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IRT DDA-3301, Manual

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IRT DDA-3301 Manual Download Page 1

3301-dda.ib.doc

 

page 1 of 20

 

06/01/2004 

 

 

 

IRT Eurocard 

 

Types DDA-3301 

G.703 Data Distribution Amplifiers 

& 

ZDA-3301RH 

Handshake changeover assembly 

 
 

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 
 

Designed and manufactured in Australia 

 

IRT can be found on the Internet at:

 

http://www.irtelectronics.com 

Summary of Contents for DDA-3301

Page 1: ...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 irtel...

Page 2: ...ications 6 Electrical characteristics of G 703 signals 9 Characteristics of signal types 10 Coding characteristics 10 G 703 data signal format 10 Description of operation 12 Handshake operation 14 Pre...

Page 3: ...e front panel The primary output 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 A...

Page 4: ...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...

Page 5: ...2 INPUT RELAY K 1 3 RELAY K 1 2 DDA SIGNAL PROCESSING RELAYS K 3 RL 1 RL 2 INPUT J 1 RELAY K 1 3 RELAY K 1 2 OUTPUTS RELAY RL 1 J 3 RECLOCKING AIS DETECTION DATA FAIL DETECTION MAIN SBY LOGIC FOR K 3...

Page 6: ...oupled Number 3 switched regenerated reclocked outputs located on rear connection assembly and one located on front panel Impedance 75 source terminated DDA 3301 45 Generally in accord with CCITT G 70...

Page 7: ...Loss is defined as less than 120 data 1 s in 512 G 703 data rate clock periods Connectors Data BNC Alarm Krone LSA plus Indicators DC power Data loss AIS detect Module in service Module in standby Po...

Page 8: ...is not disabled by link LK 1 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...

Page 9: ...KHz 18 dB 8448 KHz to 12672 KHz 14 dB Electrical characteristics CCITT G 703 34368 Kb s Cable Type Coaxial Impedance 75 Signal level 1 0 V Nominal pulse width 14 55 ns Code conversion HDB3 Pulse shap...

Page 10: ...ous points in the DDA when in operation They are not intended as accurate portrayals of either voltage levels or timing It can be seen that the original signal has both positive and negative going pul...

Page 11: ...3301 dda ib doc page 11 of 20 06 01 2004 Original signal Cable effected signal Equalised signal Positive mark signal Negative mark signal Output signal...

Page 12: ...d module provided that no alarms are present An external changeover request may also be made via pin 3 of SK 2 alarm control connector on the rear panel provided that the changeover inhibit switch on...

Page 13: ...y a link on the main board LK 1 This prevents the AIS detection from operating the automatic changeover function when used in handshake configuration and prevents AIS from setting the general alarm ou...

Page 14: ...ule 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...

Page 15: ...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 installatio...

Page 16: ...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 connectio...

Page 17: ...put 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 ca...

Page 18: ...UT MODULE 1 1SK 2 1 2 3 SK 3 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 co...

Page 19: ...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 fau...

Page 20: ...4 Drawing index Drawing Sheet Description 804361 1 DDA 3301 34 34 Mb DA schematic part 1 804361 2 DDA 3301 34 34 Mb DA schematic part 2 804362 DDA 3301 45 45 Mb distn amplifier parts list 804807 ZDA 3...

Page 21: ...NGE GROUND RECLOCK SHT 2 SHT 2 DDA 3301 34 K1 1 K2 1 1 2 U5A HC14S 3 4 U5B HC14S Q8 NPN 2 1 D2 1N4148 J1 K1 2 K1 3 R56 560 R57 560 R58 560 R59 560 R60 4K7 K2 1 GEN ALARM R62 4K7 F1 4R7 F2 4R7 F3 4R7 F...

Page 22: ...2 100n R36 820 C35 100n R1 150 R2 150 C2 100n R5 100 R6 10 R3 1K R4 1K R7 27 R10 27 R8 56 R9 13 C6 2n2 C7 100n C4 100n R11 3K0 C8 100n 2 1 D1 3081 R15 75 R12 2K0 R16 30 R21 75 Q3 2N2369 R17 300 L3 33u...

Page 23: ...Connection SAH J2 J3 J4 2J1 1J1 2KS1 14A 14B 15A 16B 17A Main Select 12V Status Gnd Loop Present 12V Gen Alarm Power Fail Gnd Change 15B 16A 1SK1 INPUT Module 2 27A 1 2 3 4 2SK2 1 2 3 4 1SK2 18A 18B 1...

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