GS Instech SMT-L33 LTE In-Building RF Repeater User Manual
GS Instruments Co., Ltd. LTE In-Building RF Repeater
User Manual
SmartCell Repeater
User Manual 
33 dBm 
July, 2012
Version 1.0 

User Manual  
SmartCell Repeater 
 2
- INDEX - 
1. INTRODUCTION ............................................................................................................. 3 
1.1 GST SmartCell Repeater Advantages ........................................................................... 5 
1.2 Abbreviation ................................................................................................................. 5 
2. SYSTEM CONFIGURATION ............................................................................................. 7 
2.1 SmartCell Repeater Service Network Configuration .................................................... 7 
2.2 System Design and Operation ...................................................................................... 8 
2.2.1 System Design ....................................................................................................... 8 
2.2.2 Downlink/ Uplink Path ........................................................................................ 10 
2.2.3 700MHz Frequency Selection .............................................................................. 11 
2.2.4 850MHz Frequency Selection .............................................................................. 11 
2.2.5 1900MHz Frequency Selection ............................................................................ 12 
2.2.6 2100MHz Frequency Selection ............................................................................ 13 
3. SETUP ........................................................................................................................... 14 
3.1 Equipment Needed for Repeater Setup ...................................................................... 14 
3.1.1 Check points before turning on the Repeater ...................................................... 14 
3.1.2 Ready for Service ................................................................................................. 15 
3.1.3 Signal Strength LED Check .................................................................................. 15 
3.2 Setting up the Repeater ............................................................................................. 15 
3.2.1 Quick GUI/Configuration ..................................................................................... 16 
3.2.2 Quick Setup ......................................................................................................... 16 
3.3 WebUI Ranges Table .................................................................................................. 16 
3.4 Troubleshooting ......................................................................................................... 17 
3.4.1 Simple Troubleshooting Method .......................................................................... 17 
3.4.2 Alarm Information ............................................................................................... 17 
3.4.3 Troubleshooting Guide Related to RF .................................................................. 
20 
3.4.4 Troubleshooting Guide Related to NMS ............................................................... 22 

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U.S.A. 
U.S.FEDERAL COMMUNICATIONS COMMISSION RADIO FREQUENCY INTERFERENCE 
STATEMENT INFORMATION TO THE USER 
NOTE: This equipment has been tested and found to comply with the limits for a Class A digital 
device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable 
protection against harmful interference when the equipment is operated in a commercial 
environment. This equipment generates, uses, and can radiate radio frequency energy and, if 
not installed and used in accordance with the instruction manual, may cause harmful 
interference to radio communications. Operation of this equipment in a residential area is likely 
to cause harmful interference in which case the user will be required to correct the interference 
at his own expense. 
These limits are designed to provide reasonable protection against harmful interference in a 
residential installation. 
This equipment generates, uses, and can radiate radio frequency energy and, if not installed 
and used in accordance with the instructions, may cause harmful interference to radio 
communications. 
However, there is no guarantee that interference will not occur in a particular Installation. 
If this equipment does cause harmful interference to radio or television reception, which can be 
determined by turning the equipment off and on, the user is encourage to try to correct the 
interference by one or more of the following measures: 
  • Reorient or relocate the receiving antenna. 
  • Increase the separation between the equipment and receiver. 
  • Connect the equipment into an outlet of a circuit different from that to which the 
receiver is connected. 
   • Consult the dealer or an experienced radio/TV technician for assistance. 
Changes or modification not expressly approved by the party responsible for compliance could 
void the user’s authority to operate the equipment. 
Connecting of peripherals requires the use of grounded shielded signal cables. 

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IC Warning 
This device complies with Industry Canada licence-exempt RSS standard(s). 
Operation is subject to the following two conditions:  
(1) this device may not cause interference, and 
(2) this device must accept any interference, including interference that may cause undesired operation of 
the device. 
Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de 
licence. 
L'exploitation est autorisée aux deux conditions suivantes : (1) l'appareil ne doit pas produire de 
brouillage, et 
(2) l'utilisateur de l'appareil doit accepter tout brouillage radioélectrique subi, 
même si le brouillage est susceptible d'en compromettre le fonctionnement. 

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1. INTRODUCTION 
SmartCell is a modular repeater designed to improve signals in blanket/shadow areas inside 
buildings.  It can transmit signals at 700MHz, 850MHz, 1900MHz, and 2100MHz frequencies. 
User may choose filtering configurations according to the specific site’s requirements.  
1.1 GST SmartCell Repeater Advantages 
 It provides selectable RF power levels for any wireless technology / band. 
 It provides monitoring for multiple technologies. 
 Its digital filter provides optimized RF performance. 
 It allows the users to modify the technologies via a web user interface. 
 It is easy to add or change frequencies. 
 It has scalable modular design. 
 Data service is improved by the addition of 4G (LTE). 
 Wall mount or rack mountable single chassis design. 
 AMP modules are interchangeable and hot swappable. 
 Optional low loss multiplexor allows user a centralized cable connection point for 
donor and service antennas. 
 Multiples of same technology amplifiers can be used simultaneously. 
 A single PSU provides power to the entire system up to 4 amplifier modules. 
1.2 Abbreviation 
DFM  Digital Filter Module 
PSU   Power Supply Unit 
ALC   Auto Level Control 
SNMP   Simple Network Management Protocol 
AOC   Auto Oscillation Control 

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          CAUTION 
 THIS EQUIPMENT IS INDOOR USE ALL THE COMMUNICATION WIRINGS ARE LIMITED TO INSIDE OF 
THE BUILDING 
 RISK OF EXPLOSION IF BATTERY ON CONTROLLER BOARD IS REPLACED WITH AN INCORRECT TYPE. 
 DISPOES OF USED BATTERIES ACCORDING TO THE INSTRUCTIONS. 
 THE SOCKET-OUTLET SHALL BE INSTALLED NEAR THE EQUIPMENT SHALL BE EASILY ACCESIBLE. 
 THIS POWER OF THIS SYSTEM SHALL BE SUPPLED THROUGH WIRING INSTALLED IN A NORMAL 
BUILDING. 
IF POWERED DIRECTLY FROM THE MAINS DISTRIBUTION SYSTEM, IT SHALL BE USED ADDITIONAL 
PROTECTION, SUCH AS OVER VOLTAGE PROTECTION DEVICE. 

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2. SYSTEM CONFIGURATION 
2.1 SmartCell Repeater Service Network Configuration 
The SmartCell Modular Repeater is designed to improve coverage and capacity of LTE, PCS, 
Celluar, and AWS services. The repeater can provide in building coverage for all trouble areas. 
SmartCell is easy to install, has remote status monitoring and control functions (NMS System) 
via a wired line and wireless modem.  
<Figure 1> In-building Repeater Service Organization 

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2.2 System Design and Operation 
2.2.1 System Design 
<Figure 2> SmartCell Repeater Front Design 
NO.  PART  NO. PART 
1  SNMP  10 WAN 1 Port 
2  FEU (Cavity Filter), optional 11 WAN 2 Port 
3  Service Unit #1  12 Modem Antenna Connection Port
4  Service Unit #2  13 Donor Port(s) 
5  Service Unit #3  14 Service Port(s) 
6  Service Unit #4  15 Status LED (RUN/Alarm/Shutdown)
7  CLI  16 Input / Output LED 
8 UPS 17 Release Button 
9 LAN Port   
7 
8 
1 
9 
10 
11 
12 
2 3 4 5 6 
13 
14 
16
15
17

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<Figure 3> SmartCell Repeater Back Design 
NO.  PORT  NO. PORT 
1  Main FAN Assembly 4 DC 12V Output Connection
2  PSU FAN  5 Power Cable 
3 Main Power Switch  
1
2 
3 
5 
4

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2.2.2 Downlink/ Uplink Path 
The user may select frequency bands according to the site conditions.  After receiving a signal 
from the donor antenna(s), the repeater improves it and sends a securely isolated signal out to 
the service antenna(s).  Each amplifier module has its own separate  digital filter module (DFM). 
The amplifier module consists of a down converter, up converters, cavity filter, and power 
amplifier (PAU). 
In the Downlink Path: 
1.  RF Signal is received from the donor antenna through the input port. 
2. The signal is then converted from RF to IF, 
3. The IF signal is digitized by the DA converter, 
4. The digital signal is filtered by the DFM (FPGA), 
5. The modulator converts the digital signal to an analog RF signal and transmits to 
the amplifier. 
6. Amplifier outputs final signal to service antennas at desired output power. 
Uplink path works in reverse order.  
<Figure 5> SmartCell Repeater Block Diagram 
DFM 

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2.2.3 700MHz Frequency Selection 
<Figure 6> 700MHz Band Frequency 
The 700MHz AMP module complies with LTE 3GPP requirements, where a maximum of two non-
contiguous block configurations are available.  Each block is adjustable per 5 MHz. 
2.2.4 850MHz Frequency Selection 
<Figure 7> 850MHz Band Frequency 
The 850MHz AMP module provides Cellular service, where a maximum of two non-contiguous 
block configurations are available.  Each block is adjustable to the following bandwidth 
configurations: 
A1: 11MHz 
B1: 10MHz 
A2: 1.5MHz 
B2: 2.5MHz 

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2.2.5 1900MHz Frequency Selection 
<Figure 8> 1900MHz Band Frequency 
The 1900MHz AMP module complies with PCS Band blocks, where a maximum of three non-
contiguous filtering configurations are available. Each sub block is adjustable per 1.25MHz 
bandwidth steps up to 20MHz.  The Following table shows user selectable channel numbers.  
BAND  DL CENTER 
[MHz]  CHANNEL  BAND  DL CENTER 
[MHz]  CHANNEL 
A 
A1  1931.25  25  guard 1965  700 
1932.5  50  E  1966.25  725 
1933.75  75  1967.5  750 
guard  1935  100  1968.75  775 
A2  1936.25  125  guard 1970  800 
1937.5  150  F  1971.25  825 
1938.75  175  1972.5  850 
guard 1940  200  1973.75  875 
A3  1941.25  225  guard 1975  900 
1942.5  250 
C 
C1  1976.25  925 
1943.75  275  1977.5  950 
guard 1945  300  1978.75  975 
D  1946.25  325  guard 1980  1000 
1947.5  350  C2  1981.25  1025 
1948.75  375  1982.5  1050 
  guard 1950  400  1983.75  1075 
B 
B1  1951.25  425  guard 1985  1100 
1952.5  450  C3  1986.25  1125 
1953.75  475  1987.5  1150 
guard 1955  500  1988.75  1175 
B2  1956.25  525 
 G 1992.5 
1225 
1957.5  550 
1958.75  575  1250 
guard 1960  600 
B3  1961.25  625  1275 1962.5  650 
1963.75  675 

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2.2.6 2100MHz Frequency Selection 
<Figure 9> 2100MHz Band Frequency 
The 2100MHz AMP module complies with CDMA band requirements, where two block 
configurations are available. In order to set contiguous band F, check ‘Band F1’, ‘Band F2’ and 
‘contiguous’ button in the WEB UI. In order to set Band F1 or Band 2 do not check ‘contiguous’ 
button in WEB UI.  Band F configuration is as follows: 
BAND  Downlink  Uplink 
Start  Stop  Start  Stop 
F 
F1  2145.15  2149.85  1745.15  1749.85 
guard  -  -  -  - 
F2  2150.15  2154.85  1750.15  1754.85 
F1 F2 

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3. SETUP 
3.1 Equipment Needed for Repeater Setup  
Paramete
r
 Item
Q
uantit
y
Remark
Major Component  SmartCell Repeater  1 EA  Provided by GST 
Additional  
Components 
Wall Mountin
g
 Bracket
CD which contains User Manual 
and Installation Guide  
Ethernet Cable 6.6ft (2m) 
Ground Cable 6.6ft (2m) 
Ground Sems Screw M4 x 8mm 
Bracket Sems Screw M5 x 10mm
Lag Screw 12.7mm x 50.8mm 
FEU-AMP RF cable 
FEU-Wall Bracket RF cable 
Modem-FEU RF Cable 
1 EA
1 EA 
1 EA 
1 EA 
4 EA 
20 EA 
4 EA 
8 EA 
2 EA 
1EA 
Provided by GST 
Antenna  Donor ANT
Server ANT 
1 EA
1 EA  Not Included 
RF Cable  Antenna connection Cable
T
BD Not Included
T
estin
g
 and Measurin
g
Equipment  Spectrum Analyzer  1 EA  Not Included 
3.1.1 Check points before turning on the Repeater 
1)  System Power Check: AC electrical power to the repeater should be 110V.  Input 
electricity only after power verification.  
2) Input RF Signal Range: Optimal input RSSI into the repeater is -57dBm ~ -27dBm for      
700MHz/850MHz/1900MHz/2100MHz. User should verify input condition of Donor ANT.  If the 
input RSSI exceeds -27dBm, then external attenuators should be added. 
3) Isolation check between DONOR/SERVER ANT: Isolation condition of this equipment is 
105dBc (Gain+15dB).  The User should check this condition before installation. 

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3.1.2 Ready for Service 
1. Check points before Service: 
 a. Verification of system installation: 
- Electricity, In/Out antennas, cable connections, and equipment mounting.  
 b. Verification of system accessories: 
- User should check all necessary accessories.  
 c. Check received signal level: 
- User should check whether environmental conditions are in accordance with system 
specifications to ensure the system operation will be optimized. 
2. Check points after Service:  
a. Check external LEDs 
1) RUN: Green light ON   (Off: all lights off). 
2) ALARM: Green light in normal status, Red light in alarm. 
3) SHUT DOWN: Green light in normal status, Red light in Shutdown.   
3.1.3 Signal Strength LED Check 
Number of LED bars  Input Signal Level Output Power Signal Level
LED 1 bar  Less than -86dBm Less than +5dBm
LED 2 bars  -85dBm ~ -79dBm +6dBm ~ +10dBm
LED 3 bars  -78dBm ~ -72dBm +11dBm ~ +15dBm
LED 4 bars  -71dBm ~ -65dBm +16dBm ~ +20dBm
LED 5 bars  More than -64dBm More than +21dBm
Figure 9> Modular Repeater Front LED 
4.2 Setting up the Repeater 

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3.2.1 Quick GUI/Configuration 
Use the following steps to commission the Repeater after all the cabling and antennas are fixed 
in place and the Repeater is supplied with proper electrical power.  The repeater will need a 
stable Downlink RSSI input level in the range of -85dBm to -60dBm. 
1. Connect your laptop to the LAN port on the repeater with a Crossover Ethernet cable. 
2. Verify your laptop has all wireless connections turned off and is set to obtain an IP 
address automatically, or you may use a fixed IP address: 172.16.6.82, with a Subnet 
Mask of 255.255.255.252, no default Gateway. 
3. Open web browser and enter: 172.16.6.81. 
4. User name: admin. 
5. Password: admin. 
3.2.2 Quick Setup 
1. Go to the RF Configuration page. 
2. Before the Amplifier (HPA) can be turned on, set the Uplink and Downlink attenuation 
(ATT) to the maximum value and click Apply. 
3. Select the correct Band Block and set the ALC Downlink and Uplink Limits to the desired   
level and click Apply. (To adjust the Output Power, change the ALC Downlink and Uplink 
Limits to the desired levels). 
4. To check the Repeater’s status, click on the Status page. 
5. To change the Repeater’s gain, adjust the Uplink and Downlink attenuation in equal 
amounts not more than 5dB at a time and click Apply. 
3.3 WebUI Ranges Table 
GUI Feature Range Description 
Downlink and Uplink Output 
Power Display  Below 0dBm to 35dBm The output Power of the Repeater 
Downlink Low RF Power  2dB to 10dB  Threshold for Low RF Power 
Downlink and Uplink 
Attenuation Control  0dB to 30dB  Reduces Gain Internally 
Downlink and Uplink ALC Limit  0dBm to 33dBm  Limits Output Power 
Downlink RSSI Display  -100dBm to -27dBm  Downlink Receive Level at Donor 
Antenna Port 
Downlink Low RSSI  -93dBm to -57dBm  Threshold for Low RSSI 
Downlink and Uplink AMP  On/Off  High Powered Amplifier 

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Control 
Gain Balance Control  On/Off  Equalizes Uplink and Downlink Gain 
Gain Balance Value  0dB to 15dB  Subtract Uplink Gain by G/B Value 
Shutdown Control  On/Off  Shutdown if Major Alarm is Reported 
Auto Gain Setting  On/Off  Automatic Gain Setting for the Repeater
Auto Oscillation Control  On/Off  Prevents Oscillation 
Temperature Display  32 to 260.6 Degrees  Internal Repeater Temperature 
AMP Temperature Upper Limit  0 to 299 Degrees  Threshold for Temperature Alarm 
Band Blocks Used/Bandwidth  Each AMP  The Channel the Repeater will be using
Delay Alarm Report  0 or 5 Minutes  Time Delay of Reporting after Alarm is 
Detected 
3.4 Troubleshooting 
In case of abnormal operation, technician should diagnose abnormality via remote access or 
directly connecting to repeater using Ethernet cable.  If technician is required to conduct repairs 
due to major alarm, repeater should first be powered off, and then technician should prepare 
the proper measurement equipment before trying to fix the problem.   
3.4.1 Simple Troubleshooting Method 
1) Verify LED Status, both on external LED’s as well as internal module LED’s 
- Normal operation: Green light on.  Alarming: Red LED on. 
2) Technician should check external and internal connectors to ensure all connections are tightly 
secure.  These connectors should be cleaned regularly. 
3) If technician thinks there is a serious problem, call technical support.   
1-866-9-GST-USA (1-866-947-8872) 
3.4.2 Alarm Information 
Alarm 
Name  What causes this 
alarm  Troubleshooting Methods 
Downlink 
Spurious 
emissions 
out of spec  
Downlink Output Pow
er exceeds Downlink 
Upper Limit 
* The Downlink Output Power should not exceed the m
aximum composite power spec for this unit. 
* If the Downlink Output Power is not exceeding the co
mposite power spec for this unit, try to increase the Do
wnlink Upper Limit on the RF Configuration Page. 
* Add equal amounts of Uplink and Downlink attenuati
on until the Downlink Output Power is less than the Do
wnlink Upper Limit. 
* Set the ALC Downlink Limit on the RF Configuration P
age to a value lower than the Downlink Upper Limit 
Downlink Har
dware failure  Downlink path gain is 
6dB less than RSSI pl * By default, if the Downlink Low Output Variance is se
t to 10dB, the Repeater will not report this alarm. 

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us Output Power  * Increase the Downlink Low Output Variance on the R
F Configuration Page. 
Downlink Do
nor power to
o low 
Input RSSI from Dono
r site is 8dB less than 
Downlink Low Input Li
mit 
* By default, if the RSSI Lower Limit is set to -
93dBm, the Repeater will not report this alarm. 
* Decrease the Downlink Low RSSI Limit level on the R
F Configuration Page. 
* Increase the RSSI level into the Repeater. 
Downlink VS
WR 
When the VSWR Ratio
 on the Server Port is 
greater than 3 : 1 
* "Sweep the line" to check for loose or damaged conn
ectors and/or cabling. 
* If after checking the entire Server side, the VSWR ala
rm still exists and the system is working fine, Disable th
e alarm on the Alarm Configuration page. 
Downlink Do
nor power to
o high 
Downlink Input Power 
is greater than -
25dBm 
* Check position of the Donor antenna. 
* Add attenuator to the Donor port at the highest input
 power level. 
Downlink Syn
thesizer failur
e 
Failure of the 
synthesizer Downlink 
path  
* Turn OFF/ON the System by pressing ON/OFF button 
on the back side panel. 
* Call GST’s Tech Support Team and exchange the AMP
 unit. 
Downlink Int
erfere power 
exceeded 
Out-
band signal is about 1
5dB greater than in-
band signal 
* Call GST’s Tech Support Team for further instructions.
Uplink Out of
 band emissi
ons out of sp
ec 
Uplink Output Power e
xceeds Uplink Upper L
imit 
* The Uplink Output Power should not exceed the maxi
mum composite power spec for this unit. 
* If the Uplink Output Power is not exceeding the comp
osite power spec for this unit, try to increase the Uplink
 Upper Limit on the RF Configuration Page. 
* Add equal amounts of Uplink and Downlink attenuati
on until the Uplink Output Power is less than the Uplink
 Upper Limit. 
* Set the ALC Uplink Limit on the RF Configuration Pag
e to a value lower than the Uplink Upper Limit 
Uplink Power
 at coverage 
port too high 
Uplink Input Power is 
greater than -25dBm 
* Check position of the Coverage antenna. 
* Add attenuator to the coverage port or use another d
evice to regulate Uplink output power. 
Uplink Synth
esizer failure 
(Uplink Hard
ware failure) 
Failure of the 
synthesizer Uplink 
path 
* Turn OFF/ON the System by pressing ON/OFF button 
on the back side panel. 
* Call to GST’s Tech Support Team and exchange the A
MP unit. 
Uplink (Down
link) Softwar
e failure 
Alarming in DFM of 
the amplifier unit 
* Turn OFF/ON the System by pressing ON/OFF button 
on the back side panel. 
* Call to GST’s Tech Support Team and exchange the A
MP unit. 
Oscillation de
tected/Low is
olation 
Insufficient isolation is
 detected when the R
epeater is at minimum
 gain 
* Verify that the Donor antenna is on the same side of 
the building as the Donor site, and if needed, raise the 
Donor antenna up on a pole. 
* Change the types of antennas used, such as Yagi to 
Corner-
Reflector for outdoors, and Omni to a Panel for indoor 

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use. 
* Move the closest indoor service antenna farther away
 from the outside Donor antenna. 
* Close the repeater door if opened and verify that the 
closest indoor coverage antenna is not in the same roo
m as the repeater. 
Field Replace
able module 
failure 
Mismatch of AMP unit 
and filter service in DF
M 
* Call GST's Tech Support Team to verify all the setting
s are correct. 
Tamper Dete
cted 
Change of mounting i
nformation in the Syst
em 
* Wait 5 minutes to clear alarm automatically. 
* If you want to disable, you can on the Alarm Configur
ation page. 
Communicati
on Failure  Bad connection of NM
S board and AMP unit  * SNMP board or AMP unit need to reset. 
* Open the rear cover and check the each cable. 
Power Suppl
y out of rang
e 
The internal Power Su
pply detects improper 
Voltage 
* If the system is working fine, disable the alarm on th
e Alarm Configuration page. 
* Call to GST's Tech Support Team to verify that all the 
settings are correct. 
Over Temper
ature 
Internal AMP tempera
ture exceeds the Tem
perature Limit 
* Verify the Temperature Limit is set between 176 °F ~
 201 °F on the RF Configuration page. (Default Value is
 163°F) 
Reset alarm  During reset of the un
it,  * Wait 30 seconds to clear alarm automatically. 
Manual Shut
down 
During the shutdown 
algorithm after re-
check the system is co
mpletely shut downed
. 
* Turn OFF/ON the System by pressing ON/OFF button 
on the back side panel. 
* Reset AMP unit in WebUI. 
FAN  FAN Failure  * Replace FAN. 

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3.4.3 Troubleshooting Guide Related to RF 
Item  Check Point  Troubleshooting 
Check before 
system 
operation 
System input power 
range  -Downlink: -100dBm ~ -27dBm 
-Uplink: -100dBm ~ -27dBm 
System gain 
(DL/UL)  - 60dB ~ 90dB 
Output power 
at server port  - Downlink: 33dBm ± 2dB 
- Uplink: 33dBm ± 2dB 
Check points before open 
for service 
-Please check quantity of all accessories with 
specification before you set up 
-Fit cable length in accordance with field condition 
Check after 
system 
operation 
Check points after open 
for service 
Check following status; 
-Verify the antennas are securely mounted and 
pointed in the correct directions 
-Connection status between antennas and RF cable
-Verify the Repeater is securely mounted 
-Proper AC power status 
-Grounding status of electrical circuit 
-Coaxial cable (RF) construction status 
-Connectors and combiners connection status 
-Cable connection status against leakage of water 
When 
repeater 
does not 
work 
properly 
Check electricity cord 
connection status  -Re-plug in Adapter cord 
When in 
alarming 
DL VSWR alarm 
Check following status; 
-Make sure Server Antenna Port is disconnected.  
-Reset Adapter upon completing Alarm                     
troubleshooting 
DL over-output alarm  -Make sure output power is operating normally 
-Reset Adapter upon completing Alarm 
troubleshooting 
UL over-output alarm  -Make sure output level is operating normally 
-Reset Adapter upon completing Alarm               
troubleshooting 
Temperature alarm 
Check following status; 
-Setting level of maximum temperature limit 
-Temperature offset is normal or not 
-Circumstances of temperature 
-Reset Adapter upon completing Alarm              
troubleshooting 
RF off  -Verify the HPA’s are On 
-Reset Adapter upon completing Alarm              
troubleshooting 
When output 
power is  no 
longer 
Technician should verify 
category of alarm at the 
front side of repeater 
-Red light on the Shutdown LED, technician should 
troubleshoot the alarm via Notebook computer 

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problem -Technician should 
connect antenna with 
output port of repeater 
-Make sure all connectors 
are fastened 
-Reconnect the connector 
-Change it if the connector is defective 
Check the input level  -Increase output power or check input change of 
BTS side 
Check gain of the unit  -If the Gain is different from normal level, please 
contact GST’s Technical Support 
Cable connector loose  -It is possible for connectors to get too tight and 
damage the equipment or throughput 
-Contact installer or service provider 
In case of 
dropped call 
or bad signal 
after set up 
Check input signal 
strength in the service 
area 
-Increase output power level of repeater by 
adjusting attenuation level 
If input signal strength is 
not a problem, please 
check delay of calling 
time 
-Increase output level of Uplink signal, then set to 
optimal level. 
Check RSSI signal 
strength  -Contact network management team or service  
provider 
In case 
output Signal 
wavelength is 
not shown 
flat or looks 
like 
oscillation 
Check connection 
fastened between 
antenna and cable 
(Signal wavelength 
should be flat and stable 
if technicians shake 
CABLE. If not, it is 
connection problem) 
-If connection is not proper, reconnect cable and 
connector and then check the output power again 
Input level change or    
module overheating 
-Check input level from BTS side. 
-Check performance of each module (Diagnosed by 
GST’s Technical Supportm) 
Please check VSWR of 
the cable is normal  -Change to normal Cable 

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3.4.4 Troubleshooting Guide Related to NMS 
Symptom  Check Points  Troubleshooting 
Link Fail 
Communication problem -In case of Ethernet, verify IP addressing, DHCP 
function, and that cookies are deleted 
-Verify that a crossover Ethernet cable is being used
CLI connection, cable     
status check 
-Make sure 1:1 connection 
-Follow instructions in the installation guide for this 
connection procedure 
CLI connection Check by 
USB to serial cable  -Verify port number of PC communication 
-Check cable connection status 
If technician thinks there is a serious problem, call GST’s Technical support.   
1-866-9-GST-USA    (1-866-947-8872). 

MPE Information 
ⓒ SAMSUNG Electronics Co., Ltd. 
 Warning: Exposure to Radio Frequency Radiation The radiated output power 
of this device is far below the FCC radio frequency exposure limits. 
Nevertheless, the device should be used in such a manner that the potential 
for human contact during normal operation is minimized. In order to avoid 
the possibility of exceeding the FCC radio frequency exposure limits, human 
proximity to the antenna should not be less than 50 cm during normal 
operation. The gain of the antenna is 8.0 dBi.The antenna(s) used for this 
transmitter must not be co-located or operating in conjunction with any other 
antenna or transmitter.