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3280-dda.ib.doc 

page 15 of 16

 

23/07/2002 

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] 

IRT 

Communications 

www.irtcommunications.com

Summary of Contents for DDA-3280

Page 1: ...0 832 575 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...

Page 2: ...cs CCIT G 703 2048 kb s 5 ZDA 3280RH 6 Characteristics of signal 7 Coding Characteristics 7 G 703 Data Signal Format 7 Description of Operation 8 Handshake Operation 10 Pre installation 12 Operational...

Page 3: ...e ZDA 3280RH dual rear assembly must be used When used as a line equaliser or distribution amplifier the DDA may be housed in any of IRT s standard Eurocard frames When used in pairs for handshake ope...

Page 4: ...AY K 1 3 RELAY K 1 2 DDA SIGNAL PROCESSING RELAYS K 3 2RL1 2RL2 INPUT J 1 RELAY K 1 3 RELAY K 1 2 OUTPUTS J 4 RECLOCKING AIS DETECTION DATA FAIL DETECTION MAIN SBY LOGIC FOR K 3 Relay K 1 Power fail b...

Page 5: ...loss AIS detect Module in service Module in standby Other Power requirements 28 Vac CT 14 0 14 or 16 Vdc Power consumption 170 mA 5 5 VA Temperature range 0 50 C ambient Mechanical Suitable for mounti...

Page 6: ...module is able to provide an output free of the same defects and changeover inhibit switch is not activated on either module Priority logic The priority switching in normal mode follows non reverting...

Page 7: ...rve the AC nature of the signal a coding system is used to ensure that a succession of either 1 s or 0 s in the original data does not produce a DC output The coding system varies according to the typ...

Page 8: ...by any external signal present via pin 15a of the rear connector to the reset coil When power is applied to the DDA the logic circuit will cause the K 3 relay to be set If two DDA s are connected in h...

Page 9: ...nts the AIS detection from operating the automatic changeover function when used in handshake configuration and prevents AIS from setting the general alarm output The AIS detection circuit will howeve...

Page 10: ...rear assembly ZDA 3280RH This rear assembly makes all the necessary connections for both logic and data signals when two DDA s are inserted side by side in a 3 RU frame Individual alarm outputs are pr...

Page 11: ...dition and so both will attempt to become Main As the P O R signal for each module will be slightly different for any two modules one will reach its operating mode first and will force the other modul...

Page 12: ...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 chass...

Page 13: ...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 causing data errors In general cable run...

Page 14: ...f connectors indicators and controls only MON ALLOW INHIBIT REQUEST AIS STANDBY CHANGE DATA LOSS IN SERVICE DDA 3280 N140 ZDA 3280RH 1 2 3 4 2SK 2 1J 2 MODULE 1 1J 3 MODULE 2 1J 4 1 2 3 4 2J 1 1J 1 IN...

Page 15: ...ir 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...

Page 16: ...DA schematic part 1 804066 2 DDA 3280 2 Mb DA schematic part 2 804066 3 DDA 3280 2 Mb DA signal path block diagram 804066 4 DDA 3280 2 Mb DA external logic block diagram 804184 1 ZDA 3280RH Handshake...

Page 17: ...2 1 GEN ALARM 2 1 R62 4K7 2 1 F1 4R7 2 1 F2 4R7 2 1 F3 4R7 2 1 F4 4R7 5 6 U5C HC14S PB1 make_main_req SW1 inhib_co LD1 dataloss_led LD2 ais_led LD3 in_service_led LD4 standby_led 2 1 R61 4K7 2 1 R65 1...

Page 18: ...1 2 C82 1 2 C81 1 2 C80 2 1 3 DD3 BAV70 2 1 3 DD5 BAV70 2 1 3 DD7 BAV70 2 1 R1 300R 3 1 2 RV1 100k 1 2 C3 100n 1 2 C4 33p 1 2 C6 100n 1 2 C7 10u 1 2 C8 100n 1 2 C11 10u 1 2 C12 100n T2 T4 6T L1 48u CT...

Page 19: ...W AUSTRALIA 2064 A3 N T S 5 DDA 3280 804066 Date 6 Feb 2002 CLOCK AND DATA RECOVERY CLOCK MARK MARK AIS DETECTION DATA FAIL DETECTION MAIN SBY LOGIC FOR K3 AMPLIFIER 2MB DATA DISTRIBUTION BLOCK DIAGRA...

Page 20: ...V 5V 5V 5V 5V 12V K2 Gen alarm Make main Inhibit Data loss LED AIS LED In service LED Standby LED 12V K1 5V __ __ __ __ 5V 5V SK2 KRONE Gen alarm Ext C O Req Gnd BLOCK DIAGRAM DDA 3280 EXTERNAL LOGIC...

Page 21: ...1 32B 2SK1 1A 2SK1 2A 2SK1 3A 2SK1 4A 2SK1 5A 2SK1 6A 2SK1 7A 2SK1 8A 2SK1 9A 2SK1 10A 2SK1 11A 2SK1 12A 2SK1 13A 2SK1 14A 2SK1 15A 2SK1 16A 2SK1 17A 2SK1 18A 2SK1 19A 2SK1 20A 2SK1 21A 2SK1 22A 2SK1...

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