IRT DDA-3010 User manual

3010-dda.ib.rev1.doc Page 1 of 10 05/07/2006
IRT Eurocard Type
DDA-3010
140/155 Mb/s G.703 6 O/P
Reclocking 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: [e-mail]
Web: www.irtelectronics.com

3010-dda.ib.rev1.doc Page 2 of 10 05/07/2006
DDA-3010
140/155 Mb/s G.703 6 O/P
Reclocking Distribution Amplifier
Instruction Manual
Table of Contents
Section Page
Operational safety 2
Description 3
Specifications 4
Electrical characteristics of signal 5
Technical Description 6
Installation 7
Front & rear panel connector diagrams 8
Maintenance & storage 9
Warranty and service 9
Equipment return 9
Drawing index 10
This instruction manual applies to DDA-3010 later than S/N 0401001
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.

3010-dda.ib.rev1.doc Page 3 of 10 05/07/2006
Description
The IRT DDA-3010 is a single input, six out 140/155 Mb/s data distribution amplifier whose input and outputs
comply with ITU Rec. G.703.
Due to the fact that standard loop through techniques used in the analogue domain are unsuitable to the digital
domain most digital equipment comes with no facility to route the input signal to other locations. As a result a DDA
is required at almost every point in the digital chain.
Serial digital signals also suffer severe deterioration over relatively short cable distances. The DDA-3010 provides a
means of extending the working distances that can be achieved by equalising, reclocking and re-transmitting the data
mid route.
The DDA-3010 provides input cable equalisation and reclocking of the serial digital signal, muting of the output
signal when no input signal is applied and external alarm contacts on loss of signal or loss of lock and loss of the
power supply.
Six individually sourced outputs are provided at the rear of the module and a monitoring port is provided on the front
panel. In the event of a power failure, a bypass relay automatically switches the input signal to output 1.
Indicators are provided on the front panel for: Signal present.
155 Mb/s operation.
140 Mb/s operation.
Power on.
The DDA-3010 may be mounted in IRT’s 1 RU or 3 RU frames with other analogue or digital modules.
Standard features:
• Input and output connections on the rear panel.
• Automatic input equalisation to 250 metres.
• Data regeneration & re-clocking.
• Automatic output muting on no input.
• External alarms.
• Front panel indicators provide monitoring of presence of input signal.
• Front panel indication of link selection of operating rate 140 Mb/s or 155 Mb/s.
O/P 1
O/P 2
O/P 3
O/P 4
O/P 5
O/P 6
MON O/P
OUTPUTS
EQUALISER
RECLOCKING
SIGNAL FAIL
DETECTION
INPUT
Relay RL 2 = Power Loss Alarm
Link LK1
SIGNAL FAIL
ALARM O/P
RL 1
BLOCK DIAGRAM DDA-3010 SIGNAL PATH
RL1
Link LK2
POWER LOSS
ALARM O/P
RL 2
Power Loss Bypass Relay
Relay RL 1 = Signal Fail Alarm
(Loss of Lock, Loss of Signal)
Link LK4
140/155 Mb/s
Select

3010-dda.ib.rev1.doc Page 4 of 10 05/07/2006
Technical Specifications
DDA-3010
140/155 Mbits/s data (link selectable):
Input:
Type AC coupled.
Impedance 75 Ωterminated.
Electrical characteristics to ITU-T Rec. G.703 interface at 139,264 kbit/s or 155.520 kbit/s, link selectable,
(see below).
Outputs:
Type AC coupled.
Number 6 regenerated data located on rear connection assembly.
Impedance 75 Ωsource terminated.
Electrical characteristics to ITU-T Rec. G.703 interface at 139,264 kbit/s or 155.520 kbit/s, link selectable,
(see below).
Performance:
Cable Equalisation Automatic, better than 250 metres for Belden 8281 or equivalent cable.
Jitter Tolerance As per ITU-T Rec. G.823 Table 2.
Connectors: Data: BNC 75 Ω.
Alarm: Krone LSA plus.
Indicators:
Power LED (green) for +5V.
Signal present LED (green).
155 Mb/s operation LED (green).
140 Mb/s LED (yellow).
Alarm signal:
Power Loss Alarm N/O or N/C, link selectable, relay contact closure to ground on power failure.
Signal Failure Alarm N/O or N/C, link selectable, relay contact closure to ground on loss of input signal or
loss of signal lock.
Power Requirements:
Voltage 28 Vac CT (14-0-14) or ±16 Vdc.
Power consumption 3 VA (< 107 mA).
Other:
Temperature range 0 - 50° C ambient
Mechanical Suitable for mounting in IRT 19" rack chassis 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 DDA-3010 rear connector assembly (supplied with module).
Optional accessory Instruction manual.
Due to our policy of continuing development, these specifications are subject to change without notice.

3010-dda.ib.rev1.doc Page 5 of 10 05/07/2006
Electrical characteristics of signal:
CMI coded binary signal - to ITU-T Rec G.703
Test load impedance 75 Ohms resistive.
Nominal peak to peak 1.0 ±0.1 V.
Rise time between 10% and 90% amplitudes
of the measured steady state amplitude < 2 ns.
Transition timing tolerance (referred to the Negative transitions: ±0.1 ns.
mean value of the 50% amplitude points of Positive transitions at unit interval boundaries: ±0.5 ns.
negative transitions) Positive transitions at mid-intervals: ±0.35 ns.
Input return loss > 15 dB over the frequency range 7 MHz to 210 MHz.
Output return loss > 15 dB over the frequency range 7 MHz to 210 MHz.

3010-dda.ib.rev1.doc Page 6 of 10 05/07/2006
Technical Description
The input circuit of the DDA-3010 consists of an adaptive cable equaliser IC, which automatically adapts to equalise
any cable length from zero metres to lengths that attenuate the signal by 40 dB at 200 MHz. This corresponds to
300 metres of Belden 8281 cable. A carrier detect and output mute circuit is used to mute the output when no signal
is present.
The DDA-3010 also features an OUTPUT MONITOR point on the front panel. The output monitor is an isolated
copy of the signal present at the rear panel outputs.
The output of the input stage is coupled to a reclocking circuit, which then feeds cable driver circuits to provide the
six isolated in phase outputs from the DDA-3010.
The input cable equaliser and reclocking circuits incorporate carrier detection circuits to mute the output when no
signal is applied to the unit. The carrier detect signal and lock signal of the reclocker are used to energise relay, RL1
via a transistor, Q1, when locked carrier is present. A second relay, RL2, de-energises on loss of power to give a
separate alarm for loss of power. The relay contacts are connected to SK10 on the rear panel to give a failure alarm
in the form of a make (or break) to ground on failure as set by a links LK1 and LK2, respectively, on the circuit
board.
The dual AC inputs are rectified and then regulated by a switch mode regulator circuit to provide the +5V operating
voltage for the unit.
+5Vdc is fed to pin 32a of the rear Euro-connector via a polyfuse, F5. The +5V is to provide power for a signal
bypass relay rear assembly. The polyfuse protects the +5V power rail by going high impedance should pin 32a be
shorted to ground. This protects against the accidental insertion of the DDA-3010 in anything other than its standard
rear assembly.

3010-dda.ib.rev1.doc Page 7 of 10 05/07/2006
Installation
Handling:
The DDA-3010 contains static sensitive devices and proper static free handling precautions should be observed.
When individual modules are stored, they should be placed in antistatic bags and proper antistatic procedures should
be followed when inserting and removing cards from these bags.
Power:
Ensure that the voltage selection of the IRT mounting frame used to house the DDA-3010 and the local AC mains
supply voltage match and that the correct rating fuse is installed in the mounting frame power supply.
Earthing:
Chassis earth connection of the equipment mounting frame is via the earth connection on the three pin (IEC) AC
mains supply inlet. This is a safety earth and must be connected.
Installation in frame or chassis:
See details in separate manual for selected frame type.
Links LK1 is factory set for a contact make to ground on signal failure at SK10 pin 2 on the rear panel, move LK1
from the normally closed (N/C) to the normally open (N/O) position for a break to ground on loss of signal loss or
loss of lock.
Links LK2 is factory set for a contact make to ground on signal failure at SK10 pin 3 on the rear panel, move LK2
from the normally closed (N/C) to the normally open (N/O) position for a break to ground on loss of power.
Link LK4 in the OUT position sets the card for 140 Mb/s operation and is indicated by the ‘140’ front panel LED
(yellow).
Link LK4 in the IN position sets the card for 155 Mb/s operation and is indicated by the ‘155’ front panel LED
(green).
The presence of either a 140 Mb/s or 155 Mb/s locked signal is indicated by the ‘SIGNAL’ front panel LED (green).
The presence of the internal +5 Vdc supply is indicated by the front panel LED (green).
It is recommended that unused outputs on the rear panel be terminated with 75-ohm termination plugs.

3010-dda.ib.rev1.doc Page 8 of 10 05/07/2006
Front & rear panel connector 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.
SK10 3 = Power Fail
SK10 2 = Alarm
SK10 1 = GND
3
2
1
SK10
RL1R
SK1
SK6
SK4
SK3
SK7
SK5
SK2
OUTPUTS
INPUT
ZVA-3010RL
POWER OFF
BYPASS
SK1 SK2
DC
DDA-3010
N140
140
155
SIGNAL
OUTPUT MON

3010-dda.ib.rev1.doc Page 9 of 10 05/07/2006
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. 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: [phone] Fax: [phone]
Email: [email protected]

3010-dda.ib.rev1.doc Page 10 of 10 05/07/2006
Drawing Index
Drawing # Sheet # Description
804823 1 DDA-3010 Circuit Schematic

Title
SCALE
SIZE
Sheet
DRAWN CHECKED ENG. APP. Revision:
DO NOT COPY NOR
DISCLOSE TO ANY
THIRD PARTY
WITHOUT WRITTEN
CONSENT
of1
IRT Electronics Pty. Ltd.
Drawing No.
COPYRIGHT
ARTARMON NSW AUSTRALIA 2064
A3
N.T.S. 4
DDA-3010
804823
Date: A
29-Jan-2004
155/140 Mb/s Distribution Amplifier
K.N.
Output 1 Output 2 Output 4 Output 3
SD SD
Output 5
MON
Output 6
Output Driver circuit
804823s3.sch
AC 1 AC 4 AC 2 AC 3
Power Supply circuit
804823s4.sch
31
2
LK1
'DC' 'grn'
21
R56
680R
n.c. n.o.
1A
1B
2A
2B
3A
3B
4A
4B
5A 6A
6B
7A
7B
8A
8B
10A 10B
5B
11A 11B 12A 12B 13A 13B 14A 15A 15B 17A 17B 18A 18B
9A
9B
20A 20B 14B 21A 21B 22A 22B 23A 24B 24A 25B 26A 27A 27B 28A 23B 19A 19B 30A 30B 26B 31A 31B 32A 32B 25A 16A 16B 28B 29A 29B
P1 DIN64RA
21
LD1
HLMP-1503
PCB 804824
2 1
R54 10K
+5V
+5V
'SIGNAL' 'grn'
2 1
R59
680R
21
LD4
HLMP-1503 ALARM CIRCUITS
CONTACT CLOSURE (OR BREAK)
TO GROUND ON ALARM, AS SET BY LK1,LK2
12
C36
1uF
R2R-R7R = 68R L2R-L7R = 18nH
38
RL1A
V23026
10 1
5RL1B
1 26-08-2003
+5V
Input CD SD SD RATE
Input Equaliser and Reclocking circuit
804823s2.sch
1 2
C35
100nF
1 2
F5
RXE020
POLYFUSE
+5V
1 2
C42
10nF
1 2
C43
10nF
2 1
R55
N/C 12 L3 0R0
1
2
J2 BNC
'155 Mb/s'
'grn'
21
R58
680R
21
LD3
HLMP-1503
+5V
'140 Mb/s'
'yell'
21
R57
680R
21
LD2
HLMP-1401
+5V
32
1
Q1
BSS123
32
1
Q2
BSS123
31
2
LK2
n.c. n.o.
10 1
5RL2B
12
C41
10nF
38
RL2A
V23026
+5V
+5V
J2 optional power in
(used when fitted to FRU-1030 frame)
1A 1B 2A 2B 3A 3B 4A 4B 5A 6A 6B 7A 7B 8A 8B 10A 10B 5B 11A 11B 12A 12B 13A 13B 14A 15A 15B 17A 17B 18A 18B 9A 9B 20A 20B 14B 21A 21B 22A 22B 23A 24B 24A 25B 26A 27A 27B 28A 23B 19A 19B 30A 30B 26B 31A 31B 32A 32B 25A 16A 16B 28B 29A 29B
J1 DIN64
OUTPUTS
1 2
L7R
1 2
L6R
1 2
L5R
1 2
L4R
1 2
L2R
1 2
L1R 18nH
INPUT
21 R7R 21 R6R 21 R4R 21 R5R 21 R2R
21
R1R 43R
SK1
SK2
SK4 SK5 SK6 SK7
1 2 3J2
2 1
JP1 N/C
2 1
JP2 N/C
1 2 3 4 5 6 7 8 9 1013
14 15 16 17 18 19 20 21 22
RL1R G5Y-254P
13
2
D1R BAS16
1 2 3 4 5 6
P3
Not Fitted
1 3 5 7 9
P2
Not Fitted
3 2 1
SK10
Signal Fail Fail Alarm contact closure to ground.
PROTECTED OUTPUT
Power Fail Fail Alarm contact closure to ground.
1 2
L3R
21 R3R SK3
1 3
2
D4
BAS16
1 3
2
D3
BAS16