IRT Communications
www.irtcommunications.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: (02) 9439 3744 Fax: (02) 9439 7439
International: +61 2 9439 3744 +61 2 9439 7439
Email: sales@irtelectronics.com
Web: www.irtelectronics.com
IRT Eurocard
Type DDA-3020
155 Mb/s G.703 (STM-1) Data Distribution Amplifier
&
ZDA-3021RH
Handshake Changeover Assembly
3020-dda.ib.rev0.doc
Designed and manufactured in Australia
IRT can be found on the Internet at:
http://www.irtelectronics.com
Page 1 of 17
09/03/2006
IRT Eurocard
IRT Communications
www.irtcommunications.com
Type DDA-3020
155 Mb/s G.703 (STM-1) Data Distribution Amplifier
&
ZDA-3021RH
Handshake changeover assembly
Instruction Book
Table of Contents
Section Page
Operational Safety 2
General Description 3
Technical Specifications 5
DDA-3020 5
ZDA-3021RH 6
Characteristics of signal types 7
Definition of CMI 7
Description of operation 8
Handshake operation 9
Configuration 11
Link settings 11
Switch settings 11
Installation 12
Front and rear layouts 14
Maintenance & Storage 17
Warranty & Service 17
Equipment return 17
This instruction book applies to units later than S/N 0402001.
Operational Safety:
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.
3020-dda.ib.rev0.doc
WARNING
Page 2 of 17
09/03/2006
IRT Eurocard
IRT Communications
www.irtcommunications.com
Types DDA-3020
155 Mb/s G.703
(STM-1)
Data Distribution Amplifier
&
ZDA-3021RH
Handshake changeover assembly
General Description
The DDA-3020 data distribution amplifier is intended for use with STM-1 data signals conforming to the
ITU Rec. G.703. The DDA-3020 is primarily intended for use in pairs with a double width rear assembly
(ZDA-3021RH) 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 3) 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 (Alarm Indication Signal)
Module in service
Module in standby.
External alarm signals are also available on the rear of the module.
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 ZDA-3021RH double width rear assembly is needed to
link the logic sections of two modules.
When used as a line equaliser or 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-3020 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 the SNMP agent module, CDM-4000.
Details of frame types are available separately.
Applications:
Stand alone cable equaliser or distribution amplifier
•
Paired for redundant path protection switching
•
Standard features:
Adaptive cable input equalisation
•
Data regeneration & re-clocking
•
Monitor facility
•
Power fail bypass facility
•
• External alarms and bypass
Redundancy handshake facility
•
Simple Network Management Protocol (SNMP) monitoring
•
IRT Eurocard construction compatible with other IRT Eurocard modules and frames
•
Dual power supply operation
•
3020-dda.ib.rev0.doc
Page 3 of 17
09/03/2006
(
)
(
)
y
y
(
)
(
)
(
)
(
)
(
)
(
)
IRT Communications
www.irtcommunications.com
Block diagram DDA-3020 - Signal path
INPUT
SK2
RL4
Cable EQ,
PLL
Output Driver
RL4
OUTPUTS
O/P 3
(SK6)
SNMP
Control
MON
SK1
CHANGE
REQUEST
SNMP
CONTROL
INPUT 1
(RIGHT)
SK3
FPGA
STM1 Generator,
Change over logic,
AIS Detector
Output Driver
Output Driver
Output DriverOutput Driver
General Alarm
RL1
(JP1-2)
RL2
Power Fail Alarm
(JP1-1)
GND
(JP1-4)
ZDA-3021RH - Handshake diagram 2 x DDA-3020
RL1
JP1-3
RL4
DDA SIGNAL
PROCESSING
RL2
RL3
RL4
RL2A
RL2B
RL1
O/P 1
(SK4)
O/P 2
(SK7)
O/P 4
(SK3)
JP1-2
JP1-1
JP3-T1
JP1-4
OUTPUTS
General Alarm
Power Fail Alarm
Out
R Tall
GND
O/P 2
SK5
O/P 1
SK1
O/P 4
SK9
O/P 3
SK6
INPUT 2
(LEFT)
(SK4)
SNMP
CONTROL
JP2-3
CHANGE
REQUEST
3020-dda.ib.rev0.doc
RL4
DDA SIGNAL
PROCESSING
Page 4 of 17
O/P 5
SK7
RL4
RL1
RL2
RL3
JP2-2
General Alarm
JP2-1
Power Fail Alarm
JP3-T2
L Tall
JP2-4
GND
Out
09/03/2006
Technical Specifications
IRT Communications
www.irtcommunications.com
IRT Eurocard module
Type DDA-3020
In accord with ITU-T Rec. G.703 155,520 kb/s – see Electrical characteristics of G.703 signals.
Input:
Type Transformer coupled.
Impedance 75 Ω terminated.
Equalisation Automatic for up to 200 m of Belden 8281 equivalent.
Outputs:
Number 1 switched, 3 non-switched, regenerated, reclocked unshaped outputs
located on rear connection assembly and 1 located on front panel.
Impedance 75 Ω source terminated.
Electrical Characteristics:
Cable Type Coaxial
Impedance 75 Ω
Signal level 1.0 V
Pulse Shape Unshaped, fig. 22&23/G.703
Nominal pulse width 9.64 ns
Code conversion Code Mark Inversion (CMI)
Return loss at input ports >
Controls & alarms:
Input:
External changeover request A ground applied to this input will emulate the operation of the front panel switch
Outputs:
Power Failure Contact closure to ground if power has failed.
General alarm Contact closure to ground if
a. Data Loss is detected OR
b. AIS is detected AND the AIS disable link (LK 3) is not installed.
AIS detection is defined as a series of all “1”s in the payload of a frame.
Data Loss is defined as less than 120 data “1”s in 512 G.703 data rate clock
Connectors:
Alarm: Krone LSA plus
Data: BNC
Indicators: DC power.
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
Finish: Front panel: Grey, silk-screened black lettering & red IRT logo.
Rear assembly: Detachable silk-screened PCB with direct mount connectors to Eurocard and
Dimensions 6 HP x 3 U x 220 mm IRT Eurocard
Standard accessories Rear connector assembly.
Optional accessories ZDA-3021RH double width rear assembly.
Due to our policy of continuing development, these specifications are subject to change without notice.
15dB over frequency range 8 MHz to 240 MHz
“Change Request”.
periods.
connections on the rear panel.
external signals.
3020-dda.ib.rev0.doc
Page 5 of 17
09/03/2006
ZDA-3021RH Technical Specifications
IRT Communications
www.irtcommunications.com
Controls & alarms:
Input:
External changeover request A ground applied to this input will emulate the operation of the front panel
switch “Change Request”.
Outputs:
Bypass Contact closure to ground if power has failed.
General Alarm Contact closure to ground if
a. Data Loss is detected OR
b. AIS is detected AND the AIS disable link (LK 3) is not installed.
Data Loss is defined as less than 120 data “1”s in 512 G.703 data rate clock
In Service (Main) Path Indication: Transistor switch to ground if card is Main.
Connectors:
Alarm: Krone LSA plus.
In Service (Main) Path: Krone LSA plus.
Data: BNC.
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 link LK 3)
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 lighting on the front panel.
AIS detection is defined as at least 2048 consecutive data “1”s.
periods.
3020-dda.ib.rev0.doc
Page 6 of 17
09/03/2006
Characteristics of signal types
IRT Communications
www.irtcommunications.com
Definition of CMI
CMI is a 2-level non-return-to-zero code in which binary 0 is coded so that both amplitude levels, A
attained consecutively, each for half a unit time interval (T/2).
Binary 1 is coded by either of the amplitude levels A
the level alternates for successive binary 1s.
An example is given in Figure A.1.
NOTE 1 – For binary 0, there is always a positive transition at the midpoint of the binary unit time
interval.
NOTE 2 – For binary 1:
a) there is a positive transition at the start of the binary unit time interval if in the preceding time interval
A
.
2
Binary
Level A
;
1
0
1
the level was
b) there is a negative transition at the start of the binary unit time interval if the last binary 1 was encoded
by level
A
or A2, for one full unit time interval (T), in such a way that
1
100 111
and A2, are
1
Level A1
T
2 T
2
T
T
Example of CMI coded binary signal
3020-dda.ib.rev0.doc
Page 7 of 17
09/03/2006
Description of operation
IRT Communications
www.irtcommunications.com
See block diagrams commencing on page 4 of this manual.
Input:
The 155 Mb/s G.703 (STM-1) input signal is connected to the input circuit of the amplifier.
If no power is present then the signal will be directed to the output connector via a relay, RL4. When power is
applied the relay operates and switches the signal via the amplifier to the second RL4 relay contact and the output
connectors.
In this power fail mode, the connection from input to output is passive and so only one output can be connected.
Active path:
Input switching & equaliser:
The signal from the RL4 relay connects to the input transformer and automatic line equalisation circuit. The purpose
of this equaliser is to restore both the signal level and the leading and trailing edges of the digital signal so that
signal jitter is not introduced when the clock signal is derived in the subsequent stage.
Logic processing, reclocking and AIS detection:
The main logic processing, reclocking, error detection and operational interfacing are all performed by logic circuits
within a custom-programmed large-scale logic array (FPGA). The internal logic and functions of this IC are too
complex to describe in detail and the following is intended as a guide to function only.
Data loss detection:
Valid data is deemed to be present at the module input when 120 or more data pulses have been received in 512
nominal clock periods. In order for the data pulse to be counted, more than 60% of the minimum anticipated data
pulse must be present.
If less than 120 data pulses are counted over a period of 512 clock pulses then the data signal is deemed to be
invalid and the data loss flag is set.
If the area of a given pulse is less than 60% of the minimum anticipated (or acceptable) data pulse, after line
equalisation and shaping, then that pulse is not considered as a valid input to the count.
In any of these cases the Data Loss LED on the front panel of the module will light and the general alarm relay
output will be activated connecting the general alarm output contact to ground.
AIS detection:
The data processor will detect an incoming AIS (Alarm Indication Signal) (a series of all 1’s in the payload of a
frame) and will set the AIS flag and the general alarm relay output will be activated connecting the general alarm
output contact to ground.
The AIS alarm system may be disabled by a link on the main board, LK 3. This prevents the AIS detection from
operating the automatic changeover function when used in handshake configuration and prevents AIS from setting
the general alarm output. The AIS detection circuit will, however, still provide AIS indication, on the front panel
LED, if AIS is detected.
The AIS disable link does not affect the general alarm being activated by data or signal loss as described above.
Power on reset:
When power is applied to the unit, a power on reset signal is generated. This signal causes the processing circuit to
examine its current status and connections and restore operation to its state prior to power failure.
If the DDA is connected for stand-alone operation all alarms will be reset and normal operation will resume. If an
AIS signal is present on the data input or data is outside the prescribed limits outlined above then the general alarm
will be activated after the normal detection period has elapsed from the P.O.R. signal being initiated.
Data signal output drivers.
Four separate output drivers drive the outputs, one of which goes via relay RL4 to O/P 3. In the event of a power
failure the input is passively switched to O/P 3.
Note that the Mon. Output on the front panel of the module is obtained in the same manner as the outputs on the rear
of the module.
3020-dda.ib.rev0.doc
Page 8 of 17
09/03/2006
Handshake operation:
IRT Communications
www.irtcommunications.com
Purpose:
Handshake interconnection is required when two circuits are to be operated in 1:1 protection switching mode to
provide a continuous signal output in the event of failure of the primary signal path.
Priority logic:
For this mode to be employed it is necessary to provide two programme feeds which are designated as the Main and
Standby paths.
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.
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 link LK 3)
Loss of power
In all of the above cases switching will only occur if:
the companion module is able to provide an output free of the same defects AND
the changeover inhibit switch is not activated on either module.
Connections:
Handshake interconnection should only be made using either the ZDA-3021RH handshake double rear assembly.
This rear assembly makes all the necessary connections for both logic and data signals when two DDA-3020’s are
inserted side by side in a 3 RU frame. Individual alarm outputs are provided for each module.
Logic connections:
All required logic connections are made by tracks on the double width PCB. Automatic operation is immediately
initiated when two modules are plugged into this type of rear assembly.
No external connections are required, but external alarm connections are available from each module for use if
desired. Additionally, each module has a connection for an external Make Main control for remote DA selection.
Handshake mode detection:
Two data lines are present on the handshake connector to indicate to each module that it is to operate in handshake
mode.
Power on reset.
When power is applied to the pair the power on reset signal will attempt to reset both modules. However, as only
one module can be Main, the logic processor checks for handshake operation and if detected then the module, which
was last enabled as Main will take control as Main and the other module will be forced to act as Reserve.
This memory capability is due to the latching nature of the RL1 relay, which will cause the Main and Reserve paths
to be maintained even in the absence of power.
The only exception to this rule is when power is applied to a pair for the first time that they are coupled in
handshake mode. In this special case both modules will initially have their K 3 relays in the active path condition
and so both will attempt to become Main. As the P.O.R. signal for each module will be slightly different for any two
modules, one will reach its operating mode first and will force the other module to immediately change to become
Reserve.
As the selection of which module becomes Main is cannot be determined before installation 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, on the front panel, lighting.
Automatic changeover:
An automatic changeover is initiated whenever the power fails on Main and not on Reserve or when a general alarm
is initiated on Main (indicating either loss of input signal or AIS indication if the AIS is enabled) and the Change
Inhibit switch is not active on either module.
Manual changeover:
A manual changeover is initiated by pressing the Change Request button on the front of the module that is required
to become Main.
The mechanism of the change is similar to the automatic changeover described above except that it is initiated by
the module requesting that it become Main.
3020-dda.ib.rev0.doc
Page 9 of 17
09/03/2006
Alarm and external changeover connections:
IRT Communications
www.irtcommunications.com
Two Krone type connectors (JP1 & JP2) are provided on the rear panel providing the following for each of the
modules:
Pin 1 Loss of power - connection to ground indicates module is in bypass mode.
2 General Alarm - connection to ground indicates a loss of input or AIS detection.
3 External changeover request - connection to ground will make this module Main in
handshake mode.
4 Ground.
A third Krone type connector (JP3) provides remote status of which unit is In Service (Main):
Pin T1 Connection to ground indicates that module 1 is the In Service (Main) module.
T2 Connection to ground indicates that module 2 is the In Service (Main) module.
T3 Not Connected.
T4 Ground.
3020-dda.ib.rev0.doc
Page 10 of 17
09/03/2006
Configuration
IRT Communications
www.irtcommunications.com
Link settings
LK1 IN Output disabled.
OUT Output enabled.
LK2 IN Transmit an Alarm Indication Signal (AIS) on loss of input signal.
OUT Do not transmit an Alarm Indication Signal (AIS) on loss of input signal.
LK3 IN Disable switching to Standby on detection of an Alarm Indication Signal (AIS).
OUT Enable switching to Standby on detection of an Alarm Indication Signal (AIS).
Switch settings
Sw1 Front panel push button. Change request to switch to In Service (Main) when used with ZDA-
Sw2 Front panel slide switch. Inhibit/Allow request to switch to In Service (Main), by either Sw1 or loss of
3021RH rear assembly.
signal, when used with ZDA-3021RH rear assembly.
3020-dda.ib.rev0.doc
Page 11 of 17
09/03/2006
Installation
IRT Communications
www.irtcommunications.com
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.
Signal Connections:
G.703 data connections - stand alone operation:
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.
G.703 data connections - handshake operation:
See separate section on handshake operation.
Alarm and external changeover connections:
A Krone type connector is provided on the rear panel of the module providing the following:
Pin 1 Loss of power - connection to ground indicates module is in bypass mode.
2 General Alarm - connection to ground indicates a loss of input or AIS detection.
3 External changeover request - connection to ground will make this module Main in
handshake mode.
4 Ground.
3020-dda.ib.rev0.doc
Page 12 of 17
09/03/2006
SNMP:
IRT Communications
www.irtcommunications.com
When used in an IRT FRU400 Frame with a CDM400 SNMP Module fitted, the DDA-3020 can be interrogated by
an SNMP Network Management System and certain functions can also be remotely controlled.
The MIB (management information base) associated with these devices has the following OIDs (Object Identities):
Alarms
In Service or Standby mode
State of Change-over enable switch
State of link that allows or disallows a change to Standby Status on
detection of incoming AIS
State of link that allows or disallows the transmission of AIS when
‘Input Loss’ is detected
Receive PLL locked (input signal present)
3020-dda.ib.rev0.doc
Page 13 of 17
09/03/2006
Front & rear panel connector diagrams
IRT Communications
www.irtcommunications.com
The following front panel and rear assembly drawings are not to scale and are intended to show connection order
and approximate layout only.
DDA-3020
MON.
CHANGE
DATA
LOSS
IN
SERVICE
INHIBIT
ALLOW
REQUEST
AIS
STANDBY
N140
SK 4
O/P 1
SK 3
O/P 4
JP1
1
2
3
4
SK 2
STM1 IN
1 PWR FAIL
2 GEN ALARM
3 CHANGE REQ
4 GND
DDA-3020
SK 7
O/P 2
SK 6
O/P 3
BYPASS
O/P 1
SK 8
O/P 2
SK 5
O/P 3
SK 6
ZDA-3021RH
4
3
2
1
JP1
T4
I/P 1
T3
O/P 4
SK 9
RL2
O/P 5
SK 7
4
RL1
3
2
1
I/P 2
JP2
SK 4
T2
SK 3
T1 R TALLY
T2 L TALLY
T3 N/C
T4 GND
JP3
T1
1 PWR FAIL
2 GEN ALARM
3 CHANGE REQ
4 GND
3020-dda.ib.rev0.doc
Page 14 of 17
09/03/2006
SNMP
IRT Communications
www.irtcommunications.com
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 NMSs must
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
3020-dda.ib.rev0.doc
SNMP Block Diagram
IP
Network
Page 15 of 17
SNMP Agent
Protocol Engine
SNMP Agent
Protocol Engine
SNMP Agent
Protocol Engine
09/03/2006
MIB
MIB
MIB
SNMP Agent
SNMP Agent
SNMP Agent
SNMP with IRT Products
p
IRT Communications
www.irtcommunications.com
IRT Electronics currently employs SNMPv1 with its 4000 series frame. The frame acts as an agent when fitted with
a CDM-4000 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-4000 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-4000 agent via a data bus on the rear of the frame. Thus the
CDM-4000 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-4000 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
110/240 V 50/60 Hz
0.7 A (max.)
FRAME
FUSES
220/240 Vac
500 mA S.B.
110/1 20 Vac
1A S.B.
RS232
Ethernet
AS3260 approval no.: CS6346N
Ass. no.: 80469 2
Alarm
+
48Vdc
-
IRT SNMP Connections
NMS
Ethernet Cable
Network
IRT modules fitted
with SMU-4000
IRT 4000 Series Frame
Ethernet Cable
IRT modules fitted
with SMU-4000
CDM-4000
PSU’s
CDM-4000
PSU’s
3020-dda.ib.rev0.doc
IRT 4000 Series SNMP Setu
Page 16 of 17
09/03/2006
IRT 4000 Series Frame
Ethernet Cable
Maintenance & storage
IRT Communications
www.irtcommunications.com
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. A contact 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: 61 2 9439 3744 Fax: 61 2 9439 7439
Email: service@irtelectronics.com
3020-dda.ib.rev0.doc
Page 17 of 17
09/03/2006
Loading...