WDS P20 Installation And Operation Manual

WDS P20

Redundant T ransceiver

Chassis

Installation and Operation Guide

QUICK START GUIDE

Below are the basic steps for configuring a Redundant Station using the WDS P20 Redundant Transceiver
Chassis. Detailed instructions are given in “INSTALLATION” on page 9.

1. Install transceivers

• Remove chassis cover.

• Remove mounting plate.

• Mount transceivers to plate.

2. Connect internal back-up battery (if so equipped) and replace chassis cover.

3. Connect wiring

• Connect to ground, connect antenna(s), connect to data interf ace, connect to po wer , and connect an y
alarms. Connections are described in “Connecting Wiring” on page 12.

4. Program transceivers

• Plug in HHT to Transceiver A.

• Set Front Panel Radio Selection switch to A.

• Enter

• Repeat for Transceiver B.

• Record all parameters on a label and affix the label to the chassis.

5. Configure for repeater operation if desired.

• See the instructions beginning with “Configuring the Redundant Transceiver Chassis as a Repeater”

INIT xx20

for Redundant Station operation.

on page 16.

(if not shipped installed)

(where xx is the first two digits of transceiver model number) to configure transceiver

6. Apply primary power

7. Select the active transceiver

• Set the front panel
ceiver B, no auto switchover),or AUTO (automatic switchover).

8. Verify proper operation

• Observe LEDs on rear panel.

• Refer to Table 3 or Table 4 on page 20 for a description of the status LEDs.

• Refine directional antenna headings f or maximum receiv ed signal strength using the RSSI command.
Remotes must be synchronized with the master station for use of this command.

RADIO SELECTION

Switch to A (Transceiver A, no auto switchover),

B (Trans-

TABLE OF CONTENTS

1.0 ABOUT THIS MANUAL ...............................................................1

2.0 ABOUT THE P-20........................................................................1

2.1 Features ...........................................................................................2

2.2 Chassis Configurations ....................................................................2

2.3 Antenna Port Configurations ............................................................ 3

2.4 Model Configuration Codes ..............................................................3

2.5 Replacement Parts ...........................................................................4

3.0 GLOSSARY OF TERMS..............................................................4

4.0 INSTALLATION PLANNING.........................................................7

4.1 Redundant Transceiver Chassis Used as Master Station ................7

4.2 Redundant Transceiver Chassis Used as Remote Station ...............8

4.3 Redundant Transceiver Chassis Used as a Repeater ......................8

5.0 INSTALLATION............................................................................9

5.1 Redundant Transceiver Chassis Shipment ....................................10

5.2 Installation Overview ......................................................................10

5.3 Installing Transceivers ....................................................................11

5.4 Connecting Wiring ..........................................................................12

5.5 Programming the Transceivers .......................................................14

5.6 Configuring the Redundant Transceiver Chassis as a Repeater ....16

5.7 Mounting the Redundant Transceiver Chassis ...............................17

6.0 INITIAL START-UP.....................................................................18

7.0 TROUBLESHOOTING...............................................................21

8.0 TECHNICAL REFERENCE.......................................................21

8.1 Replacing Power Supply Modules ..................................................21

8.2 Replacing Other Assemblies ..........................................................21

Copyright Notice

This Installation and Operation Guide and all software described herein
are protected by copyright: Shenzhen Sinsoun Inc,

Wireless Data Systems reserves its right to correct any errors and
omissions.

i

All rights reserved.

RF Exposure

Operational Safety Notices

The radio equipment described in this guide emits radio frequency
energy. Although the power level is low, the concentrated energy from
a directional antenna may pose a health hazard. When using a gain
antenna of 8 dBi (350-512 MHz) or 12 dBi (800-960 MHz), do not allow
people to come closer than 0.5 meters to the front of the antenna when
the transmitter is operating. Using higher gain antennas would mean
increasing this distance accordingly.

This manual is intended to guide a professional installer to install,
operate and perform basic system maintenance on the described radio.

ISO 9001 Registration

Wireless Data Systems' adheres to this internationally accepted quality system
standard.

WDS Quality Policy Statement

We, the employees of Wireless Data Systems, are committed to
achieving total customer satisfaction in everything we do.

Total Customer Satisfaction in:

• Conception, design, manufacture and marketing of our products.

• Services and support we provide to our internal and external cus­tomers.

Total Customer Satisfaction Achieved Through:

• Processes that are well documented and minimize variations.

• Partnering with suppliers who are committed to providing quality
and service.

• Measuring our performance against customer expectations and
industry leaders.

• Commitment to continuous improvement and employee involve­ment.

Notice

While every reasonable effort has been made to ensure the accuracy of
this manual, product improvements may result in minor differences
between the manual and the product shipped to you. If you have addi­tional questions or need an exact specification for a product, please con­tact our Customer Service Team using the information at the back of this
guide. In addition, manual updates can often be found on the WDS web
site at

www.sinosun.cn.

.

ii

1.0 ABOUT THIS MANUAL

This guide describes:

• Installation planning for a P20 Redundant Transceiver Chassis

• Instructions for installing transceivers in a Redundant Trans-

ceiver Chassis

• Instructions for installing a Redundant Transceiver Chassis, and
optionally configuring it as a repeater in a repeater-assisted sys­tem

• Initial start-up of a Redundant Transceiver Chassis.

Procedures for programming and troubleshooting the internal trans­ceivers are contained in the Installation and Operation Manual supplied
with the transceivers.

Once the unit has been properly installed, configured and started up,
operation of the P20 Redundant Transceiver Chassis is completely
automatic. Operator actions are limited to observing the rear LED status
indicators for proper operation, and selecting A and B transceivers.

Following installation, we suggest keeping this guide near the equip­ment for future reference.

2.0ABOUT THE P20

The P20 Redundant Transceiver Chassis (Figure 1) is a tabletop or
rack-mount unit designed to hold two WDS transceivers, two power
supplies, and a switchover logic board that automatically selects
between transceiver A or B as the active transceiver. (Manual selection
can also be made using a front panel switch.) Within a radio system, this
setup is called a Redundant Station.

Invisible place holder

1

Figure 1. P20 Redundant Transceiver Chassis

This duplication of functionality means the unit will continue to transmit
data even if a failure occurs in one of the transceivers or power supplies.
This capability is important in many applications where uninterrupted
service is required.

In addition to transmitting error codes to a main station, the Redundant
Transceiver Chassis is equipped with alarm connections on the rear
panel which activate when one of the transceivers reports an alarm con­dition. These are “dry” alarm contacts that allow the connection of cus­tomer-supplied alarm equipment such as a lamp or sounding device.

The following WDS transceivers can be used with the Redundant Trans­ceiver Chassis:

• WDS 4710

• WDS 9710

• WDS 9810

• WDS 24810

When these transceivers are ordered installed in a P20 chassis, the last
two digits of the model number change to 20. For example, when the
WDS 4710 is installed in a P20 chassis, the combination is referred to
as an WDS 4720.

Other WDS transceivers may be compatible with the Redundant Trans­ceiver Chassis. Contact WDS if you are unsure.

2.1 Features

The Redundant Transceiver Chassis provides:

• Fully redundant capability—Standard chassis contains two
transceivers and two power supplies. Provision for optional
redundant antenna port.

• Automatic switchover to alternate transceiver if a failure occurs

• Optional built-in battery backup for AC-powered units

• Rear panel alarm connections for customer-supplied alarm

equipment

• Tabletop or 19 inch rack-mount installation

• Uses standard WDS transceivers inside

• Rear panel diagnostics connection for each transceiver

2.2 Chassis Configurations

The Redundant Transceiver Chassis can be ordered with or without
installed transceivers to meet customer requirements:

2

1.

No transceivers installed. This configuration allows customers to
install two existing transceivers in the empty chassis to create a
Redundant Station.

2.

One transceiver installed.

Similarly, this configuration allows cus­tomers to install an existing transceiver to create a Redundant Sta­tion.

3.

Two transceivers installed.

This configuration provides an immedi-
ately usable Redundant Station for new customers, or for existing
customers who wish to add a Redundant Station without installing
existing transceivers.

2.3 Antenna Port Configurations

The Redundant Transceiver Chassis can be configured with a single
antenna, or with two antennas for continued operation if the primary
antenna becomes damaged or is otherwise inoperative.

1.

Single antenna port. The port is automatically connected to the

active transceiver by an internal relay.

2. Two antenna ports. Each port is connected to one of the transceivers
and to separate station antennas.

2.4 Model Configuration Codes

The configuration details of the Redundant Transceiver Chassis (as
shipped from the factory) can be quickly determined from the model
number label attached to the outside of the chassis. Figure 2 shows the
significance of the model number characters printed on the label.

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PACKAGE

1 - 12V DC
2 - 24 V DC

3 - 48V DC
4 - 125V DC
A - 115/230V AC w/battery
B - 115/230V AC w/o battery

ANTENNA PORTS

3

P20P20

Figure 2. P20 model configuration codes

2.5 Replacement Parts

Table 1 lists parts available to replace Redundant Transceiver Chassis
components should they fail.

Table 1. Replacement part numbers

Power Supply

Switchover Logic Board
Battery Control Board
Indicator Board
Backup Battery

03-1143A12 115/230 VAC
03-2613A02 18-36 VDC
03-2613A03 36-75 VDC
03-2613A04 10.5-16 VDC
03-3306A01
03-3362A01
03-3307A01
28-1575A03

3.0 GLOSSARY OF TERMS

If you are new to radio, some of the terms used in this guide may be
unfamiliar. The following glossary explains many of these terms and
will prove helpful in understanding the operation of the transceiver.

Antenna System Gain —A figure, normally expressed in dB, repre­senting the power increase resulting from the use of a gain-type antenna.
System losses (from the feedline and coaxial connectors, for example)
are subtracted from this figure to calculate the total antenna system gain.

Bit —The smallest unit of digital data, often represented by a one or a
zero. Eight bits (plus start, stop, and parity bits) usually comprise a byte.

Bits-per-second —See BPS .
BPS —Bits-per-second. A measure of the information transfer rate of

digital data across a communication channel.
Byte —A string of digital data usually made up of eight data bits and

start, stop and parity bits.
Decibel (dB) —A measure of the ratio between two signal levels. Fre-

quently used to express the gain (or loss) of a system.

Data Circuit-terminating Equipment —See DCE .
Data Communications Equipment —See DCE .
Data Terminal Equipment —See DTE .
dBi —Decibels referenced to an “ideal” isotropic radiator in free space.

Frequently used to express antenna gain.

4

dBm —Decibels referenced to one milliwatt. An absolute unit used to
measure signal power, as in transmitter power output, or received signal
strength.

DCE —Data Circuit-terminating Equipment (or Data Communications
Equipment). In data communications terminology, this is the “modem”
side of a computer-to-modem connection. WDS 9810/9820 and 24810
transceivers are DCE devices.

Digital Signal Processing —See DSP .

DSP —Digital Signal Processing. In WDS series xx10 and xx20 trans-

ceivers, the DSP circuitry is responsible for the most critical real-time
tasks; primarily modulation, demodulation, and servicing of the data
port.

DTE —Data Terminal Equipment. A device that provides data in the
form of digital signals at its output. Connects to the DCE device.

Equalization —The process of reducing the effects of amplitude, fre­quency or phase distortion with compensating networks.

Fade Margin —The greatest tolerable reduction in average received
signal strength that will be anticipated under most conditions. Provides
an allowance for reduced signal strength due to multipath, slight antenna
movement or changing atmospheric losses. A fade margin of 20 to 30
dB is usually sufficient in most systems.

Frame —A segment of data that adheres to a specific data protocol and
contains definite start and end points. It provides a method of synchro­nizing transmissions.

Hardware Flow Control —A transceiver feature used to prevent data
buffer overruns when handling high-speed data from the RTU or PLC.
When the buffer approaches overflow, the radio drops the clear-to-send
(CTS) line, which instructs the RTU or PLC to delay further transmis­sion until CTS again returns to the high state.

Host Computer —The computer installed at the master station site,
which controls the collection of data from one or more remote sites.

Latency —The delay (usually expressed in milliseconds) between when
data is applied to TXD (Pin 2) at one radio, until it appears at RXD
(Pin 3) at the other radio.

MAS

master station communicates with several remote stations for the pur­pose of gathering telemetry data.

5

—Multiple Address System. A radio system where a central

MCU

—Microcontroller Unit. This is the processor responsible for con­trolling system start-up, synthesizer loading, hop timing, and key-up
control.

Microcontroller Unit
Multiple Address System (MAS)
Point-Multipoint System

—See

MCU

.
—See

Point-Multipoint System.

—A radio communications network or
system designed with a central control station that exchanges data with
a number of remote locations equipped with terminal equipment.

Poll

—A request for data issued from the host computer (or master PLC)

to a remote radio.

PLC

—Programmable Logic Controller. A dedicated microprocessor
configured for a specific application with discrete inputs and outputs. It
can serve as a host or as an RTU.

Programmable Logic Controller

—See

PLC

.

Remote (Station)—A radio in an MAS network that communicates
with an associated master station.

Remote Terminal Unit—See RTU.
Redundant Operation—A station arrangement where two transceivers

and two power supplies are available for operation, with automatic
switchover in case of a failure.

RTU—Remote Terminal Unit. A data collection device installed at a
remote radio site.

SCADA—Supervisory Control And Data Acquisition. An overall term
for the functions commonly provided through an MAS radio system.

Standing Wave Ratio—See SWR.
Supervisory Control And Data Acquisition—See SCADA.
SWR—Standing Wave Ratio. A parameter related to the ratio between

forward transmitter power and the reflected power from the antenna
system. As a general guideline, reflected power should not exceed 10%
of the forward power (≈ 2:1 SWR).

6

4.0 INSTALLATION PLANNING

Advice for planning a complete radio system, including site and antenna
selection, can be found in the Installation and Operation Manual sup­plied with your transceivers. This section covers planning for the instal­lation of an individual Redundant Transceiver Chassis, and for
configuring a Redundant Transceiver Chassis for use as a repeater.
(Individual transceivers may also be used as repeaters, and this informa­tion is covered in the transceiver’s Installation and Operation Manual.)

A Redundant Transceiver Chassis (Section 4.1) is typically used at a
master station to ensure uninterrupted receipt of data from remote
radios. Although a single transceiver is most commonly used at remote
sites (Section 4.2), a Redundant Transceiver Chassis may be used for
increased reliability.

Redundant Transceiver Chassis may also be used as repeaters in a
repeater-assisted system (Section 4.3). A repeater re-transmits data
between systems, overcoming the range limitations of individual radios.

4.1 Redundant Transceiver Chassis Used as

Master Station

Figure 3 shows a typical master station arrangement using a Redundant
Transceiver Chassis.

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ANTENNA SYSTEM

(OMNIDIRECTIONAL TYPE
NORMALLY USED)

HOST
SYSTEM

P20 REDUNDANT

MASTER RADIO

TO DATA I/O

INTERFACE CONN.

TO ANTENNA
CONNECTOR

PRIMARY
POWER CORD(S)

LOW-LOSS
FEEDLINE

Figure 3. Redundant Station used as master station

7

4.2 Redundant Transceiver Chassis Used as

Remote Station

Figure 4 shows a Redundant Transceiver Chassis used as a remote sta­tion.

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ANTENNA SYSTEM

(DIRECTIONAL TYPE
NORMALLY USED)

TO DATA I/O

INTERFACE CONN.

REMOTE

TERMINAL

UNIT (RTU)

TO PRIMARY ANTENNA

CONNECTOR

P-20 REDUNDANT

REMOTE RADIO

POWER CORD(S)

LOW-LOSS
FEEDLINE

Figure 4. Redundant Station used as remote station

4.3 Redundant Transceiver Chassis Used as a

Repeater

Two WDS redundant transceivers may be connected “back-to-back”
using a null-modem cable to form a repeater station (Figure 5). This is
sometimes required in a network that includes a distant remote station
that would otherwise be unable to communicate with the master station
due to distance, or terrain.

NOTE: WDS 9810 radios may be operated as repeaters. If other trans-

ceivers are installed, contact WDS for additional information
for operational consideration.

8

POINT-TO-POINT

LINK

REPEATER LINK

NULL-MODEM CABLE

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REMOTE

RADIO

RTU

XX10 OR P-20

POLLING MASTER

RADIO

P-20 RADIO

HOST

COMPUTER

REMOTE

RADIO

P-20 RADIO

RTU

RTU

REMOTE

RADIO

Figure 5. Repeater system configuration using

a Redundant Station

A repeater works by re-transmitting data from the outlying remote site
to the master station and vice versa. The repeater introduces a small
amount of end-to-end transmission delay, but this is not a problem in
most systems.

The geographic location of a repeater station is especially important. A
site must be chosen that allows good communication with both the
master and the outlying remote site. This is often on top of a hill, or other
elevated terrain from which both sites can be “seen” by the repeater sta­tion antennas. A detailed discussion on the effects of terrain is given in
the transceiver’s Installation and Operation Manual.

5.0 INSTALLATION

This section presents installation steps for:

9

• Installing transceiver(s) in a Redundant Transceiver Chassis.

Use these steps to install an existing MDS transceiver into the
Redundant Transceiver Chassis.

• Installing the Redundant Transceiver Chassis. Use these

steps to connect wiring and program the transceivers in the
Redundant Transceiver Chassis at the master or remote loca­tion.

• Configuring the Redundant Transceiver Chassis as a
repeater in a repeater-assisted system (optional).

• Optimizing radio performance.

In most cases, these steps alone will be sufficient to complete the instal­lation. Should further information be required, contact Wireless Data
Systems at the number given on the inside back cover of this manual.

5.1 Redundant Transceiver Chassis Shipment

Figure 6 shows the contents of a typical Redundant Transceiver Chassis
shipment.

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REDUNDANT STATION

POWER CORD(S)
(AC cord shown)

INSTALLATION &
OPERATION GUIDE

Figure 6. P20 Redundant Transceiver Chassis typical shipment

5.2 Installation Overview

NOTE: The internal back-up battery (if equipped) is disconnected for

shipment. It is important to remove the P20 top cover and
connect the battery to the battery control board for the battery
back-up to function. Refer to Figure 7.

10

Installation consists of these steps:

• Installing transceivers in the Redundant Transceiver Chassis, if
the chassis was ordered without pre-installed transceivers

• Connecting the internal back-up battery

• Connecting wiring for ground, antenna, data interface, power,

and any alarms

• Programming the transceivers for operation using the
Hand-Held Terminal (HHT)

• Configuring the Redundant Transceiver Chassis for use as a
repeater (optional)

• Optimizing transceiver performance.

5.3 Installing Transceivers

The modular construction of the Redundant Transceiver Chassis
(Figure 7) makes it easy to install transceivers. The only tool required is
a Phillips screwdriver.

1. Make sure there is no power applied to the unit.

CAUTION

POSSIBLE

EQUIPMENT

DAMAGE

2. Remove the top cover of the Redundant Transceiver Chassis by
loosening the two screws at the rear panel.

3. If a backup battery is installed in the chassis, be sure it is discon­nected from the battery control board.

4. Remove the transceiver mounting plate from the chassis (remove the
two screws near the front of the plate).

5. Using 4 6-32 x 5/16 screws for each transceiver, mount the trans­ceiver(s) to the plate. The mounting screws must extend through the
bottom of the plate into the transceiver case.

Do not use screws longer than 5/16 inch, or damage to the transceiv er’s
PC board will occur. If you do not have the right hardware, contact
MDS.

6. Re-install the transceiver mounting plate to the chassis.

7. Connect and secure the interface, power and diagnostics cables to
the transceiver(s).

8. Connect the battery cable to the battery control board.

9. Re-install the top cover of the Redundant Transceiver Chassis.

11

This completes the installation of transceivers in the Redundant Trans­ceiver Chassis. Next, make the connections between the Redundant
Transceiver Chassis and ground, antenna, data interface, power, and any
alarms.

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TRANSCEIVER

A

SWITCHOVER
LOGIC BOARD

(03-3306A01)

Figure 7. P20 Redundant Transceiver Chassis, internal view

TRANSCEIVER

B

POWER SUPPLY A

(03-1143A12)

POWER SUPPLY B

(03-1143A12)

BACKUP BATTERY

28-1575A03

BATTERY CONTROL

BOARD (03-3362A01)

INDICATOR BOARD (Hidden)

(03-3307A01)

5.4 Connecting Wiring

Follow these steps to connect the Redundant Transceiver Chassis with
ground, antenna and feedline, data interface cable, primary power, and
any alarms.

Figure 8 shows a rear view of the Redundant Transceiver Chassis. Refer
to this illustration when making the rear panel wiring connections
described in Steps 2 through 6.

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POWER
ON/OFF

POWER SUPPLY

POWER

INPUT

DIAGNOSTICS (B)

LED VIEWING

SLOT

DATA I/O

INTERFACE

GROUND

CONNECTION

ANTENNA

PORT (A/B)

DIAGNOSTICS (A)

LED VIEWING

SLOT

ALARM

CONNECTIONS

REDUNDANT

ANTENNA

PORT

(OPTIONAL)

12

Figure 8. Rear panel of Redundant Transceiver Chassis

1. Grounding the Redundant Transceiver Chassis. Connect the rear
panel ground stud to the chassis’ earth grounding system.

2. Installing the antenna. Install the station antenna(s) and feed­line(s). If a directional antenna is used, preset its heading in the
desired direction.

3. Connecting to the data equipment. Connect the data equipment to
the chassis’

DATA INTERFACE

connector.

Use only the required pins for the application. Do not use a fully
pinned (25 conductor) cable. Typical applications require the use of
Pin 2 (transmit data—TXD), Pin 3 (received data—RXD) and Pin 7
(signal ground). Refer to Figure 9 for a detailed view of the

INTERFACE

connector.

DATA

If hardware flow control is desired, Pin 4 (request to send—RTS)
and Pin 5 (Clear-to-Send—CTS) are also required.

Pin 24 is the Remote Switchover Input. This input can be used to
switch which transceiver is active. A -12 Vdc to +12 Vdc transition
causes the redundant station to switch operation from the currently
active transceiver to the standby transceiver. The front panel radio
selection switch must also be in the

AUTO

position.

An expanded list of pin functions is provided in the transceiver’s
Installation and Operation Manual.

Invisible place holder

Pin

Description

Remote Switchover Input*

Diagnostic Channel Enable**

Future useDo not connect

9.9 Vdc Regulated Output**

Alarm Output**

Unused

RSSI Voltage**

Unregulated DC Output

Remote RTU ResetVV

Unused

PTTVV

PTTVV

Pin
No.

25
24
23
22
21
20
19
18
17
16
15
14

Pin

Pin

No.

Description

13

Unused

12

Unused
Receive Audio Output

11
10

Receive Unsquelch Sensor

9

Transmit Audio Input

8

Data Carrier Detect (DCD)

7

Signal Ground

Data Set Ready (DSR)

6
5

Clear-to-Send Output (CTS)
Request-to-Send Input (RTS)

4

Received Data (RXD)

3
2

Transmitted Data (TXD)

1

Protective Ground

* Unused in Transceivers

** Not Available in Redundant Stations

 Required in most installations

V Not used in 9820

Figure 9. Redundant Transceiver Chassis

interface connector pins

As viewed from outside the chassis

4. Connecting to alarms. If alarm equipment (a lamp or sounding
device, for example) will be used with the Redundant Station, make
the appropriate connections to the rear panel

ALARM terminals.

13

These are “dry” (isolated) alarm contacts which activate when either

of the transceivers inside the chassis generates an alarm signal. Con­nections are provided for Normally Open (NO) and Normally
Closed (NC) contacts. These contacts are rated for 0.5 ampere at
125 VAC or 1.0 ampere at 24 Vdc.

5. Connecting to primary power. Connect the A and B power sup-
plies to the power source. Figure 10 shows the location of the A and
B power supplies.

POWER INPUT
TRANSCEIVER A

POWER INPUT
TRANSCEIVER B

POWER SUPPLY MODULES

(AC TYPE SHOWN)

GROUND

CONNECTION

Figure 10. Chassis rear panel showing

A and B power supply connections

5.5 Programming the Transceivers

Use these instructions to initialize each transceiver within the chassis
using a Hand-Held Terminal (HHT). (Review the Programming section
of the transceiver’s Installation and Operation Manual if you are unfa­miliar with connecting and using the HHT.)

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1. Connect an HHT to the

14

DIAG(NOSTICS) A

connector on the rear
panel of the chassis (see Figure 11). This jack is connected to
Transceiver A inside the chassis.

Invisible place holder

DIAGNOSTICS (B)

DIAGNOSTICS (A)

F5

F4

E

F3

D

3

F2

C

2

F1

J

B

1

I

A

(

6

/

H

5

G

O

4

N

)

F

9

M

8

*

L

T

7

S

K

#

R

0

–

Y

Q

=

,

P

X

W

+

ENTER

ACE

V

SP

ESC

U

BKSP

SHIFT

CTRL

Z

Figure 11. HHT connected to the Redundant Transceiver Chassis

2. After the HHT beeps, press to display the ready “>”

ENTER

prompt.

3. Enter the command

INIT xx20 (where xx are the first two digits of

the WDS transceiver model number) to invert the sense of Pin 25 on
the

DATA INTERFACE connector (cause Pin 25 to trip only for major

alarms).

4. If the Redundant Transceiver Chassis is equipped with a second
transceiver:

a. Toggle the radio’s front panel selection switch to

B to force

selection of Transceiver B. (You will have an opportunity to
reset the selection switch to the proper setting in a later step.)

b. On the rear panel, disconnect the HHT from the

connector and reconnect it to the

A

DIAG(NOSTICS) B

DIAG(NOSTICS)

connector.

c. Repeat Steps 3 and 4 for Transceiver B.

This completes programming of the Redundant Transceiver Chassis’s
transceivers.

If the Redundant Transcei ver Chassis is being used in a repeater-assisted
system, use the following guidelines to complete Redundant T ransceiver
Chassis configuration.

Otherwise, skip to Section 5.7, Mounting the Redundant Transceiver
Chassis, on page 17.

15

5.6 Configuring the Redundant Transceiver

Chassis as a Repeater

Figure 5 on page 9 illustrates the use of a Redundant Station as a
repeater. Here are some specific requirements for repeater systems:

A) Antennas—Two antennas are required at repeater stations—one for
each radio. Measures must be taken to minimize the chance of interfer­ence between these antennas. One effective technique for limiting inter­ference is to employ vertical separation. In this arrangement, one
antenna is mounted directly over the other, separated by at least 4 feet
(1.22 Meters). This takes advantage of the minimal radiation exhibited
by most antennas directly above and below their driven elements.

Another interference reduction technique is to cross-polarize the
repeater antennas. If one antenna is mounted in the vertical plane, and
the other in the horizontal plane, an additional 20 dB of attenuation can
be achieved. (Remember that the corresponding stations must use the
same antenna orientation when cross-polarization is used.)

B) Interface Wiring—A null-modem cable (Figure 12) is required
between the
repeater station. This allows them to freely exchange data even though
they are both configured as DCE devices.

DATA INTERFACE

connectors of the two radios forming a

Invisible place holder

P-20 #1

(DCE)

TXD

GND GND

DCD

RTS

2

3

7

8

4

Figure 12. Data interface cable wiring for null-modem cable

Used for Repeater

RXD

3

TXDRXD

2

7

RTS

4

DCD

8

P-20 #2

(DCE)

16

5.7 Mounting the Redundant Transceiver Chassis

The P20 Redundant Transceiver Chassis can be placed on a sturdy
tabletop, or mounted in a 19 inch rack cabinet or equipment rack.
Choose a mounting location that provides easy access to the rear panel
connectors and an unobstructed view of the LED status indicators (also
on the rear panel). Figure 13 shows the dimensions of the Redundant
Transceiver Chassis.

Invisible place holder

3.46"

88 mm

19.05"

484 mm

15.43"
392 mm

Figure 13. P20 Redundant Transceiver Chassis

mounting dimensions

17

6.0 INITIAL START-UP

In-service operation of the P20 Redundant Transceiver Chassis as a
Redundant Station is completely automatic. Once the unit has been
properly installed and configured, operator actions are limited to
observing the LED status indicators for proper operation.

If all parameters are correctly set, operation of the Redundant Station
can be started by following these steps:

1. Apply primary power.

2. Select the active transceiver by setting the front panel

TION

switch to A, B or

AUTO

. (See Table 2 for an explanation of the

switch positions.)

Invisible place holder

Figure 14. Redundant Transceiver Chassis

radio selection switch

Table 2. P20 radio selection switch positions

Switch Position Function

A Transceiver A is selected as the active unit. Switchover will not

AUTO The most recently selected transceiver is active. If a failure

occur if a failure occurs in Transceiver A or if the Remote
Switchover Input (Interface connector Pin 24) is toggled.

occurs with that side, switchover automatically occurs to the
other transceiver.

RADIO SELEC-

3. On the rear panel, observe the transceiver LED status panel(s) for

18

Also, when the switch is in this position, the Remote Switchover
Input (Interface connector Pin 24) can be toggled to switch
transceiver.

B Transceiver B is selected as the active unit. Switchover will not

occur if a failure occurs in Transceiver B or if the Remote
Switchover Input (Interface connector Pin 24) is toggled.

Invisible place holder

the proper indications. The LEDs can be seen through the Redun­dant Transcei v er Chassis’s viewing slots (Figure 15). Figure 16 and
Table 3 describe the LED appearance for spread spectrum transceiv-

ers (models 9820, 24820, etc.). Figure 17 and Table 4 describe the
LED appearance for non-spread spectrum transceivers (models
4720, 9720, 2720, 3720, etc.).

4. After the basic operation of the Redundant Transceiver Chassis has
been checked, you may wish to optimize transceiver performance
using some of the suggestions in the transceiver’s Installation and
Operation Manual (Performance Optimization section).

Invisible place holder

LED VIEWING SLOT

(TRANSCEIVER B)

LED VIEWING SLOT
(TRANSCEIVER A)

Figure 15. LED viewing slots

In a normally operating system, the following LED indications will
be seen within 16 seconds of start-up:

•

•

•

lamp lit continuously

PWR

lamp lit continuously (spread spectrum transceivers only)

SYNC

lamp will either be lit continuously or flashing (non-spread

DCD

spectrum transceivers only)

• Remote radio
(

) with the master station

RXD

(s)

transmitting data (

TXD

) and receiving data

Invisible place holder

PWR SYNC TXD RXD

Figure 16. LED status indicators for spread spectrum transceivers

19

Invisible place holder

Table 3. LED status indicators for spread spectrum transceivers

LED Name Description

PWR • Continuous—Power is applied to the radio; no problems detected.

• Flashing 5 times per second—Fault indication. See the
Troubleshooting section of the transceiver’s Installation and
Operation Manual.

• Flashing once every 4 seconds—Radio is in Sleep Mode.

SYNC Lights continuously to indicate the radio is receiving/sending

TXD Indicates EIA-232 space (logic high) signal input to the DB-25

RXD Indicates EIA-232 space (logic high) signal output from the DB-25

synchronization frames. Within 16 seconds of power-up, this LED
should be lit continuously.

connector.

connector.

Invisible place holder
Invisible place holder

PWR DCD TXD RXD

Figure 17. LED status indicators for non-

spread spectrum transceivers

Invisible place holder

Table 4. LED status indicators for non-

spread spectrum transceivers

LED Name Description

PWR • Continuous—Power is applied to the radio; no faults detected.

• Rapid flash (five times per second)—Fault indication. See the
Troubleshooting section of the transceiver’s Installation and
Operation Manual.

• Moderate flash (once per second)—Internal firmware error.
Instructions for upgrading the radio’s software can be found in the
transceiver’s Installation and Operation Manual.

• Flashing once every 5 seconds—Radio is in Sleep Mode.

DCD • Flashing—Indicates the radio is receiving valid data frames.

• Continuous—Radio is receiving a data signal from a continuously

keyed radio.

TXD An RS-232 mark signal is being received at the DATA INTERFACE.
RXD An RS-232 mark signal is being sent out from the DATA INTERFACE.

20

7.0 TROUBLESHOOTING

The LED status indicators are an important troubleshooting tool and
should be checked whenever a problem is suspected. When an alarm
condition exists, the transceiver creates an alarm code that can be read
on an HHT connected to the radio’s

DIAG(NOSTICS) port. These codes

can be very helpful in resolving many system difficulties.

Specific information about interpreting LED and alarm codes is pro­vided in the Troubleshooting section of the Installation and Operation
Manual shipped with your transceiver.

8.0 TECHNICAL REFERENCE

This section contains instructions for replacing assemblies in the Redun­dant Transceiver Chassis in the event a component fails:

Table 5. Replacement part numbers

Power Supply 03-1143A12 115/230 VAC

03-2613A02 18-36 VDC
03-2613A03 36-75 VDC
03-2613A04 10.5-16 VDC

Switchover Logic Board 03-3306A01
Battery Control Board 03-3362A01
Indicator Board 03-3307A01
Backup Battery 28-1575A03

8.1 Replacing Power Supply Modules

The Redundant Transceiver Chassis power supplies (03-1143A12) are
each held in place with two knurled thumbscrews at each side of the
module. To remove a power supply, loosen the two captive screws and
slide the unit straight out. (There are no cables to disconnect, as the mod­ules are fitted with in-line connectors.)

To re-install these modules, make sure that the slides are properly
aligned with the guide slots on the chassis, and push straight in. Tighten
the thumbscrews to secure the assembly.

8.2 Replacing Other Assemblies

The Switchover Logic Board (03-3306A01), Battery Control Board
(03-3362A01) and Indicator Board (03-3307A01) are all held in place
with Phillips screws. To remove any of these assemblies, disconnect all
connectors from the board and remove the mounting screws. The boards
can then be removed from the chassis.

21

The Backup Battery (28-1575A03), if present, can be removed by loos­ening the bracket that holds it to the chassis and disconnecting its
push-on terminals. Use care not to short the battery terminals during
removal.

22

INDEX

A

Antenna

port configurations

Antenna system gain, defined

3

4

B

Battery Control Board, replacing
Bit, defined
Bits-per-second. See BPS
BPS (bits-per-second), defined
Byte, defined

4

4

21

4

C

Cable, null modem (data interface cable wiring for)
Configurations

antenna port
chassis

3

2

16

D

Data interface, wiring for null-modem cable, illustrated
dB (decibel), defined 4
dBi, defined
dBm, defined
DCE (Data Circuit-terminating Equipment), defined
Dimensions, mounting
DSP (Digital Signal Processing), defined
DTE (Data Terminal Equipment), defined

4

5

17

5

5

E

H

Hardware flow control, defined
HHT connected to P20 chassis, illustrated
Host computer, defined 5

5

15

I

Illustrations

data interface cable wiring for null-modem cable
HHT connected to P-20 chassis
interface connector pins
LED status indicators (non-spread spectrum transceivers)
LED status indicators (spread spectrum transceivers)
LED viewing slots 19
model configuration codes
P20 chassis
P20 chassis, internal view
P20 mounting dimensions 17
P20 rear panel
P20 shipment contents
power supply connections
radio selection switch
redundant station used as master station
redundant station used as remote station

16

5

repeater system configuration using redundant station

Indicator Board, replacing
Installation

configuring P-20 as a repeater
connecting wiring
initial start-up
mounting chassis
overview
planning
programming transceivers
transceivers

Interface connector pins, illustrated

1

12

18

9–17

12

18

17

9, 10

7

11

15

13

3

12

10

14

21

16

14

13

16

20

19

7

8

9

Equalization, defined

5

F

Fade margin, defined
Features
Frame, defined 5

2

5

G

Glossary

I-1

4

L

Latency, defined
LED status indicators

for non-spread spectrum receivers, illustrated
for spread spectrum receivers, illustrated

LED viewing slots, illustrated 19

5

M

MAS (Multiple Address System), defined
Master Station

20

19

5

P20 used as a

MCU (Microcontroller Unit), defined
Model configuration codes, illustrated

7

6

3

P

P20 chassis

configurations
features
HHT connected to, illustrated
how to mount
illustrated 1
internal view, illustrated
rear panel, illustrated
replacement parts for
shipment contents
shipment contents, illustrated 10
transceiver models compatible with
use as a Master Station
used as a remote station
used as repeater

PLC (Programmable Logic Controller), defined 6
Point-Multipoint System, defined
Poll, defined
Power supply

rear A/B connections, illustrated
replacing module

Procedures

configuring P-20 as a repeater
connecting wiring
initial start-up
installation, overview
installing transceivers
mounting P-20 chassis
programming transceivers
replacing parts (Technical Reference)
troubleshooting

2

2

15

17

12
12
4

10

2

7

8

8

6

6

14

21

16

12

18

10
11

17

14

21

21

replacing

RTU (Remote Terminal Unit), defined

21

6

S

SCADA (Supervisory Control and Data Acquisition), defined
Start-up procedures
Switchover Logic Board, replacing
SWR (Standing Wave Radio), defined

18

21

6

T

Tables

LED status indicators (non-spread spectrum transceivers)
LED status indicators (spread-spectrum transceivers)
radio selection switch positions

Technical reference (assembly replacement)
Transceivers

initial programming
installation of
models compatible with P-20 chassis

Troubleshooting

14

11

21

18

21

2

20

20

W

Wiring, connecting

12

6

R

Radio selection switch, illustrated
Rear panel

connections, illustrated
power supply connections, illustrated

Redundant operation, defined
Redundant Station

repeater system configuration using, illustrated
used as a Master Station, illustrated
used as remote station, illustrated

Remote Station

redundant station used as, illustrated

Remote Station, defined
Remote station, P-20 used as 8
Repeater

configuring P-20 as
P-20 chassis used as
system configuration using redundant station, illustrated

Replacement parts

12

6

16

8

4

I-2

18

14

6

7

8

8

9

9

NOTES

NOTES

IN CASE OF DIFFICULTY...

WDS products are designed for long life and trouble-free operation. However, this equipment, as
with all electronic equipment may have an occasional component failure. The following informa­tion will assist you in the event that servicing becomes necessary.

F ACT ORY TECHNICAL ASSIST ANCE

Technical assistance for WDS products is available from our Customer Support Team during
business hours (8:30 A.M.-5:30 P.M.Beijing Time). When calling, please give the complete
model number of the radio, along with a description of the trouble symptom(s) that you are expe­riencing. In many cases, problems can be resolved over the telephone, without the need for
returning the unit to the factory.

Please use the following telephone numbers for product assistance:
856-755-83849417 (Phone)
856-755-83849434 (FAX)

FACTORY REPAIRS

Component-level repair of radio equipment is not recommended in the field. Many components
are installed using surface mount technology, which requires specialized training and equipment
for proper servicing. For this reason, the equipment should be returned to the factory for any PC
board repairs. The factory is best equipped to diagnose, repair and align your radio to its proper
operating specifications.

If return of the equipment is necessary, you will be issued a Returned Material Authorization
(RMA) number. The RMA number will help expedite the repair so that the equipment can be
repaired and returned to you as quickly as possible. Please be sure to include the RMA number on
the outside of the shipping box, and on any correspondence relating to the repair. No equipment

will be accepted for repair without an RMA number.

A statement should accompany the radio describing, in detail, the trouble symptom(s), and a
description of any associated equipment normally connected to the radio. It is also important to
include the name and telephone number of a person in your organization who can be contacted if
additional information is required.

The radio must be properly packed for return to the factory. The original shipping container and
packaging materials should be used whenever possible. All factory returns should be addressed to:

Shenzhen Sinosun Wireless Data Systems Inc.
Customer Service Department

3A12,South Cangsong Building, Tairan Industrial Business Park

Futian District, Shenzhen,Guangdong, China

When repairs have been completed, the equipment will be returned to you by the same shipping
method used to send it to the factory. Please specify if you wish to make different shipping
arrangements.