IRT DDA-4280 User manual

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IRT Eurocard
Type DDA-4280
2.048 Mbps (E1) G.703
Data Distribution Amplifier
Designed and manufactured in Australia
IRT can be found on the Internet at:
http://www.irtelectronics.com
I R T Electronics Pty Ltd A.B.N. 35 000 832 575
26 Hotham Parade, ARTARMON N.S.W. 2064 AUSTRALIA
National: Phone: [phone] Fax:[phone]
International: [phone] [phone]
Email: [email protected]
Web: www.irtelectronics.com

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IRT Eurocard
Type DDA-4280
2.048 Mbps (E1) G.703
Data Distribution Amplifier
Instruction Book
Table of Contents
Section Page
Operational Safety 2
General Description 3
Functional Diagrams 4
Technical Specifications 5
ZDA-4300RH Technical Specifications 6
Electrical characteristic of ITU-T G.703 2.048 Mb/s (E1) signal 6
Coding characteristic of ITU-T G.703 2.048 Mb/s (E1) signal 7
G.703 data signal format 7
Configuration 8
Installation 9
SMU-4000 Installation 11
Figure 1: SMU-4000 module 11
Front and rear layouts 12
Operation 13
SNMP –What Is It? 14
DDA-4280 SNMP Functions 16
Maintenance & Storage 17
Warranty & Service 17
Equipment return 17
This instruction book applies to units later than S/N 0901001.
Operational Safety:
WARNING
Operation of electronic equipment involves the use of voltages and currents that may
be dangerous to human life. Note that under certain conditions dangerous potentials
may exist in some circuits when power controls are in the OFF position.
Maintenance personnel should observe all safety regulations.
Do not make any adjustments inside equipment with power ON unless proper
precautions are observed. All internal adjustments should only be made by suitably
qualified personnel. All operational adjustments are available externally without the
need for removing covers or use of extender cards.

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IRT Eurocard
Type DDA-4280
2.048 Mbps (E1) G.703
Data Distribution Amplifier
General Description
The DDA-4280 data distribution amplifier is intended for use with E1 data signals conforming to the
ITU Rec. G.703. The DDA-4280 is primarily intended for use in pairs with a double width rear assembly for
automatic path protection applications, although it is supplied as standard with its own rear assembly for stand-alone
applications.
Four outputs are provided at the rear of the module with an additional output for monitoring purposes on the front
panel. One output (O/P 1) is controlled by relays to provide a bypass signal from the input in the event of a power
failure.
Indicators are provided on the front panel for:Data loss
AIS detect
Module in service
Module in standby
Changeover inhibit and changeover request switches are provided on the front panel for use where modules are
linked in pairs for redundancy. For this configuration the double width rear assembly is needed to link the logic
sections of two modules.
When used as a distribution amplifier the DDA may be housed in any of IRT’s standard Eurocard frames. When
used in pairs for handshake operation only 3 RU chassis types may be used so that the double width rear assembly
may be used.
The DDA-4280 is also equipped with Simple Network Management Protocol (SNMP) monitoring so that status and
alarms can be remotely monitored and controlled via an Ethernet connection. This function is only available when
the unit is housed in an IRT 4000 series frame fitted with an SNMP agent module.
Standard features:
•Data regeneration with Jitter Attenuator
•Front panel monitoring facility.
•Protection switching facility.
•External alarms and bypass.
•Redundant pair operation capability.
•Simple Network Management Protocol (SNMP) monitoring.

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Functional Diagrams
J 3
ZDA-4300RH Handshake Diagram
J 2
J 4
INPUT
1J1
RELAY
RL1.1
RELAY
RL1.2
OUTPUTS
DDA-4280
SIGNAL
PROCESSING
RELAY
RL5-2
INPUT
2J1
RELAY
RL1.1
RELAY
RL1.2
RELAY
RL5-2
RL2-1
RL2-1
RL3
RL3
Output Driver
FPGA
E1Generator,
Change over logic,
AIS Detector
INPUT
(SK
5
)
RL1-2
OUTPUTS
(SK4)
Data
Reg. with
Jitter Att
MON
(SK
2
)
Block diagram DDA-4280 -Signal path
(SK9)
(SK8)
Output Driver
Output Driver
Output Driver Output Driver
(SK13)
RL1-1
O/P 1
O/P 4
O/P 3
O/P 2
GND
(
SK6
-
3
)
SNMP
Control
RL5-2
RL2-2
RL2-1
RL3-1
General Alarm
(
SK6
-
2
)
Power Fail Alarm
(
SK6
-
1
)
DDA-4280
SIGNAL
PROCESSING

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Technical Specifications
IRT Eurocard module
Type DDA-4280
In accord with ITU-T Rec. G.703 –see Electrical characteristics of G.703 signals.
Input:
Type Transformer coupled.
Impedance 75 Ωterminated.
Outputs:
Number 1 switched, 3 non-switched, regenerated, reclocked shaped outputs located
on rear connection assembly and 1 located on front panel.
Impedance 75 Ωsource terminated.
Electrical Characteristics:
Cable Type Coaxial
Other See G.703 Specification for 2.048Mb/s data rate
Controls & alarms:
Input:
External changeover request A ground applied to this input will emulate the operation of the front
panel switch “Change Request”.
Outputs:
Power failure Contact to open circuit if power has failed.
General alarm Contact to open circuit if
Data Loss is detected OR AIS is detected
Connectors: Data: BNC
Alarm: Krone LSA plus
Indicators: Data loss.
AIS detect.
Module in service.
Module in standby.
Power requirements 28 Vac CT (14-0-14) or ±16 Vdc.
Power consumption < 4 VA
Temperature range 0 -50° C ambient
Mechanical Suitable for mounting in IRT 19" rack chassis types with input output and
power connections on the rear panel.
Finish: Front panel: Grey background, black lettering & red IRT logo.
Rear assembly: Detachable silk-screened PCB with direct mount connectors to Eurocard
and external signals.
Dimensions 6 HP x 3 U x 220 mm IRT Eurocard
Standard accessories Rear connector assembly.
Optional accessories ZDA-4300RH Double width rear assembly for handshake connection of
two DDA-4280's (number of outputs drops to 3).
Due to our policy of continuing development, these specifications are subject to change without notice.

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ZDA-4300RH Technical Specifications
Controls & alarms:
Outputs:
Bypass Contact to open circuit if power has failed.
General Alarm Contact to open circuit if:-
a. Data Loss is detected OR
b. AIS is detected AND the AIS disable switch (SW3-4) is not set.
In Service (Main) Path Indication Transistor switch to ground if card is active.
Connectors: Data: BNC.
Alarm: Krone LSA plus.
In Service (Main) Path: Krone LSA plus.
Changeover logic:
A changeover to the companion module will occur under any of the following conditions:
Loss of input signal
AIS detection alarm (provided AIS is not disabled by switch SW3-4)
Loss of power
In all of the above cases switching will only occur if:
companion module is able to provide an output free of the same defects and
changeover inhibit switch is not activated on either module.
Priority logic:
The priority switching in normal mode follows non reverting logic which dictates:
In the event of failure of main then standby DDA will assume control and become Main causing the failed
path DDA to become Standby.
This implies that when the failed path is restored that it will remain as Standby and not become Main unless either a
failure of Main occurs or a manual changeover is requested.
Power on reset.
When power is applied to the pair, the power on reset signal will set the module which was last enabled as Main as
Main and the other module will be forced to act as Standby.
When power is applied to a pair for the first time it may be necessary to force the desired module to become Main by
pressing the Change Request button on the front panel of the desired module. The Main module will be indicated by
the In Service LED being lit on the front panel.
Due to our policy of continuing development, these specifications are subject to change without notice.
Electrical characteristics ITU-T G.703 2.048 Mb/s (E1) signal:
Cable Type Coaxial
Impedance 75 Ω
Signal level 2.37 V
Nominal pulse width 244 ns
Code conversion HDB3
Pulse shape Fig. 15 of ITU-T G.703 Specification (11/2001).
Jitter at input port Section 7 of ITU-T G.823 Specification (03/2000).
Jitter at output port Section 5 of ITU-T G.823 Specification (03/2000).
Return loss at input ports:
51 kHz to 102 kHz 6 dB
102 kHz to 3072 kHz 8 dB

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Coding characteristic of ITU-T G.703 2.048 Mb/s (E1) signal:
The HDB3 (High Density Bi-polar of order 3) code as defined in G.703 for 2.048 Mb/s (and 34.368 Mb/s)is as
follows:
Binary 1 bits are represented by alternate positive and negative pulses and binary 0 bits by spaces. Exceptions
are made when strings of successive 0 bits occur in the binary signal.
Each block of 4 successive zeros is replaced by 000V or B00V where B is an inserted pulse of the correct
polarity and V is an inserted pulse violating the polarity rule. The choice of 000V or B00V is made so that the
number of B pulses between consecutive V pulses is odd so that successive V pulses are of alternate polarity
and so no DC component is introduced.
G.703 data signal format.
The following waveforms are intended to give some idea of the type of signal at various points in the DDA when in
operation. They are not intended as accurate portrayals of either voltage levels or timing.
It can be seen that the original signal has both positive and negative going pulses. This format is used so that the
signal does not rely on DC levels. To preserve the AC nature of the signal a coding system is used to ensure that a
succession of either ‘1’s or ‘0’s in the original data does not produce a DC output. The coding system varies
according to the type of G.703 signal (See specifications for each module and Coding characteristics above.)
It can be seen that the cable effected signal bears little resemblance to the original signal and due to the high
frequency attenuation looks more like a noisy analogue signal than a digital signal. The input equaliser circuit in the
DDA enhances the high frequency response and detects the rate of change of the signal to produce a squared up
signal with fast rise and fall times suitable for processing and re-clocking.
Original signal
Cable effected signal
Equalised signal

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Configuration
The only user settings on the DDA-4280 is on the DIP switch SW3 as shown below:
SW4-1Not used.
SW4-2Not used.
SW4-3Not used.
SW4-4 OFF Disable switching on AIS†input (when used in handshaking mode).
ON Enable switching on AIS†input (when used in handshaking mode).
SW4-5Not used.
SW4-6Not used.
SW4-7Not used.
SW4-8Not used.
NOTE: †AIS stands for Alarm Indication Signal.
ZDA-4300RH Link Settings:
When the ZDA-4300RH is used with a DDA-4280, Direct links LK1, LK3 and LK5 should be installed (default
position).
1
ON
2 3 4 5 6 7 8
DIP
SW3

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Installation
Pre-installation:
Handling:
This equipment may contain or be connected to static sensitive devices and proper static free handling precautions
should be observed.
Where individual circuit cards are stored, they should be placed in antistatic bags. Proper antistatic procedures
should be followed when inserting or removing cards from these bags.
Power:
AC mains supply: Ensure that operating voltage of unit and local supply voltage match and that correct rating fuse
is installed for local supply.
DC supply: Ensure that the correct polarity is observed and that DC supply voltage is maintained within the
operating range specified.
Earthing:
The earth path is dependent on the type of frame selected. In every case particular care should be taken to ensure that
the frame is connected to earth for safety reasons. See frame manual for details.
Signal earth: For safety reasons a connection is made between signal earth and chassis earth. No attempt should be
made to break this connection.
Installation in frame or chassis:
See details in separate manual for selected frame type.
G.703 data connections –stand alone operation:
For use with supplied standard rear assembly.
Connect the input and as many output connections as required. Only good quality 75 Ohm connectors and cable
should be used. The use of 50 Ohm BNC connectors may cause serious reflection problems with G.703 signals,
causing data errors.
In general cable runs should be kept as short as possible and should not exceed 200 metres for reliable error free
operation.
Stand-alone alarm connections:
A Krone type connector is provided on the rear panel of the module providing the following:
Pin 1Connection to open circuit indicates a loss of power alarm.
2Connection to open circuit indicates a general signal alarm.
3Not used.
4Ground.

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G.703 data connections -handshake operation:
The ZDA-4300RH is a double width rear assembly that takes the place of two standard rear assemblies that would
normally be fitted side by side. The ZDA-4300RH supplies the necessary controls between the two main cards.
Connect the two separate inputs and as many output connections as required. J2 corresponds to Output 1, J3
corresponds to Output 2, and J4 corresponds to Output 3. Only 3 of the 4 outputs are switched. The 4th output does
not pass through. Only good quality 75 Ohm connectors and cable should be used. The use of 50 Ohm BNC
connectors may cause serious reflection problems with G.703 signals, causing data errors.
In general cable runs should be kept as short as possible and should not exceed 200 metres for reliable error free
operation.
Handshake alarm connections:
Two Krone type connectors, 1SK2 and 2SK2, corresponding to each of the cards are provided on the rear panel of
the module providing the following:
Pin 1Connection to ground indicates module is in bypass mode (loss of power).
2Connection to ground indicates a general signal alarm.
3External changeover request –connection to ground will make this module Main in
handshake mode.
4Ground.
A third Krone type connector (SK3) provides remote status of which unit is In Service (Main).
Pin 1Connection to ground indicates that module 1 is the In Service (Main) module.
2Connection to ground indicates that module 2 is the In Service (Main) module.
3Ground.

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SMU-4000 Installation
The SMU-4000 plug-in SNMP management controller module can only be fitted to IRT’s 4000 series modules that
are capable of being SNMP upgradeable. To determine whether a module is SNMP upgradeable, a square section on
the main PCB is silk screened and fitted with three multipin sockets –as shown below:
This is where the SMU-4000 plug-in SNMP management controller module is fitted. The three sets of multipins on
the underside of the SMU-4000 line up with the three sets of multipin sockets on the main PCB module. Align all
pins and then gently press the SMU-4000 all the way down into place.
If the SMU-4000 is not already programmed with the correct firmware to match the module that it is being plugged
into, it then needs to be programmed via the pins on the topside of the SMU-4000.
Note that installation will generally be done by IRT Electronics at the time of ordering.
Note also that an SMU-4000 will only be functionally operational when the main module that it is plugged into is
fitted into an IRT SNMP capable frame fitted with a CDM-xxxx SNMP agent and being interrogated by a suitable
Network Management System.
1J2
1J1
1J3
Figure 1: SMU-4000 module

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Front & rear panel connector diagrams
The following front panel and rear assembly drawings are not to scale and are intended to show connection order and
approximate layout only.
1
2
3
4
OUTPUT 4
INPUT
PL4
SK 13
SK 4
SK 9
SK 8
SK 6
OUTPUT 2
OUTPUT 3
OUTPUT 1
PL5
SK 5
N140
MON.
ALLOW
INHIBIT
REQUEST
AIS
STANDBY
CHANGE
DATA
LOSS
MAIN
DDA-4280 ZDA-4300RH
1
2
3
4
2SK 2
J 2
J 3
OUTPUTS
J 4
1
2
3
4
SK 3
1J 1
INPUT
MODULE 2 INPUT MODULE 1
1SK 2
1
2
3
2J1
DIRECT
1P3
1P2
2P3
2P2
DIRECT DIRECT
LK1LK5 LK3
SHAPED
LK2
SHAPED
LK4
SHAPED
LK6

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Operation
Stand-alone operation:
When used in a stand-alone situation, that is non-hand shaking mode, the DDA-4280 behaves as a standard
2.048 Mb/s G.703 distribution amplifier.
One input is electronically split into four outputs. On loss of power to the unit the input is automatically bypassed to
output 1 via on board relays.
A loss of power alarm and general alarm (loss of signal, AIS detect) is provided by relay contacts to open circuit via
the Krone connector on the rear assembly, see Installation section of this manual for connections.
Front panel LEDs indicate the presence of a valid input signal (In Service (Main) –green), the absence of a valid
input signal (Data Loss –Red) and the detection of an alarm indication signal within the inputted signal (AIS –Red).
The Standby LED (green) is not used in the stand-alone operation.
The front panel change switches do not work when used in a stand-alone operation.
Handshake operation:
When used in the handshake mode, two cards fit side by side plugged into a ZDA-4300RH. The ZDA-4300RH
provides the necessary interconnect controls to automatically switch between the input signals to the outputs,
provided that the toggle switch on the front panels of the units are set to Change Allow and not Change Inhibit.
Automatic switching parameters are set by a loss of input condition and switch SW3 settings as described in the
Configuration section of this manual.
When the toggle switch is set to Change-Inhibit both automatic and manual switching of the input signals is not
possible.
When the units are first turned on one unit will take the responsibility of being In Service (Main)whilst the other will
become the Standby unit. It may be necessary to manually swap the two states if they do not start in the required
configuration by pressing the front panel manual switch on the unit that is desired to be acting as the In Service
module. Note that in order to do so the toggle switch should also be set to the Change-Allow position on both
modules.
Loss of power alarms and general (loss of signal, AIS detect) alarms are provided by relay contacts to open circuit
via two Krone connectors on the rear assembly. External changeover request is also provided via these same Krone
connectors. In Service (Main) tally indication is via a third Krone connector, see Installation section of this manual
for connections.
Front panel LEDs, on both units, indicate the presence of a valid input signal (In Service (Main) –green, or
Standby -green ), the absence of a valid input signal (Data Loss –Red) and the detection of an alarm indication
signal within the inputted signal (AIS –Red).

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SNMP
What Is It?
SNMP stands for Simple Network Management Protocol. It is an application layer protocol for managing IP
(Internet Protocol) based systems. SNMP enables system administrators to manage system performance, and to find
and solve system problems. SNMP runs over UDP (User Datagram Protocol), which in turn runs over IP.
Three types of SNMP exist: SNMP version 1 (SNMPv1), SNMP version 2 (SNMPv2) and SNMP version 3
(SNMPv3). It is not the intention here to discuss the differences between various versions, only to bring attention to
the fact that IRT Electronics modules, fitted with SNMP capability, use SNMPv1.
An SNMP managed network consists of three key components: Network Management Systems (NMS), agents, and
managed devices.
An NMS is the console through which the network administrator performs network management functions, such as
monitoring status (e.g. alarm states) and remote controlling, of a set of managed devices. One or more NMSsmust
exist on any managed network. Generally the NMS is a computer running third party SNMP control software. There
are a number of third party SNMP software applications currently available on the market.
An NMS polls, or communicates with, an agent. An agent is a network management software module that resides in
a managed device. An agent has local knowledge of management information and translates that information into a
form compatible with SNMP. The agent, therefore, acts as an interface between the NMS and the managed devices.
The NMS sends a request message, and control commands for the managed devices, to the agent, which in turn sends
a response message, containing information about the managed devices, back to the NMS.
A managed device contains an SNMP agent and resides on a managed network. Managed devices collect and store
management information and make this information available to NMSs using SNMP.
Managed device agent variables are organised in a tree structure known as a Management Information Base (MIB).
Within the MIB are parameters pertaining to the managed device. An Object Identifier (OID) number within the MIB
defines the managed device type. This is a unique number specific to the model of managed device. Other
information relating to the device is also stored, information such as alarm states, controllable settings, etc. The MIB
tree is organised in such a way that there will be no two MIB files with conflicting placements.
Normally an NMS polls an agent for information relating to the MIB in a managed device to be sent back to the
NMS. When certain conditions are met within the MIB, such as major alarm conditions, for example, the agent
automatically sends what is known as a trap to the NMS without any prompting from the NMS. This allows automatic
notification of a predetermined event.
NMS
NMS
IP
Network
MIB
SNMP Agent
Protocol Engine SNMP Agent
MIB
SNMP Agent
Protocol Engine SNMP Agent
MIB
SNMP Agent
Protocol Engine SNMP Agent
SNMP Block Diagram

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SNMP with IRT Products:
IRT Electronics currently employs SNMPv1 with its SNMP capable frames. The frame acts as an agent when fitted
with a CDM-xxxx module. This module has its own designated slot next to the power supply so as to not affect the
number of modules that the frame will take. Communication between the NMS, the frame and its loaded modules are
via this CDM-xxxx module. Note that the NMS software is third party and not supplied by IRT Electronics.
Ethernet connection for SNMP operation is via an RJ45 connector on the rear of the frame, below the mains inlet.
Ethernet rate runs at either 10 baseT or 100 baseT.
Frame parameters, such as Name, Address and Location, are set via an RS232 interface, a D9 connector on the rear
of the frame below the mains inlet. A software terminal emulator, such as Tera Term or HyperTerminal, is used for
setting and reading the parameters of the frame.
IRT modules that are SNMP compatible need a plug-in SMU-4000 module with a program relevant to the module
that it is plugged into. Depending on the module, besides the module identification, parameters such as alarm states,
inputs and controls etc. are communicated to the CDM-xxxx agent via a data bus on the rear of the frame. Thus the
CDM-xxxx collects information on what is loaded within the frame, what positions they occupy, and their current
status for communication to the NMS when the NMS sends a request for information.
In the event of a major alarm from any of the SNMP compatible modules, or power supplies, a trap is automatically
sent by the CDM-xxxx agent to the NMS without any prompting by the NMS. This alerts the operator to any fault
conditions that may exist that need immediate attention.
FRU-4000
FRAME
110/240 V 50/60 Hz
0.7 A (max.)
FUSES
110/120 Vac
1A S.B.
220/240 Vac
500 mA S.B.
AS3260 approval no.: CS6346N
Ass. no.: 804692
+
-
48Vdc
Alarm
RS232
Ethernet
IRT SNMP Connections
IRT modules fitted
with SMU-4000
PSU’s
CDM
-
xxxx
IRT SNMP Frame
IRT SNMP Frame
IRT modules fitted
with SMU-4000
PSU’s
CDM
-
xxxx
Network Ethernet Cable
Ethernet Cable
Ethernet Cable
NMS
IRT SNMP Setup

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DDA-4280 SNMP Functions:
At the time of writing this manual, SNMP functions were still to be written for the DDA-4280. Contact IRT for
update of status.

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Maintenance & Storage
Maintenance:
No regular maintenance is required.
Care however should be taken to ensure that all connectors are kept clean and free from contamination of any kind.
This is especially important in fibre optic equipment where cleanliness of optical connections is critical to
performance.
Storage:
If the equipment is not to be used for an extended period, it is recommended the whole unit be placed in a sealed
plastic bag to prevent dust contamination. In areas of high humidity a suitably sized bag of silica gel should be
included to deter corrosion.
Where individual circuit cards are stored, they should be placed in antistatic bags. Proper antistatic procedures
should be followed when inserting or removing cards from these bags.
Warranty & Service
Equipment is covered by a limited warranty period of three years from date of first delivery unless contrary
conditions apply under a particular contract of supply. For situations when “No Fault Found” for repairs, a
minimum charge of 1 hour’s labour, at IRT’s current labour charge rate, will apply, whether the equipment is within
the warranty period or not.
Equipment warranty is limited to faults attributable to defects in original design or manufacture. Warranty on
components shall be extended by IRT only to the extent obtainable from the component supplier.
Equipment return:
Before arranging service, ensure that the fault is in the unit to be serviced and not in associated equipment. If
possible, confirm this by substitution.
Before returning equipment contact should be made with IRT or your local agent to determine whether the
equipment can be serviced in the field or should be returned for repair.
The equipment should be properly packed for return observing antistatic procedures.
The following information should accompany the unit to be returned:
1. A fault report should be included indicating the nature of the fault
2. The operating conditions under which the fault initially occurred.
3. Any additional information, which may be of assistance in fault location and remedy.
4. Acontact name and telephone and fax numbers.
5. Details of payment method for items not covered by warranty.
6. Full return address.
7. For situations when “No Fault Found” for repairs, a minimum charge of 1 hour’s labour will apply,
whether the equipment is within the warranty period or not. Contact IRT for current hourly rate.
Please note that all freight charges are the responsibility of the customer.
The equipment should be returned to the agent who originally supplied the equipment or, where this is not
possible, to IRT direct as follows.
Equipment Service
IRT Electronics Pty Ltd
26 Hotham Parade
ARTARMON
N.S.W. 2064
AUSTRALIA
Phone: [phone] Fax: [phone]
Email: [email protected]