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DMM

4880 & DMX

4880 Instruction Book 

Revision 0

 

www.irtelectronics.com 

Page 16 of 16 

4880

DMM_4880

DMX_ib_Rev0.doc 

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: 

61 2 9439 3744 

Fax:  61 2 9439 7439 

Email: service@irtelectronics.com 

 

IRT 

Communications 

www.irtcommunications.com

Summary of Contents for DMM-4880

Page 1: ...p 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 02 9439 3744 Fax 02 9439 7439 International 61 2 9439 3744 61 2 94...

Page 2: ...IRT Eurocard Type DMM 4880 DMX 4880 4 STM 1 to STM 4 Multiplexer De Multiplexer Revision History Revision Date By Change Description Applicable to 0 13 08 2010 AL Original Issue Firmware versions DMM4...

Page 3: ...Description 5 Technical Specifications 6 Configuration 7 Installation 8 Signal Connections 8 DMM 4880 8 DMX 4880 10 Front Panel LEDs 11 DMM 4880 11 DMX 4880 11 Front and rear layouts 12 Operation 13...

Page 4: ...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 Optical Safety The l...

Page 5: ...k into the original four 155Mb s STM 1 signals Front panel indications on the DMX 4880 de multiplexer shows if valid encoded STM 1 signals are present SNMP Simple Network Management Protocol is availa...

Page 6: ...or loss of power MINOR Open circuit on no valid output STM 1 streams present or loss of power Optical Optical path loss2 3 to 18 dB with PIN detector typically 20dB Optical fibre Designed for use wit...

Page 7: ...0 card and the CDM card SNMP Agent of the frame major and minor SNMP alarms that are reported to the CDM card of the frame can be disabled DMX 4880 SW1 1 Not used SW1 2 Not used SW1 3 Not used SW1 4 N...

Page 8: ...terminated in 75 Input cable equalisation is automatic for up to 200m of high quality 75 coaxial cable Belden 8281 or equivalent No adjustments are required STM 4 Reference Input The STM 4 reference...

Page 9: ...SK 7 IN4 PL4 SK10 SK 2 IN3 PL3 SK 11 IN2 SK 6 IN1 1 2 3 1 GND 2 MINOR 3 MAJOR STM 1 I P4 STM 1 I P1 STM 1 I P3 ALARM O P STM 1 I P2 DMM 4880 Rear Assembly Connections With STM 4 Ref I P option STM 4...

Page 10: ...nt to the corresponding STM 1 electrical input on the matching DMM 4880 Alarm Outputs Two relay alarm output states are provided via a phoenix style 3 pin plug Pin 3 is designated as Major pin 2 is de...

Page 11: ...put signal to synchronize with Only valid for DMM 4880 fitted with optional STM 4 reference input port The ALARM LED does not illuminate as there is no Major Alarm associated with the DMM 4880 DMX 488...

Page 12: ...ale and are intended to show connection order and approximate layout only I P 1 I P 2 I P 4 I P 3 ALARM REF I P DC DMM 488 0 N140 O P 1 O P 2 O P 4 O P 3 ALARM DC DMX 488 0 N140 SK 9 OUT3 PL4 SK10 SK...

Page 13: ...information into a form compatible with SNMP The agent therefore acts as an interface between the NMS and the managed devices The NMS sends a request message and control commands for the managed devic...

Page 14: ...tible need a plug in SMU 4000 module with a program relevant to the module that it is plugged into Depending on the module besides the module identification parameters such as alarm states inputs and...

Page 15: ...the Urgent and Non Urgent alarms noAlarms 1 UrgentAlarms 2 no or invalid STM 4 input signal present nonUrgentAlarms 3 no valid STM 1 signals encoded on any channel All STM 1 signals are AIS An indica...

Page 16: ...ed 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 pos...

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