SOLiD 700P800P Multiple-Enclosure Booster System User Manual PS Manual SC MRU700PS800PS AC

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The following shows dimension of the mounting point for the stacked bracket.
Figure 5.17 – ROU installation diagram for stacked mounting
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ROU Rack Mount Installation
There are two ways to install rack mount. One is to install ROUs on the rack vertically: the other is to
install ROUs on the rack horizontally
Type1 : Vertical installation on the rack
For vertcal installation, a vertical bracket is needed.
First, install bracket for vertical installation on the rack
Second, mount MRU on the left side of the installed bracket
Third, mount ARU on the right side of the installed bracket
Completed installation diagram is as follows
Figure 5.18 – ROU installation procedure for vertical rack
The following shows dimension of the mounting point for vertical installation
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Figure 5.19 – ROU installation diagram for vertical rack
Type2 : Horizontal installation on the rack
For Horizontal installation, horizontal bracket is needed. Unlike vertical installation, the MRU is
mounted on the right of the installed bracket first and then ARU is installed to the left of MRU
First, install bracket for horizontal installation on the rack
Second, open the front cover of horizontal bracket
Third, mount MRU on the right side of the installed bracket
Fourth, mount ARU on the left side of the installed bracket
Finally, close the front cover of horizontal bracket
Completed installation diagram is as follows
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Figure 5.20 – ROU installation procedure for horizontal rack
The following shows dimensions of the mounting point for horizontal installation
Figure 5.21 – ROU installation diagram for horizontal rack
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ROU components
The ROU has the following components:
No.
Unit
Description
Enclosure
MRU
Power Cable
Enclosure
Power Cable
ARU
RF cable for
optical
RF cable for
antenna
Remark
Including Wall cradle
1EA
‐ Connector with 3 hole to AC 120 plug(AC)
1EA(Optical for
‐ Connector with 2 lug termination(DC)
AC or DC)
Including Wall cradle
1EA
‐ Connector with 3 hole to AC 120 plug(AC)
1EA(Optical for
‐ Connector with 2 lug termination(DC)
AC or DC)
‐ Two RF cables and one signal cable
‐ Two RF cables
5.3.2 ROU Power Cabling
The ROU supports both of DC‐48V and AC120V input power. The type of input power for the ROU is
already determined at the factory. The ROU is shipped with the correct power cable in the package
box. See the UL name plate of the ROU to determine the input power type of the ROU or see the
power connector in the below picture. You should order the type of input power as your application.
(a)AC/DC
(b)DC/DC
Figure 5.22 – ROU Power Port view
Check if your power cord connector is the same as one seen in the table above. The ROU does not
have power switch to power on/off. Power supply is on when cord is plugged into the AC source.
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5.3.3 Optical Cabling
The MRU makes the optical‐RF conversion of TX signals from upper the ODU and OEU as well as the
RF‐ optical conversion of RX signals. The MRU has one optical module in it. As WDM is used in the
R_OPT module, two separate wavelengths (TX:1310nm, RX:1550nm) can be sent/received with one
fiber strand at the same time. The MRU has SC/APC connectors.
To prevent the fiber interface from being marred with dirt, it should be covered with a cap when not
installed. Fiber connectors should be cleaned alcohocol to remove dirt before installation .
Figure 5.23 – ROU optical Port view
Only the MRU has optical port; there is no optical port on the ARU
5.3.4 GND Terminal Connection
TheROU has one GND terminal port on bottom side, as shown below
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Figure 5.24 – ROU GND Port view
Take off the GND terminal port from the enclosure and connect to the ground cable.
Then reconnect it to the enclosure
The opposite end of the ground cable should connect to the communication GND of
building
The ground lug is designed meeting the SQ5.5 standard
5.3.5 Coaxial cable and Antenna Connection
The coaxial cables which are connected to DAS connect to antenna port of the ROU.
Before connection, check the VSWR of the coaxial cable using a SiteMaster to verify
whether it is within tolerance.
The Return loss should be better than 15dB or VSWR should be below 1.5: 1.
Make sure the antenna connector is tightened properly and free of any dirt or insects.
The antenna connected to the ROU is only for inbuilding use.
Only the MRU has an antenna port. The ARU transmits its signal through RF cable
connected to both the MRU and ARU
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5.3.6 LED explanation on ROU
The ROU has an LED panel at the bottom of ROU. The LED indicator is explained below
Description
LED
Power is not supplied
ON
Power is supplied.
Normal Operation
ALM
Abnormal Operation
R‐OPT is normal operation
OPT
R‐OPT is abnormal Operation
TXD
Flashing when data send to upper unit
Flashing when data receive from upper
RXD
unit
Figure 5.25 – ROU LED indicator information
5.3.7 ROU Power consumption
The following table shows power consumption of the ROU
Part
Unit
Consumption Power
1900P+850C supporting ARU
50W
Dual Band
45W
Single Band
MRU 700LTE+AWS‐1
50W
Dual Band
MRU 700PS+800PS
50W
Dual Band
700LTE+AWS‐1
40W
Dual Band
700LTE+AWS‐1
1900P
MRU
ARU
Remark
supporting
ARU
900I+800I
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900I+800I
44W
Dual Band
5.3.8 Cable connection between MRU and ARU
MRU has only antenna port, ARU output port should be connected with MRU. MRU transmit all
frequency band into one antenna after combining with ARU signal
Figure below shows connection diagram between MRU and ARU
(a)MRU1900P+850C/ARU700LTE/AWS‐1
(b)MRU1900P/ARU900I/800I
Figure 5.26 – Cable connection between MRU and ARU
Cable
Description
MRU Name
ARU Name
①
Coaxial cable
High
High
②
Coaxial cable
Low
Low
③
Coaxial cable
TX
TX
④
Caaxial cable
RX
RX
⑤
Signal cable
External port
External port
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Remark
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5.4 OEU Installation
OEU is used to expand the ROU in a multi building environment.
The OEU is located at a Remote Closet. As it can be equipped with up to two DOUs, you can
expand a total of eight ROUs.
5.4.1 OEU chassis installation
The OEU chassis is 2RU in sizeand can be inserted into a 19” Standard Rack. The OEU is in a Remote
Closet, providing optical ports for the ROU.
The following table shows power consumption of OEU:
No.
Common Part
Optional Part
Unit
Chassis
Description
Including EWDM,ERF,EPSU,ECPU,
19”,2U
Power Cable
‐48Vdc Input with two lug terminal
DOU
Optical Module with 4 Optic Ports
Remark
1EA
1EA
Up to 2EA to be
inserted
5.4.2 OEU Power Cabling
The input power of the OEU is ‐48VDC. You need to connect a DC cable with the Terminal Block seen
at the rear of theOEU.
Terminal
‐48V
NC
GND
Color of cable
Blue color
Description
Remark
Input range: ‐42 to ‐56Vdc
Not Connected
Black color
Before connecting the power terminal, Verify that ‐48VDC is present by connecting the power supply
to a DVM with “‐“ terminal to positive and “+” terminal to GND of the DVM. If voltage is correct,
connect the power terminal through the terminal seen below.
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Figure 5.26 – OEU Power interface diagram
Note that OEU does not operate if the “+” terminal and the “–“ terminal of the ‐48V power
supply are reversed.
5.4.3 OEU Optic Cabling
The OEU is connected with the upper ODU. With the DOU inserted in it, the unit is connected with
theROU.
Having EWDM built in the OEU, it makes the RF‐optical conversion of TX signals from ODU as well as
the optical‐RF conversion of RX signals. In addition, the OEU can be equipped with up to two DOUs.
One DOU supports four optical ports and one optical port can be connected with the ROU. With
WDM in the DOU, the unit can concurrently send/receive two different wavelengths (TX:1310nm,
RX:1550nm) through one strand of fiber. The DOU has SC/APC connectors.
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Figure 5.27 – Optical cable with SC/ACP Type Connectors
SC/APC type connectors must be used. To prevent the optical access part from being marred with
dirt, it should be covered with a cap when not installed. Connectors should be cleaned with alcohol
before they are installed.
5.4.4 DOU installation with an OEU
Up to two DOUs can be inserted into an OEU chassis. The DOU module is a Plug in Play type.
When you insert the DOU into the OEU, insert it into the top DOU 1 slot first. Slot numbers are
silkscreened on the left.
The following figure shows installation diagram of an OEU with one DOU inserted in it.
The following figure shows installation diagram of an OEU with two DOUs inserted in it.
Figure 5.28 – OEU with DOUs inserted
When you insert a DOU into OEU, use the DOU 1slot first. For unused slots, you nedd to
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install BLANK UNIT into them.
5.4.5 OEU Power Consumption
The OEU has a ‐48V DC Power supply in it. The OEU can be equipped with up to two DOUs.
Depending on the number of DOUs, power consumption will vary.
The following table shows power consumption of the OEU:
Part
Unit
Consumption Power
Remark
Shelf
EWDM
Common Part
12W
ERF
EPSU
OEU_4
DOU 1 EA
23W
OEU_8
DOU 2 EA
39W
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Section6
Operation
6.1 BIU Operation
6.2 ROU Operation
6.3 OEU Operation
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This chapter describes operation of SC‐DAS. It deals with procedures and operations for normal
system operation after installation. It also describes operations per unit and interworking methods.
6.1 BIU Overview
6.1.1 BIU
Figure 6.1 – SC‐DAS Link budget for the BIU
6.1.2 BIU TX parameters
The TX level to be sent to the BIU should be in the range of ‐20dBm to + 10dBm. If the level exceeds
the range, you need to connect an attenuator to the front end of the BIU input and adjust the level in
the corresponding range. If TX input is too low, maximum power cannot be achieved so you need to
increase the output power of BDA or adjust attenuation amount of BTS’s coupler adjust the level of
the ATT.
Using a spectrum analyzer, check all bands and verify if they are in an appropriate level before
making connection with input port of the BIU. Last, check to see if there are spurious signals.
Select an MDBU with the desired frequency bands and . insert it into the BIU and check to see if it
works normally. For the MDBU, up to two TX inputs are provided. Input level per port is ‐20dBm
to+10dBm.
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Checking the status of the system’s LED Indicator
After turning on the switch of the power supply in BIU, check information on each module’s
LED of the system. The table below shows normal/abnormal cases depending on the status
of each module’s LED.
LED information
Unit
LED
ON
MDBU
Indicates
Green: MDBU is normally power‐supplied.
Green: MDBU is normal.
ALM
Red: MDBU is abnormal; check the alarm through RS‐232C.
MCPU
ON
Green: MCPU is normally power‐supplied.
TXD
Green flicker: TX signals are transmitted to communicate with ROU.
RXD
Green flicker: RX signals are received from ROU.
Green: BIU system is normal.
ALM
Red: BIU system is abnormal; check the alarm through RS‐232C.
ON
MPSU
Green: BIU is connected with power and MPSU works normally.
Green: DC output is normal.
ALM
Red: DC output is abnormal.
MDBU Setting
Insert the MDBU into the BIU. Check if the “ON” LED Indicator at the front panel of MDBU is lit
green. Make a connection with DEBUG port of the MCPU through USB Cable
Check if the ID of MDBU module is located in those SISO MDBU#1& 2,MIMO MDBU#1& 2 slots of the
MDBU through the GUI. When you select the tab of a corresponding slot from the main window, you
can inquire and set the status of a corresponding MDBU module.
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Figure 6.2 –MDBU information assigned at theBIU
Check if the MDBU is inserted into a corresponding slot of theBIU. The ID screen shows the following:
A.
MDBU ID: Show MDBU ID inserted into slot
B.
Not Insert: This status value appears when MDBU has not been set.
C.
Link Fail: This status value appears when MDBU has been set but it fails to communicate
with modules.
SC‐DAS is classfied according to path that is as SISO and MIMO. Each path can have up to two
MDBUs. These MDBUs can be different combinations as per your application
Use the ON/OFF (Activation/de‐activation) function for a port you want to use and turn it ON.
Figure 6.3 –MDBU menu information at the BIU
. Make sure to turn OFF unused ports.
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The table below shows output power vs number of ports
MDBU Band
Output level (Composite power)
No. of Max port (N)
700LTE
7dBm‐10*LOG(N)
850Cellular
7dBm‐10*LOG(N)
1900PCS
8dBm‐10*LOG(N)
AWS‐1
8dBm‐10*LOG(N)
900I
7dBm‐10*LOG(N)
800I
7dBm‐10*LOG(N)
700PS
7dBm‐10*LOG(N)
800PS
7dBm‐10*LOG(N)
Check if the level of TX IN POWER is the same as the value measured with spectrum analyzer(Within
±3dB). Use TX IN AGC function and automatically set internal ATT depending on input level. ATT is
automatically set based on ‐20dBm of input . The table below shows TX IN ATT depending on TX IN
POWER. For manual setting, you can set ATT depending on input according to the table.
TX IN POWER
TX IN ATT
TX IN POWER
TX IN ATT
TX IN POWER
TX IN ATT
‐20dBm
0dB
‐9dBm
11dB
+1dBm
21dB
‐19dBm
1dB
‐8dBm
12dB
+2dBm
22dB
‐18dBm
2dB
‐7dBm
13dB
+3dBm
23dB
‐17dBm
3dB
‐6dBm
14dB
+4dBm
24dB
‐16dBm
4dB
‐5dBm
15dB
+5dBm
25dB
‐15dBm
5dB
‐4dBm
16dB
+6dBm
26dB
‐14dBm
6dB
‐3dBm
17dB
+7dBm
27dB
‐13dBm
7dB
‐2dBm
18dB
+8dBm
28dB
‐12dBm
8dB
‐1dBm
19dB
+9dBm
29dB
‐11dBm
9dB
0dBm
20dB
+10dBm
30dB
‐10dBm
10dB
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The MDBU cards in the BIU provide ALC (Auto Level Control) functionality for each of the inputs to
limit the maximum power output per carrier input. The input level starts activating ALC at ‐20dBm
when turning the ALC on. For correct parameter settings, first, perform the input AGC and then
turn the ALC function on.
Edit the port name and set it as a desired character string (up to 12 characters).For example, the
figure below shows a screen when you set “VzW” for port 1 and “AT&T” for port 2.
Figure 6.4 –MDBU name assignment at theBIU
This naming is reflected at the tree as follows
Figure 6.5 –MDBU name assignment at the tree
Use various upper/lower limits. The following table shows recommended limit settings:
Item
Recommended Limit
Remark
TX IN HIGH ALM
15dBm
Alarm
TX IN LOW ALM
‐25dBm
Alarm
RX OUT ALC
0dBm
Auto Level control
RX OUT HIGH ALM
5dBm
Alarm
After you finish setting normal input levels and alarm limits, check to see if the MODULE FAILURE
LED Indicator is lit green (Normal case).
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Figure 6.6 –MDBU Module Failure information at the BIU
6.1.3 BIU RX parameters
For RX operation at BIU, you need to set RX gain to prevent the BTS or BDA from being
affected. There is an ATT setting window to let you adjust gain per band and port.
Total RX gain is 50dB per band. To adjust a desired gain, you need to do the following. For a
desired RX gain, you can set it as 50dB‐RX ATT. Use the terminal and check if TX Adjust value
and Ec/Io value is appropriate.
To prevent high level signals from entering the BTS or BDA, keep ALC mode activated (ON).
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6.1.4 BIU Logic Sequence Diagram
The BIU controls the overall system, working as as the head end unit of any system. The BIU
connects with units such as ODU, OEU and ROU.
The tree hierarchy automatically displays the components connected to the system and
communicate with lower units while collecting the status of the units.
The menu below shows topology for overall units.
Basic topology for SC‐DAS
Configuration of BIU‐ODU‐ROU
Figure 6.7 –Configuration of BIU‐ODU‐ROU for basic topology
The BIU has two paths : SISO and MIMO. Each path has capability to connect up to 4ODUs,
one ODU can be connected up to 8ROUs.Therefore, the number of ROUs per path is 32.
Regarding the MIMO path, One BIU can connect up to 64 ROUs
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Expansion topology for SC‐DAS
Configuration of BIU‐ODU‐OEU‐ROU
Figure 6.8 –Configuration of BIU‐ODU‐ROU for expansion topology
Using an OEU allows you to expand for additional ROUs as shown in the tree structures.
Looking at the above tree hierarchy, an OEU can be connected with ODU1and2 only and
regarding the optical port of a DOU, the OEU can only connect to the fourth optical port. If
you try to connect the OEU ports 1 thru 3
of the DOU, the BIU won’t communicate with it.
This tree hierarchy is generated automatically as the ROU/OEU is connected at the ODU
optical port
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6.1.5 Interaction with the BIU
The BIU can be equipped with up to four ODUs per path. One ODU can have two DOUs in it. For
information on insertion/deletion ofthe DOU in the ODU, look at the main window of the BIU as
shown below
Figure 6.9 –DOU assignment at the BIU
When you select the ODU screen from the left TREE panel, you can see the DOU 1 or DOU 2 menu
actiavted depending on whether DOU has been inserted. Then, the optical port set at the INSTALL
menu is also actiavted to let you check PD value of the optical port. Any unused optical port is seen
de‐activated in grey.
Figure 6.10 –ODU Menu information
The level of DOU’s Laser didoe is typically +1.5±1dBm. DOUs have various alarm such as LD Power
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alarm, Overload Alarm and PD alarms.
The level of Laser diode received from ROU/OEU is +7dBm±0.5dB. The level of Photo diode will be
displayed with losses related to the length of optical cables and insertion loss of optical connectors.
In general, the level of optical PD POWER should be +6dBm to +2dBm±1.5dB.
Furthermore, the ODU has the function of automatically compensating for optical cable loss.
Initially, if BIU communicates with the lower Unit(OEU,ROU), the optical loss compensation is
automatically affected.
During optical compensation, the Result window shows "Processing" and then a result value. There
are three types of results as follows:
A.
Success: The optical compensation is normally completed
B.
Over Optic Loss: Generated optical loss is 5dBo or more.
C.
Communication Fail: Communication with ROU is in poor conditin.
The ATT for
optical compensation can work based on the numerical expression of 12‐2*(LD
POWER‐PD POWER). Optical compensation can be made not only in the ODU but also in the ROU.
6.2 ROU Overview
The figure below shows the SC‐DAS system link level (BIU‐ODU‐ROU). This section describes ROU‐
related information. The ROU receives various signals through optical modules. These signals are
filtered only for corresponding signal band from the MFR/ARF module and amplified with a High
Power Amplifier. Then, the multiplexer combines the signals with others and sends them to the
antenna port.
Figure 6.11 –SC‐DAS Link budget for ROU
6.2.1 ROU Operation
The ROU is a one‐body enclosure type and is located at a remote closet in the building. It
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can be installed on a wall or into a rack.
Basically, only one antenna port is provided. To install multiple antennas, you need dividers
and/or couplers. The ROU can work with a DC Feeder and an Optic Cable Feeder. To power
the ROU, a power supply of either AC‐DC or DC‐DC can be selected depending on the
application.
For upper level, the ROU can be connected with the ODU and OEU. It has an AGC function
for 5dBo of optical cable loss.
The following shows operational procedures after installation ofthe ROU.
Checking the status of ROU's LED Indicator
When power cable is plugged into an outlet, power is provided for the ROU. Check
information on each module's LED of the system. The table below shows normal/abnormal
cases depending on the status of each module's LED.
Description
LED
ON
Power is not supplied
Power is supplied.
Normal Operation
ALM
Abnormal Operation
R‐OPT is normal operation
OPT
R‐OPT is abnormal Operation
TXD
Flashing when data send to upper unit
RXD
Flashing when data receive from upper unit
Checking Communication LED of ROU
Check if TXD and RXD LEDs in the MRU make communication. Receiving FSK signals from the BIU,
the ROU sends requested status value to the BIU. During reception, RXD LED blinks. During
tramsmission, , TXD LED blinks. At this time, you need to see if whether to use a corresponding ROU
is checked on
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When theARU is connected with the MRU, check if TXD and RXD LEDs at ARU blink. At this time,
check whether external cable is connected to the MRU and ARU
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ROU Optic Comp Operation
The ROU has the function of automatically compensating for optical loss. It can do the work for up to
5dBo of optical loss. Set “TX OPTIC COMP” of the MRU to "ON." Optical compensation of ROU can
not be made without communication to the ODU or OEU. For 1dBo of optical loss, basic TX OPTIC
ATT is 1dB; for 5dBo of optical loss, TX OPTIC ATT is 4dB. OPTIC COMP works only one time before it
stays dormant.
The figure below shows a screen for OPTIC Information in ROU GUI.
LD POWER references the output level of ROU Laser Diode which is sent to a upper unit by the ROU.
PD POWER references the input level of Photo Diode to be received from a upper unit.
Figure 6.12 –Optical information at the ROU
Initially, When the ROU communicates with the upper device(ODU/OEU), optical loss compensation
is done automatically. During optical loss compensation, the result window shows "Processing" and
then a result valueis displayed. There are three types of results as follows:
1.
Success: The optical compensation is normally completed.
2.
Over Optic Loss: Generated optical loss is 5dBo or more.
3.
Communication Fail: Communication with ROU is in poor condition.
Continue if TX optic result is successful. If the results are “over optic Loss”, clean optical connector
face using clear cloth, and then operate TX OPTIC COMP again.
Also, you can perform optical loss compensation manually. Here, RUN Mode displays two types as
shown below
1.
Auto : CPU of MRU is performed automatically when is commnincated with upper device
2.
Manual : when user performs manually. This result willdisplay
If ROU does not make optical compensation, there will be erors in the system link budget . It
can cause lower output levels or make Spurious Emissions detrimental to the system.
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ROU Setting
The MRU can be interfaced with two RUs. One is an ARU which is provided with an extra carrier
band. The other is a VHF+UHF RU which is provided with public safety service required in the building
code.
Through the GUI at the MRU, it queries the status and control of the MRU, the ARU and the
VHF+UHF RU
Figure 6.13 –ROU information assignment
By clicking the main menu which is MRU,ARU and VHF+UHF, you can query and control these units
Set HPA of a corresponding RDU as “ON.” Use TX OUTPUT AGS function and set it as a desired
output level.
Figure 6.14 –ROU Menu information
The table below shows maximally allowable Composite Powerlevels that can be set per band:
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ROU Band
Power that can be
Setting range
Remark
maximally set
700LTE
24dBm
0 ~ 24dBm
ARU700LTE+AWS‐1
700LTE(MIMO)
28dBm
0 ~ 28dBm
MRU700LTE+AWS‐1
850Cellular
24dBm
0 ~ 24dBm
MRU 1900PCS+850C
28dBm
0 ~ 28dBm
MRU 1900PCS+850C
31dBm
0 ~ 31dBm
MRU 1900PCS
AWS‐1
28dBm
0 ~ 28dBm
ARU700LTE+AWS‐1
900I
26dBm
0 ~ 26dBm
ARU900I+800I
800I
26dBm
0 ~ 26dBm
ARU900I+800I
700PS
27dBm
0 ~ 27dBm
MRU700PS+800PS
800PS
27dBm
0 ~ 27dBm
MRU700PS+800PS
1900PCS
AGS function enables you to adjust output power as you like. While the AGS function is being
executed, the Result window shows "Processing" and then a result valueis displayed. There are three
types of results as follows:
A.
Success: The AGS function is normally completed.
B.
Not Opterate OPTIC Comp: Optic Comp is not executed.
C.
Lack of ATT: There is no attenuation available.
Set the upper/lower limits. The following table shows recommended limit settings:
Item
Recommended Limit
Remark
TX OUTPUT HIGH ALM
Max Composite Power+1dB
Alarm
TX OUTPUT LOW ALM
0dBm
Alarm
TX OUTPUT ALC
Max Composite Power
Auto Level control
TX OUTPUT SD
Max Composite Power+2dB
Shutdown
RX ALC
‐45dBm
If TX OUTPUT HIGH ALM is higher than a setting value, alarms will be generated.
If TX OUTPUT LOW ALM is lower than a setting value, alarms will be generated. TX OUTPUT HIGH
ALM/LOW ALM tends to work only as warning.
When you activate (“ON”) TX OUTPUT ALC, outputs will be restricted depending on a setting output
value.
When you activate (“ON”) TX OUTPUT SD, output will be turned OFF once output power level
reaches the same as SD setting value. Upon SD operation, check output level after 10 minutes and
then check the status again.
When you activate (“ON”) RX ALC, inputs will be restricted depending on a setting value.
As described above, when normal output level and alarm limit values are set, you need to check if
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the value of MODULE FAILURE LED Indicator is green.
For unused bands, you need to use band select‐ON/‐OFF function to turn them off.
The ROU has softkey function, when softkey is identified with serial number, the band can be
activated.
If the softkey do not identify with the serial number, you can not use that band. The softkey has a
unique value according to serial number. To use two bands simulatanously, you should enter softkey
value.
Figure 6.15 –ROU Softkey information
, The ROU has unique serial number and also a unique softkey.
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6.3
OEU Operation
The figure below shows the system link level of SC‐DAS (BIU‐ODU‐OEU‐ROU). This section describes
OEU‐related information. The OEU receives various signals through optical modules. The optical
signals are converted to RF signals and the RF signal are amplified to moderate signal levels. To
transmit to ROU, the signal is converted to an optical signal
Figure 6.16 –SC‐DAS Link Budget for OEU
6.3.1 OEU Operation
The OEU comes as a rack mount chassis and is located at a remote closet in a building.
The OEUs main function is to act as a hub for expansion to other buildings, It only requires
one strand of fiber to expand to 8 ROUs.( OEU supports up to 2 DOUs and the DOU
supports up to 4 optical ports that connect ROUs).
The ROU can work with a DC Feeder and an Optic Cable Feeder. of the
OEU requires a DC‐
DC power supply.
In the other direction, the OEU can be connected with a ODU. It has optical loss
compensation function for 5dBo of optical cable loss. The following shows operational
procedures after installation of the OEU.
Checking the status of OEU's LED Indicator
After turning on the switch of the power supply in the OEU, check information on each
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module's LED of the system. The table below shows normal/abnormal cases depending on
the status of each module's LED.
Unit
LED
Indicates
Green : Laser Diode normal status
LD
Red :Laser Diode abnormal status
EWDM
Green :
Photo Diode normal status
PD
Red : Photo Diode abnormal status, input optic power low alarm
Green : Laser Diode normal status
LD
Red :Laser Diode abnormal status
Green :
Photo Diode(PD) of optic port1 is normal
PD1
Red : PD of optic port1 is abnormal or input optic power low
Green :
DOU1,2
Photo Diode(PD) of optic port2 is normal
PD2
Red : PD of optic port2 is abnormal or input optic power low
Green :
Photo Diode(PD) of optic port3 is normal
PD3
Red : PD of optic port3 is abnormal or input optic power low
Green :
Photo Diode(PD) of optic port4 is normal
PD4
Red : PD of optic port4 is abnormal or input optic power low
ON
System
Green : Power on
TXD1
Green flicker : ECPU send NMS Tx data to BIU
RXD1
Green flicker : ECPU receive NMS Rx data from BIU
TXD2
Green flicker : ECPU send NMS Tx data to ROU
RXD2
Green flicker : ECPU receive NMS Rx data from ROU
Green : OEU system normal (no alarm)
ALM
Red :OEU system abnormal (alarm)
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Checking Communication LED of OEU
Step 1 : checking whether there is communication with the BIU(ODU)
Check if TXD1 and RXD2 LEDs in OEU front LED make communication. Receiving FSK signals from BIU,
the OEU sends requested status value to BIU. During reception, RXD1 LED flicks. During
tramsmissionTXD1 LED flicks.
Step 2 : Checking whether there is communication with the ROU
OEU configured as a Hub. OEU has two optical ports. One is connected to upper ODU and the others
is connected to ROU. Communication with ODU was checked at above step 1
Step 3 is checking whether the OEU communicates with the ROU. The OEU request status to the
ROU and then TXD2 blinks If respones data is received from ROU, RXD2 LED blinks
OEU Optic Comp Operation
The OEU has the function of automatically compensating for optical calbe loss. It can do the work for
up to 5dBo of optical loss. Set “TX OPTIC COMP” of OEU’s optic as "ON." Optical compensation of
the OEU can not be made without communication with the ODU. For 1dBo of optical loss, TX OPTIC
ATT is 1dB; for 5dBo of optical loss, TX OPTIC ATT is 4dB. OPTIC COMP works only one time before it
stays dormant.
The figure below shows a screen for OPTIC Information in the OEU GUI.
LD POWER references the output level of OEU Laser Diode, which is sent to a upper unit by the OEU.
PD POWER references the input level of Photo Diode to be received from a upper unit.
Figure 6.17 –OEU Optical information
Normal LD power level is typically +7dBm±1dBm, PD power is range of +1dBm to
‐5dBm. The results
value is same to the ROU’s optical loss compensation(see the ROU more detail)
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Like the ROU, the OEU performs optical loss compensation automatically when the OEU
communicates with upper ODU first.
During optical compensation, the Result window shows "Processing" and then a result value is
displayed. There are three types of results as follows:
1.
Success: The optical compensation is normally made.
2.
Over Optic Loss: Generated optical loss is 5dBo or more.
3.
Communication Fail: Communication with ROU is in poor conditin.
The OEU can be inserted with two DOUs. The DOU’s behavior is exactly same to the ODU(See the
ODU for more detail)
If OEU does not make optical compensation, there will be errors in the system link budget . It
can cause low output levels or make Spurious Emissions detrimental to the system.
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Section7
Additive functions
7.1
Shutdown function
7.2 Total power limit function
7.3 Automatic Output power setting function
7.4 Input power AGC function
7.5 Input power limit function
7.6 Optic loss compensation
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This chapter describes additive functions of SC‐DAS
7.1 Shutdown function (TX output shutdown)
The DAS has an automatic shutdown function to protect the DAS itself and the wireless
network when the normal operational conditions cannot be maintained
Shut down is triggered automatically when the composite power downlink output is above
the values defined as average for the device for a period not to exceed 5 seconds. Critical
levels are set through the GUI
After automatic shutdown, the system may automatically turn‐on in order to assess
whether the temporary condition has changed. If the condition is still detected, the DAS
shall shutdown again. This action will be repeated 5 times
After The 5th time, if the condition is still detected, the DAS will be shutdown permanently.
The following diagram shows the shutdown logic
5sec
Criterion value
Shutdown
5sec
5sec
5sec
5sec
5sec
5sec
5sec
5sec
permanently
Shutdown
Figure 7.1 –Shutdown logic diagram
After the retry logic exhausts itself, the DAS will shutdown permanently and illuminate the
fault via visual fault indicator
Permanent shutdowns of the DAS will also be reported to the NOC through the NMS
7.2 Total Power Limit function (TX Output ALC)
In order to protect the HPA and not to radiate spurious emissions, output power s is limited
to a defined value which is set by the operator in advance. To execute this function,
operator should turn‐on the ALC function and set limit level through the GUI. If the output
power exceeds the defined value, the output attenuator is adjusted to return it within
defined value. The output attenuator’s adjustment range is 25dB max. If output power
decreases, attenuation is decreased using the AGC function to return to the initial
attenuation level.
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7.3 Automatic Output power setting function (TX Output AGC)
To provide convenience of setting output power at initial setup automatically, set output to
desired level and turn‐on the AGC function. The output power is automatically set to
defined level.
After AGC logic is complete, logic operation results will show on the result window of the
GUI. There are three types of results as follows
1.
Success: The AGS function is normally completed.
2. Not Opterate OPTIC Comp: Optic Comp is not executed.
3. Lack of ATT: There is no attenuation available.
If normal logic can’t be
executed, changed ATT will return to initial ATT
Through the output AGC function, it can be verified whether optic compensation is
executed or not.
7.4 Input power AGC function (TX Input AGC)
This function is to help the operator with initial setting during installation.
Without a spectrum analyzer, we can see the input power value through power display
window of the GUI. Use the TX IN AGC function and automatically set the internal ATT
depending on the input level. The ATT is automatically set based on ‐20dBm input . The
table below shows TX IN ATT depending on TX IN POWER. For manual setting, you can set
ATT depending on input according to the table.
TX IN POWER
TX IN ATT
TX IN POWER
TX IN ATT
TX IN POWER
TX IN ATT
‐20dBm
0dB
‐9dBm
11dB
+1dBm
21dB
‐19dBm
1dB
‐8dBm
12dB
+2dBm
22dB
‐18dBm
2dB
‐7dBm
13dB
+3dBm
23dB
‐17dBm
3dB
‐6dBm
14dB
+4dBm
24dB
‐16dBm
4dB
‐5dBm
15dB
+5dBm
25dB
‐15dBm
5dB
‐4dBm
16dB
+6dBm
26dB
‐14dBm
6dB
‐3dBm
17dB
+7dBm
27dB
‐13dBm
7dB
‐2dBm
18dB
+8dBm
28dB
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‐12dBm
8dB
‐1dBm
19dB
+9dBm
29dB
‐11dBm
9dB
0dBm
20dB
+10dBm
30dB
‐10dBm
10dB
7.5 Input power limit function (TX Input ALC)
The DAS has a TX input ALC function at the BIU to limit level when input power is increased
above level by operated input AGC function
Normally, there are no more than two input ports in the MDBU of the BIU
For example, the 850 cellular band has two input ports to support both VzW and AT&T
These two input powers may be different from each other. The DAS has an input attenuator
in first stage of the MDBU. Through input AGC function, the input ATT is adjusted according
to the input power. If input power increases, the input ATT is adjusted again to limit
increased input powerand if the input power decreases, the input ATT will return to the
initial ATT setting.
7.6 Optical loss compensation
The DAS has the function of automatically compensating for optical loss. It can do the work
for up to 5dBo of optical loss. Set “TX OPTIC COMP” of ROU as "ON." Optical compensation
of ROU can not be made without communication to the ODU or OEU. For 1dBo of optical
loss, basic TX OPTIC ATT is 1dB; for 5dBo of optical loss, TX OPTIC ATT is 4dB. OPTIC COMP
works only one time before it stays dormant.
The figure below shows a screen for OPTIC Information in the ROU GUI.
LD POWER references the output level of ROU Laser Diode, which is sent to a upper unit by
ROU. PD POWER references the input level of Photo Diode to be received from a upper unit.
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Figure 7.2 –Optical loss information
During optical compensation, the Result window shows "Processing" and then a result
value is displayed. There are three types of results as follows:
1.
Success: The optical compensation is normally competed
2. Over Optic Loss: Generated optical loss exceed 5dBo or more.
3. Communication Fail: Communication with ROU is under poor condition.
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