IRT DDA-3280 User Manual Download

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3280-dda.ib.doc

page 1 of 16

23/07/2002

IRT Eurocard

Types DDA-3280

2 Mb/s G.703 Data Distribution Amplifier

ZDA-3280RH

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

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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