Multi-Tech Systems MT4X56USB manual Glossary

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Glossary

Rate Enforcement: The concept in frame relay where frames sent faster than the CIR are to be carried only if the bandwidth is available, otherwise they are to be discarded. (The frame relay network assumes that anything exceeding the CIR is of low priority.) Rate enforcement makes sure that the network will not get so congested that it isn’t able to meet the agreed on CIR.

Recognized Private Operating Agency (RPOA): A corporation, private or government-controlled, that provides telecommunications services. RPOAs, such as AT&T, participate as non-voting members in the CCITT.

Red Alarm: A T1 error condition generated when a local failure (e.g., loss of synchronization) exists for 2.5 seconds, causing a Carrier Group Alarm (CGA). See also “Blue Alarm” and “Yellow Alarm”.

Request for Comment (RFC): A set of papers in which Internet standards (published and proposed), along with generally- accepted ideas, proposals, research results, etc. are published.

RJ-11:An industry standard interface used for connecting a telephone to a modular wall outlet; comes in 4-and 6-wire packages.

RJ-45:An 8-wire modular connector for voice and data circuits.

Root Hub: A Universal Serial Bus hub directly attached to the host controller. This hub is attached to the host; tier 0.

Root Port: The upstream port on a hub.

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.

Routing Information Protocol (RIP): A distance vector-based protocol that provides a measure of distance, or hops, from a transmitting workstation to a receiving workstation.

RS-232C:An EIA standard for a serial interface between computers and peripheral devices (modem, mouse, etc.). It uses a 25-pin DB-25, or a 9-pin DB-9 connector. The RS-232 standard defines the purposes, electrical characteristics and timing of the signals for each of the 25 lines.

RS-422:The EIA standard for a balanced interface with no accompanying physical connector. RS-422 products can use screw terminals, DB9, various DB25, and DB37 connectors.

RS-530:The EIA standard for the mechanical/electrical interface between DCEs and DTEs transmitting synchronous or asynchronous serial binary data. RS-530 provides for high data rates with the same connector used for RS-232; however, it is incompatible with RS-232.

S

Serial Port: The connector on a PC used to attach serial devices (those that need to receive data one bit after another), such as a mouse, a printer or a modem. This consists of a 9- or 25-pin connector that sends data in sequence (bit by bit). Serial ports are referred to as “COMx” ports, where x is 1 to 4 (i.e., COM1 through COM4). A serial port contains a conversion chip called a “UART” which translates between internal parallel and external serial formats.

Service: The requirements offered by an RPOA to its customers to satisfy specific telecommunications needs.

Severely Errored Seconds (SES): Refers to a typical T1 error event where an error burst occurs (a short term, high bit-

error rate that is self-clearing). Per the ITU-T (CCITT) G.821: any second in which the BER is less than 1x10 -3 .

Signaling: The process of establishing, maintaining, accounting for, and terminating a connection between two endpoints (e.g., the user premises and the telco CO). Central office signals to the user premises can include ringing, dial tone, speech signals, etc. Signals from the user’s telephone can include off-hook, dialing, speech to far-end party, and on-hook signals. In-band signaling techniques include pulse and tone dialing. With common channel signaling, information is carried out-of- band.

Simple Network Management Protocol (SNMP): TCP/IP protocol that allows network management.

Simultaneous Voice Data (SVD): A technology for letting a user send data via a modem, and use a handset to talk to another user at the same time over the same connection. The alternative, making a second call, can be expensive or even impossible. The uses for SVD are telecommuting, videoconferencing, distant learning, tech support, etc.

Stop Bit: One of the variables used for timing in asynchronous data transmission. Depending on the devices, each character may be trailed by 1, 1.5, or 2 stop bits.

Switched Virtual Circuit (SVC): A data transmission type where the connection is maintained only until the call is cleared.

Switched Line: In communications, a physical channel established by dynamically connecting one or more discrete segments. This connection lasts for the duration of the call, after which each segment can be used as part of a different channel. Contrast with leased line.

Switched Network: A network in which a temporary connection is established from one point via one or more segments.

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Contents User Guide MultiModemUSB Model MT4X56USBRecord of Revisions User GuidePatents TrademarksContents Glossary of Terms Index Introduction and Description MultiModemUSB User Guide FeaturesIntroduction Installation Technical SpecificationsPreview of this Guide Introduction and DescriptionRelated Documentation Modem Ports Ports 1, 2, 3, Front PanelHub SystemUSB Type a Upstream Connector RJ-ll Modem ConnectorUSB Type B Downstream Connector Power ConnectorInstallation Unpacking Safety Warning TelecomCabling your MT4X56USB InstallationMT4X56USB Software Loading and Configuration MT4X56USB Drivers for Windows System USB SupportLoading your Driver Software Software Loading and Configuration Uninstalling MultiModemUSB in Windows MT4X56USB Drivers for Windows Uninstalling MultiModemUSB in Windows MT4X56USB Drivers for Windows NT MultiModemUSB Drivers Install dialog box displays Click NextAdd/Remove Uninstalling MultiModemUSB in Windows NTSelect Add/Remove Programs MT4X56USB Drivers for Windows Click Finish Software Loading and Configuration Select Add/Remove Hardware Click Start Settings Control Panel Modems Installing Your V.90 ModemsRead Carefully Software Loading and Configuration MT4X56USB Click Start Settings Control Panel Phone and Modems option Installing Your V.90 Modems WindowsMT4X56USB Software Loading and Configuration Windows 95/98 Configuration Utility MT4X56USB Windows NT 4.0/2000 Configuration Utility MT4X56USB MT4X56USB AT Commands, S-Registers and Result Codes Command Enter Key AT Command SummaryRepeat Last Command AnswerAT Commands, S-Registers and Result Codes Result Codes Enable/Disable Return Online to Data ModeInformation Request Modulation HandshakeLoad Factory Settings Modem ResetTone Dialing Result Code FormatAsynchronous Communications Mode Communications ModeTest Commands Display Current SettingsSelect Stored Configuration for Hard Reset Store Current ConfigurationCommand &Zy=x Store Dialing Command \An Select Maximum MNP Block Size\Tn Inactivity Timer \Nn Error Correction Mode Selection\Kn Break Control \Qn Flow Control SelectionCommand %En Fallback and Fall Forward Control Command %DCn AT Command ControlEnter Setup Password Command #S=x Store Setup PasswordCommand %%%ATCRRemote Configuration Escape Sequence Command +++ATCR Escape SequenceRegisters Register Unit Range Default DescriptionUpstream data rates S38Terse Verbose Description Result CodesFor more information on scripting, click the Help button Remote Configuration Changing the Setup Password Remote Configuration ProcedureSetup Changing the Remote Escape Character Remote Configuration CommandsRemote Configuration and Management MT4X56USB Troubleshooting Modem Dials But Cannot Connect None of the Indicators LightModem Does Not Respond to Commands Modem Disconnects While Online TroubleshootingLoopback Tests Modem Cannot Connect When AnsweringModem Doesn’t Work with Caller ID Fax and Data Software Can’t Run at the Same TimeLocal Analog Loopback Test V.54 Loop Test procedureRemote digital loopback test Remote Digital Loopback Test V.54 LoopLocal digital loopback test Local Digital Loopback Test V.54 LoopDetermining Why USB Support Is Not Present Windows 95/98 TroubleshootingInstalling Microsoft USB Support Double-click the Universal Serial Bus Controller iconUpgrade Procedure Identify the MT4X56USB Firmware Upgrade OverviewIdentify the Current Firmware Version Multi-Tech Web SiteExtract the Upgrade Files Download the Upgrade FileUpgrade Procedure Clear Your Stored ParamentersRestore Your Parameters Upgrade the Modem’s FirmwareService, Warranty and Tech Support Software User License Agreement On-line Warranty Registration Limited WarrantyService, Warranty and Tech Support Tech SupportContacting Tech Support via E-mail ServiceAppendices Class B Statement Appendix a Regulatory InformationFCC Part Industry CanadaAppendices FCC Part 68 TelecomCanadian Limitations Notice FAX Branding StatementCommission Decision CTR21 EMC, Safety and Terminal Directive ComplianceNew Zealand Telecom Warning Notice International Modem RestrictionsIntroduction TroubleshootingAppendix B V.90 Support Glossary of Terms MT4X56USB Glossary MT4X56USB Glossary MT4X56USB Glossary MT4X56USB Glossary MT4X56USB Glossary MT4X56USB Glossary MT4X56USB Index IndexConfiguration MT4X56USB Software user license agreement Speed