports that either both support the crossover function or both do not support the crossover function), the crossover function must be implemented in the wiring. Patch Cord Wiring A patch cord is the connecting cable between two pieces of hardware on an ethernet network. The recommended standard for wiring patch cords is the EIA/TIA 568B standard, using RJ-45 8 conductor connectors. The patch cords used may be wired to any standard as long as all cords are wired using the same standard. The EIA/TIA 568B standard is recommended for conformity with industry standards. 20

25 Straight Thru Patch Cord A straight thru patch cord has both ends wired the same and is generally used to connect computers to the hub and to connect devices to hubs. Depending on the hub a straight thru patch cord or crossover patch cord may be required to cascade hubs. Refer to the documentation provided by the manufacturer of you hub. 10 Base - T Straight Thru Patch Cord Pin Color Signal 1 White/orange TX data + 2 Orange/white TX data - 3 White/green RX data + 4 Blue -- 5 White/blue -- 6 Green/white RX data - 7 White/brown -- 8 Brown -- 21

26 Crossover Patch Cord A crossover patch cord is generally used to cascade hubs. A crossover patch cord has one end wired as a straight thru connection and the other end wired as a crossover connection. Depending on the hub, a straight thru patch cord, or a crossover patch cord may be required to cascade hubs. Refer to the documentation provided by the manufacturer of your hub. 10 Base - T Crossover Patch Cord Pin Color Signal 1 White/green RX data + 2 Green/white RX data - 3 White/orange TX data + 4 Blue -- 5 White/blue -- 6 Orange/white TX data - 7 White/brown -- 8 Brown -- 22

27 Wiring Identification As part of the Hobart recommended cable identification scheme, all ethernet hubs should be marked with a unique hub number. All ethernet patch cords should be marked at both ends with the originating hub and port number and the destination hub and port number. Refer to the following example. 23

28 Glossary Abstract Notation Syntax One (ASN.1) Address Address Mask Address Resolution API Application Layer Backbone Baseband BER Bit rate Bridge Broadband Broadcast A language used in OSI and TCP/IP networks to define data types for use in network management. An identifiable location. A location within memory. A location of a node within a network. A way of identifying a network, sub network, or node. A way of omitting certain parts of an IP Address in order to reach the target destination without broadcasting an address to unnecessary LAN segments or sub networks. It is also referred to as a subnet mask. The address mask uses the 32-bit IP Addressing scheme. A variation of is used. The mapping of an IP Address to a hardware address. In the TCP/IP suite of protocols, Address Resolution Protocol (ARP) performs this function. Application Program Interface. Defined routines that are callable services by a program. The topmost layer in the OSI reference model that aids in the identification of communicating partners. Used to refer to a set of nodes and links connected together compromising a network. It is also used to refer to the physical media that connects components to a network. A type of channel where data transmission is carried across only one communication channel. Baseband supports one signal transmission at a time. Ethernet is an example of baseband technology. Bit Error Rate The rate, usually expressed in seconds, that bits are transmitted. A network device capable of connecting networks using similar protocols. A range of frequencies divided into narrow bands, each of which can be used for different transmission purposes. Also known as wideband. Simultaneous transmission of the same data to all nodes connected to a network. 24

29 Carrier Sense Carrier Sense Multiple Access with Collision Detection (CSMA/CD) Client Client/Server Architecture Client/Server Collision Collision Detection Crosstalk Daemon Datagram Data Link Data Link Protocol Destination Address Distributed Processing Domain Name System Dotted Decimal Notation A signal generated at the physical network layer to inform the data link layer that one or more nodes are transmitting on the underlying medium. This is the media access control protocol. Nodes using this protocol listen to the medium to which they are attached. As long as there is no signal on the medium being monitored, a node listening can send data across the medium. A program that can be invoked by a user; a user being a human or a program. A general phrase used to refer to a distributed application environment where a program exists that can initiate a session and a program exists to answer the requests of a client. Terms used to refer to a peer to peer method of operation of applications within hosts. An event that occurs when two or more nodes broadcast on the same network medium at the same time. The ability of a device to detect if a collision has occurred. Signals that interfere with another signal being transmitted. A common UNIX program that operates unattended, performing standard services. This type of program can be triggered by time intervals for execution. A basic unit of data that traverses a TCP/IP internet. The part of a node that is controlled by a data link protocol. It is the logical connection between two nodes. A prescribed way of handling the establishment, maintenance, and termination of a logical link between two nodes. In an Ethernet network, this refers to the target node address. I/O processing, control functions, and actual processing is dispersed among two or more nodes. A service used with TCP/IP to replace the previous method of keeping track with host names, aliases, and internet addresses. The domain name service is a distributed database used to convert node names to internet addresses. A representation of addressing typically used in expressing internet protocol addresses. For example, is an internet address identifying a network and host. 25

30 Double Byte Character Set Encapsulation Ethernet Ethernet Address Frame Frame Check Sequence (FCS) Frame Relay File Transfer Protocol (FTP) Gateway Hardware Address Internet Control Message Protocol (ICMP) Interface A character set where alphanumeric characters are represented by two bytes. Examples of languages where this is used include: Japanese, Chinese, and Korean. A technique used by layered network protocols where, as data travels down the network layers, headers and trailers are added to represent that layer. For example, when data is passed from an application above the TCP layer, TCP adds a header and a trailer encapsulating the data; likewise, this datagram is passed to the IP layer where IP wraps an IP header and trailer around the TCP portion, and so on for each layer. When this arrives at the target host, the reverse occurs, as the data travels up the layers, respective headers and trailers are removed. A data link level protocol. It comprises layers one and two when compared to the OSI reference model. Ethernet is a broadcast technology and can be implemented with different media types, such as thick or thin coaxial cable or twisted pair cable. Ethernet uses CSMA/CD mechanism to access the medium. A 48 bit address, commonly referred to as a hard address. This address identifies an Ethernet network interface card (NIC), thus identifying a host hardware address. Refers to the data and all headers and trailers. A mathematical function used with bits in a frame. The FCS is appended to the frame and used by the receiving end to recalculate the value to determine if an error has occurred. A switching mechanism for routing frames as quickly as possible. A TCP/IP based application used for transferring files from one system to another. Part of FTP provides password protection. A networking device that translates all protocols of one type network into all protocols of another type network. (i.e. Ethernet to Token Ring). A low-level address associated with each node on the network. This address is generally the address related to the interface card in the node. This may also be referred to as the Ethernet Address. A protocol that works in conjunction with the Internet Protocol (IP) that handles error messages. A shared point between two entities, either software or hardware. 26

31 Internet Address Internet Protocol (IP) IP Datagram ISO ISO Reference Model Jitter Local Area Network (LAN) Learning Bridge Leased Line Link Logical Link Control Media Access Control (MAC) Maximum Transmission Unit (MTU) Medium Access Unit (MAU) Management Information Base (MIB) Name Resolution Network Administrator A 32-bit address used to identify hosts and networks. The part of the TCP/IP protocol that handles routing of data. The basic unit of information passed through a TCP/IP network. This datagram contains source and destination addresses. International Standards Organization The networking model created by ISO defining seven layers of a network, isolating functions within each layer. It is used as a baseline for comparison with other network types. A situation that can occur with a 10BaseT network where signals are out of phase with each other. A collection of computer related equipment connected in such a way that communication can occur between all nodes connected to the medium. Serves as a bridge but has the capability to learn what nodes are connected and route data accordingly. A dedicated communication line between two points. Used to refer to a connection between two end points. The upper part of the data link sublayer protocol responsible for governing the exchange of data between two endpoints. The lower half of the data link sublayer. It is responsible for framing data and controlling the physical link between two stations. The largest datagram that can transverse a given network such as Ethernet or Token Ring. A device for central connection of nodes operating in a network. A database containing configuration and statistical information about nodes on a network. The process of mapping aliases to an address. The domain name system provides a mechanism to perform this function. The person designated to maintain the network. This person should have working knowledge of network wiring, requirements, etc. See System Administrator. 27

32 Network Basic Input Output Operating System (NETBIOS) Network Network Address Network File System (NFS) Network Interface Card (NIC) Node Open Systems Interconnection (OSI) Packet Pathname Packet InterNet Groper (PING) Point to Point Protocol (PPP) Port Protocol Protocol Conversion Repeater Routing Routing Table RS-232-C An IBM and compatible network programming interface. A collection of computers and related devices connected so that communication can occur. In TCP/IP networks, this refers to the IP Address of a node. Sun MicroSystems protocols that permit clients to mount remote directories onto their own local file system, thus appearing to be local. A generic reference to a networking interface card. Refers to different types of networking devices. A set of ISO standards relating to data communications. In TCP/IP networks, this refers to the data passing between the internet layer and the data link layer. A packet includes the IP header, TCP header, and data. The complete string of information that must be entered into a system in order to access or identify a file. A program used with TCP/IP networks. The PING program provides a way of testing access to a destination by sending an ICMP echo request, then waiting for a response from the target host. A protocol that has the ability to provide host to network and router to router connections over synchronous and asynchronous lines. In TCP/IP, a number used to identify applications. In general, a port is referred to as an entry or exit point. Ports are associated with TCP or UDP transport protocols. A set of rules governing the method of operation. Changing one type of protocol to another type of protocol. A network device that repeats signals so the length of a network can be extended. The process of determining which path is to be used for data transmission. A list of valid paths through which data can be transmitted. A physical layer specification for connecting devices. 28

33 Segment A protocol data unit that consists of TCP header information and optional data. Parts of a network; typically Ethernet LANs are divided into parts, generally referred to as segments. Server Simple Mail Transfer Protocol (SMTP) Serial Line Internet Protocol (SLIP) Socket Socket Address Subnet Subnet Address Subnet Mask System Administrator Telnet TCP TCP/IP 10Base2 An application that answers requests from clients. In TCP/IP, an application including a client and a server providing services for all hosts with TCP/IP software installed and enabled. A protocol used to utilize Internet protocol over serial lines, such as a switched telephone line. In TCP/IP, a socket is an addressable point that consists of the IP Address and the TCP or UDP port number. It provides access to TCP/IP protocols. The complete designation of a TCP/IP node. It consists of a 32-bit IP Address and a 16 bit port number. The part of a TCP/IP network identified by a portion of the internet address. The part of the IP Address that identifies the subnetwork. A way of isolating broadcasts to the desired network(s). The person responsible for maintaining the ScaleMaster system. See Network Administrator. A TCP/IP application using TCP as a transport mechanism. It consists of a client and a server. All TCP/IP protocol suites have this application because it is part of the definition of TCP/IP. Transmission Control Protocol. A transport layer protocol that is part of the TCP/IP protocol suite. TCP provides a reliable stream mechanism performing re-transmission when a positive acknowledgment is not returned to the source from the destination node. Transmission Control Protocol / Internet Protocol. TCP/IP is an upper layer networking protocol. It is client/server based at the application layer. A reference to the cabling used in an Ethernet network. It literally means 10Megabits per second, using baseband signaling, with a continuous cable segment length of 100 meters and a maximum of 2 segments. 29

34 10Base5 10BaseT Throughput Token Ring Topology Traffic Transceiver User Data Protocol (UDP) Virtual Well Known Port Wide Area Network (WAN) A reference to the cabling used in an Ethernet network. It literally means 10Megabits per second, using baseband signaling, with 5 continuous segments, not exceeding 100 meters per segment. A reference to the cabling used in an Ethernet network. Meaning 10Megabits per second, using baseband signaling, and twisted pair cabling. The amount of data that can be successfully moved across a medium or processed within a certain time period. A lower layer networking protocol using a token passing method controlling data traffic. It is connection oriented at a data link level. The configuration of network devices. Examples include: BUS, Star, Ring, Dual Ring, etc. A generic term used to describe the amount of data on a network backbone at a given period in time. A network device required in baseband networks. It takes a digital signal and puts it on the analog baseband medium. Transceivers are devices that also sense collisions. A transport layer protocol in the TCP/IP protocol suite. Unlike TCP it does not provide re-transmission. Appearing to exist, but in reality the appearance is achieved by functions or processes. In TCP/IP, an address for an expressed purpose generally agreed upon by TCP/IP users. A network spanning large geographic distances. 30

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36 FORM (5-98)