Digicom 3910 - Manual - manualsarea.com

Page 2 - Trademarks; COPYRIGHT

COMSPHERE 3900 Series Modems A February 2002 3910-A2-GN32-41 COMSPHERE3900 Series ModemsModels 3910 and 3911Point-to-Point/Multipoint Installation and Operation Manual3910-A2-GN32-41 6th Edition (February 2002) Changes and enhancements to the product and to the information herein will be documented ...

Page 3 - Important Safety Instructions

Safety Instructions B 3910-A2-GN32-40 September 1998 Important Safety Instructions 1. Read and follow all warning notices and instructions marked on the product orincluded in the manual. 2. This product is intended to be used with a three-wire grounding type plug – a plugwhich has a grounding pin. T...

Page 4 - Notices; WARNING

COMSPHERE 3900 Series Modems C September 1998 3910-A2-GN32-40 Notices THIS EQUIPMENT HAS BEEN TESTED AND FOUND TO COMPLY WITH THE LIMITS FOR A CLASS A DIGITAL DEVICE, PURSUANT TO PART 15 OF THE FCC RULES. THESE LIMITS ARE DESIGNED TO PROVIDE REASONABLE PROTECTION AGAINST HARMFUL INTERFERENCE WHEN TH...

Page 5 - Table of Contents; Preface

i 3910-A2-GN32-40 September 1998 Table of Contents Preface Objectives and Reader Assumptions ix . . . . . . . . . . . . . . . . . . . . . . . . . How to Use this Manual ix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Related Documents x . . . . . . . . . . . . . . . . . . . . ...

Page 7 - Call Setup Branch

Table of Contents iii 3910-A2-GN32-40 September 1998 10. Call Setup Branch Overview 10-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dial 10-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Disconn...

Page 8 - Appendices

COMSPHERE 3900 Series Modems iv September 1998 3910-A2-GN32-40 Appendices A. Menu Tree A-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B. Troubleshooting B-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C. Pin Assignments C-1 . . . ....

Page 9 - List of Figures; Figure

Table of Contents v 3910-A2-GN32-40 September 1998 List of Figures Figure Page 1-1 Model 3910 1-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 Model 3911 1-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....

Page 11 - List of Tables; Table

Table of Contents vii 3910-A2-GN32-40 September 1998 List of Tables Table Page 1-1 Technical Specifications for 391x Series Modems 1Ć8 . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 Model 3910 and Model 3911 DCP LEDs 3-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2 SD...

Page 13 - Objectives and Reader Assumptions

ix 3910-A2-GN32-40 September 1998 Preface Objectives and Reader Assumptions This manual describes how to install and operate the COMSPHERE r 391x Series standalone and carrier-mounted modems. This manual assumes that you have a basic understanding of modemsand their operation. How to Use this Manual...

Page 14 - Related Documents

COMSPHERE 3900 Series Modems x September 1998 3910-A2-GN32-40 Appendix C provides EIA-232-D and VF TELCO pin assignments. Appendix D provides V.25bis dialing information. Appendix E provides an ASCII translation chart. Appendix F provides a list of all default configuration options available for the...

Page 15 - Introduction; Overview

1-1 3910-A2-GN32-40 September 1998 Introduction Overview The COMSPHERE 391x Series modems, a new generation of full-feature, high-speed modems,offer reliable asynchronous and synchronous operation over leased-line or dial networks. The 391xSeries modems’ unique software defineability allows for the ...

Page 16 - Multipoint Applications

COMSPHERE 3900 Series Modems 1-2 September 1998 3910-A2-GN32-40 Multipoint Applications In multipoint applications, leased-line circuits are used for time sharing the same front-endprocessor (FEP) port with multiple remote locations. The FEP (via the control modem) regulatestraffic on the line by co...

Page 19 - Government Requirements and Equipment Return; United States; NOTICE TO USERS OF THE PUBLIC SWITCHED TELEPHONE NETWORK

Introduction 1-5 3910-A2-GN32-40 September 1998 The Model 3911 derives ac power from the COMSPHERE 3000 Series Carrier’s backplane, whichis a common bus to all devices installed in the carrier. The user interface to any Model 3911 isthrough the shared diagnostic control panel (SDCP), an optional fea...

Page 21 - Canada; CAUTION

Introduction 1-7 3910-A2-GN32-40 September 1998 Canada NOTICE TO THE USERS OF THE CANADIAN PUBLIC SWITCHED TELEPHONE NETWORK The Canadian Department of Communications label identifies certified equipment. Thiscertification means that the equipment meets certain telecommunications network protective,...

Page 22 - Technical Specifications; COMPATIBILITY

COMSPHERE 3900 Series Modems 1-8 September 1998 3910-A2-GN32-40 Technical Specifications Table 1-1 shows the technical specifications for the 391x Series modems. Table 1-1 (1 of 3) Technical Specifications for 391x Series Modems Specifications Description APPROVALS FCC Part 15 Class A FCC Part 68 Re...

Page 25 - Modem Installation

2-1 3910-A2-GN32-41 February 2002 Modem Installation Overview This chapter provides a list of equipment supplied with the modem as well as a list of customersupplied equipment. In addition, it describes how to install and remove the 391x Series modem,and how to select a factory preset configuration ...

Page 26 - Customer-Supplied Equipment; Model 3910 Modem Installation

COMSPHERE 3900 Series Modems 2-2 September 1998 3910-A2-GN32-40 Customer-Supplied Equipment The following customer-supplied equipment is required to complete a data communications systemusing the Model 3910 modem: • A DTE with an available EIA-232-D serial port. • A standard EIA-232-D cable with a D...

Page 27 - Connecting Cables to the Model 3910 Modems; Figure 2-1. Model 3910 Rear Panel and Power Supply

Modem Installation 2-3 3910-A2-GN32-40 September 1998 Connecting Cables to the Model 3910 Modems Figure 2-1 shows how Model 3910 modems are connected to certain TELCO jack types using theappropriate cables. For pin assignments, refer to Appendix C, Pin Assignments. 8-POSITION, 8-CONDUCTOR PLUG FOR L...

Page 28 - DTE Connection; Dial Network Connection

COMSPHERE 3900 Series Modems 2-4 September 1998 3910-A2-GN32-40 DTE Connection Use the following procedures to connect the EIA-232-D cable from the modem to the DTE: 1. Make sure the modem’s rear panel power switch is OFF. 2. Connect the DB-25-P (plug) connector on the cable to the DB-25-S (socket) ...

Page 29 - Network Management System Connection

Modem Installation 2-5 3910-A2-GN32-40 September 1998 Network Management System Connection For the Model 3910, use the following procedures to connect the modem to the networkmanagement system interface: 1. Insert the sub-miniature, 4-conductor modular plug of the 3600 Hubbing Device into the jack l...

Page 30 - Selecting Factory Configuration Options; The LCD now displays Ld EditArea frm.; The LCD now displays Sav EditArea to.

COMSPHERE 3900 Series Modems 2-6 September 1998 3910-A2-GN32-40 Selecting Factory Configuration Options After the modem passes the power-up self-test, configure it for operation using one of the sixfactory preset configurations. The 391x Series modems have six factory preset templates that contain t...

Page 31 - Using AT Commands; The screen displays OK.

Modem Installation 2-7 3910-A2-GN32-40 September 1998 6. Press the key until the appropriate configuration area appears on the LCD, then press the corresponding function key to select your choice. (Saving configuration options to theActive (Saved) configuration area automatically saves them to the A...

Page 32 - NOTE

COMSPHERE 3900 Series Modems 2-8 September 1998 3910-A2-GN32-40 To change a factory template using AT commands, perform the following steps. For moreinformation on changing factory templates using AT commands, refer to Chapter 14, AT CommandSet and S-Registers. 1. Use the AT&F&W command to l...

Page 33 - Removing and Replacing Model 3910 Modems; Model 3911 Modem Installation

Modem Installation 2-9 3910-A2-GN32-40 September 1998 Removing and Replacing Model 3910 Modems To remove and replace a Model 3910 modem, perform the following steps: 1. Make sure the modem is offline, and press the modem’s rear panel power switch to the OFF position. 2. Disconnect the power cord fro...

Page 34 - Figure 2-2. Installing a Model 3911 Modem

COMSPHERE 3900 Series Modems 2-10 September 1998 3910-A2-GN32-40 Figure 2-2. Installing a Model 3911 Modem 2. At the front of the carrier, hold the modem vertically, with the latch on its faceplate in the open position, and insert it into the top and bottom card guides of one of the slotsnumbered 1–...

Page 36 - Removing and Replacing Model 3911 Modems

COMSPHERE 3900 Series Modems 2-12 September 1998 3910-A2-GN32-40 Removing and Replacing Model 3911 Modems CAUTION If the Model 3911 is removed from the carrier, always use aground strap when handling the modem. Always store theModel 3911 in an antistatic bag when it is removed from thecarrier. It is...

Page 37 - DCP Operation

3-1 3910-A2-GN32-40 September 1998 DCP Operation Overview This chapter describes how to use the diagnostic control panel (DCP) of the 391x Series modem. Italso describes how to select and use each branch of the Top-Level menu tree. Diagnostic Control Panels There are two types of diagnostic control ...

Page 38 - Model 3910 Diagnostic Control Panel

COMSPHERE 3900 Series Modems 3-2 September 1998 3910-A2-GN32-40 Model 3910 Diagnostic Control Panel The diagnostic control panel (DCP) of the Model 3910 modem (Figure 3-1) contains statusindicators, pushbutton-type keys, an LCD, and speaker grill. PWR ALRM CTS TXD LSD RXD TEST RATE 105 106 103 109 1...

Page 39 - Status Indicators

DCP Operation 3-3 3910-A2-GN32-40 September 1998 Status Indicators The 391x Series modems’ status indicators continuously provide information on the modem’soperating condition. All of the status indicators on the Model 3910 appear on the DCP(Figure 3-1), whereas the status indicators for the carrier...

Page 41 - Diagnostic Control Panel Operation

DCP Operation 3-5 3910-A2-GN32-40 September 1998 The SDCP LEDs are listed and described in Table 3-2. Table 3-2 SDCP LEDs Label Color Indicates OK green Power is ON and the modem is capable of operating. Alarm red The modem has detected a problem with its operation. For example, the modemfailed a se...

Page 42 - LCD Display; Hidden Choice Indicators; Right Scroll Indicator >; Other Indicators; Remote Mode Indicator

COMSPHERE 3900 Series Modems 3-6 September 1998 3910-A2-GN32-40 LCD Display The LCD consists of a top line and bottom line, with each displaying a maximum of 16 characters at a time. If more information is available on the LCD than what is currentlydisplayed, an indicator appears in the top right or...

Page 43 - Keypad

DCP Operation 3-7 3910-A2-GN32-40 September 1998 Keypad The DCP on the Model 3910 has seven keys while the optional SDCP of the COMSPHERE 3000 Series Carrier has eight keys. The additional key on the carrier is the Select key, used to connect the SDCP to a specific slot in the carrier. Key The key r...

Page 44 - Menu Structure; Top-Level Menu Status and Operational Messages

COMSPHERE 3900 Series Modems 3-8 September 1998 3910-A2-GN32-40 Menu Structure The menu tree is a hierarchical structure used to display functions that configure and control localand remote 391x Series modems. It is accessed via the DCP and is shown in Appendix A, MenuTree. Configure Status PList Co...

Page 46 - Top-Level Menu Status

COMSPHERE 3900 Series Modems 3-10 September 1998 3910-A2-GN32-40 Table 3-3 (2 of 3) Top-Level Menu Status Status Indicates Message Call Failure Busy Signal The answering modem is busy. DelayedNumber [ As a result of failed call attempts, this number cannot be called atthis time. Please try again lat...

Page 49 - Quick Configuration Display

DCP Operation 3-13 3910-A2-GN32-40 September 1998 The Top-Level menu’s main branches appear on the LCD in the order of Status, Configure, PList,Control, Test, SubHS, Call Setup, Talk/Data, Security, and Remote. These branches are describedin detail in Chapters 4 through 13. Quick Configuration Displ...

Page 50 - CC

COMSPHERE 3900 Series Modems 3-14 September 1998 3910-A2-GN32-40 The modem’s Quick Configuration information appears on the LCD’s bottom line. a Displays the network position of the modem. The letter C indicates this is acontrol modem, and T indicates this is a tributary modem. bbb Displays the netw...

Page 51 - Status Branch

4-1 3910-A2-GN32-40 September 1998 Status Branch Overview The Status branch of the Top-Level menu allows you to view the current status of the leased-lineor dial connection, the identity (for example, serial number and model number) of yourequipment, and the DTE interface. Configure PList Control Te...

Page 52 - alarms are present, the word Normal appears on the LCD.

COMSPHERE 3900 Series Modems 4-2 September 1998 3910-A2-GN32-40 To access Status from the Top-Level menu, select Status. F1 Leased:19.2Status Configure F2 F3 Device Health and Status (DeviceHS) DeviceHS provides a ‘‘snapshot” of current modem alarms which are active at the time theDeviceHS function ...

Page 55 - VF

Status Branch 4-5 3910-A2-GN32-40 September 1998 VF VF displays the condition of the leased or dial connection. To access VF from the Status branch, make the following selection: F1 Status: > DeviceHS VF F2 F3 Select VF. F1 Status:VF > SigQual=Excelent F2 F3 If the modem is receiving a signal,...

Page 56 - NonLnearDist; FRev

COMSPHERE 3900 Series Modems 4-6 September 1998 3910-A2-GN32-40 NonLnearDist Non-Linear Distortion displays distortion which is usually associated withpulse-code modulation (PCM) compandor noise on the phone line. Thisvalue appears for Trellis Multipoint modulation. Retrains Retrains displays the nu...

Page 57 - DTE; Backup

Status Branch 4-7 3910-A2-GN32-40 September 1998 DTE DTE displays the state and/or activity of the following interface leads: LSD, DTR, DSR, Tst,TXD, RXD, RTS, and CTS. The interface leads status is updated every 5 seconds. To access DTE from the Status branch, make the following selections: F1 Stat...

Page 60 - Record

COMSPHERE 3900 Series Modems 4-10 September 1998 3910-A2-GN32-40 Options The Options Status function displays all optional firmware features currently installed in themodem. If no firmware options are installed, None_Installed appears on the LCD. To access Options from the Status branch, make the fo...

Page 63 - DCP Configuration

5-1 3910-A2-GN32-40 September 1998 DCP Configuration Overview After installing a 391x Series modem, its software configuration options must be set using eitherthe diagnostic control panel (DCP) or the AT command set. This chapter describes how to accessand use the Configure branch of the Top-Level m...

Page 65 - Figure 5-2. AT Command Configuration Process

DCP Configuration 5-3 3910-A2-GN32-40 September 1998 Active (Saved) (ATZ0, ATZ3) Customer1 (ATZ1) Customer2 (ATZ2) Factory USE AT&W COMMAND TO SAVECHANGES TO Active (Saved),Customer1, OR Customer2 LOAD Active (Operating) USING ATZ OR AT&F COMMAND S SyncLeasedAnswer(AT&F2) S AsyncLeasedAn...

Page 66 - Configure Branch

COMSPHERE 3900 Series Modems 5-4 September 1998 3910-A2-GN32-40 Configure Branch The Configure branch of the Top-Level menu contains all of the modem’s configuration options(straps) which determine how the modem operates. These configuration options are accessed byscrolling down and across various l...

Page 67 - Editing and Saving a Configuration Option

DCP Configuration 5-5 3910-A2-GN32-40 September 1998 The Configure branch consists of the following three levels: • Ld EditArea frm. Allows the selection of the Active (Operating), Active (Saved),Customer 1, Customer 2, and Factory configuration areas. • Choose Function. Allows you to make changes (...

Page 70 - Summary

COMSPHERE 3900 Series Modems 5-8 September 1998 3910-A2-GN32-40 To save the new password to a configuration area, make the following selections: F1 RemAccssPasswrd:Nxt " 12345678 F2 F3 Press the key to scroll up (twice). F1 Choose FunctionEdit Save F2 F3 Select Save. F1 Sav EditArea to > Acti...

Page 71 - Configuration Tables; DTE Interface

DCP Configuration 5-9 3910-A2-GN32-40 September 1998 Configuration Tables The modem’s configuration options are arranged into nine groups based on functionality: DTEInterface (Table 5-1), DTE Dialer (Table 5-2), Line Dialer (Table 5-3), Dial Line (Table 5-4),Leased Line (Table 5-5), V.42/MNP/Buffer ...

Page 72 - DTE Interface Configuration Options

COMSPHERE 3900 Series Modems 5-10 September 1998 3910-A2-GN32-40 Table 5-1 (1 of 10) DTE Interface Configuration Options Async/Sync Mode: SyncNxt Sync Async Asynchronous/Synchronous Mode. Determines whether the modem operates in Asynchronous mode orSynchronous mode. If the AT command set is enabled ...

Page 81 - DTE Dialer

DCP Configuration 5-19 3910-A2-GN32-40 September 1998 Table 5-1 (10 of 10) DTE Interface Configuration Options Extend Main Ch.: DisableNxt Disable Enable Primary data can only be extended one link. Extend Main Channel. This configuration option supports extended diagnostics. Specifies whether there ...

Page 82 - DTE Dialer Configuration Options

COMSPHERE 3900 Series Modems 5-20 September 1998 3910-A2-GN32-40 Table 5-2 (1 of 5) DTE Dialer Configuration Options DTE Dialer Type: DisableNxt Disable AT V25bis_Async V25bis_Bsync V25bis_HDLC DTR=Direct1 AT&T_Exclusv Data Terminal Equipment Dialer Type. Identifies to the modem the type of dial...

Page 87 - Line Dialer; Line Dialer Configuration Options; NOTE: Pulse Mode is disabled in Denmark and in Sweden.

DCP Configuration 5-25 3910-A2-GN32-40 September 1998 Line Dialer The Line Dialer configuration options establish parameters used by the modem to answer ororiginate calls. Table 5-3 shows each Line Dialer configuration option as it appears on the LCD, with the SyncLeased factory default setting (the...

Page 90 - NOTE: The factory default value is country dependent.

COMSPHERE 3900 Series Modems 5-28 September 1998 3910-A2-GN32-40 Table 5-3 (4 of 5) Line Dialer Configuration Options No Carrier Disc: 2secNxt 2sec Disable 5sec 10sec 20sec No Carrier Disconnect. If the modem no longer receives carrier from the remote modem, it disconnects thecall. This configuratio...

Page 92 - Dial Line; Dial Line Configuration Options

COMSPHERE 3900 Series Modems 5-30 September 1998 3910-A2-GN32-40 Dial Line The Dial Line configuration options are used to configure the modem for operation over dial lines. Table 5-4 shows each Dial Line configuration option as it appears on the LCD, with the SyncLeased factory default setting (the...

Page 94 - NOTE: The V.22bis Guard Tone cannot be disabled in some countries.

COMSPHERE 3900 Series Modems 5-32 September 1998 3910-A2-GN32-40 Table 5-4 (3 of 3) Dial Line Configuration Options V22b Guard Tone: DisableNxt Disable 550Hz 1800Hz This configuration option only appears when Dial Line Rate is configured for V.22bis or V.22 datarate, or when V.32bis Automode is conf...

Page 95 - Leased Line Configuration Options

DCP Configuration 5-33 3910-A2-GN32-40 September 1998 Leased Line The Leased Line configuration options only appear when the Sync Leased factory preset templateis selected. They are used to configure the modem for operation over leased lines. Table 5-5 shows each Leased Line configuration option as ...

Page 108 - Test; Test Configuration Options

COMSPHERE 3900 Series Modems 5-46 September 1998 3910-A2-GN32-40 Test The Test configuration options determine specifics, such as the duration of a test, for the variousdiagnostic tests available to the modem. Table 5-7 shows each Test configuration option as it appears on the LCD, with the Sync Lea...

Page 110 - Misc; Miscellaneous Configuration Options

COMSPHERE 3900 Series Modems 5-48 September 1998 3910-A2-GN32-40 Misc The Miscellaneous configuration options determine specifics for various functions, includingnetwork management parameters and remote modem access. Table 5-8 shows each Misc (Miscellaneous) configuration option as it appears on the...

Page 112 - NOTE: For 6800 Series NMS applications, Disable must be selected.

COMSPHERE 3900 Series Modems 5-50 September 1998 3910-A2-GN32-40 Table 5-8 (3 of 4) Miscellaneous Configuration Options NMS_Call_Msgs: CallCnct&PrgNxt CallCnct&Prg Disable CallCnctOnly CallProgOnly NMS Call Messages. Determines if the modem status and/or call summary information is sent to t...

Page 113 - Security

DCP Configuration 5-51 3910-A2-GN32-40 September 1998 Table 5-8 (4 of 4) Miscellaneous Configuration Options Diag Connection: Modem(DC)Nxt Modem(DC) NMS(CC) Disable This configuration option is not available if the LeaseLine Rate is configured for TMp and theNetworkPosition is configured for Tributa...

Page 115 - Poll List Branch

6-1 3910-A2-GN32-40 September 1998 Poll List Branch Overview The Poll List function is not available on Point-to-Point control modems or MultipointTributary modems. The Poll List (Plist) branch of the Top-Level menu allows you to identify downstream modemsin order to support health and status pollin...

Page 116 - Display

COMSPHERE 3900 Series Modems 6-2 September 1998 3910-A2-GN32-40 To access PList from the Top-Level menu, make the following selections: F1 Leased:19.2PList Control F2 F3 Press the key until PList appears. Select PList. Within a network link, a control modem can communicate with a tributary modem by ...

Page 117 - Clear; The Clear function does not appear in Remote mode.; The Change function does not appear in Remote.

Poll List Branch 6-3 3910-A2-GN32-40 September 1998 If there are modems in the poll list when you select Display, xxx Displays the network management address of the modem in the poll list. yyyyyy Displays either Active or Skip to indicate the poll list in which the networkmanagement address is inclu...

Page 119 - Acquire; The Acquire function does not appear in Remote mode.

Poll List Branch 6-5 3910-A2-GN32-40 September 1998 Add The Add function does not appear in Remote mode or on control modems. Add allows you to add the tributary modem to a control modem’s poll list. This function shouldbe initiated from only one tributary modem at a time. To access Add from the Pli...

Page 121 - Control Branch

7-1 3910-A2-GN32-40 September 1998 Control Branch Overview The Control branch of the Top-Level menu allows you to manage hardware and softwarefunctions, such as speaker volume, reset, busy out, and firmware download. Control “Status” Status Configure PList Test SubHS Call_Setup Tlk/Data Security Rem...

Page 122 - Off

COMSPHERE 3900 Series Modems 7-2 September 1998 3910-A2-GN32-40 To access Control from the Top-Level menu, make the following selections: F1 Leased:19.2Control Test F2 F3 Press the key until Control appears. Select Control. Speaker Speaker allows you to make temporary adjustments to the modem’s spea...

Page 123 - Reset; Data Stream; The Data Stream function is not available in Async mode.

Control Branch 7-3 3910-A2-GN32-40 September 1998 Reset Reset causes the modem to stop operation and perform a complete program restart. The modembegins the power-up test sequence that ends with the Top-Level menu displayed on the LCD.Configuration options stored in an Active (Saved) configuration a...

Page 124 - EIA LEDs

COMSPHERE 3900 Series Modems 7-4 September 1998 3910-A2-GN32-40 If you want to disable the modem’s data stream, press the F2 key. When the message CommandComplete appears, press the key to clear the message. F1 Data StreamPort1 Enable F2 F3 Press the F2 key again to enable the modem’s data stream. T...

Page 125 - Make Busy/Remove Make Busy

Control Branch 7-5 3910-A2-GN32-40 September 1998 After selecting the desired interface, the message Command Complete appears on the bottomline of the LCD and the selected interface appears in the xxxxx field. To exit this function and remain in the Control branch, press the key. To exit and return ...

Page 126 - RemoveMakeBusy appears.; Service Line/Disconnect Service Line

COMSPHERE 3900 Series Modems 7-6 September 1998 3910-A2-GN32-40 To remove the modem from Make Busy mode, press the key once and the key until RemoveMakeBusy appears. F1 Control:RemoveMakeBusy F2 F3 Press any function key to select RemoveMakeBusy. The message Command Complete appearson the LCD. Servi...

Page 127 - Download Software; Selecting Clone Remote

Control Branch 7-7 3910-A2-GN32-40 September 1998 Download Software The Download Software function sets parameters within the modem when transferring firmwareto one or more modems or when receiving firmware upgrades from a locally attached PC-basedcontroller. The latter is only performed by customer...

Page 128 - Clone Remote in Point-to-Point Configurations

COMSPHERE 3900 Series Modems 7-8 September 1998 3910-A2-GN32-40 Clone Remote in Point-to-Point Configurations Before using Clone Remote in point-to-point configurations, perform the following: • Make sure the 391x Series modems have an established leased-line connection usingeither V.33, V.32terbo, ...

Page 129 - Viewing DC Broadcast Clone Results; Clone Remote in Multipoint Configurations

Control Branch 7-9 3910-A2-GN32-40 September 1998 From the Choose DLL Type screen, press the key until DC_Broadcast appears. Press F1 or F2 to transfer an exact copy of the tributary modem’s firmware to the DC-connected controlmodem(s) using the Active Poll list. Proceed to Implementing a Clone Remo...

Page 130 - Cloning a Single TMp Remote

COMSPHERE 3900 Series Modems 7-10 September 1998 3910-A2-GN32-40 • For Single download configurations, know the remote access password and the networkmanagement address of the remote tributary modem that will receive the download. Referto the Misc section in Chapter 4 for a description of the remote...

Page 131 - Cloning a Multiple TMp Remote; Viewing Multiple TMp Clone Results

Control Branch 7-11 3910-A2-GN32-40 September 1998 After completing these actions, proceed to Implementing a Clone Remote Operation on page 7-12. Cloning a Multiple TMp Remote F1 Choose DLL Type >Single Multiple F2 F3 Press the F3 key to select Multiple Clone Remote. After completing this action,...

Page 132 - Implementing a Clone Remote Operation; Incompat Modulat

COMSPHERE 3900 Series Modems 7-12 September 1998 3910-A2-GN32-40 Implementing a Clone Remote Operation WARNING The modem begins a transfer of its own program to the remotemodem. This process takes the communication linkout-of-service for several minutes depending on the data rateof the link. If the ...

Page 133 - Access Disabled; Password Invalid; VF Thresholds Update

Control Branch 7-13 3910-A2-GN32-40 September 1998 Access Disabled The remote modem’s Access from Remote configuration is disabled. Password Invalid The local and remote modems’ passwords do not match. Correct theproblem and attempt another download from the local modem. If thisfails, contact your s...

Page 136 - Valid Ranges for VF Thresholds

COMSPHERE 3900 Series Modems 7-16 September 1998 3910-A2-GN32-40 To correct the invalid VF threshold, press the key to return to the VF Threshold Edit/Save/Reset screen. F1 VF ThresholdsEdit Save Reset F2 F3 Select Reset to restore the original default values into memory. Repeat the Edit and Save pr...

Page 137 - Test Branch

8-1 3910-A2-GN32-40 September 1998 Test Branch Overview The Test branch of the Top-Level menu allows you to initiate various modem tests. Use thesetests if you are having data communication problems, such as periodic character loss, randomerrors, or constant format errors. By the process of eliminat...

Page 138 - Abort

COMSPHERE 3900 Series Modems 8-2 September 1998 3910-A2-GN32-40 To access the Test branch from the Top-Level menu, make the following selections: F1 Leased:19.2Control Test F2 F3 Press the key until Test appears. Select Test. Abort Abort ends any test that is in progress and brings the modem back to...

Page 139 - Self

Test Branch 8-3 3910-A2-GN32-40 September 1998 Self Self performs an internal self-test of the modem, which takes less than a minute to complete.The modem must be offline; otherwise, Invalid Command appears. WARNING When this test is run in Remote mode, it will cause the Remotemode session to be los...

Page 140 - Loc Analog Loop

COMSPHERE 3900 Series Modems 8-4 September 1998 3910-A2-GN32-40 Loc Analog Loop Loc Analog Loop performs a local analog loopback (ITU-T- V.54 Loop 3), Figure 8-1, thatverifies modem operation as well as the connection between the DTE and modem. The modemmust be offline and in Synchronous or Asynchro...

Page 141 - Rem Digital Loop

Test Branch 8-5 3910-A2-GN32-40 September 1998 The message Started appears on the LCD, and the Test LED lights for the duration of the test. IfInvalid Command appears on the LCD, another test is in progress. Select Abort to clear thecurrent test and try again. If the Test Timeout configuration optio...

Page 142 - Loc Digital Loop

COMSPHERE 3900 Series Modems 8-6 September 1998 3910-A2-GN32-40 Press the key until Rem_Digital_Loop appears. Press any function key to start this test. F1 Test:Remote LoopStarted F2 F3 The message Started appears on the LCD, and the Test LED lights for the duration of the test. IfInvalid Command ap...

Page 143 - Pattern; Figure 8-4. Pattern Test and Local Analog Loopback Test

Test Branch 8-7 3910-A2-GN32-40 September 1998 F1 Test:Loc_Digital_Loop F2 F3 Press the key until Loc_Digital_Loop appears. Press any function key to start this test. F1 Test:Digitl LoopStarted F2 F3 The message Started appears on the LCD and the Test LED lights. If Invalid Commandappears on the LCD...

Page 144 - Figure 8-5. Pattern Test and Digital Loopback Test

COMSPHERE 3900 Series Modems 8-8 September 1998 3910-A2-GN32-40 Figure 8-5. Pattern Test and Digital Loopback Test Figure 8-6. End-to-End Pattern Test To access Pattern from the Test branch, make the following selections: F1 Test: < Pattern F2 F3 Press the key until Pattern appears. Select Patter...

Page 145 - key to display BlksRcvd=xxxxxxx, number of blocks of data received.

Test Branch 8-9 3910-A2-GN32-40 September 1998 BlksErrd=xxxxxxx displays the number of blocks of data found in error (block size is 1000 bitsper block). BlksRcvd=xxxxxxx displays the total number of blocks of data received. Themessage NoSync appears as a value for BlksErrd while the modem’s receiver...

Page 149 - Call Setup Branch; The Call Setup function is not available in TMp Control mode.

10-1 3910-A2-GN32-40 September 1998 Call Setup Branch Overview The Call Setup function is not available in TMp Control mode. For dial backup applications, the Call Setup branch of the Top-Level menu allows you to dial,disconnect, and answer telephone calls. For leased backup applications, the Call S...

Page 150 - Dial

COMSPHERE 3900 Series Modems 10-2 September 1998 3910-A2-GN32-40 To access the Call Setup branch from the Top-Level menu, make the following selections: F1 Leased:19.2Call_Setup F2 F3 Press the key until Call_Setup appears. Select Call_Setup. Dial For dial backup applications, Dial allows you to dia...

Page 151 - Disconnect

Call Setup Branch 10-3 3910-A2-GN32-40 September 1998 Once the directory location you want appears on the LCD, press the F2 or F3 key to dial thenumber. F1 DialDirectory:01Off Hook F2 F3 The Call Setup status Off Hook appears during the connection process. If the connection issuccessful, one of the ...

Page 152 - Answer

COMSPHERE 3900 Series Modems 10-4 September 1998 3910-A2-GN32-40 Answer For dial backup applications, Answer allows the modem to go off-hook, generate an answer tone,and begin the handshaking process with the calling modem. Use the Answer function when theAuto-Answer Ring Count configuration option ...

Page 153 - Dial Standby/Return to Dial

Call Setup Branch 10-5 3910-A2-GN32-40 September 1998 Dial Standby/Return to Dial When the modem is operating in Dial Backup mode (DialBckUp), Dial Standby and Return toDial allow the modem to switch back and forth between primary leased-line and primaryleased-line backup operation while still maint...

Page 154 - Change Directory

COMSPHERE 3900 Series Modems 10-6 September 1998 3910-A2-GN32-40 To access Dial Standby or Return to Dial from the Call Setup branch, make the followingselections: F1 Call Setup:Dial Standby F2 F3 Press the key until Dial Standby or Return_to_Dial appears. Select the appropriate function. F1 Dial St...

Page 156 - Valid Dial Command Modifiers

COMSPHERE 3900 Series Modems 10-8 September 1998 3910-A2-GN32-40 To save the number just entered, scroll to the next directory location by selecting Nxt. Thenumber is now stored in nonvolatile memory. Table 10-1 describes what can be entered in directory locations. Table 10-1 Valid Dial Command Modi...

Page 157 - Directory Status (Does Not Appear in North America); No Number

Call Setup Branch 10-9 3910-A2-GN32-40 September 1998 Directory Status (Does Not Appear in North America) Directory Status displays the status of each directory location. To access Directory Status from the Call Setup branch, make the following selections: F1 Call Setup: < Directory_Status F2 F3 ...

Page 159 - The Talk/Data function is not available in TMp Control mode.

11-1 3910-A2-GN32-40 September 1998 Talk/Data Branch Overview The Talk/Data function is not available in TMp Control mode. The Talk/Data branch of the Top-Level menu allows you to switch the modem between Talkmode and Data mode when manually dialing using either the DCP or an externally attachedtele...

Page 163 - Dial Access Security

12-1 3910-A2-GN32-40 September 1998 Dial Access Security Overview NOTE This chapter supports the operation of dial access security for theCOMSPHERE 391x Series modems. This chapter is self supportingand can be removed to prevent unwanted knowledge of dial accesssecurity operation. Although the secur...

Page 164 - Originate Access Security; Answer Access Security

COMSPHERE 3900 Series Modems 12-2 September 1998 3910-A2-GN32-40 Originate Access Security Originate Access lets you control who can originate a call from a local modem via the ATcommand set. This is useful in LAN and modem pooling applications. With Originate Accesssecurity, a local user’s password...

Page 166 - Combination of VF-Side and DTE-Side Passwords; Security Branch

COMSPHERE 3900 Series Modems 12-4 September 1998 3910-A2-GN32-40 Combination of VF-Side and DTE-Side Passwords The previously described methods of password entry can be combined to provide two layers ofsecurity. In this case, the modems negotiate VF-side password entry prior to training. If successf...

Page 167 - Set Access Ctrl

Dial Access Security 12-5 3910-A2-GN32-40 September 1998 Set Access Ctrl Set Access Control allows you to configure critical parameters contained within the securitydatabase table that control dial access security. These parameters are protected by anAdministrative Password, which is an 8-digit deci...

Page 168 - EditPasswdTable; Select Index

COMSPHERE 3900 Series Modems 12-6 September 1998 3910-A2-GN32-40 Press the key to scroll the Set Answer Security, Set Originate Security, and Set Administrative Password groups into view. If an incorrect administrative password is entered, then the message PassWrd Invalid appears aswell as the last ...

Page 169 - Edit Password Table Group Options

Dial Access Security 12-7 3910-A2-GN32-40 September 1998 Select Index appears. Press the F2 ( " ) key to increment index values. Press the key to move the cursor to the next position. Continue this sequence until the desired index appears, and then select Ent. If an index outside of the range is...

Page 171 - Set Answer Sec; Set Answer Security Group Options

Dial Access Security 12-9 3910-A2-GN32-40 September 1998 Set Answer Sec Set Answer Security determines if dial access security is enabled or disabled. This method ofinbound security is configured in the answering modem. Although this also appears under theSecurity Configuration Option group, it can ...

Page 172 - Set Orig Sec; Set Originate Security Group Options

COMSPHERE 3900 Series Modems 12-10 September 1998 3910-A2-GN32-40 Set Orig Sec Set Originate Security controls whether or not the modem can originate a call using AT commandswhen the dial access security feature is installed. This method of outbound security only applies tomodems originating a call....

Page 173 - Set Admin PsWd

Dial Access Security 12-11 3910-A2-GN32-40 September 1998 Set Admin PsWd Set Administrative Password is used to change the Administrative Password value. TheAdministrative Password is an 8-digit decimal number that allows authorized users to enter theAccess Security Control function. NOTE If this va...

Page 174 - Reset Security

COMSPHERE 3900 Series Modems 12-12 September 1998 3910-A2-GN32-40 Reset Security Reset Security is the second major function within the Security branch of the Top-Level menu. Iterases all contents of the security database table and resets all index locations to Cleared. Twoselections appear under Re...

Page 175 - Security Configuration Options

Dial Access Security 12-13 3910-A2-GN32-40 September 1998 Security Configuration Options The Security Configuration Options group allows you to view and set dial access securityparameters. This group is located in the Configuration branch of the Top-Level menu. Table 12-4 shows each Security configu...

Page 178 - Security Password Entry Techniques

COMSPHERE 3900 Series Modems 12-16 September 1998 3910-A2-GN32-40 Security Password Entry Techniques The previous sections described how to set up and configure your network for dial access security.Once configured and enabled, you must now supply a password to originate or answer a call. The follow...

Page 179 - Originate Access Password

Dial Access Security 12-17 3910-A2-GN32-40 September 1998 Originate Access Password An Originate Access password is entered by a local user to gain access to a local 391x Seriesmodem. This password is embedded in the AT dial command and cannot be entered from thediagnostic control panel (DCP). The f...

Page 180 - Database Table Examples

COMSPHERE 3900 Series Modems 12-18 September 1998 3910-A2-GN32-40 Database Table Examples The following examples illustrate possible database tables in which the password type isconfigured for VF Entry, DTE Entry or a combination of VF, DTE, and VF plus DTE Entry. Thesetables are shown for illustrat...

Page 185 - Remote Branch

13-1 3910-A2-GN32-40 September 1998 Remote Branch Overview The Remote branch of the Top-Level menu allows you to control the remote modem’s DCPusing the local modem’s DCP. This function allows you to change configuration options andcontrol test functions in a remote modem. Any changes made to config...

Page 189 - Diagnostic Control Panel Access

Remote Branch 13-5 3910-A2-GN32-40 September 1998 • If a connection is established but the wrong password is stored, the status messagePassword Invalid appears on the LCD. This configuration option must be enabled by theremote user. (Refer to the Remote Access Password configuration option in Table ...

Page 191 - AT Command Set and S-Registers; Switching Between Data Mode and Online Command Mode; Escape Sequence and Escape Guard Time

14-1 3910-A2-GN32-40 September 1998 AT Command Set and S-Registers Overview The AT command set provides an alternative method to the modem’s DCP for entering commandsthat control the operation and configuration of the 391x Series modems. This chapter discussesguidelines necessary to operate AT comma...

Page 192 - Command Guidelines

COMSPHERE 3900 Series Modems 14-2 September 1998 3910-A2-GN32-40 Use the O command to return to Data mode from online Command mode. Enter the followingcommand: TYPE: ATO PRESS: Enter Command Guidelines Review the following guidelines before using any AT Commands. • The escape sequence ( + + + ) is u...

Page 193 - Result Codes

AT Command Set and S-Registers 14-3 3910-A2-GN32-40 September 1998 Result Codes Table 14-1 lists all valid result codes for the 391x Series modem. Table 14-1 (1 of 2) Result Codes Numbers (1) Numbers (2) Word Description 0 0 OK Command executed 1 1 CONNECT Modem connected to line 2 2 RING Modem rece...

Page 194 - AT Command List; AT Command Format

COMSPHERE 3900 Series Modems 14-4 September 1998 3910-A2-GN32-40 Table 14-1 (2 of 2) Result Codes Numbers (1) Description Word Numbers (2) 28 28 CONNECT 38400** Connection at 38,400 bps 29 14 CONNECT 19200/ EC** Connection at 19,200 bps with error control 30 30 CONNECT 57600** Connection at 57,600 b...

Page 205 - 91x Series S-Registers

AT Command Set and S-Registers 14-15 3910-A2-GN32-40 September 1998 S-Register Format S-Registers can be displayed and/or modified when the modem is in Command mode. To displaythe value of an S-Register, issue the following command: TYPE: ATSn? Where: n is the register number. PRESS: Enter To modify...

Page 219 - Menu Tree

A-1 3910-A2-GN32-40 September 1998 Menu Tree Overview Pages A-2 and A-3 provide a menu tree for the 391x Series modems. A

Page 223 - Troubleshooting; Modem Health

B-1 3910-A2-GN32-40 September 1998 Troubleshooting Overview This appendix points out basic problems that can occur when operating a 391x Series modem.Use Tables B-1 through B-6 to check out these problems. If you are having data communicationdifficulties, such as periodic character loss, random erro...

Page 225 - Modem — DTE Connection

Troubleshooting B-3 3910-A2-GN32-40 September 1998 Table B-4 Modem — DTE Connection Symptom Action The modem does not accept orecho back AT commands. Verify that the cable between the Async port of the DTE and themodem is a standard RS-232 cable. (Null modem cables, also knownas crossover cables, do...

Page 226 - Modem — VF Connection

COMSPHERE 3900 Series Modems B-4 September 1998 3910-A2-GN32-40 Table B-5 (1 of 2) Modem — VF Connection Symptom Action The modem does not receive adial tone. Attach a telephone directly to the telephone line to verify that a dialtone exists. Make sure the VF line is connected to the modem’s rear ja...

Page 228 - Online Operation

COMSPHERE 3900 Series Modems B-6 September 1998 3910-A2-GN32-40 Table B-6 Online Operation Symptom Action The data is scrambled. Verify that the character format (data bits, parity, and stop bits) is set tothe same value in both modems. Data is missing during a transfer. Verify that you are using th...

Page 229 - Pin Assignments

C-1 3910-A2-GN32-40 September 1998 Pin Assignments Overview This appendix lists EIA-232-D and VF TELCO pin assignments and provides information aboutauxiliary cables which are not supplied. C

Page 231 - VF Connector Pin Assignments

Pin Assignments C-3 3910-A2-GN32-40 September 1998 VF Connector Pin Assignments Table C-2 lists the connector pin assignments for Model 3910 modular jacks as well as the pinassignments for the TELCO jacks. (See Figure C-1.) Table C-2 VF Connector Pin Assignments Type of Telco Jack Pin Leased Dial RJ...

Page 232 - Auxiliary Cables Not Supplied; Figure C-2. Wiring Diagram — Y Cable for External Telephone

COMSPHERE 3900 Series Modems C-4 September 1998 3910-A2-GN32-40 Auxiliary Cables Not Supplied To add an external telephone to your modem, use an external Y cable to connect the phone lineto both the modem and the telephone (Figure C-2). Figure C-2. Wiring Diagram — Y Cable for External Telephone

Page 235 - and Responses; Call Request Commands

D-1 3910-A2-GN32-40 September 1998 ITU-T V.25bis Dialing Commands and Responses Overview This appendix describes V.25bis dialing commands and responses. ITU-T V.25bis is aninternational dialing protocol that permits direct and stored number dialing using DTEs in eitherAsynchronous, Bisynchronous, or...

Page 236 - Call Request with Stored Memory Address Provided (CRS); Call Response

COMSPHERE 3900 Series Modems D-2 September 1998 3910-A2-GN32-40 Call Request with Stored Memory Address Provided (CRS) The CRS command dials the telephone number stored in the request directory location. CRS issimilar to the ATDS command. The CRS command format is: CRSx Where: x is directory locatio...

Page 237 - Delayed Call Indicator; Call Answer Commands

ITU-T V.25bis Dialing Commands and Responses D-3 3910-A2-GN32-40 September 1998 Delayed Call Indicator The DLC response is issued to the DTE if the modem is not currently allowed to call the number.DLC is similar to the AT result code DELAYED. The DLC response format is: DLCn Where: n is the delay (...

Page 239 - Command Response

ITU-T V.25bis Dialing Commands and Responses D-5 3910-A2-GN32-40 September 1998 List Delayed Numbers Response (LSD) LSD is a response to an LSD command issued by DTE. LSDx;n;d Where: x is a sequence number (not a directory location). n is the telephone number. d is the delay in minutes List Forbidde...

Page 243 - ASCII Character Table

E-1 3910-A2-GN32-40 September 1998 ASCII Character Table Overview Table E-1 in this appendix provides the ASCII character table. Table E-1 (1 of 4) ASCII Characters Hexadecimal ASCII Value Decimal ASCII Value Control Character Key 00 000 NUL CTRL-@ 01 001 SCH CTRL-A 02 002 STX CTRL-B 03 003 EXT CTRL...

Page 247 - Default Configuration Options

F-1 3910-A2-GN32-40 September 1998 Default Configuration Options Overview Table F-1 lists all default configuration options for the factory preset configurations. An N/Aindicates that the value for this configuration option does not appear on the LCD when that factorydefault configuration is selecte...

Page 248 - Factory Default Configuration Options

COMSPHERE 3900 Series Modems F-2 September 1998 3910-A2-GN32-40 Table F-1 (1 of 7) Factory Default Configuration Options Configuration Option Sync Leased Default Settings Async Leased Default Settings TMp Default Settings Async Dial Default Settings UNIX Dial Default Settings Sync Dial Default Setti...

Page 255 - Sample Configurations

G-1 3910-A2-GN32-40 September 1998 Sample Configurations Overview This appendix provides diagrams of sample configurations for the 391x Series modems. Followingeach diagram, the appropriate configuration options and cables are listed. G

Page 256 - Configuration Options; Cable 1

COMSPHERE 3900 Series Modems G-2 September 1998 3910-A2-GN32-40 Point-to-Point Figure G-1 shows a sample configuration for point-to-point applications. 3910 A Cable 1 Cable 1 Cable 2 Cable 2 Leased 19200(V32t) 19200(V32t) TX TX DTE (Sync) DTE (Sync) 3910 B Figure G-1. Sample Configuration — Point-to...

Page 257 - Multipoint; Figure G-2. Sample Configuration — Multipoint

Sample Configurations G-3 3910-A2-GN32-40 September 1998 Multipoint Figure G-2 shows a sample configuration for multipoint applications. TMp control modems can accept mixed inbound rates from tributary modems. For example, oneinbound link may be configured for 14.4 kbps while another link experienci...

Page 258 - Point-to-Point with Automatic Dial Backup; Auto Dial Back; Cables

COMSPHERE 3900 Series Modems G-4 September 1998 3910-A2-GN32-40 Point-to-Point with Automatic Dial Backup Figure G-3 shows a sample configuration for point-to-point applications with automatic dialbackup. Cable 1 Cable 1 Cable 2 Cable 2 Leased 19200(V32t) 19200(V32t) TX TX Cable 3 Cable 3 Dial DTE (...

Page 260 - Carrier with Network Management; Figure G-5. Sample Configuration — Carrier with Network Management

COMSPHERE 3900 Series Modems G-6 September 1998 3910-A2-GN32-40 Carrier with Network Management Figure G-5 shows a sample configuration for COMSPHERE 3000 Series Carrier applications withnetwork management. NMS (6700 or 6800) Adapter (002-0025-0031) CC IN SDU Circuit Card COMSPHERE3000 Series Carrie...

Page 261 - Extended Multipoint; Figure G-6. Sample Configuration — Extended Multipoint

Sample Configurations G-7 3910-A2-GN32-40 September 1998 Extended Multipoint Figure G-6 shows a sample configuration for extended multipoint applications. Cable 1 Cable 2 Cable 2 Leased 19200(V32t) 19200(V32t) TX TX Cable 1 Cable 1 Cable 1 4800 4800 4800 4800 Cable 1 Cable 1 Cable 1 Cable 5 4800 480...

Page 263 - Extended Diagnostics; Network position

Sample Configurations G-9 3910-A2-GN32-40 September 1998 Extended Diagnostics Figure G-7 shows a sample configuration for extended diagnostics. Figure G-7. Sample Configuration  Extended Diagnostics Configuration Options 3910 A Use Sync Leased (Answer) default configuration options with the followi...

Page 265 - Equipment List; Equipment

H-1 3910-A2-GN32-40 September 1998 Equipment List Equipment Feature/ Part Number Model 3910 3910-A1-40X Model 3911 3911-B1-00X 6-position, 4-wire modular cord, 7-foot length 125-0067-0031 8-position, 8-wire modular cord, 14-foot length 125-0053-1431 Universal Power Supply 327-0074-0131 3600 Hubbing ...

Page 267 - Glossary

Glossary-1 3910-A2-GN32-40 September 1998 Glossary A configuration area containing configuration options currently in use by the modem. When apower cycle occurs, a reset is performed, or a save is issued using the DCP, this area is updatedwith the contents of Active (Saved). A nonvolatile configurat...

Page 275 - Index

Index-1 3910-A2-GN32-40 September 1998 Index A Abort (test), 8-2–8-10ac power requirements, 1-9Access from Remote, 5-49Active (Operating) configurations, 5-1Active (Saved) configurations, 5-1address, network management, 5-50, 6-2alarms, DTE and VF, 5-19analog loopback test, 8-4–8-10answer access sec...

Digicom 3910 - Manual

Table of Contents:

Summary

Other Digicom Models