Telenetics Flash Poll DSP 9612 User Manual

DSP 9612 Flash Poll Modem

User’s Guide

0049−0117−100 Rev. A

Page iii

Contents

CHAPTER 1 INTRODUCTION........................................................ 5

F

EATURES

.............................................................................................. 6

A

PPLICATIONS

........................................................................................ 7

CHAPTER 2 INSTALLATION ......................................................... 9

U

NPACKING YOUR HARDWARE

.............................................................. 9

A

DDITIONAL ITEMS YOU NEED

.............................................................. 9

H

ARDWARE OVERVIEW

........................................................................ 10

Back View ........................................................................................ 10

Front View....................................................................................... 11

I

NSTALLATION SUMMARY

.................................................................... 12

F

INDING A SUITABLE LOCATION

.......................................................... 12

C

ONFIGURING THE MODEM

.................................................................. 13

SW1 DIP Switch Settings................................................................. 14

SW2 DIP Switch Settings................................................................. 17

SW3 DIP Switch Settings................................................................. 21

C

ONNECTING TO A TRANSMISSION LINE

............................................... 26

C

ONNECTING TO A VOLTAGE SOURCE

.................................................. 27

C

ONNECTING AN

RS-232 D

EVICE

........................................................ 28

LED

S

................................................................................................... 29

L

OOPBACK CONTROL SWITCH

.............................................................. 30

APPENDIX A TROUBLESHOOTING .......................................... 31

P

ROBLEM SOLVING

.............................................................................. 31

APPENDIX B DIP SWITCH SUMMARY ..................................... 33

APPENDIX C SPECIFICATIONS.................................................. 35

G

ENERAL SPECIFICATIONS

................................................................... 35

M

ECHANICAL SPECIFICATIONS

............................................................. 36

I

NTERFACE CONNECTOR PIN ASSIGNMENTS

......................................... 37

RS-232 (DTE) Interface................................................................... 38

E

NVIRONMENTAL SPECIFICATIONS

....................................................... 38

C

OMPLIANCES

...................................................................................... 39

APPENDIX D COMPLIANCES...................................................... 41

APPENDIX E LIMITED PRODUCT WARRANTY .................... 43

APPENDIX F RMA PROCEDURE ................................................ 44

Contents

Page iv

N

OTES

Page 5

Chapter 1

Introduction

ongratulations for purchasing the finest industrial-grade fast­poll modem available.

The Telenetics DSP9612 (Flash Poll) modem is a 9600/4800/0­1800 bps modem designed for 4-wire, full-duplex or 2-wire, half­duplex operation over a voice-band leased line or private line. The
modem is designed utilizing the latest digital-signal processing (DSP)
technology to achieve high performance. The modem employs
Telenetics’ proprietary modulation and encoding scheme to achieve
fast modem training time. The modem is also backward compatible
with Bell 202 and ITU-T V.23 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 describes both the DSP9612FP (AC-powered)
modem and the DSP9612-LV (DC-powered) modem. This manual is
intended 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.

 Packaged in a rugged, compact enclosure for industrial

applications.

 Leased-line interface protected with heavy-duty surge protection

hardware (15KV).

 Requires no 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.

 Operate over voice-band conditioned or unconditioned leased line

and pilot wires.

 Accepts power from a wide range of AC and DC power supplies.

− DSP9612FP: 85 to 265 VAC or 85 to 400 VDC

− DSP9612-LV: 10 to 53 VDC

 Standard industrial connectors for data, analog, and power

interfaces allow reliable interconnection to other industrial
equipment.

 Asynchronous data rates (selectable) of 9600, 4800, and 0-1800

bps.

 Easily accessible DIP switches for user configuration and option

selection.

 DB25 connector for RS-232/V.24 interface.

 Local 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:

 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

Introduction

Page 8

N

OTES

Page 9

Chapter 2

Installation

his chapter describes how to install the modem.

Unpacking Your Hardware

Your package should include:

 At least one of the following DSP9612 modems:

− Model DSP9612FP for 85 to 265 VAC

− Model DSP9612-LV for 10 to 53 VDC

 A leased-line cable

 A shielded DC power cable (model DSP9612-LV modem only)

 This 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:

 Two- or four-wire transmission line or leased line

 A DB25-F data cable for your Data Terminal Equipment (DTE)

port

T

Installation

Page 10

 A power supply that provides either:

− 85 to 265 Volts AC, 50 to 60 Hz, single phase or 85 to

400 VDC (if you have the model DSP9612FP modem), or

− 10 to 53 Volts DC (if you have the model DSP9612-LV

modem)

Hardware Overview

Back View

Figures 2-1 and 2-2 show the back view of the two DSP9612 modem
models. Starting from the left side, these views show:

 A 4-wire/2-wire configuration block. See page 26.

 A female, 25-pin RS-232 connector, for connecting a standard

DTE (RTU). See page 28.

 A POWER ON/OFF switch.

 A power connector. See page 27.

Figure 2-1. Back View of Model DSP9612FP Modem

Hardware Overview

Page 11

Figure 2-2. Back View of Model DSP9612-LV Modem

Front View

The Model DSP9612FP and Model 9612-LV modems have identical
front panels. Figure 2-3 shows the front view of the modem. Starting
from the left side, this view shows:

 A set of nine LEDs. See page 29.

 A loopback test switch. See page 30.

Figure 2-3. 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 13.

3. Connecting to a transmission line. See page 25.

4. Connecting to a voltage source. See page 27.

5. Connecting a DTE device. See page 28.

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 all the LEDs on the front panel.

Note:

Telenetics also offers a rack-mount version of this modem
(Model DSP9612RM) as a plug-in module for the
Telenetics/UDS RM16M Central Site Modem Rack. For more
information, contact Telenetics Corporation’s Sales Department
at [phone].

Configuring the Modem

Page 13

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.

Installation

Page 14

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 low­speed (FSK) modes

Table 2-1. Modem Switch Settings for DIP Switch SW1

Switch SettingsSwitches

ON OFF (Default)

SW1-1 − 1-4: Transmit Level (page 15)

(see Table 2-2 on page 15)

SW1-5: Receiver Dynamic Range
(page 16)

−10 to −43 dBm +3 to −30 dBm

SW1-6: TX Cable Equalizer (page 16) Enabled Disabled

SW1-7: RX Cable Equalizer (page 16) Enabled Disabled

SW1-8: Anti-streaming (page 16) Active Inactive

Configuring the Modem

Page 15

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

Installation

Page 16

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.

Configuring the Modem

Page 17

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 18) V.23 Bell 202

SW2-2: Receiver Squelch (page 18)
(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 19) Disabled Enabled

SW2-4 and SW2-5: FSK RTS-CTS
Delay (page 19)

(see Table 2-4)

SW2-6: FSK CD Delay (page 20) 23ms 6ms

SW2-7: Remote Loopback (page 20) Enabled Disabled

SW2-8: Reserved (Test Only) (page 20) Test Normal

Installation

Page 18

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-

Configuring the Modem

Page 19

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)

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

Installation

Page 20

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.

SW2-7  Remote Loopback

SW2-7 ON = Loopback enabled

OFF = Loopback disabled

During instances of channel noise, the modem may mistaken a received
preamble as a request to go into remote digital loopback. Setting SW2­7 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.

Configuring the Modem

Page 21

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 22) FSK Fast Poll Auto-Rate

SW3-2: Data Rate (page 23) 4800 bps 9600 bps

SW3-3: Async Character (page 23) 11 bits 10 bits

SW3-4: Auto RTS (page 23) Enabled Disabled

SW3-5: Transmitter Termination (page

24)

Switched by RTS

600 Ω

SW3-6: Reserved (Test Only) (page 24) Test Normal

SW3-7: 2- or 4-wire (page 24) 2-wire, half-duplex 4-wire, full-duplex

SW3-8: Carrier Control (page 25) Constant Switched

SW3-9: Rx Termination (page25)

600 Ω

High Rx Impedance

SW3-10: Signal Ground and Earth
Ground Option (page 25)

Connected Separated

Installation

Page 22

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 DRS controls 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 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.

Configuring the Modem

Page 23

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 high­speed fast-poll mode (SW3-1 OFF), setting SW3-2 ON selects 4800
bps, while setting SW3-2 OFF selects 9600 bps.

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 characters, 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).

Installation

Page 24

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 transformer­coupled or with an impedance-isolated network (such as a transformer
bridge), set SW3-5 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.

SW3-7 − 2-/4-Wire Operation

SW3-7 ON = 2-Wire, Half-Duplex Mode

OFF = 4-Wire, Full-Duplex Mode

SW3-7 configures the modem for 4-wire full-duplex or 2-wire half­duplex operation.

Configuring the Modem

Page 25

SW3-8 − Carrier Control

SW3-8 ON = Constant

OFF = Switched

SW3-8 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 (SW3-8 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 (SW3-8 set to OFF), the RTS/CTS delay is
active.

SW3-9 − RX Termination

SW3-9 ON = Enable Rx Termination

OFF = Disable Rx Termination

SW3-9 selects whether RX termination is enabled for a modem. If you
set this switch ON, the receiver is terminated with 600 Ω. If you set
this switch OFF, the receiver is not terminated.

SW3-10 − Grounding Option

SW3-10 ON = Signal Ground and Earth Ground are Connected

OFF = Signal Ground and Earth Ground are Separated

Installation

Page 26

Connecting to a Transmission Line

The modem has a transmission line interface that can be configured for
2- or 4-wire, analog connection, where one pair is used to transmit data
(Tx and Tx) and one pair is used to receive data (Rx and Rx). Table 2-7
shows the pin numbers and corresponding signals for the modem.
Figure 2-4 shows the transmission line interface.

Note:

For communication to occur, the Rx line of one modem
must connect to the Tx line of the other modem. The
modem’s Tx/Rx pair are non-polarized.

Note:

The modem does not support leased-line operations with DC
current.

Table 2-7. Transmission Line Connector Pin Assignments

This Pin Number… Corresponds to This Signal…

1Rx

2Rx

3Tx

4Tx

Connecting to a Voltage Source

Page 27

Figure 2-4. Transmission Line Interface

Connecting to a Voltage Source

The back panel of the modem provides the power interface. For
convenience, the modems can be powered from the following power
sources:

 Model DSP9612FP (AC version): 85 to 265 Volts AC, 50 to 60

Hz, single phase or 85 to 400 VDC

 Model DSP9612-LV (DC version): 10 to 53 Volts DC. The model

DSP9612-LV comes with a shielded power cord for making this
connection.

Figure 2-1 on page 10 shows the connection to the Model
DSP9612FP’s power interface. Figure 2-2 on page 11 shows the
connection to the Model DSP9612-LV’s power interface.

Installation

Page 28

,

WARNING

Before you connect a voltage source, observe the

following power supply voltage guidelines.

Otherwise, you will void your warranty if the wrong

voltage is applied.

 Be sure the voltage source is within the permitted

ranges shown above. Otherwise, your modem and
any attached devices may be damaged.

 Customer-supplied cables must be suitable for the

site environmental conditions.

 Screw terminals on the power interface accept 24 to

16 AWG. However, surge protection is guaranteed
only if the ground wire is greater than 18 AWG and
if there is a solidly earthed ground connection.

 Be sure the power source is not controlled by a wall

switch, which can be inadvertently turned off,
shutting off power to the modem.

Connecting an RS-232 Device

The modem back panel provides a female, 25-pin RS-232 connector
that accepts an attached RS-232 device (see Figure 2-1 on page 10).
This connector accepts a standard connection to a DTE (RTU) that
conforms to the pin assignments shown under “RS-232 (DTE)
Interface” on page 38.

LEDs

Page 29

LEDs

The front panel of the modem provides the LEDs shown in Table 2-8.

Table 2-8. Modem LEDs

LED Color Description

PWR

Green Power Input

RTS

Yellow Request To Send

CTS

Yellow Clear To Send

TD

Yellow Transmit Data

RD

Yellow Receive Data

CD

Yellow Carrier Detect

MR

Yellow Modem Ready

ALB

Red* Analog Loopback

DLB

Red* Digital Loopback

* When the modem is in remote loopback, both the ALB

and DLB LEDs go ON.

Installation

Page 30

Loopback Control Switch

The front panel of the modem has a push button for initiating the
following loopback diagnostic tests:

 Local analog loopback  started by pressing the button one time.

 Local digital loopback  started by pressing the button two times.

 Remote digital loopback  set the local modem’s RTS signal to

low. Then press the remote modem’s diagnostics button three
times and raise the local modem’s RTS signal to start the test. The
ALB and DLB LEDs go ON when the modem is in remote digital
loopback. This test is only available in fast-poll mode only.

Figure 2-4 illustrates these three diagnostics.

Figure 2-4. Loopback Diagnostics

Page 31

Appendix A

Troubleshooting

n the event you encounter a problem using your Telenetics modem,
refer to the troubleshooting information in this appendix.

,

IMPORTANT

If you encounter a problem with your modem, be sure
the switches on the bottom of the modem are set to the
appropriate positions. If a switch is halfway between
an on and off setting, the modem will not operate
properly.

Problem Solving

Table A-1 offers troubleshooting solutions for modem problems.

Table A-1. Troubleshooting Suggestions

If… Perform These Procedures…

Modem does not respond to
the attached DTE and the all
LEDs are off.

Check the power supply input for your
specific model (see page 27).

Modem does not receive data,
and the DCD and RxD LEDs
are off.

The receive line pair may be
disconnected from the modem. Make
sure the transmission line connection
to the modem is accurate and secure.

The receive signal level may be below
the CD threshold. Set SW1-5 ON to
see whether configuring the modem
for a −43 dBm threshold resolves the

I

Troubleshooting

Page 32

Table A-1. Troubleshooting Suggestions

If… Perform These Procedures…

problem.

The RTS, CTS, and TxD
LEDs do not blink.

The attached terminal or DTE may not
be sending data to the modem. Verify
that data is being transmitted. If data is
being transmitted, make sure the RS­232 cable is sound and securely
connected to the modem and terminal
or DTE.

Page 33

Appendix B

DIP Switch Summary

Switch SettingsSwitches

ON OFF (Default)

SW1-1 − 1-4: Transmit Level (page 15)

(see Table 2-2 on page 15)

SW1-5: Receiver Dynamic Range
(page 16)

−10 to −43 dBm +3 to −30 dBm

SW1-6: TX Cable Equalizer (page 16) Enabled Disabled

SW1-7: RX Cable Equalizer (page 16) Enabled Disabled

SW1-8: Anti-streaming (page 16) Active Inactive

SW2-1: FSK Mode (page 18) V.23 Bell 202

SW2-2: Receiver Squelch (page 18)
(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 19) Disabled Enabled

SW2-4 and SW2-5: FSK RTS-CTS
Delay (page 19)

(see Table 2-4)

SW2-6: FSK CD Delay (page 20) 23ms 6ms

SW2-7: Remote Loopback (page 20) Enabled Disabled

SW2-8: Reserved (Test Only) (page 20) Test Normal

DIP Switch Summary

Page 34

Switch SettingsSwitches

ON OFF (Default)

SW3-1: Fast Poll/FSK (page 22) FSK Fast Poll Auto-Rate

SW3-2: Data Rate (page 23) 4800 bps 9600 bps

SW3-3: Async Character (page 23) 11 bits 10 bits

SW3-4: Auto RTS (page 23) Enabled Disabled

SW3-5: Transmitter Termination (page

24)

Switched by RTS

600 Ω

SW3-6: Reserved (Test Only) (page 24) Test Normal

SW3-7: 2- or 4-wire (page 24) 2-wire, half-duplex 4-wire, full-duplex

SW3-8: Carrier Control (page 25) Constant Switched

SW3-9: Rx Termination (page25)

600 Ω

High Rx Impedance

SW3-10: Signal Ground and Earth
Ground Option (page 25)

Connected Separated

Page 35

Appendix C

Specifications

General Specifications

Data rate: 9600, 4800, or 0-1800 bps asynchronous

Data format: 8 or 9 data bits with 1 or more stop bits

DTE interface: EIA RS-232 or V.24 compatible

Line conditions: TELCO Voice band 4- or 2-wire leased line,

conditioned or unconditioned

Private metallic circuits up to 9.5 miles (24
AWG) without cable equalizer. Up to 15.0 miles
(24 AWG) with TX and RX cable equalizer

Operating modes: 2-wire half-duplex or 4-wire full-duplex

Modulation: High-speed fast poll – Telenetics proprietary

FSK, Bell 202T or V.23 compatible

• Mark = 1200 Hz (1300 Hz, V.23)

• Space = 2200 Hz (2100 Hz, V.23)

• Soft Carrier = 900 Hz (Bell 202T only)

Equalizer: Automatic, adaptive

RTS-CTS Delay: 23 ms. (fast poll)

8, 33, 59, or 219 ms (Bell 202)
33 ms (V.23)

Specifications

Page 36

Receiver
dynamic range: 0 to –30 dBm or –10 to –43 dBm

Operating
temperature: -40°C to +85°C

Power supply: Wide range switching power supply:

• DSP9612FP (AC version): 85 to 265Volts
AC, 50/60 Hz, single phase or 85 to 400
VDC

• DSP9612-LV (DC version):10 to 53 Volts
DC

Surge protection: Leased line, up to 15KV

Carrier control: Constant or switched, DIP switch selectable

Carrier loss
recovery: Train on Data

Throughput delay: Less than 10 milliseconds for fast polling.

Auto RTS: Support DTE without hardware RTS

(high speed only)

Anti-Streaming: 27-second timer to prevent transmitter lock-up

network

Mechanical Specifications

Enclosure: Aluminum with removable front and rear panels

Dimensions: 5.70” wide x 8.30” long x 1.50” high

Weight: 1.9 lbs.

Interface connectors

Leased line: 4-position screw terminal.

Data Terminal
Equipment: DB-25 female connector

Interface Connector Pin Assignments

Page 37

Interface Connector Pin Assignments

Leased Line Terminal Block Pin Assignments

This Pin

Number…

Corresponds to

This Signal…

1Rx

2Rx

3Tx

4Tx

Back-to-Back Connection to a Second Modem

Specifications

Page 38

RS-232 (DTE) Interface

Signal Name Modem Input/Output DB25 Pin Description

Earth GND



1 Earth Ground

TXD Input 2 Transmit Data

RXD Output 3 Receive Data

RTS Input 4 Request To Send

CTS Output 5 Clear To Send

DSR Output 6 Data Set Ready

(Modem Ready)

SG



7 Signal Ground

DCD Output 8 Data Carrier

Detected

DRS Input 23 Data Rate Select

Environmental Specifications

Operating temperature: -40 to + 85

o

C

Storage temperature: -40 to +125

o

C

Operating humidity: 5 to 95 %, non-condensing.

Line Isolation: 3750 V RMS

Surge protection: Leased line up to 15K VA

Compliances

Page 39

Compliances

The modem is designed to meet the following agency requirements:

EMI/RFI:

FCC part 15 for Class A computing device

Industry Canada. (Emissions)

Specifications

Page 40

N

OTES

Page 41

Appendix D

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.

Compliances

Page 42

Department of Canada Statement

This Class A digital apparatus meets all requirements of the Canadian
Interference-Causing Equipment Regulations.

Cet appareil numerique de la classe A respecte toutes les exigences du
Reglement sur le materiel brouilleur du Canada.

Page 43

Appendix E

Limited Product

Warranty

Telenetics warrants that the Product sold will be free from defects in material and
workmanship and perform to Telenetics' applicable published specifications for a period of
18 months from the date of delivery to Customer or 12 months from placement into service,
whichever occurs first. The liability of Telenetics hereunder shall be limited to replacing or
repairing, at its option, any defective Products which are returned F.O.B., Telenetics'
facility, Lake Forest, California (or, at Telenetics' option refunding the purchase price of
such products). In no case are Products to be returned without first obtaining permission
and a customer return order number from Telenetics. In no event shall Telenetics be liable
for any consequential or incidental damages.

Products which have been subject to abuse, misuse, accident, alteration, neglect,
unauthorized repair or installation are not covered by the warranty. Telenetics shall make
the final determination as to the existence and cause of any alleged defect. No liability is
assumed for expendable items such as lamps and fuses. No warranty is made with respect
to custom products or Products produced to Customer's specifications except as specifically
stated in writing by Telenetics in the agreement for such custom products.

This warranty is the only warranty made by Telenetics with respect to the goods delivered
hereunder, and may be modified or amended only by a written instrument signed by a duly
authorized officer or Telenetics and accepted by Customer.

This warranty and limitation extends to customer and to users of the product and is in lieu
of all warranties with respect to the product whether express, implied, or statutory,
including without limitation the implied warranties of merchantability and fitness for a
particular purpose.

Page 44

Appendix F

RMA Procedure

Return Merchandise Authorization (RMA) Procedure

Before returning any Telenetics product, an RMA number must be obtained.

Before asking for an RMA number, ascertain that the product was purchased from
Telenetics. If you bought the product from a Distributor or Systems Integrator, the
product should be returned to that vendor.

The most convenient method to obtain an RMA number for a product purchased from
Telenetics is to send an email to [e-mail]. Information required must
include

Your Company Name, address, the actual address that we would use to return the product
to you. Please include any Mail Stop or specific delivery information. The City, State,
and zip code are all required. Your phone and FAX numbers. Your email address.

If the above information is on your letterhead, that format is acceptable.

For each item you wish to return: List the product model number, usually found on the
serial number tag, the serial number for each item you wish to return, a description of the
problem you are encountering, and the cause of the problem (if known).

A product support specialist may call to verify that the product is properly installed or
may ask you to perform tests to insure that the product has actually failed.

After review of the problem, an RMA number will be assigned, you will be notified by
email or FAX.

The product must be properly packed and returned to:

Telenetics
25111 Arctic Ocean
Lake Forest, CA 92630

The RMA number must be legibly displayed on the shipping carton.

No RMA’s will be issued without a product review, Telenetics will not be responsible for
any product returned without an RMA number.

In the near future the RMA form will be available on our Web site
Telenetics.com/support/rma. Fill in all blanks and click on the “Submit” button.

If you think the product may be out of warranty, include a method of payment for repairs,
either a Purchase Order number, or Credit card number, Card Holder Name, Date of
Expiration on the RMA request. Repairs currently require 5 – 10 working days, and are
returned UPS second day air.

RMA Procedure

Page 45