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3004-dva.ib.doc Page 1 of 9 16/07/2002
IRT Eurocard Type
DVA-3004
Serial Digital 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: (02) 9439
3744 Fax: (02) 9439 7439 International: +61 2 9439 3744 +61 2 9439
7439 Email: [email protected] Web:
www.irtelectronics.com
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3004-dva.ib.doc Page 2 of 9 16/07/2002
DVA-3004
Serial Digital Distribution Amplifier
Instruction Manual
Table of Contents
Section Page
Operational Safety 2 General Description 3
Functional Block Diagram 3 Applications 3 Specifications 4
Cicuit Description 5 Installation 6
Front & rear panel diagrams 7 Maintenance & Storage 8
Warranty and Service 8
Equipment return Error! Bookmark not defined. Drawing List Index
9
This instruction manual applies to DVA-3004 assembly 804413
units later than S/N 0203001
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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3004-dva.ib.doc Page 3 of 9 16/07/2002
General Description The IRT DVA-3004 is a one in six out
reclocking distribution amplifiers for SMPTE/EBU and ASI serial
digital video signals with all output signals in phase with the
input signal, an added feature is a bypass circuit which will
switch the input circuit to output connector number 1 when the
power supply of the unit is not present. The units feature an input
circuit with automatic cable equalisation for Belden 8281 or PFS1/2
coaxial cable and cable driver circuits for seven individually
sourced outputs, six to the rear connector panel and one for
monitoring on the front panel. In addition the DVA-3004 allows the
signal to be inverted if required by operation of a front panel
slide switch to select an inverted signal in the signal path from
the input equaliser circuit. Alarm circuits are provided which will
provide remote monitoring of loss of the signal or the power supply
via a grounding relay contact, and a indication of the operation of
the signal inversion circuit by means of a grounding open collector
transistor circuit. The DVA-3004 is built in 3U extended Eurocard
220 mm x 100 mm module designed to mount in the IRT FRU-3000 and
FRU-1030 family of Eurocard frames. Functional Block Diagram
Applications The DVA-3004 is intended to be used where ASI or
SDI serial digital signals may be present and multiple signal
outputs are required from equipment with only one output and to
provide input cable equalisation for devices not having this
feature as most unequalised inputs will only support short input
signal cable lengths. In 270 Mb/s ASI signal circuits the DVA-3004
will provide the required in phase outputs needed to preserve the
ASI signal and provide the means of inverting the signal if other
equipment in the line cause a inversion of the signal. The input
connector to output connector 1 bypass feature can preserve one
main signal path in the event of power failure. Alarm circuits are
provided for external monitoring of the state of the signal
inversion circuit and the power fail/signal present circuit.
O/P 1
O/P 2
O/P 3
O/P 4
O/P 5
O/P 6
MON O/P
OUTPUTSRL1-2RELAY
RECLOCKING
EQUALISER DATARECOVERY
DATA FAILDETECTION
RL1-1RELAY
INPUT
+V
INVERTSIGNAL
Relay RL 1 = Power Fail Bypass
Relay RL 2 = Output Alarm
ALARM O/P
LINKRL 2
BLOCK DIAGRAM DVA-3004 SIGNAL PATH
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3004-dva.ib.doc Page 4 of 9 16/07/2002
Technical specifications
DVA-3004 Input: Number 1. Impedance 75 Ohm. Return loss >15
dB 5 MHz to 360 MHz. Outputs: Number 7. Signal level 800 mV ± 10%
Impedance 75 Ohm. Return loss >15 dB 5 MHz to 360 MHz. DC offset
Nil. Performance: Cable compensation Automatic, better than 300
metres at 270 Mb/s for Belden 8281 or equivalent cable. Output rise
time
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3004-dva.ib.doc Page 5 of 9 16/07/2002
Circuit Description The input circuit again consists of U1 a
CLC014 adaptive cable equaliser IC, which automatically adapts to
equalise any cable length from zero metres to lengths that
attenuate the signal by 40dB at 200MHz. This corresponds to 300
metres of Belden 8281 cable. A carrier detect and output mute
circuit in the CLC014 is used to mute the output when no signal is
present. The CLC014 is insensitive to the pathological patterns
that can be present in the serial digital video signal. The output
of the CLC014 input stage is coupled to U2 a ECL multiplexer which
can be switched to select a normal or inverted signal stream to U3
a CLC016 data re-timing PLL with automatic rate selection. The
CLC016 is set up for manual rate selection of the serial data rates
of 270 and 360 Mb/s using links LK3 and LK4. As with (the CLC014
input stage) the carrier detect and mute circuit of U2 is used to
mute the output when no signal is present. U3 the CLC016 has a low
residual output jitter of less than 170 ps p-p at 270 Mb/s and is
insensitive to the pathological patterns that can be present in the
serial digital video signal. The output of the CLC016 re-timing
stage is coupled to CLC007 cable driver circuits U4,U5,U6 and U7 to
provide the seven isolated outputs from the DVA-3004. A relay RL1
wired in a change-over configuration is wired in the input signal
path and the signal path to output 1 on the rear panel, with this
relay energised by the +5 volts supply the input and output
circuits are completed to provide normal operation of the DVA-3004.
When +5 volts supply is not present the relay will switch the input
signal to output 1 on the rear panel to provide a fail safe circuit
for the signal. Note the cable driver outputs are wired so that all
outputs are in phase with the input signal of the DVA-3004 when the
front panel slide switch is in the NORMAL position. IC U8 provides
the necessary LED drivers and logic to decode the rate detection
indications from U3. LED LD5 is used to indicate the state of the
carrier detect circuit, indicating the presence of signal to the
re-timing IC U3, and LED’s LD3 and LD2 are used to indicate PLL
rate of 270 Mb/s or 360 Mb/s signal by U3. Monitoring circuits are
provided to indicate loss of signal or power to the unit and the
state of the signal inversion circuit of the DVA-3004. Monitoring
of loss of signal or power this is done by a relay RL2 which is
energised when signal is detected by the reclocking IC U3, the
relay contact is set by LK2 to provide a contact closure to ground
on failure. The state of the front panel switch is monitored by U9
a opto-isolator circuit whose output is a npn transistor with the
emitter grounded, this transistor will be switched to ground when
the signal inversion switch is switched to INVERT. The dual AC
inputs are rectified by D1 to D4, and then regulated in a LM2575-5
switch mode regulator circuit U10 to provide the +5V operating
voltage for the unit.
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3004-dva.ib.doc Page 6 of 9 16/07/2002
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. Ensure that
the front panel slide switch is in the NORMAL position for correct
operation with ASI signals. LK3 and LK4 set the PLL lock frequency
of U3. LK3 is used to switch between 270 Mb/s (link closed) and 360
Mb/s (link open). LK4 is not fitted, it may be fitted if operation
at 143 Mb/s or 177 Mb/s if desired.
LK3 LK4 RATE SELECTED Closed Open 270 Mb/s Open Open 360 Mb/s
Closed Closed 143 Mb/s Open Closed 177 Mb/s
Link LK2 sets the operation of RL2 contact set, the position
closest to the board edge is the normally closed position which
will give a contact closure to ground on a signal or power failure,
this is the preferred position for common alarm circuits from a
number of units. The presence of the internal +5 Vdc supply is
indicated by the front panel LED (green).
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3004-dva.ib.doc Page 7 of 9 16/07/2002
Front & rear panel diagrams The following front panel and
rear assembly drawings are not to scale and are intended to show
relative positions of connectors, indicators and controls only.
DC
360 INV
270 SIG
DVA-3004
N140
OUTPUT MON
INVERT
NORMAL
J1
SK8
BYPA
SS O
N P
OW
ER F
AIL
O/P5
O/P3
O/P1
O/P6
OUTPUTS
OUTPUTS
12
1=GND2=SIGNAL/POWER LOSS
3
3=SIGNAL INVERSION
O/P2
DVA-3004
INPUT
O/P4
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3004-dva.ib.doc Page 8 of 9 16/07/2002
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 $A100.00 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 $A100.00
will apply, whether
the equipment is within the warranty period or not. 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: [email protected]
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3004-dva.ib.doc Page 9 of 9 16/07/2002
Drawing List Index Drawing # Sheet # Description 804413 1
DVA-3004 serial digital VDA schematic diagram. 804413 2 DVA-3004
serial digital VDA schematic diagram. 804413 3 DVA-3004 serial
digital VDA schematic diagram.
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1A 1B 2A 2B 3A 3B 4A 4B 5A 6A 6B 7A 7B 8A 8B 10A
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-
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