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Installation
and Testing
This manual describes the procedures for installing and testing the CBR-7 Fiber-Optic Repeaters.
o For 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 Industrial Fiber Optics.
o 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.
o For technical specifications, see the CBR-7 product specification, document PS-029.
CBR-7 Installation and Testing
5 Mbit/s
Repeater
Carrier-band
to Single-mode
Fiber Optic
1
Models
CBR-7AC
CBR-7DC
501-281, Rev C.0
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Summary of Contents for Relcom CBR-7AC
- Page 1 For 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 Industrial Fiber Optics. o 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.
- Page 2 The Repeater is powered from an AC or DC power source depending on the option chosen. CBR-7AC power input 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 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-hazardous. AC Power plugs CBR-7 Installation and Testing 501-281, Rev C.0...
- Page 4 If these tests do not produce the specified results, the Repeater(s) may be defective and should be returned for repair. THERE ARE NO USER ADJUSTMENTS OR REPAIRS TO BE MADE INSIDE THE REPEATER. For guidance about installing the carrier-band segment of the network, see Relcom's Carrier- band Network Handbook. CBR-7 Installation and Testing 501-281, Rev C.0...
- Page 5 THERE ARE NO USER ADJUSTMENTS OR REPAIRS THAT CAN BE PERFORMED ON THE REPEATER. IF THE REPEATER DOES NOT WORK PROPERLY, RETURN IT TO RELCOM FOR REPAIR OR REPLACEMENT. CBR-7 Installation and Testing 501-281, Rev C.0...
- Page 6 Fiber-Optic Testing When the CBR-7 repeaters and the optical components are installed, they must be tested to verify that they work properly. The fiber optic components between two CBR-7 repeaters must be able to carry light signals from the transmitter of one repeater to the receiver of the other. The components include the main cable between the two repeaters, and may also include a patch panel at each end, the patch cables, and an attenuator.
- Page 7 Attenuation Measurement Determine the light output level of the CBR-7 transmitter. Disconnect all patch cables from the transmitter. Connect a coaxial cable between the Test and the A connectors of the CBR-7. Connect a light meter to the transmit connector. Power the CBR-7 and measure the transmitter light level.
- Page 8 From the example above, if the light measured at the receiver is -11.2dBm then the Measured 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 deviation would indicate a problem with the attenuation estimate and might indicate that optical components are out of specification.
- Page 9 Return Loss CBR-7 performance depends on low return losses (reflections) of the optical components. This must be measured to be sure all the optical components are within their specifications. 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 attenuator with an Optical Time Domain Reflectometer, OTDR, as shown below.
- Page 10 Receiver side With all the optical components connected, disconnect the CBR-7 at the receiver. (Be sure that the CBR-7 on the transmit side is not powered). Measure the return loss of the optical components as shown below. Neglect any near-end readings. The return loss of interest is that at the end of the cable as seen from the receiver end.
- Page 11 Here is an example: The top of the screen is at -10 dB. There are two reflections. One is at 4 km and the other at 8 km, at the 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.
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