Relcom CBR-7AC Installation And Testing Instructions Download Page 1

CBR-7 Installation and Testing  

 

 501-281, Rev C.0 

 

 

Installation 

and Testing 

5 Mbit/s 
Repeater  
Carrier-band  
to Single-mode 
Fiber Optic  

Models  

CBR-7AC 

CBR-7DC 

 

 
 

           

 

 

This manual describes the procedures for installing and testing the CBR-7 Fiber-Optic Repeaters. 

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For an explanation of how to install the coaxial cable part of the carrierband network, see 
Relcom’s Carrier-band Network Handbook. 

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For an explanation of how fiber optics works, see Relcom’s Guide to Industrial Fiber Optics.   

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For an explanation about how repeaters work, and CBR-7 system design information, see 
Relcom’s CBR-7 System Design Application Note, document 501-276. 

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For technical specifications, see the CBR-7 product specification, document PS-029. 

 

Summary of Contents for CBR-7AC

Page 1: ...or an explanation of how to install the coaxial cable part of the carrierband network see Relcom s Carrier band Network Handbook o For an explanation of how fiber optics works see Relcom s Guide to In...

Page 2: ...range is from 85 to 240 volts 47 to 63 Hertz The power cord connection to the Repeater is a standard IEC 320 plug Different types of power cords can be used to adapt to various types of power sources...

Page 3: ...esting 501 281 Rev C 0 3 Hazardous Area Warning For both AC and DC Repeaters users are warned not to disconnect power to the Repeater while the circuit is alive unless the location is known to be non...

Page 4: ...ble to an oscilloscope The second Repeater will put out signal bursts on its connector A The peak to peak voltage of the bursts should be between 3 0 and 3 9 Volts Keep in mind that the cable gives a...

Page 5: ...10 8 or one bad bit received for one hundred million sent If the ERROR light blinks ON more frequently There may be excessive noise on the network coaxial cable segment Use the Carrier band Tester to...

Page 6: ...onnection components Patch Panel Patch Panel The total attenuation insertion loss of optical components must be at least 15 dB but not more than 24 dB If necessary an attenuator must be used on the tr...

Page 7: ...CBR 7 and measure the transmitter light level CBR 7 A B XMIT Rec TEST 5 dBm Light Meter Disconnect the light meter from the transmitter Connect the patch cable to the transmitter and all the other op...

Page 8: ...sured Attenuation of the optical components is 5dBm the measured transmitter output 11 2dBm 6 2 dB This is 1 dB more than the calculated attenuation value A variation of 1 dB is not critical A larger...

Page 9: ...fications Transmit side With all the optical components connected together disconnect the patch cable at the CBR 7 transmitter and measure the return loss of the optical components without the attenua...

Page 10: ...is not the case there is something wrong with the attenuator or the patch cable assemblies that produces extraordinary reflections In the example above the attenuator s value is 10 dB Assume the measu...

Page 11: ...e end of the cable The one at 4 km is 15 dB below the one at the end and it can be neglected since it is more than 10 dB below the reflection of interest at the end of the cable The reflection at the...

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