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D-Series
Dial-Up Modem
TABLE OF CONTENTS
SECTION 1 - DESCRIPTION....................................................................... 2
SECTION 2 - SPECIFICATIONS.................................................................4
SECTION 3 - INSTALLATION.....................................................................5
SECTION 4 - FRONT PANEL INDICATORS ............................................ 9
SECTION 5 - INTERFACE SIGNALS....................................................... 10
SECTION 6 - TROUBLESHOOTING .......................................................11
SECTION 7 - WARRANTY.......................................................................... 12
Data Comm for Business, Inc.
807 Pioneer Street
Champaign, IL 61820 Revision Date: November 4, 1999
217-352-3207
8500073
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1. DESCRIPTION
1.0 Description
The DCB Dial-Up modem is available in 14.4, 33.6, or 56 Kbps (V.90)
versions. The case, connectors, power supply and lights are the same
for all three versions. The modem can be powered by an external AC
wall mount power supply, or by an optional internal 24, or 48 volt
DC supply. A rack front is available for the metal case, so it can be
easily rack mounted with one, two or three modems per 1U rack
height.
Applications for the D-Series modems include those industrial
strength applications where a rack mounting is required, a metal
enclosure is required, or where the power source available is DC,
rather than an AC wall outlet.
The slower models are quite useful for remote control applications.
Since the D series is available in a 14.4 Kbps model, it is faster
connecting than more complex modems which have to step down to
the slower speed only after failing negotiation at faster speeds. They
are also more reliable on marginal phone lines than commonly used
“retail store” modems.
1.1 Features
• Metal enclosure
• Stand alone or rack mounting
• Two-wire dial-up modem
• 14.4 Kbps, 33.6 Kbps or 56 K (V.90) modem
• DB-25 serial asynchronous interface
• LED’s for Power, TxD, RxD, DTR, DCD
• Ideal for remote data collection applications, SCADA, back-up
links, and remote controls.
• 120 VAC wall mount supply included
• Available with options for external 24 or 48 VDC power
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D33.6 Front and Rear Views
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2. SPECIFICATIONS
2.1 Specifications
2.1.1 General
Three model options, (14.4, 33.6 or 56 Kbps)
14.4 model – D14.4
33.6 model – D33.6
56K model – D56
For special power options, add the suffix -24 or -48 for 24 or 48
volt DC power
2.1.2 Front Panel Indicators
Power, TxD, RxD, DTR, DCD
2.1.3 Controls
Standard AT command set
2.1.4 Physical/Electrical
Power requirements: 12 VDC, 500 ma
Supports 9 to 18 VDC external power on 2.5mm x 5.5 mm power
connector
Options available for 24 or 48 VDC external power
Rack mount bezel available for 1, 2 or 3 units per 1U rack height
Size: 5.75" x 1.45" x .5.5"
Weight: one pound
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3. INSTALLATION
3.1 Unpacking
The following is included with each D Series Modem:
• Modem and external 120 VAC power supply
• Cable for connection to phone line
• Manual
• Information regarding warranty, maintenance contracts and
repair
3.2 Setup For Use With SR Series Multiplexers
To configure your SR Multiplexers to work with external DCB dialup modems first connect the modems to the multiplexers using the
Modem to Composite cable supplied. Next attach a terminal or PC to
the SR Network Management Port using the green cable and the
appropriate adapter (supplied). Set the terminal for 9600 8,N,1.
When you see “AT YOUR COMMAND >>”, follow the instructions
below. User responses are shown in BOLD.
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HOST MULTIPLEXER
AT YOUR COMMAND >> CN<Enter>
CONFIGURE NETWORK
-------------------------------
SYNC MODEM
LEASED LINE
ERROR CORRECTION ON
SYNC or ASYNC modem? [S/A] >> A<Enter>
ASYNC rate? [9600 / 19200 / 38400 / 57600 / 115200] >> 57<Enter>
Leased or Dialup Line? [L/D] >> D<Enter>
Enable Error Correction? [Y/N] >> Y<Enter>
Disconnect timeout? [1 to 99 min; 0=Disable] >> 0<Enter>
One-Touch Dialing? [ATDS0 / DTR Dial / OFF] >> OFF<Enter>
Send SR call progress messages? [Y/N] >> N<Enter>
ASYNC MODEM: 57600
DIALUP LINE
ERROR CORRECTION ON
Configure Modem? [Y/N] >> Y<Enter>
*** CONFIGURE MODEM - Type ESC ESC to stop
at<Enter>
OK
at&f &q6 s0=1 &w<Enter>
OK
Type <Esc><Esc> to return to AT YOUR COMMAND.
*** End CA/CC Capture
AT YOUR COMMAND >>
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REMOTE MULTIPLEXER
AT YOUR COMMAND >> CN<Enter>
CONFIGURE NETWORK
-------------------------------
SYNC MODEM
LEASED LINE
ERROR CORRECTION ON
SYNC or ASYNC modem? [S/A] >> A<Enter>
ASYNC rate? [9600 / 19200 / 38400 / 57600 / 115200] >> 57<Enter>
Leased or Dialup Line? [L/D] >> D<Enter>
Enable Error Correction? [Y/N] >> Y<Enter>
Disconnect timeout? [1 to 99 min; 0=Disable] >> 0<Enter>
One-Touch Dialing? [ATDS0 / DTR Dial / OFF] >> AT<Enter>
Send SR call progress messages? [Y/N] >> Y<Enter>
ASYNC MODEM: 57600
DIALUP LINE
ERROR CORRECTION ON
Configure Modem? [Y/N] >> Y<Enter>
*** CONFIGURE MODEM - Type ESC ESC to stop
at<Enter>
OK
at&f &q6<Enter>
OK
at&z0=nnn-nnnn<Enter> Note: Replace nnn-nnnn with the phone
number of the HOST Multiplexer.
OK
at&w<Enter>
OK
<Esc><Esc>
*** End CA/CC Capture
AT YOUR COMMAND >>
To make a connection to the host press <space> or <Enter> from any
terminal connected to the remote multiplexer. When you see “SR:
Connected…” you should be able to log in from all remote terminals.
If you set the remote multiplexer Disconnect timeout to a number
from 1 to 99 (minutes), the connection will hang up if there is no
activity to or from any terminal for that period of time. To
reestablish the connection, type <space> or <Enter> from any
terminal.
ONE-TOUCH DIALING
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3.3 Setup For Use With DCB Access Switch
To configure your Access Switch to work with the external DCB dial-
up modem first attach the modem to input port 1 (1 IN DTE) using
the Modem to Composite cable provided. Next attach a terminal or
PC to input port 2 (2 IN-DTE) using the green cable and the
appropriate adapter. Set the terminal for 9600 8,N,1. When you see
the Access >> prompt, follow the instructions below. User responses
are shown in BOLD.
To Disconnect enter: ^D^D^D
Access >> SETUP<Enter>
ATTENTION: There is no Setup Password
Enter PW to set password
**** Access Switch - V7.15 ****
AS-8
>> Enter H<CR> for Help
SETUP >> CM<Enter>
CONFIGURE MODEM
--------- -----
Port 1 as modem port - currently set to: NO
(Enter YES or NO) ? Y<Enter>
Current Modem Commands: &C1&D2S0=1&W
New Commands (enter "CLEAR" for default) ? <Enter>
Current dialout port timeout 15 seconds.
New timeout? <Enter>
SETUP >> BYE<Enter>
To Disconnect enter: ^D^D^D
Access >>
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4. FRONT PANEL INDICATORS
4.1 Indicators
Indicator Condition Meaning
Power ON Power is supplied to the modem
TxD Flickering Modem is sending data to the far end
RxD Flickering Modem is receiving data from the far end
DTR ON DTR is asserted by the attached DTE device
DCD ON Modem carrier is asserted
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5. INTERFACE SIGNALS
5.1 DTE Port Interface
Pin Signal In/Out
1 Frame Ground
2 Transmit Data IN
3 Receive Data OUT
4 Request to Send IN
5 Clear to Send OUT
6 Data Set Ready OUT
7 Signal Ground
8 Data Carrier Detect OUT
20 Data Terminal Ready IN
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7. TROUBLESHOOTING
7.1 General Approach
When troubleshooting problems, a rational plan can save you many
hours of frustration. The following is a brief outline of standard
troubleshooting procedures.
1. Gather the facts to determine the exact nature of the
problem.
2. Draw a picture of the system showing the equipment at both
the host and remote ends and the phone lines or in-house
wiring. Use this as a reference to note your observations,
test steps and test results. A picture keeps you focused and
often saves duplicate effort.
3. Record the front panel indications before changing anything.
This is an important part of fact gathering
4. If you change anything, change only one thing at a time.
5. Use the built-in test functions, especially the loopback tests.
Record your results.
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8. WARRANTY
DCB modems are warranted to be free of defects in materials and
workmanship for two years. Data Comm for Business, Inc. will
repair or replace any equipment proven to be defective within the
warranty period. All warranty work is F.O.B. Champaign, IL. This
warranty is exclusive of abuse, misuse, accidental damage, acts of
God or consequential damages, etc. DCB liability shall not exceed
the original purchase price.
All equipment returned for warranty repair must be accompanied by a
Returned Material Authorization (RMA) number. To receive an RMA
number, call (217) 352-3207 between 8 AM and 5 PM central time.
Equipment must be shipped prepaid to DCB and will be returned at
DCB's expense.
Data Comm for Business, Inc.
807 Pioneer Street
Champaign, IL 61820
Tel (217) 352-3207
Fax (217) 352-0350
Email support@dcbnet.com
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