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3920-A2-GK41-60 February 2002

COMSPHERE 392xPlus Modems

Models 3920Plus and 3921Plus

Installation Instructions

Document Number 3920-A2-GK41-60

February 2002

Overview

The COMSPHERE Model 392xPlus modems are full-feature, high-speed leased modems, providing reliable

asynchronous and synchronous operation over leased or dial-line networks with data rates as high as 33,600 bps.

Through downloading capability, any Model 392xPlus modem is upgradable to the latest firmware, requiring no

new hardware investment or on-site personnel, with little or no downtime. For more information on downloading

capability, refer to the Automatic Firmware Download section in Chapter 7, Control Branch, of the COMSPHERE

392xPlus Modems, Models 3920Plus and 3921Plus, Technical Reference Manual, Document No. 3920-A2-GH30.

Model 392xPlus modems support a wide range of modulation schemes and offer control using either AT

commands, the diagnostic control panel (DCP) or the optional COMSPHERE 6700 and 6800 Series Network

Management Systems (NMS). The NMS performs extensive monitoring, testing, reporting, and restoral functions

to assist in managing your network.

Model 392xPlus modems are compatible with a number of dialing methods and protocols, such as asynchronous

AT commands, ITU-T V.25bis dialing, and the DCP. The DCP allows you to use the Model 392xPlus modem in a

variety of applications and environments while also providing control over modem configuration, dialing, and

diagnostics. The Model 392xPlus modems come with preset factory configurations that are the most often used

modem settings.

This document provides the following information:

• A description of the COMSPHERE 392xPlus models

• A list of equipment supplied with the modem

• A list of customer-supplied equipment

• Installation instructions

• A 392xPlus Menu tree

• Important safety instructions

• Regulatory notices

• Government requirements and equipment return information

This document is intended to be used in conjunction with the COMSPHERE 392xPlus Modems, Models 3920Plus

and 3921Plus, Technical Reference Manual, Document No. 3920-A2-GH30. This manual is available on the

World Wide Web at www.paradyne.com. Select Library → Technical Manuals → Business Class Analog

Modems. Contact your sales or service representative to order product documentation.

Summary of content (24 pages)

PAGE 1
COMSPHERE 392xPlus Modems Models 3920Plus and 3921Plus Installation Instructions Document Number 3920-A2-GK41-60 February 2002 Overview The COMSPHERE Model 392xPlus modems are full-feature, high-speed leased modems, providing reliable asynchronous and synchronous operation over leased or dial-line networks with data rates as high as 33,600 bps.
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COMSPHERE 392xPlus Models The COMSPHERE 392xPlus modem is available in the following four models: • Model 3920Plus standalone singleport modem (model no. 3920-A1-41x). • Model 3920Plus standalone multiport modem (model no. 3920-A1-40x). • Model 3921Plus carrier-mounted singleport modem (model no 3921-B1-01x). • Model 3921Plus carrier-mounted multiport modem (model no. 3921-B1-00x).
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Model 3920Plus Singleport Modem The Model 3920Plus singleport is a standalone modem (Figure 1) capable of either 4-wire/2-wire leased-line or dial operation. This modem is controlled using either AT commands or the DCP. The DCP consists of a liquid crystal display (LCD), three function keys, four directional keys, and a row of 13 LED status indicators. For a better understanding of DCP operation, refer to Chapter 3, DCP Operation, in Document No. 3920-A2-GH30.
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Model 3921Plus Singleport Carrier-Mounted Modem The Model 3921Plus singleport is a carrier-mounted modem (Figure 2) capable of either 4-wire/2-wire leased-line or dial operation. The modem installs into a COMSPHERE 3000 Series Carrier, occupying a single slot. The modem’s faceplate has sixteen (16) LED status indicators for displaying modem activity and an audio speaker jack for the carrier’s optional speaker. The modem’s back panel has two edge card connectors that mount into a connector plate.
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Model 3921Plus Multiport Carrier-Mounted Modem The Model 3921Plus multiport is a carrier-mounted modem (Figure 3) equipped with an integral time division multiplexer (TDM) with a modem sharing device (MSD). The modem installs into the COMSPHERE 3000 Series Carrier, occupying two slots. The modem’s faceplate covers two slots in the carrier. It has twenty (20) LED status indicators for displaying modem activity and an audio speaker jack for the carrier’s optional speaker.
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392xPlus Modem Package After opening the modem’s package, check for damage and verify that the following items are present: For standalone models • Installation instructions • Model 3920Plus modem • Power supply with power cord • One 6-position, 4-wire modular cord (in selected models) • One 8-position, 8-wire modular cord (in selected models) For carrier-mounted models • Installation instructions • Model 3921Plus modem • One (singleport) or two (multiport) connector plates with two DB-25-S edge card connec
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Model 3920Plus Modem Installation Before installing your standalone modem, make sure your installation site is clean and well-ventilated. Allow space around the modem for installing cables and telephone cords, and make sure the modem is located within reach of the ac power outlet. The distance between your modem and DTE should be minimized if DTE data rates exceed 19,200 bps. Also, low capacitance cables may be necessary for speeds greater than 19,200 bps or distances greater than 50 feet.
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Connecting Cables to the Model 3920Plus Modem Instructions for connecting cables to the TELCO jack types using the appropriate cables apply to both singleport and multiport Model 3920Plus modems. Figure 4 illustrates the Model 3920Plus multiport modem. For pin assignments, refer to Appendix C, Pin Assignments, in Document No. 3920-A2-GH30.
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Data Terminal Equipment Connection Use the following steps to connect an EIA-232-D cable from the modem to a DTE: 1. Make sure the modem is powered OFF. 2. Connect the DB-25-P (plug) connector on the cable to a DB-25-S (socket) connector (Figure 4) on the modem’s back panel, labeled DTE 1 – DTE 4. Use a small screwdriver to secure the cable to the modem. 3. For each port, connect the DB-25-P connector on the cable to the DB-25-S connector on the DTE.
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Dial Network Connection The telephone company provides the line termination jacks for the permissive service you request. Advance coordination with the telephone company is suggested when connecting the modem to telephone dial lines (PSTN). In the Permissive mode, the modem’s transmit output level is fixed at –9 dBm. The telephone company assumes that the line loss is 3 dB and no compensation is provided for additional losses. A Permissive mode telephone line is usually terminated with a USOC RJ11C jack.
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Removing and Replacing the Model 3920Plus Modem To remove and replace the Model 3920Plus modem, perform the following steps: 1. Make sure the modem is offline. Press the modem’s back panel power switch to OFF. 2. Disconnect the power cord from the ac power outlet. 3. Disconnect the dc power cable from the connector on the back of the modem. 4. Disconnect the leased-line and dial modular cord(s) from the modem’s back panel. 5. Disconnect the DTE interface cable(s) from the modem’s back panel.
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1. At the back of the carrier, install the connector plates (Figure 5). Make sure the plate(s) use the same slot positions as that intended for the modem. Loosely fasten the plate(s). This allows for slight adjustments later when installing the modem. DTE A DTE A PORT 3 PORT 1 EIA232/V.24 SINGLEPORT BACK CONNECTOR PLATE MULTIPORT BACK CONNECTOR PLATES EIA232/V.24 CONNECTOR V.35 (3600/3500) PORT 2 RS366A/V.25 (3800) DTE B PORT 4 DTE B GROUNDING TAB FUTURE USE 495-14696-01 Figure 5.
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3000 SERIES CARRIER SDU MODEL 3921Plus SINGLEPORT MODEM LATCH CIRCUIT CARD GUIDES 3000 SERIES CARRIER SDU MODEL 3921Plus MULTIPORT MODEM LATCH CIRCUIT CARD GUIDES 495-14708 Figure 6.
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If the 3921Plus modem is to communicate with an installed SDCP, install the modem as described above and perform the following steps: 1. Press the Select key on the SDCP. The Carr:Slot screen appears with the cursor on the slot selection position (01 on the first LCD line in following screen example). Carr:Slot: ↑ ↓ F1 F2 1:01A 1:01A F3 2. Press the F1 ( " ) or F2 ( # ) key until the slot number you want appears. 3.
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CIRCUIT PACK LOCK LATCH OPEN CLOSED RELEASE TAB 495-14425-02 Figure 7. Circuit Pack Lock Removing the Model 3921Plus Modem CAUTION When removing the Model 3921Plus modem from the carrier, always use a ground strap when handling the modem. Always store the 3921Plus modems in an antistatic bag when it is removed from the carrier. It is not necessary to power down the carrier to remove the Model 3921Plus modem. Perform the following steps: 1.
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Model 392xPlus Modem Power-Up Once your modem is properly connected to the power supply, leased and/or dial lines, and the DTE, press the modem’s back panel power switch to the ON position. The modem begins a power-up self-test, in which all DCP LEDs light. This test takes several seconds to perform, and verifies the operation of most hardware components within the modem. If successful, the LCD displays Power on Selftst Passed and continues to the Top-Level menu screen.
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Using the Diagnostic Control Panel (DCP) The DCP’s liquid crystal display (LCD) consists of two 16-character lines which display modem status, control functions, and configuration options as well as indicating your location in the Top-Level menu tree. To change a factory template from the Sync Leased preset configuration using the DCP, perform the following steps: 1. Press the function key below Configure to select the Configure branch. The LCD now displays Ld EditArea frm.
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Menu Tree The following pages provide a graphic representation of the general menu structure of the front panel or SDCP display. Use the Menu Tree for reference when performing the modem’s various functions.
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Displays current status of modem along with data rate and error control mode. "Status" Status Configure PList Ld EditArea frm: Activ (Operating) Identity VF Major Minor Status Dial Thresh Security Port1 Port2 Port3 Port4 Backup SDC V.
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(Singleport mode only) from previous page Control Test SubHS Call_Setup Tlk/Data Security (Dial Backup only) Dial Answer Disconnect Choose Address (TMp Control only) Change_Directory Choose Password (TMp only) Dial_Standby or Return_to_Dial Secondary Directory Locations 1 – 24 Self Abort Rem_Digital_Loop Loc_Analog_Loop Loc_Digital_Loop Set_Access_Ctrl Data_Stream Reset Make_Busy or RemoveMakeBusy EIA_LEDS Reset_Security (Admin Password?) Download_Code (DownloadSoftware) Service_Li
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Important Safety Instructions 1. Read and follow all warning notices and instructions marked on the product or included in this document. 2. This product is intended to be used with a three-wire grounding type plug — a plug which has a grounding pin. This is a safety feature. Equipment grounding is vital to ensure safe operation. Do not defeat the purpose of the grounding type plug by modifying the plug or using an adapter.
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Notices WARNING 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 THE EQUIPMENT IS OPERATED IN A COMMERCIAL ENVIRONMENT. THIS EQUIPMENT GENERATES, USES, AND CAN RADIATE RADIO FREQUENCY ENERGY AND, IF NOT INSTALLED AND USED IN ACCORDANCE WITH THE INSTRUCTION MANUAL, MAY CAUSE HARMFUL INTERFERENCE TO RADIO COMMUNICATIONS.
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3. The ringer equivalence (REN) is used to determine the quantity of devices which may be connected to the telephone line. Excessive RENs on the telephone line may result in the devices not ringing in response to an incoming call. In most, but not all areas, the sum of the RENs should not exceed five (5.0). To be certain of the number of devices that may be connected to the line, as determined by the total RENs, contact the telephone company to determine the maximum RENs for the calling area. 4.
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Users should ensure for their own protection that the electrical ground connections of the power utility, telephone line and internal metallic water pipe system, if present, are connected together. This precaution may be particularly important in rural areas. CAUTION Users should not attempt to make such connections themselves, but should contact the appropriate electric inspection authority, or electrician, as appropriate.