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COMSPHERE 3920Plus Modems
Model Number 3920-A2-xxx
Installation Instructions
Document Number 3920-A2-GK47-10
February 2002
Overview
The COMSPHERE Model 3920Plus 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.
The COMSPHERE 3920Plus modem is available in several models. This document refers to model numbers in
the 3920-A2 series, which are singleport modems with single-rate power supplies. Modems in the 3920-A1 series
have universal power supplies and are described in the COMSPHERE 3900 Series Modems, Models 3920Plus
and 3921Plus, Installation Instructions, Document No. 3920-A2-GK41.
Through downloading capability, any Model 3920Plus 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 3 of the COMSPHERE 392xPlus
Modems, Models 3920Plus and 3921Plus, Technical Reference Manual, Document No. 3920-A2-GH30.
NOTE: Do not download firmware with a release number lower than 4.0 to a Model 3920-A2-xxx modem.
Model 3920Plus 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 3920Plus modems are compatible with a number of dialing methods and protocols, such as asynchronous
AT commands, CCITT V.25bis dialing, and the DCP. The DCP allows you to use the Model 3920Plus modem in
a variety of applications and environments while also providing control over modem configuration, dialing, and
diagnostics. The Model 3920Plus modems come with preset factory configurations that are the most often used
modem settings.
This document provides the following information:
• A description of the 3920Plus modem
• 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
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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 online at
www.paradyne.com. Select Library -> Technical Manuals -> Business Class Analog Modems.
Ordering Information
Call your sales representative to order additional product documentation or to verify the correct model number for
your geographic area.
COMSPHERE 3920Plus Modem
The Model 3920Plus singleport modem 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 the Technical
Reference Manual.
DIAGNOSTIC
CONTROL
PANEL
STATUS
INDICATORS
LEASED
DIAL
DTE 1
NMS
LCD AND
KEYPAD
POWER IN
POWER
ON/OFF
POWER
SUPPLY
97-14678-02
Figure 1. Model 3920Plus Modem (North America Model)
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392xPlus Modem Package
After opening the modem’s package, check for damage and verify that the following items are present:
• Installation instructions
• Model 3920Plus modem
• Power supply
• One 6-position, 4-wire modular cord (in selected models)
• One 8-position, 8-wire modular cord (in selected models)
If any hardware components are damaged, notify your sales or service representative. Return equipment using the
procedures described in Government Requirements and Equipment Return on page 11.
Customer-Supplied Equipment
The following customer-supplied equipment is required to complete a data communications system using the
Model 3920Plus modem:
• A DTE with available EIA-232-D serial port.
• A standard EIA-232-D cable with a DB-25-P (plug) connector at one end to attach to the modem.
• One or more of the following modular leased or dial network interfaces:
— JM8 for leased-line configurations.
— RJ11C for dial permissive configurations.
— One 8-position, 8-wire modular cord (for leased backup purposes).
Model 3920Plus Modem Installation
Before installing your modem, read the Important Safety Instructions on page 10.
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.
The back panel of the Model 3920Plus modem (Figure 2) has the following switches and connectors:
• An ON/OFF power switch.
• A cylindrical power receptacle (PWR) for the dc power supply.
• An 8-pin modular keyed jack (LEASED) for 4-wire/2-wire leased lines.
• An 8-pin modular keyed jack (DIAL) for backup lines (2-wire dial or 2-wire leased).
• A 4-pin modular jack (NMS) for the Network Management System connection.
• A 25-pin DB-25-S receptacle for the DTE interface.
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Model 3920Plus Input Voltage Requirements
The power supply used with model number 3920-A2-201 is a wall-mount transformer designed for 110 vac.
Additional models are available for other voltages and plug types.
Use only the power supply included with your modem.
Connecting Cables to the Model 3920Plus Modem
Figure 2 illustrates the Model 3920Plus modem cable connections. For pin assignments, refer to Appendix C in
the Technical Reference Manual.
DIAL
8-POSITION
PLUG FOR
LEASED-LINE
NETWORK
OPERATION
6-POSITION PLUG
FOR PERMISSIVE
DIAL NETWORK
OPERATION
LEASED
DTE 1
DB-25-P
CONNECTOR
FOR DATA
TERMINAL
EQUIPMENT
OPERATION
SUB-MINIATURE
4-POSITION
PLUG FOR
NETWORK
MANAGEMENT
SYSTEM
OPERATION
NMS
Figure 2. Model 3920Plus Back Panel and Power Supply
PWR ON
POWER
SUPPLY
OFF
97-14677-01
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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 the DB-25-S (socket) connector (Figure 2) on the
modem’s back panel, labeled DTE 1. Use a small screwdriver to secure the cable to the modem.
DTE rates above 19.2 bps require cable lengths less than fifty feet
as specified by the RS232 standard.
Power Supply Connection
Use the following steps to connect the modem to an ac power outlet:
1. Make sure the modem is powered OFF.
2. Insert the power supply’s cylindrical connector into the modem’s back panel dc power receptacle, labeled
PWR (Figure 2).
NOTE
3. Connect the power module to an ac power outlet.
Leased-Line Network Connection
Use the following steps to connect the leased-line network interface:
1. Insert the 8-position, 8-conductor modular plug into the jack labeled LEASED (Figure 2).
2. Insert the other end of the modular cord into the leased-line network interface.
3. If the Model 3920Plus has a backup line, follow the steps listed in the Dial Backup Connection section.
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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Leased Backup Connection
Use the following steps to connect the modem to the 2-wire leased backup network interface:
1. Insert the 8-position, 8-conductor modular plug into the jack labeled DIAL (Figure 2).
2. Insert the other end of the modular cord into the leased-line network interface.
Dial Backup Connection
Use the following steps to connect the modem to the dial network interface:
1. Insert the 6-position, 4-conductor modular plug into the jack labeled DIAL (Figure 2).
2. Insert the other end of the modular cord into the dial network interface.
Network Management System Connection
Use the following steps to connect the modem to the network management system (NMS) interface:
1. Insert the sub-miniature, 4-conductor modular plug of the 3600 Hubbing Device into the jack labeled
NMS (Figure 2). Refer to the 3600 Hubbing Device, Feature Number 3600-F3-300, Installation
Instructions, Document No. 3610-A2-GZ45, for a description of the 3600 Hubbing Device. Installation
for the 3920Plus is the same as for the 3610 DSU.
2. Connect the 3600 Hubbing Device to the network management system (Figure G-5 in Appendix G of the
Technical Reference Manual).
Removing and Replacing the Model 3920Plus Modem
T o 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 dc power cable from the connector on the back of the modem.
3. Disconnect the leased-line and dial modular cord(s) from the modem’s back panel.
4. Disconnect the DTE interface cable(s) from the modem’s back panel.
If the modem is to be removed for service, return it to the company using the procedures described in
Government Requirements and Equipment Return on page 11.
5. Install the replacement modem as described in the Model 3920Plus Modem Installation section, and
configure it the same way as the modem being replaced.
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Model 3920Plus 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 T op-Level
menu screen.
Power On Selftst
Passed
F1
F2
F3
If a failure occurs during the self-test, the LCD displays Power On Selftst Failed for several seconds. The LCD
then displays the T op-Level menu screen with the message Power on Fail appearing on the top line of the LCD.
Although a failure has occurred, the modem will attempt to operate. This allows you to activate a more thorough
self-test using the T est branch. Refer to the Test Branch section in Chapter 3 of the T echnical Reference Manual.
Selecting Factory Configuration Options
After the modem passes the power-up self-test, configure it for operation using one of the six factory preset
configurations.
The Model 392xPlus modems have six factory preset templates that contain the most commonly used
configuration options (straps) for Synchronous Leased (Answer or Originate), Asynchronous Leased (Answer or
Originate), Trellis Multipoint (Control or T ributary), Asynchronous Dial, Synchronous Dial, and UNIX Dial
hardware network configurations. Your modem is shipped from the factory with the Synchronous Leased
(Answer) default configuration options stored in memory. If Synchronous Leased (Originate), Asynchronous
Leased (Answer or Originate), Trellis Multipoint (TMp) (Control or T ributary), Async Dial, Sync Dial, or UNIX
Dial is more appropriate for your configuration, then you must change the factory setting using either the
modem’s DCP (as described in the following sections) or the AT command set.
The purpose of having preset configurations is so that you can have a “head start” in getting your modem
operating and reducing the amount of time required to configure your modem. For a better understanding of DCP
operation and factory preset configuration options, refer to Chapter 4, DCP Configuration, in Technical Reference
Manual.
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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 T op-Level menu tree.
T o 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.
2. Press the
configurations.
Factory preset configurations are Sync Leased, Async Leased, TMp (Trellis Multipoint), Async Dial,
Sync Dial, and UNIX Dial. If Sync Leased or Async Leased is selected, you must choose either Answer
or Originate mode. If TMp is selected, you must choose either Control or Trib (Tributary) mode.
3. Press the
function key to select your choice. (For certain factory presets you will also need to choose the
appropriate mode.)
4. Choose Function appears and displays the Edit and Save functions.
5. Press the F3 key (Save) to save the new factory preset configuration to one of three configuration areas,
Active (Saved), Customer 1, or Customer 2.
(These three configuration areas are nonvolatile memory locations. Active (Saved) contains the most
recently saved changes to any configuration options. In the event of power loss, the modem retrieves these
configuration options. Customer 1 and Customer 2 are user-defined configuration areas.)
The LCD now displays Sav EditArea to.
6. Press the
corresponding function key to select your choice. (Saving configuration options to the Active (Saved)
configuration area automatically saves them to the Active (Operating) configuration area.) The LCD
displays Command Complete.
key until Factory comes into view, then press the F1 key to display the factory preset
key until the appropriate factory preset appears on the LCD, and press the corresponding
key until the appropriate configuration area appears on the LCD, then press the
7. The modem is now configured with the selected factory template. Press the
T op-Level menu.
Refer to Chapter 4, DCP Configuration, in the Technical Reference Manual, for more information regarding
default factory configuration options.
Menu Tree
The following page provides 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.
8
key to return to the
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3920-A2-GK47-10 February 2002
Status Configure PList Control Test SubHS Call_Setup Tlk/Data Security Remote
Does not appear in TMp Control mode.
Does not appear in Remote mode.
(Self, Loc_Digital_Loop, and Pattern
appear if the secondary channel is
used. Rem_Digital_Loop does not
appear in TMp mode.)
Choose Address
(TMp Control only)
Choose Password
(TMp only)
Secondary
Prim
(data blckd)
(ExitRem appears
instead of Remote when
using Remote mode)
UNIX_Dial
(Tributary
only)
Sync_Leased
Async_Leased
Choose Mode
Answer
Originate
TMp
Choose Mode
Control
Trib
Async_Dial
Sync_Dial
Activ
(Operating)
Active
(Saved)
Customer1
Customer2
Factory
Ld EditArea frm:
Choose Function
Save
Active
(Saved)
Customer1 Customer2
"Status"
Displays current status of modem along with
data rate and error control mode.
Dial
Disconnect
Answer
Dial_Standby
or
Return_to_Dial
Change_Directory
Directory Locations 1 24
(Dial
Backup
only)
Display
Clear
Change Add Acquire
Active
Delete
Skip
Abort
Self
Loc_Analog_Loop
Rem_Digital_Loop
Loc_Digital_Loop
Pattern
(Singleport mode
only)
97-14651-04
Speaker
Reset
Data_Stream
EIA_LEDS
Make_Busy
or
RemoveMakeBusy
Service_Line
or
DiscServLine
Download_Code
(DownloadSoftware)
VF_Thresh_Update
(3921Plus
only)
Edit StrapGroup
Set_Access_Ctrl Reset_Security
(Admin Password?)
EditPassWdTable
Set_Answer_Sec
Set_Orig_Secur
Set_Admin_PsWd
DTE_Interface
DTE_Dialer
Line_Dialer Leased_Line Test Security
Dial_Line
V42/MNP/Buffer
Misc
MUX Copy Port1
Port2
*
Port3*Port4
*
Rate
*
Async EIA
(Mux Enabled only)
(Singleport mode
only)
(Singleport mode
only)
(Singleport mode
only)
*
Not shown when the Digital Bridge configuration option is enabled.
DeviceHSVFIdentity
DTE
Backup
Options
Record
Major
Minor
Status
Dial
Thresh
Security
Port1
Port2
Port3
Port4
SigQual
RcvLevel
Sig/Noise
NrEchLv
FarEchLv
FarEchDel
EchoFreqOff
Phase Hts
Impul Hts
DropOuts
Retrains
Phas Jtr
NonLnear
FreqOffset
Gain Hts
Ser#
Mod#
FRev
HPt#
FPt#
Country
LSD
DTR
DSR
Ts t
TXD
RXD
RTS
CTS
Line = Pri 4W APL
Line = Pri 2W APL
Line = Bkup 2W APL
Line = Dial Backup
Line = Dial ONLY
Line = No Sync
Display
Clear
Display
Clear
Service_Log
Port Select
(Multiport
mode)
SDC
Tx
Rx
DTE Rate
Cmp Ratio
Efficiency
V.34
TxRate
RxRate
SymbolRate
TxLevel
AsymRate
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Important Safety Instructions
1. Read and follow all warning notices and instructions marked on the product or included in the manual.
2. Slots and openings in the cabinet are provided for ventilation. T o ensure reliable operation of the product
and to protect it from overheating, these slots and openings must not be blocked or covered.
3. Do not allow anything to rest on the power cord and do not locate the product where persons will walk on
the power cord.
4. Do not attempt to service this product yourself, as opening or removing covers may expose you to
dangerous high voltage points or other risks. Refer all servicing to qualified service personnel.
5. General purpose cables are provided with this product. Special cables, which may be required by the
regulatory inspection authority for the installation site, are the responsibility of the customer.
6. When installed in the final configuration, the product must comply with the applicable Safety Standards
and regulatory requirements of the country in which it is installed. If necessary, consult with the
appropriate regulatory agencies and inspection authorities to ensure compliance.
7. Input power to this product must be provided by one of the following: (1) a UL Listed, CSA Certified
power source with a Class 2 or Limited Power Source (LPS) output for use in North America, or (2) a
certified power source with a Safety Extra Low Voltage (SELV) output for use in the country of
installation.
In addition, if the equipment is to be used with telecommunications circuits, take the following
precautions:
– Never install telephone wiring during a lightning storm.
– Never install telephone jacks in wet locations unless the jack is specifically designed for wet locations.
– Never touch uninsulated telephone wires or terminals unless the telephone line has been disconnected at
the network interface.
– Use caution when installing or modifying telephone lines.
– Avoid using a telephone (other than a cordless type) during an electrical storm. There may be a remote
risk of electric shock from lightning.
– Do not use the telephone to report a gas leak in the vicinity of the leak.
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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. THISEQUIPMENT GENERATES, USES,AND CAN RADIATERADIO FREQUENCY ENERGYAND, IF NOT
INSTALLEDAND USEDIN ACCORDANCEWITH THE INSTRUCTION MANUAL, MAYCAUSE HARMFUL INTERFERENCE
TO RADIO COMMUNICATIONS. OPERATION OF THIS EQUIPMENT IN A RESIDENTIAL AREA IS LIKELY TO CAUSE
HARMFUL INTERFERENCE IN WHICH CASE THE USER WILL BE REQUIRED TO CORRECT THE INTERFERENCE AT
HIS OWN EXPENSE.
THE AUTHORITY TO OPERATE THIS EQUIPMENT IS CONDITIONED BY THE REQUIREMENTS THAT NO
MODIFICATIONSWILL BE MADE TO THE EQUIPMENT UNLESS THE CHANGES ORMODIFICATIONS ARE EXPRESSLY
APPROVED BY PARADYNE.
WARNING
TO USERS OF DIGITAL APPARATUS IN CANADA:
THIS CLASS A DIGITAL APPARATUS MEETS ALL REQUIREMENTS OF THE CANADIAN INTERFERENCEĆCAUSING
EQUIPMENT REGULATIONS.
CET APPAREIL NUMÉRIQUE DE LA CLASSE A RESPECTE TOUTES LES EXIGENCES DU RÈGLEMENT SUR LE
MATÉRIEL BROUILLEUR DU CANADA.
Government Requirements and Equipment Return
Certain governments require that instructions pertaining to modem connection to the public switched telephone
network be included in the installation and operation manual. Specific instructions are listed in the following
sections.
United States
Notice to Users of the Public Switched Telephone Network
1. This equipment complies with Part 68 of the FCC rules. On the equipment is a label that contains, among
other information, the FCC registration number and ringer equivalence number (REN) for this equipment.
The label is located on the bottom of the modem. If requested, this information must be provided to the
telephone company.
2. The Universal Service Order Code (USOC) for Permissive mode is RJ11C. The Canadian equivalent to
the USOC is CA11.
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). T o 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.
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4. If the 3920Plus modem causes harm to the telephone network, the telephone company will notify you in
advance that temporary discontinuance of service may be required. But if advance notice is not practical,
the telephone company will notify the customer as soon as possible. Also, you will be advised of your
right to file a complaint with the FCC if you believe it is necessary.
5. The telephone company may make changes in its facilities, equipment, operations, or procedures that
could affect the operation of the equipment. If this happens, the telephone company will provide advance
notice in order for you to make the necessary modifications in order to maintain uninterrupted service.
6. If you experience trouble with this equipment, please contact your sales or service representative (as
appropriate) for repair or warranty information. If the product needs to be returned to the company service
center for repair, contact them directly for return instructions using one of the following methods:
• Via the Internet: Visit the Paradyne World W ide Web site at http://www.paradyne.com
• Via Telephone: Call our automated call system to receive current information via fax or to speak
with a company representative.
– Within the U.S.A., call 1-800-870-2221
– International, call 727-530-2340
If the trouble is causing harm to the telephone network, the telephone company may request that you
remove the equipment from the network until the problem is resolved.
7. The user is not authorized to repair or modify the equipment.
8. This equipment cannot be used on public coin service provided by the telephone company. Connection to
Party Line Service is subject to state tariffs. (Contact the state public utility commission, public service
commission or corporation commission for information.)
9. The T elephone Consumer Protection Act of 1991 makes it unlawful for any person to use a computer or
other electronic device to send any message via a telephone fax machine unless such a message clearly
contains, in a margin at the top or bottom of each transmitted page, or on the first page of the
transmission, the date and time it is sent, and an identification of the business, or other entity, or other
individual sending the message, and the telephone number of such business, or other entity, or individual.
In order to program this information, follow the steps outlined in the manual supplied with your fax
software.
10. An FCC compliant telephone cord with modular plugs may be provided with this equipment. This
equipment is designed to be connected to the telephone network or premises wiring using a compatible
modular jack which is Part 68 compliant.
Canada
Notice to Users of the Canadian Public Switched Telephone Network
The Canadian Department of Communications label identifies certified equipment. This certification means that
the equipment meets certain telecommunications network protective, operational and safety requirements. The
Department does not guarantee the equipment will operate to the user’s satisfaction.
Before installing this equipment, users should ensure that it is permissible to be connected to the facilities of the
local telecommunications company. The equipment must also be installed using an acceptable method of
connection. In some cases, the company’s inside wiring associated with a single line individual service may be
extended by means of a certified connector assembly (telephone extension cord). The customer should be aware
that compliance with the above conditions may not prevent degradation of service in some situations.
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February 2002 3920-A2-GK47-10
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Japan
Repairs to certified equipment should be made by an authorized Canadian maintenance facility designated by the
supplier. Any repairs or alterations made by the user to this equipment, or equipment malfunctions, may give the
telecommunications company cause to request the user to disconnect the equipment.
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.
The Load Number for this equipment is on the label on the modem. The Load Number (LN) assigned to each
terminal device denotes the percentage of the total load to be connected to a telephone loop which is used by the
device to prevent overloading. The termination on a loop may consist of any combination of devices subject only
to the requirement that the total of the Load Numbers of all devices does not exceed 100.
If your equipment is in need of repair, refer to the procedure in Government Requirements and Equipment Return
on page 11.
Warranty, Sales, and Service Information
Contact your local sales representative, service representative, or distributor directly for any help needed. For
additional information concerning warranty, sales, service, repair, installation, documentation, training, distributor
locations, or Paradyne worldwide office locations, use one of the following methods:
• Internet: V isit the Paradyne World Wide Web site at www.paradyne.com
• Telephone: Call our automated system to receive current information via fax or to speak with a company
representative.
— Within the U.S.A., call 1-800-870-2221
— Outside the U.S.A., call 1-727-530-2340
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*3920-A2-GK47-10*
*3920–A2–GK47–10*
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