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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
Types DDA-3301
G.703 Data Distribution Amplifiers
&
ZDA-3301RH
Handshake changeover assembly
Designed and manufactured in Australia
IRT can be found on the Internet at:
http://www.irtelectronics.com
3301-dda.ib.doc
page 1 of 20
06/01/2004
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Summary of Contents for IRT DDA-3301
- Page 1 +61 2 9439 7439 Email: sales@irtelectronics.com Web: www.irtelectronics.com IRT Eurocard Types DDA-3301 G.703 Data Distribution Amplifiers & ZDA-3301RH Handshake changeover assembly Designed and manufactured in Australia IRT can be found on the Internet at: http://www.irtelectronics.com 3301-dda.ib.doc page 1 of 20 06/01/2004...
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Page 2: Table Of Contents
IRT Eurocard Type DDA-3301 G.703 Data Distribution Amplifiers & ZDA-3301RH Handshake changeover assembly Instruction Book Table of Contents Section Page General description Functional diagrams Technical specifications Electrical characteristics of G.703 signals Characteristics of signal types Coding characteristics G.703 data signal format... -
Page 3: General Description
DDA’s whilst others are intended primarily for use in redundant path switching applications. The DDA-3301 is currently available in 8, 34 and 45 Mb/s G.703 rates and is primarily intended for use in pairs with a double width rear assembly (ZDA-3301RH) for automatic path protection applications. - Page 4 Equipment provided: Standard: DDA-3301/XX Data distribution amplifier module. (Where XX is the G.703 data rate) ZDA-3301 Rear assembly for stand alone DDA-3301. Accessories available: ZDA-3301RH Double rear assembly for handshake: Connects two adjacent DDA-3301’s for automatic changeover of all three outputs in the event of a fault being detected.
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Page 5: Functional Diagrams
Functional diagrams INPUT Block diagram DDA-3301- Signal path RELAY K 1.3 OUTPUTS RELAY RELAY EQUALISER K 1.2 RECLOCKING CLOCK CLOCK & RELAY DATA + MARKS RL 1 RECOVERY - MARKS Relay K 1 = Power fail bypass. Relay K 3 = Magnetic latching Main/Sby. -
Page 6: Technical Specifications
Technical specifications DDA-3301/8: Conforms to CCITT G.703 8448 Kb/s – see Electrical characteristics of G.703 signals. Input: Type Transformer coupled. 75 Ω terminated. Impedance Cable equalisation Automatic. 0 - 6 dB at 4,224 KHz. Components set for Beldin YR23769 cable. - Page 7 170 mA. (5.5 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...
- Page 8 ZDA-3301RH Technical specifications 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.
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Page 9: Electrical Characteristics Of G.703 Signals
Electrical characteristics of G.703 signals Electrical characteristics CCITT G.703 2048 Kb/s: Pair each direction One coaxial pair. 75 Ω resistive. Test load impedance Signal level 2.37 V. Nominal pulse width 244 ns. Code conversion HDB3. Pulse shape Fig. 15/G.703. Jitter at input port §... -
Page 10: Characteristics Of Signal Types
Characteristics of signal types Coding characteristics - G.703: The HDB3 (High Density Bi-polar of order 3) code as defined in G.703 for 34,368 Kb/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. - Page 11 Original signal Cable effected signal Equalised signal Positive mark signal Negative mark signal Output signal 3301-dda.ib.doc page 11 of 20 06/01/2004...
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Page 12: Description Of Operation
Description of operation See block diagrams commencing on page 5 and schematic diagrams at rear of this manual. Unless specified, the following description applies to all G.703 data rates. Input: The G.703 input signal is connected to the input circuit of the amplifier. If no power is present, and the amplifier was active before the power was removed, then the signal will be directed to the output connector via K 1 and K 3. - Page 13 AIS flag and the general alarm relay output will be activated connecting the general alarm output contact to ground. Note however that when data errors or no data is detected that the DDA-3301 does not generate an outgoing AIS data stream to the data outputs.
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Page 14: Handshake Operation
3 RU frame. Individual alarm outputs are provided for each module. Detailed operational description: Connections for handshake (paired) operation of two DDA-3301’s are shown in the following diagram. ZDA-3301RH handshake connections (Three switched outputs) Outputs... - Page 15 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.
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Page 16: Pre-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... -
Page 17: Internal Adjustments
This module uses a programmable logic device as the main processing circuit. This device must be correctly programmed is only obtainable through IRT. No attempt should be made to substitute other devices or to programme a similar device as this could cause extensive damage to the module. -
Page 18: Front & Rear Panel Diagrams
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. 3301 ZDA-3301 DD A- 3 3 0 1 MODULE 2 MODULE 1 O/P 1 O/P 2... -
Page 19: Warranty & Service
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. -
Page 20: Drawing Index
Drawing index Drawing # Sheet # Description 804361 DDA-3301/34 34 Mb DA schematic part 1. 804361 DDA-3301/34 34 Mb DA schematic part 2. 804362 DDA-3301/45 45 Mb distn amplifier parts list 804807 ZDA-3301RH handshake rear assembly schematic 3301-dda.ib.doc page 20 of 20... - Page 21 1 06/06/00...
- Page 22 1 06/06/00...
- Page 23 1 30-07-2003...
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