Shyam Telecom BTSLINK-208 User Manual

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Figure 13: Password Setting

6.3. Block Description

Main constituents of the system are:

I) Master Optical Unit (MOU)

The MOU is installed at the indoor location close to the BTSs. In the DL

path, the received RF signals from the BTSs are fed to the MOU, which converts the RF signals to a stream of optical signals to be applied to the optical fibers for transmission to the DBROUs installed at different locations. The optical signals between MOU & each of the DBROUs are propagated on two single mode fibers.

In the UL path, the optical signals received from each of the DBROUs are converted back to the RF signals in the preset frequency bands for application to the BTSs.

The connectivity between the MOU and the BTS is through low loss RF

coaxial cable via directional coupler. The type of directional coupler shall depend on the loss between the BTS & the MOU.

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Modules in the MOU

a) Duplexer: It is provided in the RF path interfacing BTSs for providing

isolation between the DL & UL frequency bands. One duplexer is equipped for each band.

b) Optical Transmitter Unit (OTX):

It receives RF signals in the preset frequency bands in the DL path & converts the same to the optical signals in 1310 nm wavelength at a level of –1.5±1dBm for application to the optical fiber. Two OTX units are equipped in MOU for handling signals for 8 DBROUs.

c) Optical Splitter 1:4 Unit: As indicated earlier, one MOU supports 8

DBROUs at different locations, the optical signals from OTX are split in this unit in to 4 in case of BTS Link-204. Two splitters shall be equipped in case of 8 DBROUs.

d) Optical Receiver Unit (ORX): Up to 8 ORX units (depending on the

number of DBROUs) are equipped in the MOU and each of them receives optical signals in 1550 nm wavelength from the DBROU in the UL path. Out put from ORX units are converted in to RF signals for application to BTS at the desired power.

e) Power Supply Unit (PSU): The unit gets input of –48 V DC or 100 to

240 V AC (depending on option) for deriving different DC voltages required for other active units in the MOU.

f) Gain Module: It is available after ORX in the UL path for making RF

signals available for application to the BTS.

g) Supervisory & ASK Modem: Supervisory and ASK modem enable

the monitoring the status of MOU & DBROUs at different locations and the information can be extracted through USB interface available in the front panel.

h) VFD & Key Pad: It is possible to set the required parameters for

configuration through the VFD & Key pad in the absence of PC/laptop. USB interface is available for connecting the Laptop/PC for downloading the CMC software and monitoring of the whole link. A wireless modem (optional) is equipped in the system for remote monitoring & configuration through Dial up connection.

II) Optical Fiber & Patch Cords: It is very important part of the system,

which connects MOU with DBROU through two fibers. Two single mode optical fibers are needed between the MOU and each of the DBROUs. Each pair of fibers for the specific DBROU is terminated at the corresponding ORX/TRX unit(s) in the MOU.

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III) Dual Band Remote Optical Unit (DBROU): As indicated earlier,

maximum up to 8 DBROUs are located at different sites as per requirement. The DBROU shall be installed at indoor location for providing coverage in the targeted area. It houses the following modules:

a) Optical Receiver Unit (ORX): One such unit is provided in the

DBROU, which receives the optical signals in the 1310 nm wavelength in the DL path from MOU and converts the same to RF signals in the preset frequency bands.

b) Power Amplifier (PA): The PA unit is responsible for generating the

desired RF power 0f +33dBm for application to the server antennas. For detailed specifications regarding gain, refer to clause 7.1. Two PA units are equipped in each DBROU, one for each band.

c) Duplexer: It is provided to isolate the DL & UL RF signals. It

interfaces with the server antenna through Diplexer.

d) Low Noise Amplifier (LNA): It is provided in the UL path after the

duplexer to provide the amplification to the RF signals.

e) Optical Transmitter Unit (OTX):

It receives RF signals in the preset frequency bands in the UL path & converts the same to the optical signals in 1550 nm wavelength at a level of +4±1dBm for application to the optical fiber. One OTX unit is equipped in SBROU.

f) Power Supply Unit (PSU):

One PSU is equipped in the DBROU for deriving DC voltages required for operation of different devices, it gets AC in the range of 100-240 V, 47/63 Hz.

g) Supervisory & ASK Modem: Supervisory and ASK modem enable

the monitoring the status of MOU & SBROUs at different locations and the information can be extracted through USB interface.

h) Gain Modules:

One is provided between ORX and PA in the DL path for enabling generation of the desired RF band. Another one is provided with the OTX unit.

i) Attenuator: A variable attenuator up to 31 dB in step of 1 dB is

provided for adjusting the RF power radiated from the Power Amplifier in the UL path.

j) Server Antenna: It does not form main part of the equipment. The RF

signals from SBROU are distributed to the mobile users through a set

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of server antennas mounted at the appropriate indoor locations. The antennas should be of appropriate gain & required frequency band.

7. BTS LinK-208 Repeater Specifications

7.1. Electr i c al S pecificatio n s - R F & O p tical

S.NO. Parameter Specifications MOU Specifications DBROU

1. Optical

1310 nm 1550 nm

Wavelength (TX)

2. Optical

1550 nm 1310 nm

Wavelength (RX)

3. Frequency Band

Same as indic ated in clause 5.1

4. Optical Power TX

5. RF power in DL

-1.5±1dBm +4±1dBm

- +33dBm

Same as indic ated in clause 5.1

path

6. Impedance at RF

50 Ohms 50 Ohms

ports

6. Spurious Emission

7. System Noise

< -36dBm @ 9 KHz to 1

GHz, <-30dBm @ 1 GHz

----------------5dB max. --- ------------------------------

to 12.75 GHz

< -36dBm @ 9 KHz to 1

GHz, <-30dBm @ 1 GHz

to 12.75 GHz

figure

8. Group delay

---< 5 microseconds---- -------------------------------

without fiber

7.2. Electri cal Specificatio n Power Requirement

S.NO. Parameter Specifications MOU Specifications DBROU

1. Power Supply -48 V DC/AC mains 100-240 V AC, 47/63 Hz

2 Power

consumption

60 watts (Fully equipped) 150 watts

7.3. External Electrical/Optical Interface

S.NO. Parameter Specifications for MOU Specifications for ROU

1. RF Port

N-type N-type

2. Optical Port

FC-PC FC-PC

7.4. Mechanical Specification

S.NO. Parameter Specifications

Specifications DBROU

MOU

1.

2.

Dimensions (w x h x d)

485x400x135 mm

(19x16x5 inches)

12 Kg. (26 lbs.) 25 Kg. (55 lbs.) +33dBm,

700x385x210 mm (27x15x8 inches)

Weight

3.

Housing

Metal Housing for Indoor application

Metal Housing fo r I n door ap p li c ation

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4. Housing

Grey Grey

Color

5.

Cooling

Convection Convection

7.5. Environmental Specification

Conditions Specification

o

C to +55 0C (+230F to +1310F)

Operating Temperature

-5

0

C to +750C (-220F to +1670F)

Storage Temperature Enclosure

-30 In accordance with Indoor application

7.6. Conten ts of Delivery

ITEMS QUANTITY Repeater BTS Link-208 MOU Repeater BTS Link-208 DBROU PC interface cable for USB port Power cable 3 pin – 3 meter length Operation & Installation manual CD containing the application software Wireless Modem (Optional) Mounting Clamps with Nuts-bolts

As per requirement As per requirement As per requirement As per requirement As per requirement As per requirement As per requirement

1

7.7. Safety Precautions-Handling Optical Equipment Special care has to be taken while handling the optical equipment to avoid

damage not only to the equipment but also to the technicians/Engineers. MOU and DBROUs are equipped with Lasers; direct exposure to the human eyes must be avoided. Though the Lasers used in the equipment are of low power and are classified as class III B (norm EN60825) even then enough care needs to be taken to avoid exposure.

Optical connectors for single mode fibers are designed for sub micron tolerances. Such a connector has an optical section of only 9-micrometer diameter.

Even a small particle of dust shall cause excessive loss & adversely affect the performance:

For safety reasons & optimum performance, following points need attention:

• The optical connectors should never be left in open condition to avoid entry of dust/moisture etc.

• When working with the optical connectors or the optical fiber, check at each end that both optical transmitters are switched off.

• The connectors should be cleaned regularly with ethyl alcohol and tissue paper; the tip should not be touched with bare hands.

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• The connectors are very delicate in nature therefore proper aligning without applying excessive force should carry out removal & insertion.

8. Installation

8.1. Preparation Sheet-Pre Installation

1. General

Application: Indoor Frequency Bands:

Cellular Frequency Band DL: 869 MHz to 894 MHz

Frequency Band UL: 824 MHz to 849 MHz

PCS

Frequency Band DL: 1930 MHz to1990 MHz Frequency Band UL: 1850 MHz to 1910 MHz Number of DBROUs installed at different sites:

2. Master Unit Parameter Remarks

BTS power Estimated Feeder Loss between BTS & Coupler Estimated Coupling loss (in coupler) Estimated Feed er lo s s between coupler & Master unit Estimated Input RF power in DL to Master unit Arrangement for termination of optical fibers Optical power in link path (DL) Estimated RF power in UL

3. Optical Path

Parameter Remarks

Optical Fiber length between MOU-DBROU 1……8 Estimated optical loss between MOU-DBROU 1……8 Estimated optical signal level at each DBROU input in DL Estimated optical signal level at MOU from each of the DBROUs

4. Remote Unit (s)

Parameter Remarks

Estimated attenuation in DL Estimated attenuation in UL Arrangement for termination of optical fibers Desired power at server antenna in DL Proposed gain setting in DL