Mobile WiMAX RF Manual
33dBm
2008. 12
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CONTENTS
1 SYSTEM OUTLINE .................................................................................... 7
2 SYSTEM CONFIGURATION ........................................................................ 8
2.1 MOBILE WIMAX ......................................................................................................... 8
2.1.1 Base Station Direction (Donor ANT) ................................................................................................... 9
2.1.2 Service Direction (Service ANT) ........................................................................................................... 9
2.1.3 UL CPL (Up Link Coupling) ................................................................................................................... 9
2.1.4 DL CPL (Down Link Coupling) ............................................................................................................ 10
2.1.5 GUI ............................................................................................................................................................ 10
2.1.6 AC Power ................................................................................................................................................. 10
2.1.7 DC Battery ............................................................................................................................................... 10
3 SYSTEM FIGURES AND SPECIFICATIONS .................................................. 11
3.1 MOBILE WIMAX SYSTEM SPECIFICATIONS ................................................................. 11
3.1.1 System Figures ...................................................................................................................................... 11
3.1.2 Features and Functions ....................................................................................................................... 11
3.1.3 Environment Figures ............................................................................................................................. 12
3.2 SYSTEM SPECIFICATION .......................................................................................... 13
3.2.1 System Specification ............................................................................................................................ 13
3.3 MAIN COMPONENT SPECIFICATION .......................................................................... 16
3.3.1 Switch Module Specification............................................................................................................... 16
3.3.2 UDC (Up/Down Converter) Specification ........................................................................................ 17
3.3.3 BPF Module Specification ................................................................................................................... 19
3.3.4 HPA Specification ................................................................................................................................. 21
3.3.5 SDM (Sync Detector Module) Specification .................................................................................... 22
3.3.6 CONTORLLER SPECIFICATION .......................................................................................................... 23
3.3.7 PSU Specification .................................................................................................................................. 24
4 SYSTEM STRUCTURE AND FUNCTION ...................................................... 27
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4.1 REPEATER STRUCTURE AND EXPLANATION ............................................................... 27
4.1.1 Repeater External Appearance ........................................................................................................... 27
4.1.2 REPEATER INTERIOR ........................................................................................................................... 28
4.2 EXPLANATION OF INTERNAL CONFIGURATION ........................................................... 29
4.2.1 Switch Module ........................................................................................................................................ 29
4.2.2 UDC Module ............................................................................................................................................ 31
4.2.3 BPF Module ............................................................................................................................................. 32
4.2.4 HPA MODULE ......................................................................................................................................... 33
4.2.5 SDM .......................................................................................................................................................... 34
4.2.6 Controller Module .................................................................................................................................. 36
4.2.7 PSU ........................................................................................................................................................... 38
5 SIGNAL BLOCK DIAGRAM AND SIGNAL FLOW ........................................... 39
5.1 SYSTEM BLOCK DIAGRAM........................................................................................ 39
5.1.1 Forward Direction Block Explanation ................................................................................................ 39
5.1.2 Reverse Direction Block Explanation ................................................................................................ 40
5.2 UNIT MODULE BLOCK DIAGRAM ............................................................................... 40
5.2.1 SWITCH MODULE BLOCK DIAGRAM ................................................................................................ 40
5.2.2 UDC BLOCK DIAGRAM ........................................................................................................................ 42
5.2.3 SDM & CTRL BLOCK DIAGRAM ......................................................................................................... 43
5.2.4 PSU BLOCK DIAGRAM ......................................................................................................................... 44
6 ADDITIONAL FUNCTION ......................................................................... 45
6.1 ASD (AUTO SHUTDOWN) FUNCTION ......................................................................... 45
6.1.1 Aim of ASD Functions .......................................................................................................................... 45
6.1.2 ASD Management Procedure ............................................................................................................. 45
6.2 ALC FUNCTION ....................................................................................................... 47
6.2.1 AIM of ALC FUNCTION ......................................................................................................................... 47
6.2.2 Management Procedure ....................................................................................................................... 47
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1 PC APPLICATION PROGRAM ................................................................... 49
1.1 PROGRAM INSTALLATION ........................................................................................ 49
1.2 PROGRAM START .................................................................................................... 52
1.3 STATUS MONITORING AND CONTROL ....................................................................... 53
1.4 TABLE ............................................................... ..................................................... 65
1.5 DOWNLOAD ............................................................................................................ 70
2 WEB GUI .............................................................................................. 75
2.1 PROGRAM START .................................................................................................... 75
2.2 BASIC DISPLAY CONFIGURATION ............................................................................. 77
2.3 SECURITY (PASSWORD SETUP) ................................................................................ 80
2.4 CLOCK................................................................................................................... 81
2.5 NETWORK .............................................................................................................. 82
2.6 CONTROL .............................................................................................................. 85
2.7 HIDDEN ................................................................................................................. 92
2.8 SYNC ............................................................... ...................................................... 94
2.9 UPLOAD ................................................................................................................. 96
2.10 REBOOT ........................................................ ........................................................ 99
2.11 ALARM MASK ......................................................................................................... 100
2.12 ALARM HISTORY .................................................................................................... 102
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[Figure 1] MOBILE WIMAX System Outline ................................................................. 7
[Figure 2] Frontal view of Mobile WiMAX System ..................................................... 8
[Figure 3] Top view of MOBILE WIMAX System ........................................................ 9
[Figure 4] Bottom view of MOBILE WIMAX System ................................................ 10
[Figure 5] Mobile WiMAX RF Repeater Structure .................................................... 27
[Figure 6] Mobile WiMAX Repeater’ s Interior ........................................................ 28
[Figure 7] Switch Module Feature ............................................................................ 29
[Figure 8] UDC Module Feature ................................................................................ 31
[Figure 9] BPF Module Feature ................................................................................ 32
[Figure 10] HPA Module Feature .............................................................................. 33
[Figure 11] SDM Feature ........................................................................................... 34
[Figure 12] Controller Block Diagram ...................................................................... 36
[Figure 13] PSU Feature ........................................................................................... 38
[Figure 14] MOBILE WIMAX Repeater Block ........................................................... 39
[Figure 15] Switch Module Block ............................................................................. 41
[Figure 16] UDC Block .............................................................................................. 42
[Figure 17] SDM Block .............................................................................................. 43
[Figure 18] PSU Block .............................................................................................. 44
[Figure 19] DL Block ....................................... 오류! 책갈피가 정의되어 있지 않습니다.
[Figure 20] UL Block ....................................... 오류! 책갈피가 정의되어 있지 않습니다.
[Figure 21] DL Over Input and UL Over Output Shutdown Algorithm .................... 45
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[Table 1] System Figures ........................................................................................... 11
[Table 2] Features and Functions ............................................................................. 1 1
[Table 3] Environment Specification ........................................................................ 12
[Table 4] System Specification ................................................................................ 15
[Table 5] Switch Module Specification .................................................................... 16
[Table 6] UDC Specification .................................................................................... 18
[Table 7] BPF Specification ...................................................................................... 20
[Table 8] HPA Electrical Specification ..................................................................... 21
[Table 9] SDM Electrical Characteristic ................................................................... 22
[Table 10] SDM Environment Specification ............................................................. 22
[Table 11] SDM Mechanical Characteristic ............................................................. 22
[Table 12] Controller Characteristic ......................................................................... 23
[Table 13] Controller Mechanical Characteristic ..................................................... 23
[Table 14] Power Source Specification ................................................................... 25
[Table 15] Power Source Output Characteristic ...................................................... 25
[Table 16] Power Source Environment Characteristic ............................................ 26
[Table 17] ASD Function Operation Condition .......................................................... 45
[Table 18] Function and Operation Level ................................................................ 47
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1 System Outline
Mobile WiMAX operates at 2.5GHz frequency band and it offers wireless internet
service at medium to low velocity movement without connection being cutoff.
Mobile WiMAX guarantees mobility and due to inexpensive wireless internet access,
it has become a necessary technology. Generally wireless infrastructures for radio
waves are not serviceable in locations such as in-buildings, islands, mountain
areas and shadow zones. To solve this problem, a repeater system is utilized. This
mobile internet RF repeater system is an OFDMA mobile internet system that allows
services in in-buildings such as offices, underground parking areas, shopping malls,
sub-station locations and small scale areas. This system can provide coverage to
shadow zones where radio waves can’ t penetrate. Some of these locations may
be underground or indoor areas with dense traffic.
<Shadow Zones>
- Underground: subway, underground shopping mall, underground passage,
underground car park, etc.
- Terrestrial: inside large building, tunnel, dense city centers, etc
<In-Building Application> <Subway Application>
<Tunnel Application>
[Figure 1] MOBILE WIMAX System Outline
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2 System Configuration
2.1 Mobile WiMAX
This mobile WiMAX system was developed so that signals could be retransmitted to
shadow zones and thus provide service to these areas. Setup for this unit has become
very common in indoor areas such as underground shadow zones.
Donor antenna and service antenna ports for the repeaters are configured to N-
females while monitoring ports for repeaters are configured to SMA female.
In order for operator’ s to easily understand the repeaters operational status,
Ethernet port is used so that units can be monitored and allow repairs to be easily
made.
For 33dBm repeater: Maximum value of 33dBm/Total can be emitted for forward
and reverse direction.
[Figure 2] Frontal view of Mobile WiMAX System
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2.1.1 Base Station Direction (Donor ANT)
Connect the antenna cables to the donor antenna port which is located on the
top section of the repeater. The donor antenna is installed outside on the
building so that it will be able to receive signals from base station.
[Figure 3] Top view of MOBILE WIMAX System
2.1.2 Service Direction (Service ANT)
The service antenna port which is located at the top section of the repeater
is connected to the service antenna cable. These antennas that are
connected to the repeaters are able to provide service to the Shadow Zone
and allow for a satisfactory smooth signal. So, in order to match site
characteristics with an installation location, an antenna type has to be
determined and connected.
2.1.3 UL CPL (Up Link Coupling)
Up link coupling is for operators to analyze the status of an Up Link path. It
is a port for measuring UL signal waveform and strength.
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[Figure 4] Bottom view of MOBILE WIMAX System
2.1.4 DL CPL (Down Link Coupling)
Down link coupling is for operators to analyze the status of a Down Link
path. It is a port for measuring DL signal waveform and strength.
2.1.5 GUI
Communication is made between repeaters and the PC operation program
via an RJ-45. The GUI confirms that the conditions of the repeater and
status settings are made on the ports.
2.1.6 AC Power
Repeater’ s operational power supply is connected via an AC cable.
2.1.7 DC Battery
When the AC power supply is cutoff, DC +24V battery is implemented as the
back up power source. (Option)
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3 System Figures and Specifications
3.1 MOBILE WIMAX System Specifications
3.1.1 System Figures
Section Features (33dBm Repeater) Notes
Duplexing TDD
Frequency 2,496 ~ 2,690MHz
Output
(Repeaters Final Range)
33dBm/Total (FWD)
33dBm/Total (RVS)
[Table 1] System Figures
3.1.2 Features and Functions
Items
Specifications (33dBm
Repeater)
Notes
RF Connector Type(IN/OUT) N-Type Female
Power Connector Type Waterproof type
Enclosure
Size(W x H x
D)
386mm *334mm *153mm
Mass Less than 25Kg
Structure
Wall Mount Type
Heat Sink Cooling (Natural
Dissipation)
[Table 2] Features and Functions
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3.1.3 Environment Figures
Items Specifications Notes
Operational Temperature
and Humidity Range
-10 ~ +50℃, 5% ~ 95%
Power Consumption Less than 300W
[Table 3] Environment Specification
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3.2 System Specification
3.2.1 System Specification
Section Figures Notes
Frequency 2496 ~ 2690MHz
System delay 5.0usec
For each FA, Maximum
Value
FA delay drift 35 nsec
Frequency Stability ±0.02ppm
Switching time Within 2.5usec Max
Switching time adjustment
range
Within TTG, RTG Section 1usec step
Switching time adjustment
accuracy
Within ± 1us
Pass band Ripple Within ± 1.5dB
System Gain
Down Link 80dB
Up Link 80dB
Gain Control Step Size
0.5dB
Gain Control accuracy Within ± 1dB
Input VSWR Less than 1.4
EVM 3% Source Comparison
Forward input range -50 ~ -20dBm/Total
Noise Figure 5dB
Path isolation More than 120dB Min.
Reverse operating input
range
-50dBm
Pass Band 3dB BW
FA 10MHz Band : Within
11MHz
Each FA
Pass Band 50dB BW
FA 10MHz Band : Within
13MHz
Each FA
Occupied Frequency
Bandwidth
FA 10MHz Band : Within
10MHz
Each FA
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Down Link
Spurious Emission Mask
FA edge±1MHz
More than
Less
than
-40dBc
100KHz
FA
edge±3.5MHz
More than
Less
than
-45dBc
100KHz
Out of Band
Spurious Emission Mask
Under
30MHz~1GHz
Less
than
-13dBm
100KHz
1GHz~12.75GHz
Less
than
-13dBm
1MHz
Up Link
Stop band Rejection
FA edge±1MHz
More than
Less
than
-40dBc
100KHz
FA
edge±3.5MHz
More than
Less
than
-45dBc
100KHz
Reverse Out of Band
Spurious Emission
Under
30MHz~1GHz
Less
than
-13dBm
100KHz
1GHz~12.75GHz
Less
than
-13dBm
1MHz
LED
RF Power
Occurrence of Over Power
Red
VSWR Alarm Occurrence Red
RSSI Alarm Occurrence Red
Over Temp. Alarm Occurrence Red
Undercurrent Alarm Occurrence Red
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Shutdown
DL Input
Level
-14dBm/Total ±2dB
UL Output
Level
35dBm/Total ±2dB
[Table 4] System Specification
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3.3 Main Component Specification
3.3.1 Switch Module Specification
Parameter Specification Remark
Frequency 2496MHz ~ 2690MHz BW=194 MHz
Insertion Loss
1.5dB max.
(Diode 5)
HPA → Service @TTL High
Link → LNA @TTL High
HPA → Link @TTL Low
Service → LNA @TTL Low
VSWR 1.4 max. RF ON Application, All port
Isolation 120 dB min.
HPA → Service @TTL Low
Link → LNA @TTL Low
HPA → Link @TTL High
Service → LNA @TTL High
Switching Time 2.5 ㎲ max. 90% Application.
[Table 5] Switch Module Specification
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3.3.2 UDC (Up/Down Converter) Specification
Parameters Specifications Remark
Frequency1 2518.5MHz BW33MHz
Frequency2 2535MHz BW33MHz
Frequency3 2551.5MHz BW33MHz
Frequency4 2640.5MHz BW33MHz
Frequency5 2657MHz BW33MHz
Frequency6 2673.5MHz BW33MHz
Operational Band
Width
30MHz
System delay 4.7usec
Frequency Stability ±0.02ppm
Passband Ripple Within ± 1 dB -40℃~55℃
System
Gain
Down Link 27dB(@LNA17dB) -40℃~55℃
Up Link 27dB(@LNA17dB) -40℃~55℃
Temp ATT min=8dB(Normal Temperature) @ All path
Rate of Change for
Temperature
±3dB(No temp ATT) -40℃~55℃
Gain Control Step
Size
0.5dB
Gain Control
accuracy
Within 0.7dB
Input VSWR Less than 1.4
EVM 2%
Source
Comparison
(DL64QAM/UL16
QAM)
Tx/Rx input range -17 ~ -47dBm/FA Including LNA
Tx/Rx Output -5dBm
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Noise Figure
5dB
Max (Including
LNA)
12dB
Min (Including
LNA)
OOBE
edge±1.5 ~ 2.5MHz -53dBm/100kHz -40℃~55℃
edge±2.5 ~ 4.5MHz -53dBm/MHz -40℃~55℃
More than
edge±4.5MHz
-82dBm/MHz -40℃~55℃
ALC 30dB
Occupied
Frequency
Bandwidth
Within 30MHz 3FA
Reverse Out of
Band
Spurious Emission
Less than
30MHz~1GHz
Less than
-13dBm
100KHz
1GHz~12GHz
Less than
-13dBm
1MHz
Temperature
For All Conditions
-40℃~55℃
[Table 6] UDC Specification
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3.3.3 BPF Module Specification
3.3.3.1 Electrical Specifications
Donor
Parameters
specifications
Notes
BPF
Frequency Range 2502~2690MHz
Center Frequency 2596MHz
Bandwidth 188MHz
Insertion Loss (Max.) 1.2 dB (Normal Temperature : 1.0 dB)
Return Loss(Min.) 18 dB
Pass Band Ripple (Max.) 0.8 dB
Attenuation(Min.)
2486MHz@20 dBc
2700MHz@30 dBc
Coupling Vale
40±2.0dB(Out Port)
824~894MHz@30dB±2.0dB(In Port)
Operating Temp
-30 ~ +60 ℃
In/ Out Impedance 50 Ω
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Service
Parameters
specifications
Notes
BPF
Frequency Range 2502~2690MHz
Center Frequency 2596MHz
Bandwidth 188MHz
Insertion Loss (Max.) 1.2 dB (Normal Temperature : 1.0 dB)
Return Loss(Min.) 18 dB
Pass Band Ripple (Max.) 0.8 dB
Attenuation(Min.)
2486MHz@20 dBc
2700MHz@30 dBc
Coupling Vale 40±1.5dB(Out Port)
Operating Temp -30 ~ +60 ℃
In/ Out Impedance 50 Ω
[Table 7] BPF Specification
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3.3.4 HPA Specification
Parameters
Specifications for 30dBm Repeater
Remark
Frequency Range 2490~2690MHz
Output Power 36dBm
Gain 40dB ±1dB (min)
Gain Flatness 1.0dB (peak to peak)
Input/Output
VSWR
1.3 :1 (max) to 50Ω
ACP
@ Output Power
OFDM 3FA 36dBm
≤ -20dBm @ Offset
Freq(20MHz), RBW(1MHz)
≤ -20dBm @ Offset
Freq(23MHz), RBW(1MHz)
DC Input Voltage +28V DC
DC Input Current
Typ. 1.2mA, MAX 1.5A (@Vdc= +28V, @OFDM
3FA)
Power Detect
4V@33dBm, (100mV/1dB ),
Detect range : 3dBm ~ 33dBm
Enable (On/Off) Enable : Close /Disable : Open
Over Power Alarm TTL High @ 36dBm
Operating
Temperature
-10 ~ +60℃
Dimension 170 x 140 x 25
RF Connectors SMA Female
Pin Description
(15PinD-SUB
Male)
Pin1, 2, 9, 10 : +28V
Pin3 : HPA Fail Alarm (Shutdown)
Pin4 : Over Temp Alarm (Shutdown)
Pin5 : Over Power Alarm
Pin6 : Over VSWR Alarm
Pin7 : Out Power Det
Pin8 : Enable / Disable
Pin11, 12 : NC
Pin13, 14, 15 : GND
[Table 8] HPA Electrical Specification
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3.3.5 SDM (Sync Detector Module) Specification
3.3.5.1 Electrical Characteristic
Parameter
Specification
Units Remark
min normal max
Input Frequency 2400 2700 MHz
Input Power w/o Damage 0 dBm *Note 1
Normal Input Power -70 -20 dBm *Note 2
Synch Detection Level -70 -20 dBm
Ratio Detection Level -70 -20 dBm
VSWR 2:1
Local Leakage -80 dBm *Note 3
Supply Voltage 4.75 5.5 6 V
Consumption Current 0.3 0.45 1 A 5[V] Range
FA Index Description
0 ~ 775 (Current Frequency) = 2496 MHz + (FA Index * 0.25 MHz)
[Table 9] SDM Electrical Characteristic
3.3.5.2 Environment Specifications
Parameter Specification Remark
Operating Temp. -40~80℃ Humidity 0~90%
Storage Temp.
-40~90℃
-
[Table 10] SDM Environment Specification
3.3.5.3 Mechanical Characteristic
Parameter Specification Remark
Size 110×75×1.6 W×H×D (mm)
Weight TBD
Interface connector 2.54 pitch 2x13
[Table 11] SDM Mechanical Characteristic
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3.3.6 CONTORLLER SPECIFICATION
3.3.6.1 Application Range
Mobile WiMAX repeater’ s control board is applied.
3.3.6.2 Main Characteristic
Items Details
CPU Board Specification
Circuit Version HUEX1101
PCB Version HUEX1101-1
Exterior Size 200mm * 110mm
Thickness, Layer 1.6T, 4 Layer
Main Component
CPU ATmega128 16 MHz
Data Memory
K6X4008C1F-GF70 (4Mbit)
Internal 4kByte EEPROM
Program Memory Internal 1Mbit Flash
Electrical Characteristic
Operation Voltage(Vcc) +7V Æ VCC
Power Stability Element MIC29150-5.0BU
Operational OS uC/OS-II
Temperature Characteristic -30 ~ 80 ℃
[Table 12] Controller Characteristic
3.3.6.3 Mechanical Characteristic
Item Specification
CPU B’ D
FR4 4Layer t=1.6 Size=270mm*240mm
[Table 13] Controller Mechanical Characteristic
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3.3.7 PSU Specification
3.3.7.1 GENERAL CHARACTERISTIC
Items Specification
Input
Input Voltage and
Range
110 ~ 124 or 208 ~ 240VAC (Switch Selection)
Frequency 55 ~ 65Hz
Constant Single Phase
Output
Rated Voltage and
Load Current
+27VDC/5A, +5.5VDC/1.5A,
+7VDC/4A,-27VDC/0.1A
Voltage Fluctuation
Limit
Rated Output Voltage ± Within 2% (Line/Load
Regulation)
Ripple/Spike
Ripple, Spike inclusion, Output Voltage less
than 1% of 10V which is within 100mV
Excess Voltage
(Sudden Load
Change)
Peak Value Less than 1V
Recovery
Time
Less than 35msec
Efficiency More than 75%
Hold-up Time Maintain more than 20msec
Over Voltage
Protection
Output level of 110 ~140% Shutdown Protection
Over Current
Protection
Maximum output current is between 110~140%
for current limit. Auto return Sub-power for over
current protection follows the elements
characteristic.
Arrival Time Rating
For voltage rating, the arrival time is within 100
msecond. OVER&UNDER SHOOT voltage rating
is within 90 ~ 110%
Time Drift
After 30 minutes of operation, when output
voltage is measured, value should be within ±
0.25%
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Over-Heating
Protection
When PSU’ s Base Plate exceeds 100 oC,
system shuts down
BATT. Terminal
Voltage
+21V ±0.5V
[Table 14] Power Source Specification
3.3.7.2 Output Characteristic
Rated Output Io
Ripple & Noise
Vo Tolerance Min Max
+27V ±2% 0.1A 4A 2000mV
+5.5V ±2% 0.1A 1.5A 100mV
+7V ±2% 0.1A 4A 120mV
-27V ±2% 0.01A 0.1A 200mV
[Table 15] Power Source Output Characteristic
3.3.7.3 Environment Characteristic
Specification Items Specification Remarks
Operating Temperature and
Humidity
-30°C/10%~70°C/90%
Storage Temperature and
Humidity
-30°C/10%~70°C/90%
Output Voltage Change 0.05%/°C
Cooling Mode Conduction Cooling Mode
High Temperature Test
Condition (Full load)
For 72 hours at 70°C
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COLD START
Storing the unit at -30°C for 10
hours and then turning it on
[Table 16] Power Source Environment Characteristic
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4 System Structure and Function
4.1 Repeater Structure and Explanation
4.1.1 Repeater External Appearance
Repeater’ s enclosure prevents dust and other pollutant particles from entering and is
designed for wall mount positioning. Heat-sink is placed to dissipate heat.
[Figure 5] Mobile WiMAX RF Repeater Structure
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4.1.2 REPEATER INTERIOR
Structure of the unit is simplified so that maintenance will be easily handled; therefore
the number of modules is minimized. Inside the repeater enclosure, there are 6 modules
that are laid out. These modules are Switch, PSU, HPA, BPF, UDC and Controller.
[Figure 6] Mobile WiMAX Repeater’ s Interior
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4.2 Explanation of Internal Configuration
4.2.1 Switch Module
WIMAX DPDT (Double Pole Double Throw) RF Switch LNA is applied to the
WIMAX RF repeater.
High Isolation values are used for Down Link and Up Link segregation (More
than 120dB). With low insertion loss, Noise Figure value and HPA output loss
can be lowered. When TTL sync is high, downlink path is set and when TTL
sync is low, Up Link path is set.
[Figure 7] Switch Module Feature
4.2.1.1 HPA
HPA is the input signal port for RF signals which travel out the Link and Service port.
4.2.1.2 LNA
Signals make their way into Link and Service ports, whereby weak signals are amplifie
d and exit out of LNA OUT. Signals are then delivered to up/down converter’ s input
port.
4.2.1.3 Service
Service port connects directly to BPF. Based on a switching mechanism, high
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amplified signals enter into the HPA and exit its way out of the service port. The signal
then gets filtered by BPF and travels toward the service antenna. When the switch
module is in a different state, weak signals from the service antenna pass through the
BPF and into the service port. These signals exit the LNA out port to be amplified.
4.2.1.4 Link
The Link port connects directly to BPF. Based on a switching mechanism, high amplifi
ed signals enter into the HPA and exit its way out of the Link port. The signal then get
s filtered by BPF and travels toward the donor antenna. When the switch module is in
a different state, weak signals from the donor antenna pass through the BPF and into
the Link port. These signals exit the LNA out port to be amplified.
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