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Multitech MTPSR1-120 User Manual

Dual ethernet proxyserver
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Dual Ethernet ProxyServer
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  • Page 1 Dual Ethernet ProxyServer Model MTPSR1-120 User Guide...
  • Page 2 Furthermore, Multi-Tech Systems, Inc. reserves the right to revise this publication and to make changes from time to time in the content hereof without obligation of Multi-Tech Systems, Inc. to notify any person or organization of such revisions or changes.

  • Page 3: Table Of Contents

    Changing PPP/SLIP Parameters ... 35 Changing WAN Port Parameters ... 35 Enabling the DHCP Server ... 37 Adding Proxy Applications ... 38 Adding Virtual Servers ... 40 Managing Various Applications ... 43 Running Statistics ... 44 User - Filter Management ... 45 User Management ...
  • Page 4 Chapter 5 - Client Setup Introduction ... 50 Before you Begin ... 50 Configuring in Windows 98/95 ... 51 Installing TCP/IP (Win98/95) ... 58 Configuring in Windows NT ... 59 Installing TCP/IP (WinNT) ... 65 Chapter 6 - Remote Configuration Introduction ...

  • Page 5: Chapter 1 - Introduction And Description

    Chapter 1 - Introduction and Description...

  • Page 6: Introduction

    Firewall User Guide Introduction Welcome to Multi-Tech's new Dual Ethernet ProxyServer, model MTPSR1-120, (hereafter, Firewall) a high speed Internet access device that provides firewall protection to your corporate (secured) LAN and allows Internet access to the Internet Services Network (public LAN) that resides outside the firewall.
  • Page 7 Chapter 8 provides instructions on getting service for your Firewall at the factory, a statement of the limited warranty, information about our Internet presence, and space for recording information about your Firewall prior to calling Multi-Tech’s Technical Support. Appendixes Appendix A...

  • Page 8: Front Panel Description

    Carrier Detect indicator lights when a carrier signal is detected on the WAN link. V.35 indicator lights when internal shunt is set for V.35 operation. Fail Error indicator lights when the Firewall is booting or downloading setup. Power Power indicator lights when power is applied to the Firewall. Figure 1-2. Front Panel MTPSR1-120...

  • Page 9: Back Panel Description

    The Power connector is used to connect the external power supply to the Firewall. The Power connector is a 6-pin circular DIN connector. A separate power cord is connected between the power supply and a live AC grounded outlet. MTPSR1-120 Chapter 1 - Introduction and Description ETHERNET...

  • Page 10: Typical Applications

    Internet Services Provider (ISP) to dynamically provide the registered Internet IP addresses at each login. (If a static IP addressing scheme is provided by the ISP, then the assigned static IP address is used instead.) MTPSR1-120 Firewall IP Address 192.168.0.101 Mask 255.255.255.0...

  • Page 11: Configuration 2 - Existing Dual-Lan With Router

    Firewall. The Internet Services Network, or public LAN, is connected to the ETHERNET 2 jack. Access to the Internet is provided by the existing router connected to the Internet Services Network. MTPSR1-120 Chapter 1 - Introduction and Description MTPSR1-120 Firewall IP Address 192.168.0.101 Internet LAN Mask 255.255.255.0 IP Address 204.26.12.9...

  • Page 12: Configuration 3 - New Dual-Lan With T1 Dsu

    Internet Services Network is outside the firewall enabling Internet users to access (through ETHERNET 2) the public LAN resources, such as the Web, FTP, etc. servers. In this arrangement, the Internet connection is provided through a T1 DSU connected to the RS232/V.35 connector on the back panel of the Firewall.

  • Page 13: Specifications

    Power Consumption - 10 Watts • Dimensions - 1.625" high x 6" wide x 9" deep 5.63 cm high x 22.34 cm wide x 22.34 cm deep • Weight - 2 pounds (.92 kg) MTPSR1-120 Chapter 1 - Introduction and Description...
  • Page 14 Firewall User Guide MTPSR1-120...

  • Page 15: Chapter 2 - Installation

    Chapter 2 - Installation...

  • Page 16: Safety Warnings

    Guide. Inspect the contents for signs of any shipping damage. If damage is observed, do not power up the unit, contact Multi-Tech’s Technical Support for advice (refer to observed, place the Firewall in its final location and continue with the next section.

  • Page 17: V.35 Shunt Procedure

    7. While supporting the back panel, turn the Firewall over again, and replace the cabinet mounting screw. 8. Turn the Firewall right side up again and proceed to the next section to connect the cables. MTPSR1-120 Chapter 1 - Introduction and Description Figure 2-2. Cabinet Mounting Screw...

  • Page 18: Cabling Your Firewall

    Dual Ethernet ProxyServer User Guide Cabling Your Firewall Cabling your Firewall involves making the proper Power, Command Port, and two Ethernet connections. An optional WAN connection is provided to connect to an external WAN device. Before connecting cables to your Firewall, consider the following cabling alternatives: 1.
  • Page 19 4. To connect a cable modem, DSL modem, or your Internet (public) LAN, connect one end of an RJ-45 (UTP) cable to the ETHERNET 2 jack on the back of the Firewall; then connect the other end to your modem or Internet LAN. Proceed to step 6. 5.
  • Page 20 Dual Ethernet ProxyServer User Guide...

  • Page 21: Chapter 3 - Software Loading And Configuration

    Chapter 3 - Software Loading and Configuration...

  • Page 22: Loading Your Software

    TCP/IP stack, refer to Chapter 5, Client Setup. 2. Insert the Firewall CD-ROM into the CD-ROM drive on your local PC. The CD-ROM should start automatically; however, it may take 10 to 20 seconds for the Multi-Tech Installation CD screen to appear.
  • Page 23 Firewall. Click OK to continue. If you need to configure your Firewall through the COM port, follow the instructions in the dialog box for selecting COM Port, then click OK to continue. MTPSR1-120 Chapter 3 - Software Loading and Configuration...

  • Page 24: Wizard Setup

    Internet LAN Port, set up the Gateway Parameters, and then do the same for the WAN port, if it is used. 9. Click Yes to run the Wizard Setup. Clicking No takes you to the program group (icons), where you can choose a utility from the program group. MTPSR1-120...

  • Page 25: Ip Wizard Setup

    IP Address, Net Mask, and DNS Server addresses for your Internet LAN. Follow the onscreen instructions and enter a Gateway IP Address, too, if the DHCP function is disabled. Internet LAN (ETHERNET 2) Setup MTPSR1-120 Chapter 3 - Software Loading and Configuration...
  • Page 26 Internet is through the WAN port, follow the onscreen instructions: select WAN in the Gateway Parameters group, then enter a Host Name in the field provided. 13. Click OK when you are finished configuring the IP parameters. The Default WAN Link(s) Setup dialog box is displayed. MTPSR1-120...

  • Page 27: Default Wan Link Configuration

    18. Click Password and enter the password you negotiated with your ISP. The password can be up to 15 alphanumeric characters and also is usually not case sensitive. Click OK to proceed. 19. The following dialog box is displayed. MTPSR1-120 Chapter 3 - Software Loading and Configuration...
  • Page 28 Firewall is rebooted. This may take a couple minutes to go Off. 22. You are returned to the Multi-Tech Installation CD screen where you can now install (on your PC’s hard drive) either Acrobat Reader (by clicking the Acrobat Reader icon) or the User Guide.

  • Page 29: Chapter 4 - Firewall Software

    Chapter 4 - Firewall Software...

  • Page 30: Introduction

    Start | Programs | Firewall Version 3.00 | (utility), or by double-clicking the applicable shortcut icon in the program group in My Computer (i.e., C:\Windows\Start Menu\Programs\Firewall Version 3.00 in Windows 95/98/NT). The program group is shown here: MTPSR1-120...

  • Page 31: Firewall Setup

    IP settings, define the WAN ports, change features such as the Internet, DHCP Server, Proxy Server, and Virtual Servers, display statistics on the WAN port, control activation of Telnet, TFTP, and Web servers and dumb terminal management, test the communications link, print messages received from the target Firewall, and download setup information to the Firewall.

  • Page 32: Changing Ip Parameters

    Internet through the WAN to the DHCP server. If this option is enabled, the DHCP Server Address field becomes active, awaiting entry of the IP address of the DHCP server. DHCP Server Address - If the DHCP Relay Agent option is active, enter the IP address of the DHCP server in this field. MTPSR1-120...
  • Page 33 In the example below, a data packet sent from the remote client PC to access the remote Internet through the MTPSR1-120 must have IP Address 200.1.1.0 and Gateway Address 192.168.2.1 (entered as the Static Route configuration).
  • Page 34 Mask is the IP subnetwork mask (255.255.255.0) of the target host, and the Metric is the hop count (1) to the target host. Once you have entered all the necessary information, click OK. The static route is displayed in the window on the IP Static Routes dialog box. MTPSR1-120...

  • Page 35: Changing Ppp/Slip Parameters

    The Firewall will automatically bring up the line again the next time data is available. Note: Dial On Demand is not supported if a Direct Connect Method is selected on the WAN Port Setup dialog box. MTPSR1-120...
  • Page 36 Script Enable option should be activated. To compile, edit, or download a script, click the Script button. If you also want to Restart Script on Communication Failure, then activate that option. Script commands and a typical example of a script are provided in Appendix C. MTPSR1-120...

  • Page 37: Enabling The Dhcp Server

    Chapter 4 - Firewall Software Enabling the DHCP Server The Multi-Tech Dynamic Host Configuration Protocol (DHCP) Server feature of the Firewall manages all the IP address assignments on the local/private LAN; thus, IP address management becomes completely transparent. The DHCP Server maintains a list of available IP addresses, and when a client computer asks for an address, the DHCP Server sends the IP Address to the client.

  • Page 38: Adding Proxy Applications

    Once it has this information, the Firewall will route packets through to the Internet from the unknown software. Note: Adding applications may decrease performance speed and increase security risks; therefore, you may want to delete unused or rarely used applications. MTPSR1-120...
  • Page 39 Port and Data Port numbers from their reserved values (21 and 20, respectively, as shown below on the FTP Port Numbers Configuration dialog box). If you do change these numbers, be sure to notify all users who need to access the FTP server. MTPSR1-120...

  • Page 40: Adding Virtual Servers

    The virtual server feature of the ProxyServer enables you to have multiple servers on your local area network (LAN) with one static IP address (from your ISP or Multi-Tech’s Global Dynamic WAN Addressing) assigned to the WAN port (if used). A normal Internet connection requires a static IP address for each server on your LAN.
  • Page 41 Chapter 4 - Firewall Software If instead of mapping a static IP address from your ISP, you employed Multi-Tech’s Global Dynamic WAN port addressing method, you can assign a predefined Global Dynamic WAN port address to the Firewall’s WAN port and then map your servers to that WAN port address the same way you map a static IP address from your ISP.
  • Page 42 Had we accessed the Internet through the Firewall’s WAN port (instead of the Router), we could’ve mapped the three servers on the Private LAN to a Global Dynamic WAN port address. Everything else on the Virtual Server Setup dialog box would be the same as shown on the above screen.

  • Page 43: Managing Various Applications

    SNTP Client dialog box, where you can enable or disable SNTP Client (enabling client programs to access an SNTP server through the Firewall using the UDP protocol and port 123). The SNTP server enables you to access accurate clocks and other sources of time base information. MTPSR1-120...

  • Page 44: Running Statistics

    Packets group displays the total accumulated packet traffic and the Bytes group shows the total accumulated byte-traffic for the current connection. For additional details and parameter ranges for specific fields on the statistics dialog box, refer to the Helps. MTPSR1-120...

  • Page 45: User - Filter Management

    WAN port (Port Number 1). This dialog box also enables you to edit an existing filter you’ve selected (highlighted) in the list on the Filter tab of the UserFilter Database dialog box. MTPSR1-120...

  • Page 46: User Management

    ENGINEERING, ACCOUNTING, or SALES. Click the lower Add button to begin building your database of Groups; this will display the Groups (Add) dialog box, where you can assign the Group Name, Group Description, and User Permission. MTPSR1-120...

  • Page 47: Access Rights

    Access Rights tab. After they are added to this tab, the range entries can be edited or deleted as necessary. For a more detailed description of Access Rights, refer to the Helps provided with your Firewall software. MTPSR1-120...

  • Page 48: User Monitoring

    Monitoring icon on the Firewall Version 3.00 icon group, if it is open on your desktop) opens the UserLog dialog box. This screen displays a list of Available Servers, a Selected Server, Online Users Information (always empty when opened), and a growing list of any Event Messages that have occurred while this dialog box was open and/or open but minimized.

  • Page 49: Chapter 5 - Client Setup

    Chapter 5 - Client Setup...

  • Page 50: Introduction

    A checklist is provided toward the end of each procedure (Steps 16 and 19, respectively) so you can record all the pertinent information required for the connection between your PC and the Firewall. Keep the completed checklist as a reference for future upgrades. MTPSR1-120...

  • Page 51: Configuring In Windows 98/95

    The Network dialog box (Configuration tab) is displayed which shows all the network components (e.g., clients, adapters, protocols, and any services) installed on your PC. 2. If TCP/IP is listed, proceed to step 3; otherwise, refer to Installing TCP/IP (Win98/95), at the end of this section. MTPSR1-120 Chapter 5 - Client Setup...
  • Page 52 Note: There may be other protocols listed and enabled under your Ethernet adapter. This does not affect the TCP/IP protocol. Rather, it simply means your computer will accept messages using those protocols as well as TCP/IP. Select TCP/IP, then click Properties to open the TCP/IP Properties window. MTPSR1-120...
  • Page 53 If DHCP Services are NOT active on the Firewall, you will have to manually enter your IP address. Select manual addressing by clicking the Specify an IP address option. The IP Address and Subnet Mask fields become active. MTPSR1-120 Chapter 5 - Client Setup...
  • Page 54 “dots.” If a group has fewer than 3 digits, type the necessary digits and press the space bar to move to the next group. When you are finished, verify that the IP address is identical to the IP address you were given for your PC. Click the Gateway tab. MTPSR1-120...
  • Page 55 In the New gateway field, enter the IP address of the Firewall’s Ethernet port and click Add. The new gateway address is displayed in the list of Installed gateways. Click the DNS Configuration tab. Verify that Enable DNS is selected (checked). MTPSR1-120 Chapter 5 - Client Setup...
  • Page 56 When this is done, click OK. You are returned to the Network dialog. In the Network dialog, Click OK. You are returned to the Control Panel. Use the following checklist to record all the configuration settings for future use: MTPSR1-120...
  • Page 57 IP applications (e.g., browser, Telnet, or FTP). Set up each application as “No Proxy” or equivalent; or, connect to the Internet over the LAN. To further validate your connection to the Firewall, “Ping” the IP address of the Firewall. MTPSR1-120 Configuration Checklist Chapter 5 - Client Setup...

  • Page 58: Installing Tcp/Ip (Win98/95)

    Reboot your PC for changes to take effect. Click Start | Settings | Control Panel and double-click the Network icon to return to the Network dialog. Return to step 3 of the Configuring in Windows 98/95 and continue with the client setup procedure. MTPSR1-120...

  • Page 59: Configuring In Windows Nt

    TCP/IP Protocol listed, proceed to step 4. If TCP/IP is not listed, you must install it prior to proceeding. Refer to Installing TCP/IP (WinNT) at the end of this section. Click the Bindings tab. MTPSR1-120 Chapter 5 - Client Setup...
  • Page 60 Note: There may be other protocols in the list under your Ethernet adapter. This does not affect the TCP/IP protocol. Rather, it simply means your computer will accept messages using those protocols as well as TCP/IP. Click the Protocols tab. MTPSR1-120...
  • Page 61 If DHCP Services are NOT active on the Firewall, you will have to manually enter your IP address. Select manual addressing by clicking the Specify An IP Address option. The IP Address and Subnet Mask fields become active. MTPSR1-120 Chapter 5 - Client Setup...
  • Page 62 In the Subnet Mask field, type the subnetwork mask assigned by your administrator. When you are finished, verify the new mask. In the Default Gateway field, type the IP address of the gateway assigned to your LAN. When you are finished, verify the new gateway. MTPSR1-120...
  • Page 63 In the DNS Server Search Order group, click Add. The TCP/IP DNS Server dialog box is displayed. In the DNS Server field, place the cursor in the first group and type the IP address of your LAN’s DNS server (provided by your network administrator). MTPSR1-120 Chapter 5 - Client Setup...
  • Page 64 IP applications (e.g., browser, Telnet, or FTP). Set up each application as “No Proxy” or equivalent; or, connect to the Internet over the LAN. To further validate your connection to the Firewall, “Ping” the IP address of the Firewall. Configuration Checklist MTPSR1-120...

  • Page 65: Installing Tcp/Ip (Winnt)

    Reboot your PC for changes to take effect. Open the Control Panel and double-click the Network icon to return to the Network Configuration window, then go to step 4 of the Configuring Windows NT procedure. MTPSR1-120 Chapter 5 - Client Setup...
  • Page 66 Firewall User Guide MTPSR1-120...
  • Page 67 Chapter 6 - Remote Configuration...

  • Page 68: Introduction

    If your Modem Initialization String, Initialization Response, or Connect Response values are different than the defaults in the dialog box, refer to your modem user documentation and change the default values to match your modem. in this chapter to configure a remote Firewall. MTPSR1-120...
  • Page 69 Port Setup dialog box. 14. At the remote site, reconnect the Firewall to the serial port of the PC and from the Firewall program group double-click the Firewall Configuration icon to verify that the Firewall is running. MTPSR1-120 Chapter 6 - Remote Configuration...

  • Page 70: Lan-Based

    (or setup) and download the changes to the remote Firewall unit. Refer to Chapter 4 for a description of the Firewall software. For definitions of each dialog box or fields within a dialog box, refer to the Helps provided with your Firewall software. MTPSR1-120...
  • Page 71 The remote Firewall will be brought down, the new configuration written to the unit, and the unit will reboot. 9. Click Exit when the downloading is complete. 10. Double-click the Firewall Configuration icon in the Program Manager screen once more to verify that the Firewall is running. MTPSR1-120 Chapter 6 - Remote Configuration...
  • Page 72 Firewall User Guide MTPSR1-120...

  • Page 73: Chapter 7 - Firewall Management

    Chapter 7 - Firewall Management...

  • Page 74: Introduction

    When the Connect to remote host dialog box is displayed, a Host Name has to be entered. In this example, the IP Host Name is 192.168.2.4. Enter your Firewall IP Address in the Host Name field. Click the Connect button and the Firewall Management Menu is displayed. MTPSR1-120...

  • Page 75: Firewall Management Menu

    System Information screen. Firewall Configuration Selecting Option 2 displays the Firewall Configuration menu with options that enable you to configure Firewall parameters, set up various servers, or reset the Firewall. For more details on Firewall configuration, refer to WAN Device Configuration Selecting Option 3 (on the Firewall Management Menu screen) displays the WAN Device Configuration options, which enable you to gain direct access to the DCE device on the WAN port.

  • Page 76: Web Browser Management

    To log in to the Firewall configuration program, click the words, “click here.” The Enter Network Password screen is displayed. Type supervisor in the User Name field (no password is needed), then press Enter or click OK. The default Framed View of the Firewall Configuration screen is displayed. Chapter 4 - Firewall Software). MTPSR1-120...
  • Page 77 Chapter 7 - Firewall Management From this screen you can either access any of the configuration options or switch to the Standard View (below) to access the same options. Refer to Chapter 4 - Firewall Software for descriptions of the various options. MTPSR1-120...
  • Page 78 Firewall User Guide MTPSR1-120...

  • Page 79: Chapter 8 - Warranty, Service And Tech Support

    Chapter 8 - Warranty, Service and Tech Support...

  • Page 80: Introduction

    Internet. Limited Warranty Multi-Tech Systems, Inc. (“MTS”) warrants that its products will be free from defects in material or workmanship for a period of two years from the date of purchase, or if proof of purchase is not provided, two years from date of shipment. MTS MAKES NO OTHER WARRANTY, EXPRESSED OR IMPLIED, AND ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED.

  • Page 81: Tech Support

    Tech Support Multi-Tech has an excellent staff of technical support personnel available to help you get the most out of your Multi-Tech product. If you have any questions about the operation of this unit, call 1-800-972- 2439. Please fill out the Firewall information (below), and have it available when you call. If your Firewall requires service, the tech support specialist will guide you on how to send in your Firewall (refer to the next section).

  • Page 82: Service

    Firewall User Guide Service If your tech support specialist decides that service is required, your Firewall may be sent (freight prepaid) to our factory. Return shipping charges will be paid by Multi-Tech Systems. Include the following with your Firewall: •...

  • Page 83: About The Internet

    About the Internet Multi-Tech is a commercial user on the Internet, and we retrieve messages from our customers on a periodic basis. Multi-Tech’s presence includes a Web site at: http://www.multitech.com and an FTP site at: ftp://ftp.multitech.com Ordering Accessories SupplyNet, Inc. supplies replacement transformers, cables and connectors for select Multi-Tech products.
  • Page 84 Firewall User Guide MTPSR1-120...

  • Page 85: Appendixes

    Appendixes...

  • Page 86: Appendix A - Tcp/Ip (Transmission Control Protocol/Internet Protocol) Description

    First, choose a domain name for your company. A domain name is the unique Internet name, usually the name of your business, that identifies your company. For example, Multi-Tech’s domain name is multitech.com ( .com indicates this is a commercial organization; .edu denotes educational organizations, .gov denotes government organizations).
  • Page 87 • DNS: the Domain Name System defines the structure of Internet names and their association with IP addresses, as well as the association of mail, name, and other servers with domains. • SNMP: the Simple Network Management Protocol defines procedures and management information databases for managing TCP/IP-based network devices.
  • Page 88 You first choose a domain name for your company. A domain name is the unique Internet name, usually the name of your business, that identifies your company. For example, Multi-Tech’s domain name is multitech.com (where .com indicates this is a commercial organization; .edu denotes educational organizations, .gov denotes government organizations).

  • Page 89: Appendix B - Cabling Diagrams

    Device Ethernet Cables (10BaseT) Circuit Signal Name Data Transmit Positive Data Transmit Negative Data Receive Positive Data Receive Negative Command Port Cable (RJ-45) MTPSR1-120 DB-25 25-Pin DB-25 25-Pin Connector (Male) Connector (Female) Protective Ground Signal Ground Request To Send Clear To Send...
  • Page 90 Data Set Ready Data Carrier Detect Data Terminal Ready Transmit Data A Receive Data A Transmit Data B Receive Data B External TX Clock A Receive Clock A External TX Clock B Receive Clock B Transmit Clock A Transmit Clock B MTPSR1-120...

  • Page 91: Appendix C - Script Commands

    Help file in your Firewall software. Following the list of commands is an example script. Commands (by Function) Dial, Connection and Remote Mathematical functions Miscellaneous Program constructs String operations MTPSR1-120 Appendix C - Script Commands...

  • Page 92: Example Script

    (“^M”); if (waitfor (password_prompt,timeout)) then transmit (password); transmit (“^M”); if (waitfor (shell_menu,timeout)) then transmit (shell_menu_response); transmit (“^M”); else transmit (“Shell Menu Not Received^M”); endif else transmit (“Password Prompt Not Received^M”); endif else transmit (“Login Prompt Not Received^M”); endif Endproc MTPSR1-120...

  • Page 93: Appendix C - Regulatory Information

    EMC and Safety Directive Compliance The CE mark is affixed to this Multi-Tech product to confirm compliance with the following European Community Directives: Council Directive 89/336/EEC of 3 May 1989 on the approximation of the laws of Member States relating to electromagnetic compatibility.
  • Page 94 Dual Ethernet ProxyServer User Guide MTPSR1-120...

  • Page 95: Glossary Of Terms

    Glossary of Terms...
  • Page 96 Backward Explicit Congestion Notification (BECN): A bit that tells you that a certain frame on a particular logical connection has encountered heavy traffic. The bit provides notification that congestion-avoidance procedures should be initiated in the opposite direction of the received frame. See also FECN (Forward Explicit Congestion Notification). MTPSR1-120...
  • Page 97 PABX or any residential telephone connects to the PSTN at a central office. Centrex: A multi-line service offered by operating Telcos which provides, from the Telco CO, functions and features comparable to those of a PBX for large business users. See also “Private Branch Exchange”, “Exchange”. MTPSR1-120...
  • Page 98 Data Link Connection Identifier (DLCI): One of the six components of a frame relay frame. Its purpose is to distinguish separate virtual circuits across each access connection. Data coming into a frame relay node is thus allowed to be sent MTPSR1-120...
  • Page 99 DNS server; a domain name which fails to provide both primary and secondary DNS servers is known as a “lame delegation.” Driver: A software module that interfaces between the Operating System and a specific hardware device (e.g., color monitors, printers, hard disks, etc.).
  • Page 100 Foreign Exchange Office (FXO): provides local telephone service from a CO outside of (“foreign” to) the subscriber’s exchange area. In simple form, a user can pick up the phone in one city and receive a tone in the foreign city. Connecting a MTPSR1-120...
  • Page 101 Internet Protocol (IP): A protocol used to route data from its source to its destination in an Internet environment. The Internet Protocol was designed to connect local area networks. Although there are many protocols that do this, IP refers to the global system of interconnecting computers. It is a highly distributed protocol (each machine only worries about sending MTPSR1-120...
  • Page 102 LATAs. The Bell Operating Companies (BOCs) provide Intra-LATA services. Local Exchange Carrier (LEC): The local phone company which provides local (i.e., not long distance) transmission services. AKA “telco”. LECs provide T1 or FT1 access to LDCs (unless the T1 circuit is completely intra-LATA). Inter-LATA MTPSR1-120...
  • Page 103 Node: Any point within a network which has been assigned an address. Object-Oriented: A method for structuring programs as hierarchically organized classes describing the data and operations of objects that may interact with other objects. MTPSR1-120...
  • Page 104 The OSI Reference Model defines four types of primitives: Request, Indication, Response and Confirm. Private Branch Exchange (PBX): A telephone exchange located on the customer’s premises. The PBX provides a circuit MTPSR1-120...
  • Page 105 “robbed” every sixth frame to convey voice-related signaling information such as on-hook, off-hook, etc., for each channel. Router: A device that connects two networks using the same networking protocol. It operates at the Network Layer (Layer 3) of the OSI model for forwarding decisions. MTPSR1-120...
  • Page 106 Compare to Asynchronous Transmission. Systems Network Architecture (SNA): The description of the logical structure, formats, protocols, and operational sequences for transmitting information units through, and controlling the configuration and operation of networks. MTPSR1-120...
  • Page 107 Transport Layer: Layer 4 of the Open Systems Interconnection (OSI) model; provides reliable, end-to-end delivery of data, and detects transmission sequential errors. Transport Protocol Data Unit (TPDU): A transport header, which is added to every message, contains destination and source addressing information that allows the end-to-end routing of messages in multilayer NAC networks of high MTPSR1-120...
  • Page 108 Contrast “Red Alarm” and “Blue Alarm”. Zero Byte Time Slot Interchange (ZBTSI): A method for allowing 64 Kbps unrestricted user data (allowing all 0s in the user data). An alternative to (but not as popular as) B8ZS. MTPSR1-120...

  • Page 109: Index

    Index Accessories, ordering ... 83 Adding Proxy Applications ... 38 Applications ... 38 Archie ... 87 Back Panel ... 9 Connectors ... 9 Cabinet Mounting Screw ... 17 Cabling Your ProxyServer ... 18 Changing IP Parameters ... 32 Changing WAN Port Parameters ... 35 Client Setup ...
  • Page 110 Firewall User Guide ProxyServer Telnet server menu ... 75 Regulatory information EMC and safety directive compliance ... 93 RS232/V.35 Connector ... 9 Safety Warnings ... 16 Scripting Commands (by function) ... 91 Example script ... 92 Secured LAN Port Parameters ... 32 Service ...

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