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.
Introduction Welcome to Multi-Tech's new RASFinder™ Model MTASR3-200, a Remote Access Server (RAS) for remote dial-in access and LAN-to-LAN routing capability. The RASFinder 200-Series is a remote access device that supports up to three concurrent dial-in sessions and IP or IPX remote access.
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Chapter 5 - RAS Dial-Out Redirector Chapter 5 describes how Multi-Tech’s Remote Access Server for Microsoft network users enables them to dial out and fax out through the MTASR3-200. It provides information on installing and configuring the WINMCSI modem-sharing software.
Front Panel The front panel has four groups of LEDs that provide the status of the LAN connection and link activity. Two other LEDs indicate the general status of the RASFinder. The Ethernet LEDs display the activity of the LAN, i.e., whether the RASFinder is connected to the LAN, transmitting or receiving packets, or if a collision is in progress.
Back Panel The cable connections for the RASFinder are made on the back panel. Three groups of cables are used on the RASFinder: the Command port, three RJ-11 ports (Links 1, 2, and 3), and the Ethernet port. The cable connections are shown in Figure 1-3 and defined in the following groups. Link Connectors (Links 1, 2, and 3) These Link connectors are used to connect the RASFinder to a WAN.
Specifications The RASFinder conforms to the following specifications: • Routing Protocols - IP and IPX, and bridging for all others • Ethernet LAN Interface - 10Base-T (twisted pair) • WAN Interface - 3 async (RS232) Links with RJ-11 jacks • Command Port - 19.2 Kbps Asynchronous •...
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 Chapter 7). If no damage is observed, place the RASFinder in its final location and perform the procedures in the section on “Cabling Your RASFinder.”...
Cabling Your RASFinder Cabling your RASFinder involves making the proper WAN, Ethernet, Command port, and Power connections. Should you need to install additional RAM, or replace a SIMM module some time in the future, refer to the next section on “Adding RAM”. Note: If additional RAM is needed, perform the procedure in the next section, “Adding RAM”.
Adding RAM A second SIMM connector is provided for adding RAM to the RASFinder. The procedure for adding RAM follows. 1. Ensure that the external power supply is disconnected from the RASFinder. 2 . Turn the RASFinder upside down and remove the cabinet mounting screw at the center/back of the cabinet.
Remote User Data base utility to establish your remote user profiles. You can also configure the RASFinder as a router for LAN-to-LAN routing. The RASFinder CD-ROM contains your RASFinder software, Quick Start and this User Guide. The CD-ROM is auto-detectable and should start automatically when inserted into your CD-ROM drive.
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4. The Choose Destination Location dialog box displays. Follow the onscreen instructions to install your RASFinder software. You can either choose a different Destination Location for your RASFinder software by clicking Browse, or select the default destination by pressing Enter or clicking Next>. It is recommended that you accept the default folder, C:\RASFind.xxx 5.
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11. The Default Parameters dialog box displays. This dialog box allows you to enable or disable IPX routing, assign the router name (required for IPX routing), establish the IP address and mask for the LAN port, set up remote addresses for the WAN ports, and disable unused WAN ports.
IPX Routing Setup 13. Router Name: If this is the only RASFinder on your network, you can use the default Router Name (MTROUTER); otherwise, you must assign a new Router Name in this field. The Router Name can be any printable ASCII string of up to 8 characters (can be mixed uppercase and lowercase).
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Setting Up Remote Access Dial In User Server (RADIUS). For Routing, proceed to the last section (Final Routing Setup) in this chapter to set up the RASFinder as a router. MTASR3-200 Chapter 3 - Software Loading and Configuration...
Setting Up Your Remote User Database The propreitary Remote User Data Base supports remote dial-in users for user name, password, and port availability. Each dial-in user needs an entry in this database. You can add remote users, remove users, or edit information in the database. 1.
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4. Build your user database by filling in the following fields for each user. User Name The User Name can have as many as 39 characters. All printable characters are permitted with the restriction that no blanks are allowed in the user name. In dial-in and dial-out applications, the user name is treated as a case insensitive string.
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5. The User Permissions dialog box displays. 6. Build your user permissions by filling in the following fields for each remote user. Auto Protocols This group enables the systems administrator to assign unrestricted LAN/Intranet access or limited protocol access. You have the following three options. •...
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Protocols The Protocols group enables you to limit the remote user to IP routing, IPX routing, or bridging (Spanning Tree); or, a combination of any two or all three routing protocols. The default setting enables all three protocols. User Service Types The User Service Types group enables you to set the permissions for the entry being configured.
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9. The Add/Edit Filters dialog box displays. 10. Build your filtering parameters by filling in the following fields for each remote user. This field requires a unique ID identifying the remote user. The ID can be the name of a person, a work station, or a remote user identified simply as “User 1”.
RASFinder Configuration icon in the RASFinder x.xx icon group window when it displays on your desktop. 2. The main menu (Router Setup) displays. Click PPP / SLIP to continue. 3. The PPP Port Setup dialog box displays; click the Advanced tab.
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12. A set of default attribute values will be displayed in the Attribute Values group. These default values are used with the Multi-Tech Radius Server. You do not have to change these values if your RASFinder is communicating with Multi-Tech’s Radius Server. If you are using another vendor’s Radius Server to communicate with your RASFinder, you will have to communicate with...
1. From your desktop, click Start | Programs | RASFinder x.xx | RASFinder Configuration, or double-click the RASFinder Configuration icon in the RASFinder x.xx icon group window when it displays on your desktop. 2. The main menu (Router Setup) displays. Click PPP/SLIP button to continue. 3. The PPP Port Setup dialog box displays.
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4. If you are going to combine the three WAN ports together, i.e., a single IP address, you need to enable the MLPPP option from the Advanced tab. Note: When the dialog box “When a PPP port is Client-or-LAN type:” appears, click on the OK button each time the dialog box appears.
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6. On the WAN 1 tab, change the Port Address and Remote Address groups to be on separate networks from the Ethernet LAN port. If you enabled MLPPP option on the PPP Port Setup dialog box, the IP addresses for all three WAN ports have to be identical and the remote WAN port addresses have to be within the same network and identical.
The RASFinder software enables you to refine your configuration based on your network connections. The software is based on a main menu (RASFinder - Router Setup) that enables you to consider all the parameters for a particular feature (e.g., IP or IPX protocol, Bridging, or setting up a WAN port for PPP or SLIP protocol).
Configuration icon in the RASFinder program group, if it displays on your desktop. After loading, the RASFinder - Router Setup menu displays. The RASFinder - Router Setup menu consists of 13 buttons that enable you to display and change your protocols, define the output of the RASFinder, perform network management functions, test the communications link, print messages received from the target RASFinder, and download setup information to the RASFinder.
(RAS) to permit remote users to dial into a local area network and use the resources of that network and (2) as a Router for LAN-to-LAN routing. The RASFinder defaults to a RAS configuration during the initial software loading. Typical examples of both types of applications are presented in the following paragraphs.
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Chapter 4 - RASFinder Software network. The address assigned to the Ethernet port of the RASFinder can be any address that is recognizable by your network’s backbone. After you enter your LAN IP address information and three sequential WAN addresses have been automatically placed in the Remote address for WAN 1, 2, and 3 fields, ensure that the Enable IP Routing on WAN 1, 2, and 3 are checked.
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Chapter 4 - RASFinder Software attributes or any other custom attributes on the Radius Security Server. The Enable RADIUS option enables communication between the Radius server and the RASFinder. Enable Accounting option activates the accounting features which allow the Radius server to track the number of bytes sent and received, login and logout times, port number, etc.
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Chapter 4 - RASFinder Software RAS Application using Remote User Database The initial software loading process would be the same as for the RAS application using Radius, except that now instead of setting up Radius parameters, you will assemble a Remote User Database.
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Chapter 4 - RASFinder Software information (for one remote user at a time) via the Add Users dialog box. The user name and password in this application must be negotiated between the RASFinder administrator and each remote user. User names can be up to 39 characters long, with any printable characters; however, no spaces are allowed within the names.
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Chapter 4 - RASFinder Software Inbound Permissions using Telnet, or Inbound using Rlogin. The time of day and days in which the user can access the network are the final items in the User Permissions dialog box. Once this is established for each user and the user database is loaded into the RASFinder, all the remote users can dial into the network and access the network resources according to the restrictions/permissions on this dialog box.
The second basic application for the RASFinder is LAN-to-LAN routing as shown in Figure 4-3. The RASFinder is initially configured for a RAS application. To configure the RASFinder for a router application, you have to change the WAN port addresses to be on a different network from the LAN port.
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Chapter 4 - RASFinder Software from a RAS application to a routing application. The PPP/SLIP (Point-to-Point/Serial Line Internet Protocol) button displays the PPP Port Setup dialog box with the WAN 1 tab active. In the Remote Port Setup group in the lower right of the dialog box, change from the Client only option to the Client or LAN (as shown below);...
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Chapter 4 - RASFinder Software You must now decide which protocol your LAN is using and choose that protocol from the main menu. For example, to configure the RASFinder for IP, the Port IP Address and IP Mask fields in the IP Port Setup dialog box display the information that was entered earlier for your Default Parameters during initial software loading.
Redirect message to the source IP address. The most likely cause of this message is the delivery of a datagram to a router that is not on the forwarding path to the destination address. This is often due to a wrong configuration of the IP client sending the datagram. The packet causing the ICMP Redirect message to be transmitted is forwarded to the appropriate router.
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For example, when RIPv2 is being run on a network along with another IGP, and one router is running both protocols, then that router can indicate to the other RIPv2 routers that a better next-hop than itself exists for a given destination.
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RIP response time and RIP route aging time). When the router is configured for remote access, the DNS Resolver needs to be enabled so that applications such as the terminal server will support Domain Names. The dotted decimal IP address of the Local DNS server should be entered in the field provided.
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Now, for our second example of an unnumbered link where we want a server on a remote network to appear as a device on a router on the corporate LAN that is pointed toward the Internet. Let say that the Manuals Server on the Publications Network contains the released manuals that a customer can down load from the corporate network.
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Gateway Address option becomes inactive. Now, for the IP Address field we want the address of the Internet router on the Corporate LAN which in our unnumbered example is 192.168.2.220. In order for the Manuals server on the Publications network to appear on the Corporate LAN, we need to subnet the Manuals server with an Address Mask of 255.255.255.224.
Filters The network administrator can set up filters on the RASFinder for better control. Filtering can be used when you want to block all packets originating from a specific destination (called source address filtering) or all packets heading for a particular destination (called destination address filtering). Filters can be set up to exclude packets of a particular protocol (TCP or UDP) or any particular field in a LAN packet.
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Chapter 4 - RASFinder Software Add/Edit IP Port Filter dialog box, the protocol that is going to be filterred is TCP, the physical port on which the filtering is going to take place is the LAN port, the protocol port is telnet which translates into protocol port number 0023 in the filtering list window, and the filter type is Filter on Destination Port which means to drop all IP packets whose destination protocol port is telnet.
Bandwidth Optimization Group Discard Serialization Packets, when enabled (checked), causes the IPX router to discard Novell Netware File Server serialization security frames received from the specified virtual IPX port. Novell Netware File Servers implement broadcast frames, often referred to as security frames, that contain serialization information regarding the license of the file server executable.
IPX Filters The network administrator can set up filters on the RASFinder for better control. IPX packet filtering can be set up to selectively filter or forward packets based on the IPX address. Filtering can be used when you want to block all packets originating from a specific destination (called source address filtering) or all packets heading for a particular destination (called destination address filtering).
Spanning Tree Setup This dialog box lets you configure the parameters for transparent bridging or bridging using Spanning Tree Algorithm as specified in IEEE 802.1d standard. Transparent bridging occurs between two remote Ethernet LANs. Spanning Tree Algorithm is a protocol specified by the IEEE 802.1d standard for use by bridges to perform bridging.
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Chapter 4 - RASFinder Software performance degradation. The add or edit Spanning Tree Filter dialog box allows you to enter the Ethernet address (for example 15345678) to which you want to apply filtering, the physical port (WAN 1) on which the filtering is going to be applied, and the filter type in our example of Filter Destingation Address.
Answering or Dialing. If Dialing is enabled, then the number to be dialed has to be entered in the Dial Number field. The entry Multi-Tech 56K Socket Modem in the Modem Types field refers to the built-in modem installed in the RASFinder.
You can set up the RASFinder to bring down the connection on the WAN link when there is no real data traffic on the line; the router will then automatically bring up the WAN link when data is available to go across the link.
In addition to local configuration, the RASFinder supports various applications that enable remote viewing and changing of the configuration from anywhere on the connected internetwork. To manage these applications, click Others on the Router Setup menu. The Applications Setup dialog box appears.
Client The information provided in this section enables multiple users to configure their PCs to access the LAN through a RASFinder. The RASFinder was configured by the administrator who, while installing the software, determined that the RASFinder would either automatically assign Internet (IP) addresses, or require that they be assigned manually to each client PC.
Introduction Multi-Tech’s Remote Access Server for Microsoft network users enables users to dial-out and fax-out through your MTASR3-200. Remote Access Solution software uses Multi-Tech’s Communications Services Interface (MCSI - pronounced “Mik-see”). MCSI is a software redirector which complies with MCSI/NCSI/NASI defacto standards for software redirection.
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6. The Choose Destination Location screen displays. Click Next to accept the Destination Folder, or click Browse to select a different destination. 7. The Select Program Folder screen displays. Click Next to accept the new folder designation, or choose an existing folder from the list provided. 8.
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Chapter 5 - RAS Dial-Out Redirector Note: If the software redirector is set up as IPX, the IPX option must be selected in the Applications Setup dialog box. If the software redirector is set up as IP, the IP option must be selected.
Running the WINMCSI Workstation Software WINMCSI has a workstation portion of the software that LAN users run and use to log onto the communications server prior to running datacomm software on their client PCs. The following steps guide you through this process. 1.
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4. If you have not logged into the network, do so now by clicking File | Login, or click Login. The MCSI Login window displays. The Available Servers box lists the names of the available servers. Click the name of the server to which you want to attach, type a User Name and Password in their respective fields, and then click Login.
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Note: Windows 98/95 users will have two additional buttons in this box, the Add Port and the Remove Port buttons. You must click the Add Port button to view Local Ports. Click the Remove Port button to remove Local Ports. If you want to get the first available line, click the Map button and then click the Close button and go to step 7.
Introduction This chapter provides procedures for viewing or changing the configuration of a remote unit. Two methods are provided to access a remote unit; the first method is modem-based and the second method uses IP. Within the IP method, three different applications can be used: 1) LAN-Based configuration using TFTP (Trivial File Transfer Protocol), 2) Telnet as a client application, or 3) a standard Web browser on the Internet.
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8. Once the Dialing Router dialog box completes, the Reading Setup dialog box displays. 9. Once the Reading Setup dialog box completes, the RASFinder - Router Setup dialog box displays. This is the remote RASFinder dialog box. Refer to the on-line Help for a description of each dialog box and field within a dialog box.
3. The Port Setup dialog box displays. Verify that the Communication Type field is set to IP. In the Router IP Address field, enter the IP Address of the remote RASFinder. 4. Click OK when you are satisfied with your selections.
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6. Once the program has completed reading the configuration, the RASFinder - Router Setup dialog box displays. This is the main menu for the remote RASFinder. Refer to the on-line Help for the definition of each dialog box and field within a dialog box.
The TCP/IP stack has to be loaded before the Telnet client (a Windows application) will run. The Telnet Server option has to be selected from the Applications Setup dialog box using the Router Configuration icon and the Others button on the RASFinder - Router Setup dialog box. Double-click the Telnet icon (or shortcut) and a blank Telnet screen displays.
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When the dial-out session is over, the WAN port reverts to its original configuration. RASFinder Management The RASFinder Management option (Option 2) on the RASFinder Management Menu enables a Telnet user to view router statistics or system information; another option enables the remote user to Reset the router. RASFinder Configuration...
Chapter 6 - Remote Configuration and Management WAN Device Configuration The WAN Device Configuration option (Option 4 on the RASFinder Management Menu) allows a remote user (a Telnet client) to put any port in WANTalk mode. Remote User Database The Remote User Database option (Option 5 on the RASFinder Management Menu) allows a remote user to add user information such as Name and Password, callback information, and which protocol stacks to enable or disable.
Web Browser Management The RASFinder can be accessed, via a standard Web browser, from anywhere on the connected Internet. First, WEB Server must be checked (enabled) on the Applications Setup dialog box to enable this function. You can then access the RASFinder Configuration dialog box by typing the IP Address of the unit into the address line of your web browser.
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.
Replacement Parts SupplyNet, Inc., can supply you with replacement power supplies, cables and connectors for selected Multi-Tech products. You can place an order with SupplyNet via mail, phone, fax or the Internet at the following addresses: Mail: SupplyNet, Inc.
Multi-Tech Systems 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, please call 800 972-2439 (USA and Canada) or 763 785-3500 (international and local). Please have product information available.
Appendix A - Cabling Diagrams Command Port Cable LAN Cables Circuit Signal Name TD+ Data Transmit Positive TD- Data Transmit Negative RD+ Data Receive Positive RD- Data Receive Negative WAN Cables MTASR3-200 Description Center Shield Circuit Ring Appendixes...
Appendix B - Script Language A script file can be used to automate certain operations. The script file is a text file containing a sequence of the following commands (listed here according to their functions). This is similar to what you will find in the Help file in your ProxyServer software.
Appendix C - Regulatory Information Class B Statement FCC Part 15 NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a residential installation.
7. No repairs are to be made by you. Repairs are to be made only by Multi-Tech Systems or its licensees. Unauthorized repairs void registration and warranty.
Canadian Limitations Notice Ringer Equivalence Number Notice: The ringer equivalence number (REN) assigned to each terminal device provides an indication of the maximum number of terminals allowed to be connected to a phone interface. The termination on an interface may consist of any combination of devices subject only to the requirement that the sum of the ringer equivalence numbers of all the devices does not exceed 5.
Appendix D - AT Command Summary This Appendix summarizes the AT commands for the RASFinder modems. Command: +++AT<CR> Escape Sequence Values: Description: Puts the modem in command mode (and optionally issues a command) while remaining on-line. Type +++AT and up to ten command characters, then press ENTER. Used mostly to issue the hang-up command: +++ATH<CR>.
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Command: Dial s = dial string (phone number and dial modifiers) Values: Default: none Description: Dial phone number s , where s may up to 40 characters long and include the 0–9, *, #, A, B, C, and D characters, and the L, P, T, V, W, S, comma (,), semicolon (;), !, @, ^ and $ dial string modifiers.
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Command: Monitor Speaker Volume n = 0, 1, 2, or 3 Values: Default: Description: L0 Select low volume. Select low volume. Select medium volume. Select high volume. Command: Monitor Speaker Mode n = 0, 1, 2, or 3 Values: Default: Description: M0 Speaker always off.
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Extended result codes with NO DIALTONE and BUSY . Extended result codes with NO DIALTONE and BUSY . Basic result codes with NO DIALTONE and BUSY . Command: Long Space Disconnect n = 0 Values: Default: Description: Y0 Disable sending or responding to long space break signal on disconnect. Enable sending or responding to long space break signal on disconnect.
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Command: &K n Local Flow Control Selection n = 0, 3, or 4 Values: Defaults: Description: &K0 Flow control disabled. &K3 Enable CTS/RTS hardware flow control. &K4 Enable XON/XOFF software flow control. Command: &M n Communications Mode Values: n = 0 Defaults: Description: &M0 Asynchronous mode.
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Command: \J n Data Buffer Control n = 0 Values: Default: Description: \J0 Enable data buffer—serial port speed is independent of connect speed. Not supported—responds ERROR. \K n Command: Set Break Control Values: n = 5 Default: Description: \K5 Modem sends break signal received from the DTE to the remote modem. \N n Command: Error Correction Mode Selection...
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Command: %C n Data Compression Control n = 0 or 1 Values: Default: Description: %C0 Disable V.42bis/MNP 5 data compression. Enable V.42bis/MNP 5 data compression. Command: +ES=6 Enable Synchronous Buffered Mode Values: Description: Allows an H.324 video application direct access to the synchronous data channel. On underflow, the modem sends HDLC flag idle (0x7E) to the remote modem.
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).
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(connectionless) service. Some applications, such as those that involve a simple query and response, are better suited to the datagram service of UDP because there is no time lost to virtual circuit establishment and termination. UDP’s primary function is to add a port number to the IP address to provide a socket for the application.
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, etc.).
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Glossary Access: The T1 line element made up of two pairs of wire that the phone company brings to the customer premises. The Access portion ends with a connection at the local telco (LEC or RBOC). Accunet Spectrum of Digital Services (ASDS): The AT&T 56K bps leased (private) line service. Similar to services of MCI and Sprint.
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Glossary Basic Rate Interface (BRI): An ISDN access interface type comprised of two B-channels each at 64K bps and one D- channel at 64K bps (2B+D). Bell Operating Companies (BOC): The family of corporations created during the divestiture of AT&T. BOCs are independent companies which service a specific region of the US.
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Glossary Channel: A data communications path between two computer devices. Can refer to a physical medium (e.g., UTP or coax), or to a specific carrier frequency. Channel Bank: A device that acts as a converter, taking the digital signal from the T1 line into a phone system and converting it to the analog signals used by the phone system.
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Glossary across the interface to the specified “address”. The DLCI is confirmed and relayed to its destination, or if the specification is in error, the frame is discarded. Data Terminal Ready (DTR): A control signal sent from the DTE to the DCE that indicates that the DTE is powered on and ready to communicate.
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Glossary E&M: A telephony trunking system used for either switch-to-switch, or switch-to-network, or computer/telephone system-to- switch connection. EIA: The Electronics Industries Association is a trade organization in Washington, DC that sets standards for use of its member companies. (See RS-232, RS-422, RS530.) Encapsulation: A technique used by network-layer protocols in which a layer adds header information to the protocol data unit from the preceding layer.
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Glossary 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 POTS telephone to a computer telephony system via a T1 link requires a channel bank configured for the FX connection.
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Glossary Internet Protocol (IP): A protocol used to route data from its source to its destination in an Internet enviroment. 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.
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Glossary 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 T1 circuits are made up of a combination of Access and Long Haul facilities. Local Management Interface (LMI): A specification for frame relay equipment that defines status information exchange.
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Glossary Office Channel Unit - Data Port (OCU-DP): The CO channel bank used as the interface between the customer’s DSU and the channel bank. Off-hook: The condition of a device which has accessed a phone line (with or without using the line). In modem use, this is equivalent to a phone handset being picked up.
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Glossary Private Branch Exchange (PBX): A phone exchange located on the customer’s premises. The PBX provides a circuit switching facility for phone extension lines within the building, and access to the public phone network. See also “Exchange”. PROM (Programmable Read Only Memory - pronounced “prom”): A permanent memory chip that can be programmed or filled by the customer after by the manufacturer has set initial values.
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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.
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Glossary Synchronous Data Link Control (SDLC): A discipline conforming to subsets of the Advanced Data Communications Control Procedures (ADCCP) of the American National Standards Institute (ANSI) and High-level Data Link Control (HDLC) of the International Organization for Standardization, for managing synchronous, code-transparent, serial-by-bit information transfer over a link connection.
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Transmission Control Protocol (TCP): A communications protocol used in Internet and in any network that follows the US Department of Defense standards for internetwork protocol. TCP provides a reliable host-to-host protocol between hosts in packet-switched communications networks and in interconnected systems of such networks. It assumes that the Internet protocol is the underlying protocol.
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