DSP DSP 9612 User manual

DSP 9612 Flash Poll Modem
User’s Guide
0049−0117−000 Rev. B

Page iii
Contents
CHAPTER 1 INTRODUCTION
................................
.........................
5
FEATURES
................................
................................
................................
6
APPLICATIONS
................................
................................
.........................
7
CHAPTER 2 INSTALLATION
................................
..........................
9
UNPACKING YOUR HARDWARE
................................
...............................
9
ADDITIONAL ITEMS YOU NEED
................................
...............................
9
HARDWARE OVERVIEW
................................
................................
.........
10
Back View
................................
................................
..........................
10
Front View
................................
................................
........................
11
INSTALLATION SUMMARY
................................
................................
.....
12
FINDING A SUITABLE LOCATION
................................
...........................
12
CONFIGURING THE MODEM
................................
................................
...
12
High-Speed (Fast Poll) Mode
................................
...........................
13
Low-Speed (FSK) Mode
................................
................................
....
18
CONNECTING TO A TRANSMISSION LINE
................................
...............
23
CONNECTING TO A VOLTAGE SOURCE
................................
...................
25
CONNECTING AN RS-232 DEVICE
................................
.........................
26
LEDS
................................
................................
................................
.....
26
LOOPBACK CONTROL SWITCH
................................
...............................
27
APPENDIX A TROUBLESHOOTING
................................
............
29
PROBLEM SOLVING
................................
................................
................
29
APPENDIX B SPECIFICATIONS
................................
...................
31
GENERAL SPECIFICATIONS
................................
................................
....
31
MECHANICAL SPECIFICATIONS
................................
..............................
32
INTERFACE CONNECTOR PIN ASSIGNMENTS
................................
..........
33
RS-232 (RTU) Interface
................................
................................
....
34
ENVIRONMENTAL SPECIFICATIONS
................................
........................
34
COMPLIANCES
................................
................................
.......................
35
APPENDIX C COMPLIANCES
................................
.......................
37
APPENDIX D LIMITED PRODUCT WARRANTY
.....................
39
APPENDIX E RMA PROCEDURE
................................
.................
41

Contents
Page iv
NOTES

Page 5
Chapter 1
Introduction
ongratulations for purchasing the finest industrial-grade fast-
poll modem available.
The DSP9612 (Flash Poll) modem is a 9600/4800/0-
1800 bps 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 proprietary
modulation and encoding scheme to achieve fast modem training time.
The modem is also backward compatible with Bell 202 modems.
The DSP9612 modem is ideally suited for multi-point communication
systems that require fast response time, short training time, and low
throughput delay. The DSP9612 is the most technologically advanced
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 configure and install your modem. It also contains
troubleshooting information in the unlikely event you encounter a
problem with your modem.
C

Introduction
Page 6
Features
The DSP9612 modem is specifically designed for harsh environments
found in utility substations and industrial facilities. Though
functionally similar to commercial modems, the DSP9612 provides the
following unique features that make it well suited for utility and
industrial applications.
cPackaged in a rugged, compact enclosure for industrial
applications.
cLeased-line interface protected with heavy-duty surge protection
hardware (15KV).
cRequires no human intervention, making it ideal for unmanned
locations.
cWorks within an extended temperature range of -40ºC to +85ºC.
cDesigned with coupling transformers for high-voltage isolation
and common mode noise rejection in industrial and commercial
environments.
cOperate over voice-band conditioned or unconditioned leased line
and pilot wires.
cAccepts power from a wide range of AC and DC power supplies.
cStandard industrial connectors for data, analog, and power
interfaces allow reliable interconnection to other industrial
equipment.
cAsynchronous data rates (selectable) of 9600, 4800, and 0-1800
bps.
cEasily accessible DIP switches for user configuration and option
selection.
cDB25 connector for RS-232/V.24 interface.
cLocal analog, local digital, and remote digital loopback
diagnostics.

Applications
Page 7
Applications
The DSP9612 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
There are a number of factors that can affect the network’s and
modem’s operation and performance. These include:
cOperating speed
c2-wire or 4-wire configuration
cTransmission line characteristics, noise, and line impairments
cNetwork configuration (point-to-point or multipoint)
cNumber of nodes on the network

Introduction
Page 8
NOTES

Page 9
Chapter 2
Installation
his chapter describes how to install the modem.
Unpacking Your Hardware
Your package should include:
cAt least one DSP9612FP modem
cA leased-line cable
cThis User’s Guide
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:
cTwo- or four-wire transmission line or leased line
cA power supply that provides either:
−85 to 265 Volts AC, 50 to 60 Hz, single phase (AC
version), or
−10 to 53 Volts DC (DC version)
T

Installation
Page 10
Hardware Overview
Back View
Figure 2-1 shows the back view of the DSP9612FP modem. Starting
from the left side, this view shows:
cA 4-wire/2-wire configuration block. See page 23.
cA female, 25-pin RS-232 connector, for connecting a standard
DTE (RTU). See page 26.
cA POWER ON/OFF switch.
cA power connector. See page 25.
Figure 2-1. Back View of Modem
B
B
a
a
c
c
k
k
V
V
i
e
e
w
w
Power Source
Power Switch
DTE Connection
Leased Line

Hardware Overview
Page 11
Front View
Figure 2-2 shows the front view of the modem. Starting from the left
side, this view shows:
cA set of nine LEDs. See page 26.
cA loopback test switch. See page 27.
Figure 2-2. Front View of Modem

Installation
Page 12
Installation Summary
The modem installation involves the following steps:
1. Finding a suitable location for the modem. See the section below.
2. Configuring the modem. See page 12.
3. Connecting to a transmission line. See page 18.
4. Connecting to a voltage source. See page 25.
5. Connecting a DTE device. See page 26.
Finding a Suitable Location
The location you select should provide easy access to the back panel
communications interface(s) and front panel power interface. It should
also let you view the red LED on the front panel.
Configuring the Modem
You configure the modem using the two sets of DIP switches on the
bottom of the modem front panel. The switches can have one of two
functions, depending on how switch SW2-1 is set.
cSetting switch SW2-1 to OFF configures the modem for high-
speed (Fast Poll) mode. In this mode, the switches correspond to
the functions in Table 2-1 (see page 13).
cSetting switch SW2-1 to ON configures the modem for low-speed
(FSK) mode. In this mode, the switches correspond to the
functions in Table 2-3 (see page 18).

Configuring the Modem
Page 13
High-Speed (Fast Poll) Mode
Table 2-1 shows the modem switch settings that can be used when the
modem is configured for high-speed (Fast Poll) mode. This mode is
enabled when switch SW2-1 is set to OFF. Following this table is an
explanation of these settings.
Table 2-1. Modem Switch Settings for High-Speed Mode
Switch SettingsSwitches
ON OFF (Default)
SW 1-1 −1-4: Transmit Level (page 14)
(see Table 2-2 on page 14)
SW 1-5: Receiver Dynamic Range
(page 15)
−10 to −43 dBm +3 to −30 dBm
SW 1-6: TX Cable Equalizer (page 15) Enabled Disabled
SW 1-7: RX Cable Equalizer (page 15) Enabled Disabled
SW 1-8: Anti-streaming (page 15) Active Inactive
SW 2-1: High-Speed/Low-Speed Mode
(page 16)
Low-Speed Mode
(FSK)
High-Speed Mode
(Fast Poll)
SW 2-2: Data Rate in Fast Poll Mode 4800 bps 9600 bps
SW 2-3: Async Character 11 bits 10 bits
SW 2-4: Auto RTS (page 16) Enabled Disabled
SW2-5: Reserved
SW 2-6: Production Test Only (page 16)
Test Normal
SW 2-7: 2- or 4-wire (page 16) 2-wire, half-
duplex
4-wire, full-duplex
SW 2-8: Carrier Control (page 17) Constant Switched
SW 2-9: Rx Termination (page17) Disabled Enabled
SW 2-10: Ground Options Connected Disconnected

Installation
Page 14
SW1-1 through SW1-4 −Transmit Level (high- & low-speed modes)
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 (High-Speed and Low-Speed Modes)
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

Configuring the Modem
Page 15
SW1-5 −Receiver Dynamic Range (high- & low-speed modes)
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 (high-speed 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 high-speed
mode (SW2-1 set to OFF).
SW1-8 −Anti-streaming (high- & low-speed modes)
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.

Installation
Page 16
SW2-1 −Fast Poll/FSK (high- & low-speed modes)
SW2-1 ON = Low-Speed Mode (FSK)
OFF = High-Speed Mode (Fast Poll)
SW2-1 configures the modem for either low-speed (FSK) mode or
high-speed (Fast Poll) mode. As a result, the SW2-1 setting you choose
determines the switch definitions for the other switches.
cFor high-speed mode, the configuration switches follow the
definitions in Table 2-1.
cFor low-speed mode, the configuration switches follow the
definitions in Table 2-3.
SW2-4 −Auto RTS (high-speed mode only)
SW2-4 ON = Enable Auto RTS
OFF = Disable Auto RTS
For data terminals that do not support hardware RTS, set SW2-4 to ON
to enable buffer mode. In this mode, TXD is detected at the modem and
internal RTS 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.
SW2-6 −Production Test Only (high- & low-speed modes)
SW2-6 Must be OFF
SW2-6 must be in the OFF position for normal operation.
SW2-7 −2-/4-Wire Operation (high- & low-speed modes)
SW2-7 ON = 2-Wire, Half-Duplex Mode
OFF = 4-Wire, Full-Duplex Mode
SW2-7 configures the modem for 4-wire full-duplex or 2-wire half-
duplex operation.

Configuring the Modem
Page 17
SW2-8 −Carrier Control (high- & low-speed modes)
SW2-8 ON = Constant
OFF = Switched
SW2-8 selects either constant or switched carrier. Constant carrier
allows DTEs, such as asynchronous dumb terminals or RTUs, to
operate with modems, without the input RTS signal. When constant
carrier mode is enabled (SW2-8 set to ON), the modem forces the
transmit carrier active and the RTS-CTS delay is minimum (<0.5 ms.).
You can use constant carrier in 4-wire, point-to-point or multi-point
applications (from master to slave modems).
In switched-carrier mode (SW2-8 set to OFF), the RTS/CTS delay is
23 ms.
SW 2-9 −RX Termination (high- & low-speed modes)
SW2-9 ON = Disable Rx Termination
OFF = Enable Rx termination
SW2-9 selects whether RX termination is enabled for a modem. If you
set this switch OFF, the receiver is terminated with 600 Ω. If you set
this switch ON, the receiver is not terminated.

Installation
Page 18
Low-Speed (FSK) Mode
Table 2-3 shows the modem switch settings that can be used when the
modem configured for low-speed (FSK) mode. This mode is enabled
when switch SW2-1 is set to ON. Following this table is an explanation
of these settings.
Table 2-3. Modem Switch Settings for Low-Speed Mode
Switch SettingsSwitches
ON OFF
SW 1-1 −1-4: Transmit Level
(page 19)
(see Table 2-4 page 19)
SW 1-5: Receiver Dynamic Range
(page 20)
−10 to −43 dBm +3 to −30 dBm
SW 1-6 −SW1-7: RTS-CTS Delay
(page 20)
(see Table 2-5 page 20)
SW 1-8: Anti-streaming (page 20) Active Inactive
SW 2-1: High-Speed)/Low-Speed
Mode (page 21)
Low-Speed
(FSK) Mode
High-Speed
(Fast Poll) Mode
SW 2-2: CD Delay (page 21) 23 ms. 6 ms.
SW 2-3: Turnaround SQ (page 21) 0 ms. 8 ms.
SW 2-4: Not Used 
SW2-5: Soft Carrier (page 22) Disabled Enabled
SW 2-6: Production Test Only
(page 22)
Test Normal
SW 2-7: 2- or 4-wire (page 22) 2-wire 4-wire
SW 2-8: Carrier Control (page 22) Constant Switched
SW 2-9: Rx Termination (page23) Disabled Enabled
SW 2-10: Ground Options Connected Disconnected

Configuring the Modem
Page 19
SW1-1 through SW1-4 −Transmit Level (high- & low-speed modes)
Switches SW1-1 through SW1-4 adjust the modem’s transmit level.
Table 2-4 shows the transmit levels you can select using these
switches.
Table 2-4. Transmit Levels (High-Speed and Low-Speed Modes)
SW1-1 through SW1-4 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

Installation
Page 20
SW1-5 −Receiver Dynamic Range (high- & low-speed modes)
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 −RTS-CTS Delay (low-speed mode only)
Switches SW1-6 and SW1-7 determine the duration of the RTS-CTS
delay. Table 2-5 shows the RTS-CTS delays you can select using these
switches.
Table 2-5. RTS-CTS Delays
SW1-6 and SW1-7 Switch Settings
RTS-CTS Delay SW1-6 SW1-7
8 ms. delay OFF OFF
33 ms. Delay OFF ON
59 ms. Delay ON OFF
219 ms. delay ON ON
SW1-8 −Anti-streaming (high- & low-speed modes)
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.

Configuring the Modem
Page 21
SW2-1 −Fast Poll/FSK (high- & low-speed modes)
SW2-1 ON = Low-Speed Mode (FSK)
OFF = High-Speed Mode (Fast Poll)
SW2-1 configures the modem for either low-speed (FSK) mode or
high-speed (Fast Poll) mode. As a result, the SW2-1 setting you choose
determines the switch definitions for the other switches.
cFor high-speed mode, the configuration switches follow the
definitions in Table 2-1.
cFor low-speed mode, the configuration switches follow the
definitions in Table 2-3.
SW2-2 −CD Delay (low-speed mode only)
SW2-2 ON = 23 milliseconds
OFF = 6 milliseconds
SW2-2 controls the Carrier Detect (CD) delay and is valid for low-
speed mode only. Setting this switch to 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.
SW2-3 −Turnaround Squelch Delay (low-speed mode only)
SW2-3 ON = 0 milliseconds
OFF = 8 milliseconds
SW2-3 controls the turnaround squelch delay and is valid for low-
speed mode only. Setting this switch to ON 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 mode (SW2-7 set to ON), the modem squelches
the receiver for 8 milliseconds after RTS is turned off to prevent far-
end echoes from causing data errors.