Raymar DSP9612RM User manual

DSP9612RM USER’S GUIDE
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DSP9612RM Flash Poll
Rack-Mount Modem
User’s Guide

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The products and programs described in this User’s Guide are licensed products
of Raymar Information Technology, Inc. This User’s Guide contains proprietary
information protected by copyright, and this User’s Guide and all accompanying
hardware and documentation are copyrighted.
Raymar Information Technology, Inc. does not warrant that the hardware will
work properly in all environments and applications, and makes no warranty and
representation, either implied or expressed, with respect to the quality,
performance, merchantability, or fitness for a particular purpose.
Information in this User’s Guide is subject to change without notice and does not
represent a commitment on the part of Raymar Information Technology, Inc.
Raymar Information Technology, Inc. assumes no responsibility for any
inaccuracies that may be contained in this User’s Guide.
Raymar Information Technology, Inc. makes no commitment to update or keep
current the information in this User’s Guide, and reserves the right to make
changes to this User’s Guide and/or product without notice.
No part of this manual may be reproduced or transmitted in any form or by any
means, electronic or mechanical, including photocopying, recording, or
information storage and retrieval systems, for any purpose other than the
purchaser's personal use, without the express written permission of Raymar
Information Technology, Inc.
©Copyright 2010
Raymar Information Technology, Inc.
7325 Roseville Road
Sacramento, California 95842
Tel: [phone]
Direct: [phone]
Fax: [phone]

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Compliances
This device complies with Part 15A of the FCC Rules. Operation is subject to the
following two conditions: (1) this device may not cause harmful interference, and
(2) this device must accept any interference received, including interference that
may cause undesired operation.
This equipment has been tested and found to comply with the limits for a Class A
digital device, pursuant to Part 15A of the FCC Rules. These limits are designed
to provide reasonable protection against harmful interference in a residential
installation. This equipment generates, uses, and can radiate radio frequency
energy and, if not installed and used in accordance with the instructions, may
cause harmful interference to radio communications. However, there is no
guarantee that interference will not occur in a particular installation. If this
equipment does cause harmful interference to radio or television reception, which
can be determined by turning the equipment off and on, the user is encouraged to
try to correct the interference by one or more of the following measures:
Reorient or relocate the receiving antenna.
Increase the separation between the equipment and the receiver.
Connect the equipment to an outlet on a circuit other than the one to which
the receiver is connected.
Consult the dealer or an experienced radio/TV technician for help.
If none of these actions resolves the problem, consult your distributor or an
experienced radio/television technician for additional suggestions.
Additionally, Section 15.838, paragraph d), of the FCC Rules and Regulations
states: “Where special accessories, such as shielded cables, are required in order
to meet FCC regulations, shielded cables must be used with this equipment.
Operation with non-approved equipment or unshielded cables is likely to result in
interference to radio and TV reception. The user is cautioned that changes and
modifications to this equipment without the approval of the manufacturer could
void the user’s authority to operate this equipment.

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Contents
CHAPTER 1 INTRODUCTION......................................1
FEATURES.............................................................................2
APPLICATIONS ......................................................................2
ANCILLARY DOCUMENTATION..............................................3
CHAPTER 2 INSTALLATION .......................................4
UNPACKING YOUR HARDWARE ............................................4
ADDITIONAL ITEMS YOU NEED.............................................4
HARDWARE OVERVIEW ........................................................4
Front View........................................................................4
Component View...............................................................5
INSTALLATION SUMMARY.....................................................7
CONFIGURING THE MODEM...................................................7
SW1 DIP Switch Settings..................................................8
SW2 DIP Switch Settings................................................11
SW3 DIP Switch Settings................................................14
INSTALLING THE MODEM....................................................18
CONNECTING TO A TRANSMISSION LINE .............................19
Modular Jack Connectors ..............................................19
Mass Termination Connector.........................................20
CONNECTING AN RS-232 DEVICE.......................................20
LEDS..................................................................................21
LOOPBACK CONTROL SWITCH ............................................21
APPENDIX A TROUBLESHOOTING.........................27
PROBLEM SOLVING.............................................................27
APPENDIX B SPECIFICATIONS................................24
GENERAL SPECIFICATIONS..................................................24
MECHANICAL SPECIFICATIONS ...........................................25
BACK-TO-BACK CONNECTIONS TO A SECOND MODEM.......26
RS-232 (RTU) Interface..................................................26
ENVIRONMENTAL SPECIFICATIONS .....................................27
APPENDIX C LIMITED PRODUCT WARRANTY...28
APPENDIX D RMA PROCEDURE..............................29

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Chapter 1
Introduction
Congratulations for purchasing the finest industrial-grade fast-poll rack-mount
modem available.
The Raymar-Telenetics DSP9612RM (Flash Poll) modem is a 9600/4800/0-1800
bps rack-mount modem designed for 4-wire, full-duplex or 2-wire, half-duplex
operation over a voice-band leased line. The modem is designed utilizing the
latest digital-signal processing (DSP) technology to achieve high performance.
The modem employs Raymar-Telenetics’ proprietary modulation and encoding
scheme to achieve fast modem training time. It is also backward compatible with
Bell 202 modems.
The modem can be installed in an RM16M Rack (16 slots, 3U) or the RMX Shelf
(2 slots, 1U) from Raymar-Telenetics. The modem occupies only one rack slot,
eliminating the hassle of equipment trays and power bricks required for “Stand
Alone” modems. The modem is powered from the modem rack.
The DSP9612RM modem is ideally suited for multi-point communication
systems that require fast response time, short training time, and low throughput
delay. The modem is the most technologically advanced rack-mount modem on
the market.
This User’s Guide is designed to let you get your modem “up and running” as
quickly as possible. It contains all the information you need to install and
configure your modem. It also contains troubleshooting information in the
unlikely event you encounter a problem with your modem.

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Features
Though functionally similar to commercial modems, the DSP9612RM provides
the following unique features that make it well suited for utility and industrial
applications.
Requires only one rack slot.
Operates over voice-band conditioned or unconditioned leased line and
pilot wires.
Operates without human intervention, making it ideal for unmanned
locations.
Works within an extended temperature range of -40ºC to +85ºC.
Designed with coupling transformers for high-voltage isolation and
common mode noise rejection in industrial and commercial environments.
Asynchronous data rates (selectable) of 9600, 4800, and 0-1800 bps.
Easily accessible DIP switches for user configuration and option selection.
Local analog, local digital, and remote digital loopback diagnostics.
Applications
The DSP9612RM modem is designed for point-to-point and multipoint data
communications. Figure 1-1 shows a typical multipoint configuration.
Figure 1-1. Network of Multipoint Configuration

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There are a number of factors that can affect the network’s and modem’s
operation and performance. These include:
Operating speed
2-wire or 4-wire configuration
Transmission line characteristics, noise, and line impairments
Network configuration (point-to-point or multipoint)
Number of nodes on the network
Ancillary Documentation
For information about how to adapt an AC powered DSP9612RM modem to a
DC power operation, refer to the included documents (0062-0117-001). Also
refer to the RM16M Installation and Operation Guide (TEL-6200508506004).

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Chapter 2
Installation
This chapter describes how to install the modem.
Unpacking Your Hardware
Your package should include:
At least one DSP9612RM modem
This User’s Guide (on CD)
If your package contents are damaged or missing, please contact your place of
purchase immediately.
Additional Items You Need
To use your modem, you need the following additional items:
An RM16M Rack or an RMX Shelf from Raymar-Telenetics
A two- or four-wire transmission line or leased line
Hardware Overview
Front View
Figure 2-1 shows a front view of the DSP9612RM modem. Starting from the top,
this view shows:
A loopback test switch. See page 21.
A set of eight LEDs. See page 21.

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Figure 2-1. Front View of Modem
Component View
Figure 2-2 shows the component view of the modem. This view shows:
Three configuration switch blocks, designated SW1, SW2, and SW3. See
page 7.
Jumpers located in various positions on the modem. Do not change or
remove the straps from these jumpers.
Edge connectors at the back of the modem, which plug into the backplane
of an RMX Shelf or an RM16M Rack from Raymar-Telenetics.

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Figure 2-2. Component View of Modem
Edge Connectors Configuration
Switch Blocks
Switch Block
SW2 Switch Block SW1
Switch Block SW3

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Installation Summary
The modem installation involves the following steps:
1. Configuring the modem. See below.
2. Connecting to a transmission line. See page 19.
3. Connecting an RS-232 device. See page 20.
Configuring the Modem
You configure the modem using the three sets of DIP switches on the bottom of
the modem.
,
IMPORTANT
It is important to follow the three
steps described below, in the order
shown, to ensure that you configure
your modem properly using the
modem DIP switches:
1. Use DIP switch 3 (SW3) to
configure the modem for your
host DTE interface and network
topology. Using SW3, you
select the modem to operate in
high-speed fast-poll or low-
speed (FSK) mode.
2. If you set SW3 for FSK mode
in step 1, use DIP switch 2
(SW2) to configure the modem
for either Bell 202T or ITU-T
V.23 compatibility. Otherwise,
you can use the modem in
fallback mode.
3. Use DIP switch 1 (SW1) to
select the modem’s transmitter
output level and receiver
dynamic range. The SW1
settings apply for both high-
speed fast-poll and low-speed
(FSK) modes.

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SW1 DIP Switch Settings
SW1 is an 8-position DIP switch. Table 2-1 shows the modem switch settings for DIP
switch SW1. A description of the SW1 switch settings follows the table.
Note: SW1 settings apply for both high-
speed fast-poll and low-speed (FSK)
modes
Table 2-1. Modem Switch Settings for DIP Switch SW1
Switch SettingsSwitches
ON OFF
(Default)
SW1-1 −SW1-4: Transmit
Level (page 9) (see Table 2-2 on page 9)
SW1-5: Receiver Dynamic
Range (page 10) −10 to −43 dBm +3 to −30 dBm
SW1-6: TX Cable Equalizer
(page 10) Enabled Disabled
SW1-7: RX Cable Equalizer
(page 10) Enabled Disabled
SW1-8: Anti-streaming (page
10) Active Inactive

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SW1-1 through SW1-4 − Transmit Level
Switches SW1-1 through SW1-4 adjust the modem’s transmit level. Table 2-2
shows the transmit levels you can select using these switches.
Table 2-2. Transmit Levels
SW1 through SW4 Switch Settings
Transmit Level SW1-1 SW1-2 SW1-3 SW1-4
0 dBm OFF OFF OFF OFF
−1 dBm OFF OFF OFF ON
−2 dBm OFF OFF ON OFF
−3 dBm OFF OFF ON ON
−4 dBm OFF ON OFF OFF
−5 dBm OFF ON OFF ON
−6 dBm OFF ON ON OFF
−7 dBm OFF ON ON ON
−8 dBm ON OFF OFF OFF
−9 dBm ON OFF OFF ON
−10 dBm ON OFF ON OFF
−11 dBm ON OFF ON ON
−12 dBm ON ON OFF OFF
−13 dBm ON ON OFF ON
−14 dBm ON ON ON OFF
+3 dBm ON ON ON ON

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SW1-5 − Receiver Dynamic Range
SW1-5 ON = −10 to −43 dBm
OFF = +3 to −30 dBm
For a low receive signal level, set SW1-5 to ON (−43 dBm ). For short distances
or to select a strong receive signal, set SW1-5 to OFF.
SW1-6 and SW1-7 − Cable Equalizer (Fast-Poll Mode Only)
SW1-6 ON = Enable TX Cable Equalizer
OFF = Disable TX Cable Equalizer
SW1-7 ON = Enable RX Cable Equalizer
OFF = Disable RX Cable Equalizer
To improve or extend the modem’s polling performance, use the fixed
Compromise Cable Equalizer when polling on long metallic circuits. The cable
equalizer is active only when the modem is in fast-poll mode (SW3-1 set to OFF).
SW1-8 − Anti-streaming
SW1-8 ON = Anti-streaming active
OFF = Anti-stream inactive
Typically, anti-streaming is used in multi-point applications to prevent a
malfunctioning slave modem from occupying the line indefinitely. When anti-
streaming is active, the modem can transmit data for a maximum of 27 seconds
before the transmitter turns off automatically. The modem then looks for an ON-
to-OFF Request To Send (RTS) transition before proceeding with normal
operation. Anti-streaming can be selected in either high-speed or low-speed
mode.

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SW2 DIP Switch Settings
SW2 is an 8-position DIP switch. Table 2-3 shows the modem switch settings for
DIP switch SW2. A description of the SW2 switch settings follows the table.
Table 2-3. Modem Switch Settings for DIP Switch SW2
Switch SettingsSwitches
ON OFF (Default)
SW2-1: FSK Mode (page 12) V.23 Bell 202
SW2-2: Receiver Squelch
(page 12)
(valid for FSK mode, 2-wire
half-duplex operation only)
Turnaround Squelch
(Bell 202): 8ms
Turnaround Squelch
(V.23): 150ms
Turnaround Squelch
(Bell 202): 0ms
Turnaround Squelch
(V.23): 0ms
SW2-3: FSK Soft Carrier
(page 13) Disabled Enabled
SW2-4 and SW2-5: FSK
RTS-CTS Delay
(page 13)
(see Table 2-4)
SW2-6: FSK CD Delay
(page 13) 23ms 6ms
SW2-7: Remote Loopback
(page 14) Enabled Disabled
SW2-8: Reserved (Test Only)
(page Error! Bookmark not
defined.)
Test Normal

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SW2-1 ⎯ FSK Mode
SW2-1 ON = ITU-T V.23 mode
OFF = Bell 202 mode
The modem has two FSK modes:
Bell 202, which supports data rates from 0 to 1800 bps
ITU-T V.23, which supports data rates from 0 to 1200 bps
SW2-1 configures the modem for either of these FSK modes. Setting SW2-1 to
ON selects ITU-T V.23 mode. In this mode, the modem complies with ITU-T
(CCITT) recommendation V.23 with the following parameters:
Mode 2 modulation only
No backward channel
No provisions for disablement of echo suppressors
DTR (circuit 108) is ignored
Setting SW2-1 OFF selects Bell 202 mode.
SW2-2 ⎯ Receiver Squelch (FSK Mode 2-Wire Half-Duplex Only)
SW2-2 ON = 8ms for Bell 202, 150ms for ITU-T V.23
OFF = 0ms
SW2-2 configures the turnaround squelch delay and is valid when the following
are active:
FSK mode (SW3-1 ON)
2-wire half-duplex operation (SW3-7 ON)
Setting this switch to OFF configures the modem to enable its receiver
immediately after the Request To Send (RTS) signal is turned off. When this
switch is set to OFF and the modem is configured for 2-wire, half-duplex mode
(SW3-7 ON), the modem squelches the receiver after RTS is turned off to prevent
far-end echoes from causing data errors. The duration that the modem squelches
the receiver is either:
8 milliseconds if the modem is configured for Bell 202 mode (SW2-1
OFF)
150 milliseconds if the modem is configured for ITU-T V.23 mode (SW2-
1 ON)

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SW2-3 ⎯ FSK Soft Carrier (Bell 202 FSK Mode Only)
SW2-3 ON = None
OFF = 8ms
SW2-3 controls the soft carrier and is valid for Bell 202 FSK mode only (SW2-1
set to OFF). Setting this switch to OFF configures the modem to transmit a 900
Hz soft carrier to the remote modem for 8 milliseconds after RTS is turned off.
Setting this switch to ON prevents the modem from transmitting a soft carrier
after RTS is turned off.
SW2-4 and SW2-5 ⎯ RTS-CTS Delay (Bell 202 Mode Only)
Switches SW2-4 and SW2-5 determine the duration of the RTS-CTS delay in Bell
202 mode. Table 2-4 shows how to set these switches to select the appropriate
setting.
Table 2-4. RTS-CTS Delay Settings in Bell 202 Mode
To Select a Delay
of… Set SW2-4 to… And Set SW2-5 to…
8ms OFF OFF
33ms OFF ON
59ms ON OFF
219ms ON ON
When the modem is configured for V.23 operation (SW2-1 ON), the RTS-CTS
delay is fixed at 33 ms.
SW2-6
⎯ FSK CD Delay (Bell 202 Mode Only)
SW2-6 ON = 23ms
OFF = 6ms
SW2-6 selects the FSK CD delay and is valid when Bell 202 mode is active
(SW2-1 OFF). Setting SW2-6 ON configures the modem to turn on CD 23
milliseconds after it detects a valid carrier signal. Setting this switch to OFF
configures the modem to turn on CD 6 milliseconds after it detects a valid carrier
signal.
This switch setting is deactivated when the modem is configured for V.23 mode
(SW2-1 ON) and a delay of 18 milliseconds is used instead.

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SW2-7 ⎯ Remote Loopback
SW2-7 ON = Loopback enabled
OFF = Loopback disabled
During instances of channel noise, the modem may mistake a received preamble as a
request to go into remote digital loopback. Setting SW2-7 to OFF prevents the modem
from participating in a remote digital loopback with another modem. SW2-7 does not
prevent the modem from sending a remote digital loopback request to a remote modem.
SW2-8 ⎯ Reserved (Test Only)
SW2-8 Must be OFF
SW2-8 must be in the OFF position for normal operation.
SW3 DIP Switch Settings
SW3 is a 10-position DIP switch. Table 2-5 shows the modem switch settings for DIP
switch SW3. A description of the SW3 switch settings follows the table.
Table 2-5. Modem Switch Settings for DIP Switch SW3
Switch SettingsSwitches
ON OFF (Default)
SW3-1: Fast Poll/FSK (page 15) FSK Fast Poll Auto-
Rate
SW3-2: Data Rate (page 15) 4800 bps 9600 bps
SW3-3: Async Character (page 16) 11 bits 10 bits
SW3-4: Auto RTS (page 15) Enabled Disabled
SW3-5: Transmitter Termination
(page 16) Switched by RTS 600 Ω
SW3-6: Reserved (Test Only)
(page 16) Test Normal
SW3-7: 2- or 4-wire (page 17) 2-wire, half-duplex 4-wire, full-
duplex
SW3-8: Carrier Control (page 17) Constant Switched
SW3-9: Rx Termination (page17) 600 ΩHigh Rx
Impedance
SW3-10: Signal Ground and Earth
Ground Option (page 17) Connected Separated

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SW3-1 − Fast Poll Auto Rate/FSK
SW3-1 ON = Low-Speed Mode (FSK)
OFF = High-Speed Mode (Fast Poll)
The modem has two operating modes:
FSK mode, which supports data rates from 0 to 1800 bps.
Fast-poll mode, which supports data rates of 4800 and 9600 bps.
SW3-1, along with the Data Rate Selector (DRS) pin on the modem’s RS-232
connector, configures the modem for either FSK or fast-poll mode. Table 2-6
shows how SW3-1 and the DRS signal configure the modem for these operating
modes.
Table 2-6. Modem Operating Mode
To Select… Set SW3-1 to… And the DRS Signal…
Fast-poll mode OFF Is not connected or is set
HIGH
FSK mode OFF Is set LOW
FSK mode ON Doesn’t care
You should use the DRS signal in RTS control mode. It does not work in either
constant carrier mode (SW3-8 set to ON) or in the auto-RTS mode (SW3-4 set to
ON). The DRS signal is only sampled when the transmitter is idle (when not
sending a preamble, data, or a turn-off sequence).
Note that the DRS control both the transmitter and receiver. If DRS changes
states while the modem is receiving a preamble, data, or a turn-off sequence, the
state of the receiver is unknown until the carrier drops and a new preamble is
received. We recommend that the DRS does not change states until both the local
and remote modems’ transmitters are in the idle state. When they are, both the
local and remote modems’ DRS signal should change states.
SW3-2 − Data Rate (Fast-Poll Mode Only)
SW3-2 ON = 4800 bps
OFF = 9600 bps
SW3-2 configures the modem speed. When the modem is in high-speed fast-poll
mode (SW3-1 OFF), setting SW3-2 ON selects 4800 bps, while setting SW3-2
OFF selects 9600 bps.

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SW3-3 − Async Character (Fast-Poll Mode Only)
SW3-3 ON = 11 bits
OFF = 10 bits
Switch SW3-3 selects whether the async character is 10 or 11 bits long. When the
modem is in high-speed fast-poll mode (SW3-1 OFF), setting SW3-3 ON selects an 11-
bit async character, while setting SW3-3 OFF selects a 10-bit async character.
SW3-4 − Auto RTS (Fast-Poll Mode Only)
SW3-4 ON = Enable Auto RTS
OFF = Disable Auto RTS
For data terminals that do not support hardware RTS, set SW3-4 to ON to enable auto
RTS mode. In this mode, TXD is detected at the modem and an internal RTS signal is
turned ON. After training completes, the TXD is transmitted to the remote modem. The
transmitter turns off if no TXD is detected after 1 character length of idle time. Auto RTS
is used in fast-poll mode only (SW3-1 set to OFF).
SW3-5 − Transmitter Termination
SW3-5 ON = Switched by RTS
OFF = 600 Ω
SW3-5 is used for multi-point configuration networks. When multiple modems are
connected on the same metallic circuit:
The transmitter termination should be of high impedance if the modem is not
transmitting.
The transmitter is only terminated with 600 ohms when RTS is asserted.
This configuration should be used for all slave modems to prevent the transmitting
modem from being unnecessarily burdened. To select this configuration, set SW3-5 ON
on the slave modems.
If you use the modem with transmission lines that are transformer-coupled or with an
impedance-isolated network (such as a transformer bridge), set SW3-5 to OFF for proper
operation.
SW3-6
− Reserved (Test Only)
SW3-6 Must be OFF
SW3-6 must be in the OFF position for normal operation.