IRT Communications DDT-4638 User manual

DDT-4638 & DDR-4638
I.R. T. Communications Pty L t d | www .i rtcommunication s. c o m
Revision 01
8-Channel HD/SD-SDI/ASI Fibre Optic Link
User Manual

DDT-4638 & DDR-4638
I.R.
T. Communications Pty L t d | www .i rtcommunication s. c o m
Page 2 of 17 Revision 01
8-Channel HD/SD-SDI/ASI Fibre Op ic Link
Revision His ory:
Revision Da e By Change Descrip ion Applicable o:
110/6/2021 First published on web site

DDT-4638 & DDR-4638
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Page 3 of 17 Revision 01
USER MANUAL
Table of Con en s:
Sec ion Page
Revision History 2
Operational Safety 4
Block Diagram 5
eneral Description 6
Technical Specifications 7
Configuration 8
Installation 10
Signal Connections 10
Front and rear layouts 11
Operation 12
SNMP – What Is It? 13
SNMP Functions 15
DDT-4638 15
DDR-4638 16
Maintenance & Storage 17
Warranty & Service 17

DDT-4638 & DDR-4638
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Page 4 of 17 Revision 01
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.
Op ical Safe y
The light emitted from the LASER diode used in this system is
invisible and may be harmful to the human eye. Avoid looking
directly into the fibre optic cable or connectors or into the
collimated beam along their axis when the device is in operation.
Operating the LASER diode outside of its maximum ratings may
cause device failure or a safety hazard.
DANGER
Avoid direct exposure to beam
Peak power 2 mW
Wavelength 1270–1610nm
Class 1 LASER Product
Invisible LASER radiation-

DDT-4638 & DDR-4638
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GENERAL DESCRIPTION
BLOCK DIAGRAM DDT-4638 & DDR-4638 SIGNAL PATH
BLOCK DIAGRAM DTR-4638/4TX+4RX & DTR-4638/4RX+4TX SIGNAL PATH
BLOCK DIAGRAM DTR-4638/6TX+2RX & DTR-4638/2RX+6TX SIGNAL PATH
(8x)
HD-SDI
SD-SDI
ASI Fibre Link
DDT-4638
(4TX + 4RX)
I/P 1
I/P 2
I/P 3
I/P 4
Fibre O/P
O/P 5
O/P 6
O/P 7
O/P 8
DDR-4638
(4RX + 4TX)
O/P 1
O/P 2
O/P 3
O/P 4
Fibre I/P
I/P 5
I/P 6
I/P 7
I/P 8
(8x)
HD-SDI
SD-SDI
ASI
(8x)
HD-SDI
SD-SDI
ASI Fibre Link
DDT-4638
(8TX)
I/P 1
I/P 2
I/P 3
I/P 4
Fibre O/P
I/P 5
I/P 6
I/P 7
I/P 8
DDR-4638
(8RX)
O/P 1
O/P 2
O/P 3
O/P 4
Fibre I/P
O/P 5
O/P 6
O/P 7
O/P 8
(8x)
HD-SDI
SD-SDI
ASI
(8x)
HD-SDI
SD-SDI
ASI
Fibre Link
DDT-4638
(6TX + 2RX)
I/P 1
I/P 2
I/P 3
I/P 4
Fibre O/P
I/P 5
I/P 6
O/P 7
O/P 8
DDR-4638
(2RX + 6TX)
O/P 1
O/P 2
O/P 3
O/P 4
Fibre I/P
O/P 5
O/P 6
I/P 7
I/P 8
(8x)
HD-SDI
SD-SDI
ASI

DDT-4638 & DDR-4638
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Page 6 of 17 Revision 01
GENERAL DESCRIPTION
The DDT-4638, DDR-4638 & DTR-4638 are 8 channel modules designed principally for use as eight serial data fibre
optic transmission links on a single fibre for HD SDI or SD SDI applications conforming to SMPTE standards 424M,
292M and 259M-C using 9/125 μm single mode fibre. This enables the use of space saving fibre optic cable for
reliable transmission of digital video signals over lengths greater than can be achieved with coaxial cable.
In addition, the links may be used for ASI transport streams for use with MPE compressed video streams or other
270 Mb/s type data.
The receivers use either PIN or APD detectors with signal conditioning and reclocking circuits. The data rates are
automatically set to match the HD SDI or SD SDI/ASI rates dependent on the actual input data rates to the
transmitters. A PIN detector version is also available for short run applications.
The modules are compatible with IRT’s single channel fibre cards for use as eight independent fibre paths starting
from or coming to a single location when used in conjunction with an external 8 channel CWDM optical
combiner/de-combiner.
SNMP (Simple Network Management Protocol) is available for monitoring and control when used in an IRT frame
fitted with SNMP capability.
The DDT-4638 and DDR-4638 are Eurocard modules designed to fit IRT’s current range of standard Eurocard frames
and may be used alongside any other of IRT’s analogue or digital Eurocards.
S andard fea ures:
• Transpor s up o 8 independen HD-SDI, SD-SDI or ASI signal ra es on a single fibre via an on-
board CWDM op ical combiner..
• Transpor s 1.485 Mb/s HD-SDI or 270 Mb/s SD-SDI & ASI signals.
• Ho pluggable fibre connec ions.
• Pa h leng hs up o 5 o 24 dB op ical pa h loss using 9/125μm single mode fibre and APD
receivers.
• Pa h leng hs 0-17dB for PIN receivers.
• The DTR-4638 can be fac ory configured as ei her 8Tx, 8Rx, 4Tx+4Rx, 4Rx+4Tx, 6Tx+2Rx or
6Rx+2Tx.
• OLED fron panel display and ex ernal alarm con ac s.
• Remo e moni oring via SNMP.

DDT-4638 & DDR-4638
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Page 7 of 17 Revision 01
TECHNICAL SPECIFICATIONS
DDT-4638:
Inpu serial da a signal 1.485 b/s (HD-SDI) to SMPTE 292M;
270 Mb/s (SD-SDI) to SMPTE 259M and DVB-ASI.
Inpu impedance 75 Ω.
Inpu re urn loss > 15 dB 5 MHz to 1.5 Hz
Au oma ic Cable compensa ion > 30 m at 1.485 b/s with Belden 1694A (typ. 170m);
> 50 m at 270 Mb/s with Belden 8281 (typ. > 300m).
Inpu Connec or 8 (1 per channel), BNC on rear panel.
DDR-4638:
Number of ou pu s 8 (1 per channel) data reclocked,
AC coupled.
Ou pu level 800 mV ± 10%.
Ou pu impedance 75 Ω.
Ou pu re urn loss > 15 dB 5 MHz to 1.5 Hz
Ou pu Rise and Fall Time < 135 ps at 2.97 b/s and 1.485 b/s;
> 0.4 ns and < 1.5 ns at 270 Mb/s.
In rinsic Ji er < 0.2 UI at 1.485 b/s reclocked;
< 0.2 UI at 270 Mb/s reclocked (typically < 0.1 UI).
Ou pu Connec or 8 (1 per channel), BNC on rear assembly.
Op ical:
DDT-4638 op ical ou pu 0 dBm +4.5/-0 dB CWDM DFB laser.
DDR-4638 op ical inpu APD detector, -5 to -24 dBm input level
PIN detector, <-14 dBm input level.
Op ical aveleng hs CWDM DFB laser - 1610nm, 1590nm, 1570nm 1550nm,
1530nm, 1510nm, 1490nm & 1470nm.
Op ical pa h loss
1
APD detector 5 to 24 dB, typically > 27 dB
PIN detector <14 dB, typically >18 dB
(Optical path loss = Laser O/P power – Detector I/P power)
Op ical fibre Designed for use with 9/125 µm single mode fibre.
Op ical connec ors 1, SC/PC on rear assembly.
Power Requiremen s:
Vol age 28 Vac CT (14-0-14) or ±16 Vdc.
Power consump ion <6.0 VA
O her:
Tempera ure range 0 - 50° C ambient.
Mechanical For mounting in IRT 19" rack chassis with input, output and power
connections on the rear panel.
Finish Fron panel rey 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.
Op ional accessories SMU-4000 SNMP plug in module for use with 4000 series frame fitted with
SNMP “Agent”.
NOTE: 1 Typical values based using DFB laser. Optical attenuator required for
DDR-4638 when optical path loss is less than 9dB for APD detector.
Due to our policy of continuing development, these specifications are subject to change without notice.

DDT-4638 & DDR-4638
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Page 8 of 17 Revision 01
CONFIGURATION
DIP swi ch se ings:
DDT/R-4638:
CHANNEL 1-8
DATA RATE SW1-1 SW1-2
Any Ra e OFF OFF
SD-SDI / ASI ON OFF
HD-SDI, SD-SDI / ASI OFF ON
Bypass Reclocker ON ON
SW1-3 OFF Enable major and minor SNMP alarms to the frame Agent (CDM card)
2
.
ON Disable major and minor SNMP alarms to the frame Agent (CDM card)
2
.
SW1-4 OFF Enable SNMP control.
ON Enable DIP switch control.
SW1-5 OFF Auto
ON Manual
SW1-6 Not Used.
SW1-7 Not Used.
SW1-8 Not Used.
NOTE: 2 When using TRAPS via SNMP, depending on how system is set up, in order to avoid double reporting of
alarms via the DDT-4620 and DDR-4620 cards themselves and the CDM card (SNMP Agent) of the
frame, major and minor SNMP alarms that are reported to the CDM card of the frame can be disabled.
SW2-1 OFF Channel 1 Transmitter (BNC Input)
ON Channel 1 Receiver (BNC Output)
SW2-2 OFF Channel 2 Transmitter (BNC Input)
ON Channel 2 Receiver (BNC Output)
SW2-3 OFF Channel 3 Transmitter (BNC Input)
ON Channel 3 Receiver (BNC Output)
SW2-4 OFF Channel 4 Transmitter (BNC Input)
ON Channel 4 Receiver (BNC Output)
SW2-5 OFF Channel 5 Transmitter (BNC Input)
ON Channel 5 Receiver (BNC Output)
SW2-6 OFF Channel 6 Transmitter (BNC Input)
ON Channel 6 Receiver (BNC Output)
SW2-7 OFF Channel 7 Transmitter (BNC Input)
ON Channel 7 Receiver (BNC Output)
SW2-8 OFF Channel 8 Transmitter (BNC Input)
ON Channel 8 Receiver (BNC Output)
NOTE: Only active when DIP1-5 is ON
1 2 3 4 5 6 7 8
ON
DIP
SW2
1 2 3 4 5 6 7 8
ON
DIP
SW1

DDT-4638 & DDR-4638
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SW3-1 OFF Channel 8 Optical Transmitter Disabled (only for SFP lasers)
ON Channel 8 Optical Transmitter Enabled (only for SFP lasers)
SW3-2 OFF Channel 7 Optical Transmitter Disabled (only for SFP lasers)
ON Channel 7 Optical Transmitter Enabled (only for SFP lasers)
SW3-3 OFF Channel 6 Optical Transmitter Disabled (only for SFP lasers)
ON Channel 6 Optical Transmitter Enabled (only for SFP lasers)
SW3-4 OFF Channel 5 Optical Transmitter Disabled (only for SFP lasers)
ON Channel 5 Optical Transmitter Enabled (only for SFP lasers)
SW3-5 OFF Channel 4 Optical Transmitter Disabled (only for SFP lasers)
ON Channel 4 Optical Transmitter Enabled (only for SFP lasers)
SW3-6 OFF Channel 3 Optical Transmitter Disabled (only for SFP lasers)
ON Channel 3 Optical Transmitter Enabled (only for SFP lasers)
SW3-7 OFF Channel 2 Optical Transmitter Disabled (only for SFP lasers)
ON Channel 2 Optical Transmitter Enabled (only for SFP lasers)
SW3-8 OFF Channel 1 Optical Transmitter Disabled (only for SFP lasers)
ON Channel 1 Optical Transmitter Enabled (only for SFP lasers)
NOTE: Active irrespective of DIP1-5
For units with lasers, the OLED front panel display will indicate a small laser power bar graph for
each laser wavelength and display “disabled” if a particular channel has been disabled
1 2 3 4 5 6 7 8
ON
DIP
SW3

DDT-4638 & DDR-4638
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Page 10 of 17 Revision 01
2 MAJOR ALARM
3 MINOR ALARM
1 Gnd
INSTALLATION
Pre-ins alla ion:
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.
Ear hing:
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 ear h: For safety reasons a connection is made between signal earth and chassis earth.
No attempt should be made to break this connection.
Ins alla ion in frame or chassis:
See details in separate manual for selected frame type.
Signal Connec ions:
The DDT-4638 and DDR-4638 are set up to automatically or manually operate at either HD-SDI or SD-SDI / ASI
signal rates and do not require any adjustment prior to use, with the exception the DIP switch options described in
the Configuration section of this manual. There are no external controls on the front panel of the units.
Optical connections are made via the SC/PC optical connector mounted on the rear of the modules. Care must be
taken to provide a clean surface on the optical connectors. Type of fibre used must be single mode type.
The serial digital signal connections are made to the BNC connectors on the rear panels.
External alarm contact connections to the DDT/R-4638 are made to the 3 pin phoenix style connector at the top of
the rear assembly. On an alarm condition relay contacts go open circuit, that is switch open with respect to
ground, when the input optical signal level is low or not present.
The connections being:

DDT-4638 & DDR-4638
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Page 11 of 17 Revision 01
Fron & rear panel connec or diagrams :
Rear Assembly for
For both DDT-4638 & DDR-4638
Alarms
nd
Major
Minor
Channel - 8
Channel – 7
Channel - 6
Channel – 5
Channel - 3
Channel – 4
Channel - 1
Channel – 2

DDT-4638 & DDR-4638
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OPERATION
The DDT-4638 and DDR-4638 are set up to operate either automatically or at fixed rates corresponding to HD-SDI or
SD-SDI (or ASI) rates.
Up to eight independent HD-SDI, SD-SDI or ASI signals are connected to the eight 75 Ω BNC connectors on the rear
assembly of the DDT-4638 fibre optic transmitter. Front panel OLED display indicates the presence and rate of valid
input signals.
The system will operate with an optical path loss from 5dB to a maximum of 24dB (Typically >26dB) when fitted
with an APD detectors, and from 0dB to a maximum of 14dB (Typically >18dB) when fitted with a PIN detectors.
For path lengths <9dB optical loss when using an APD detector an optical attenuator is required. The length of fibre
that this corresponds to depends on the fibre loss characteristics at the relevant wavelength of the laser module
chosen. For example, if the fibre loss characteristic of the chosen fibre is 0.2dB per kilometre at 1550 nm, say, then
the maximum distance that can be run is 100 km (20dB/0.2dBkm
-1
), although connector losses, such as through
patch leads etc., should also be taken into consideration when calculating maximum distances. Actual attenuation
versus wavelength characteristics depends upon optic fibre manufacturer’s own specifications.
For each channel, both at the transmitter and receiver, the front panel OLED display shows the rate and optical
power. Optical power at the transmitter will be high unless the laser channel has been disabled. The optical power
at the receiver uses a three level bar graph. All three bars is good, two bars indictae amount of path loss. One bar is
low optical level and no bars indicates optical loss.
Major and minor alarms are available on the rear assembly. An alarm is indicated if the alarm is not grounded
which also raises an alarm if module looses power. A major alarm is associated with the optical issues and in the
DDT-4638 the alarm is raised when any laser fails or for the DDR-4638 if any input optical wavelength is lost. The
minor alarm is for the presence of channel data. For the DDT-4638 a minor alarm is indicated when any cable input
is lost or for the DDR-4638 if any channel is lost.

DDT-4638 & DDR-4638
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Page 13 of 17 Revision 01
SNMP
Wha Is I ?
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 I.R.T. Communications 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 NMS’s
must exist on any managed network. enerally 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 NMS’s 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.
SNMP Block Diagram
NMS
NMS
IP
Network
SNMP Agent
SNMP Agent
Protocol Engine MIB
SNMP Agent
SNMP Agent
Protocol Engine MIB
SNMP Agent
SNMP Agent
Protocol Engine MIB

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Page 14 of 17 Revision 01
SNMP wi h IRT Produc s:
I.R.T. Communications 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 I.R.T.
Communications.
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 may need an optional plug-in SNMP 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 Connec ions
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
Ethernet Cable
Ethernet Cable
Ethernet Cable
NMS
IRT SNMP Se up
IP
Ne work

DDT-4638 & DDR-4638
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Page 15 of 17 Revision 01
DDT-4638 & DDR-4638 SNMP Func ions:
With the DDT-4638 and DDR-4638 installed in an IRT frame with SNMP capability, these can be interrogated by an
SNMP Network Management System (NMS).
The following SNMP functions are capable of being monitored and controlled
3
by an NMS:
DDT-4638:
alarms - An indication of the state of alarm,
(1) noAlarms: No alarms present.
(2) UrgentAlarm: Corresponds to a laser failure.
con rolSource - An indication of the source for board control settings,
(1) localDIPsw: DIP switch control (SW1-4 ON).
(2) remoteSNMP: SNMP control (SW1-4 OFF).
channelInfoTable - Information on each input in table form:
channelNumber - Input channel number (1, to 8).
channelPresen - An indication that the channel input signal is present or not:
(1) notPresent: No input signal present on channel.
(2) present: Input signal is present on channel.
channelWaveleng h - An indication of the channel laser wavelength.
channelAlias - A 15 byte maximum Alias (name) for the channel can be read and set.
channelTrapEnable - Trap automatically sent, if enabled, when a channel is first present and when it is first absent.
(1) notEnabled.
(2) enabled.
fpgaVersion - The firmware version of the main FP A (if fitted) in the format ‘x.y’, where x is the major
revision number and y the minor.
sof wareVersion - The software version of the main FP A in the format ‘x.y’, where x is the major revision
number and y the minor.
rese - Unit reset control. A set with a value of 2 sent to this OID will cause a system reset to
occur. When queried returns a 1.
NOTE: 3 For SNMP control, DIP switch SW1-4 of the relevant card must be in the OFF position.

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Page 16 of 17 Revision 01
DDR-4638:
c rlMode - An indication of the source for board control settings,
(1) remoteSNMP: SNMP control (SW1-4 OFF).
(2) pcbSwitches: DIP switch control (SW1-4 ON).
channelTable - Information on each input in table form:
channelNumber - Input channel number (1, to 8).
s a us - An indication of the channel status:
(1) unlocked: Reclocker cannot lock to the channel signal data rate, or no signal actually
exists on the channel.
(2) locked270Mbps: Signal present on channel is locked to the 270Mb/s rate (such as
SD-SDI or ASI).
(3) lockedSDI-HD: Signal present on channel is locked to the HD-SDI rate.
(4) lockedSDI-3 : Signal present on channel is locked to the 3 -SDI rate.
op icalRx - An indication of the received optical input power (±3dBm accuracy).
da aRa e - An indication, and setting, of the channel data rate reclocker.
(1) autoDetect: The reclocker is automatically set to what the signal data rate is (3 , HD
or SD data rate).
(2) mbps270: The reclocker is set to lock at 270Mb/s rate to suit SD-SDI or ASI types of signals.
(3) sdi-HD: The reclocker is set to lock at the HD-SDI rate.
(4) sdi-3 : The reclocker is set to lock at the 3D-SDI rate.
reclocker - An indication, and setting, of whether the reclocker is enabled or not.
(1) enabled: The reclocker is enabled so as to lock to 3 , HD or SD data rates,
dependent on the ‘dataRate’ setting.
(2) bypassed: The reclocker is bypassed.
channelAlias - A 15 byte maximum Alias (name) for the channel can be read and set.
s a usTrapEnable - Trap automatically sent, if enabled, when a channel status changes.
(1) disabled.
(2) enabled.
fpgaVersion - The firmware version of the main FP A (if fitted) in the format ‘x.y’, where x is the major
revision number and y the minor.
sof wareVersion - The software version of the Microcontroller in the format ‘x.y’, where x is the major
revision number and y the minor.
rese - Unit reset control. A set with a value of 2 sent to this OID will cause a system reset to
occur. When queried returns a 1.

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Page 17 of 17 Revision 01
MAINTENANCE & STORAGE
Main enance:
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.
S orage:
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 Faul 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.
Equipmen re urn:
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 Faul 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 o he agen who originally supplied he equipmen or, where this is not
possible, to IRT directly. Details of IRT’s direct address can be found at I.R.T. Communications’ website.
Web address: www.irtcommunications.com
Email: [email protected]