Item 1. RF Port 2. ANT Port 3.
Section5 System Installation & Operation 5.1 BIU Installation 5.2 ODU Installation 5.3 ROU Installation 5.
This chapter describes how to install each unit and corresponding fiber cables, along with power cabling method. In detail, the chapter describes how to install shelves or enclosures of each unit, Power Cabling method , Optic Cabling and RF Interface. Furthermore, by showing power consumption of modules installed in each unit, a the Power Cabling budget is easily determined. Last, it describes the quantity of components of modules to be installed in each unit along with an expansion method. 5.
MCPU to query and control state of each module and a Power Cable to supply power from external rectifiers. In addition, ther are slots for the MDBUs which provide services for desired band (Optional) and the MCDU to combine and divide TX/RX signals for each SISO and MIMO slots 5.1.2 BIU Power Cabling BIU requires ‐48VDC input power. Connect DC cable from the power supply to the Terminal Block seen at the rear of BIU.
of BIU to check the power. Power Switch LED Description Abnormal, Not supply Power ‐48Vdc ON Normal supply power ‐48Vdc O Normal Status DC ALM Failure of output Power ON I Normal Status DC ALM Figure 5.
5.1.3 BIU/RF interface The BIU can be connected with a Bi‐Directional Amplifier or Base Station Tranceiver. To connect the BIU with a BDA, you need to use a duplexer or a circulator to separate TX/RX signals from each other. The BIU can feed external TX/RX signals from the Back Plane. Using a dual band MDBU, the BIU can easily accomodate all frequency bands. As seen in the table below, the MDBU is divided into Single and Dual Bandmodules and each unit can be connected with two carrier signals per band.
MDBU 700PS:2Port Port#2 700PS TX(763~775MHz) 700PS RX(793~805MHz) 800PS:2Port Port#3 800PS TX(851~869MHz) 800PS RX(806~869MHz) Port#4 800PS TX(851~869MHz) 800PS RX(806~869MHz) 900I Single Band Port#1 900I TX(929~941MHz) 900I RX(896~902MHz) MDBU 900I:2Port Port#2 900I TX(929~941MHz) 900I RX(896~902MHz) VHF VHF Tx(136~174MHz) Rx(136~174MHz) UHF UHF Tx(380~512MHz) Rx(380~512MHz) 7 VHF+UHF Dual Band 8 Port#1 MCDU VHF+UHF : 1Port At the rear of BIU, Tx input and Rx output port
ports. Figure 5.5 – BTS /BIU connections Using a spectrum analyzer or power meter, you need to check signals sent from BTS TX. If the signals exceed input range (‐20dBm~+10dBm), you can connect an attenuator between the BTS and BIU to bring the signal level into range. BIU interface with Bi‐Directional Amplifier Since the BIU is Simplex format; you need to un‐duplex the BDA signal to properly connect it to the BIU.
Figure 5.7 –BDA Interface using Duplexer The BIU will work with the BDA in either of the methods above. TX signal level from the BDA must be verified that it is within range of the BIU. Given the BIU TX input range (‐20dBm~+10dBm/Total per port), verify it is within the input range, before connecting the ports. 5.1.4 MDBU installation MDBU is designed to be inserted into any slot. A BIU can be equipped with a total of four MDBUs.
LED Description Power is not supplied. ON Power is supplied. Normal Operation ALM Abnormal Operation Figure 5.8 –MDBU LED indicator information MONITOR SMA port seen at the front panel of the MDBU allows you to check the current level of TX input and RX output signals in service without affecting main signals. TX MON is ‐20dB below TX Input power and RX MON is ‐20dB below RX Output power as well. 5.1.5 ODU Interface The BIU supports up to four ODUs per platform.
Figure 5.9 –Interface port between BIU and ODU At the rear part of the ODU, the number of RF Ports and Signal Ports are printed in order. Its a good idea to label these in case additional ODUs are needed.
Figure 5.10 –Cabling interface diagram between BIU and ODU For unused RF Ports for ODU expansion, make sure to terminate them using SMA Term. When installing an ODU above the BIU, it is recommended to leave at least 1RU of space between the two. Heat from BIU rises and could damage the ODU. 5.1.6 BIU power consumption The table below shows power consumption of the BIU: Part Unit Consumption Power Remark Shelf Common Part MCPU 4.8 W MPSU MCDU ‐ 2.
700LTE+AWS‐1 16W 1900P 12W 900I+800I 16W 1900P+AWS‐1 ‐ 700PS+800PS On the loadmap ‐ 900I ‐ The BIU supplies power for ODU. When you want to calculate total power consumption of the BIU, you need to add power consumption of the ODU to the total value. Power consumption of ODU is given in the later paragraph describing ODU. 5.2 ODU Installation ODU should be, in any case, put on the top of BIU. This unit gets required power and RF signals from BIU.
optical port can be connected with an ROU. Optionally, only optical port 4 can be connected with OEU for ODU1 and ODU2. ODU3. ODU4 can not connect with OEU. As WDM is used in the DOU, the unit can concurrently send and receive two different wavelengths (TX:1310nm, RX:1550nm) through one strand of fiber. The DOU has SC/APC fiber connectors. Figure 5.11 –SC/APC fiber termination For optical adaptor, SC/APC type should be used.
When you insert DOU into ODU, insert the unit into the left DOU1 slot first. Insert a BLANK UNIT in the unused slot. 5.2.5 ODU Power consumption The ODU gets power from the BIU. One ODU can be equipped with up to two DOUs. Depending on how many DOUs are installed, power consumption varies.
5.3 5.3.1 ROU Installation ROU Enclosure installation The ROU enclosure has two options. One meets NEMA4 standard and the other is not waterproof or dirtproof. The ROU can be mounted on a Wall easily. Rack mounting is also possibleusing special frame. There are 3 different types and they will be explained later in this chapter. The ROU consists of anMRU and anARU. Their dimensions are thesame. The following shows the dimension of the mounting holes for the Wall Mount Bracket. Figure 5.
Screw the M6 Wrench Bolts by half at each side of the Heatsink enclosure. Figure 5.14 – ROU installation procedure side by side Place the enclosure with the M6 Bolt on the mounting groove and mount the M6 Wrench Bolts into the remaining mounting holes. In this case, you will use 4 M6 Wrench Bolts.
Figure 5.15 – ROU installation diagram side by side For connecting cables between MRU and ARU easily, the MRU should install on left side of ARU. Type2 : stacked installation If space prohibits the MRU and ARU from being mounted side by side, the units can be installed in a stacked configuration. Stacking the unit requires a special baracket for stacked installation First, install the MRU on the wall , then install the bracket for stacked installation on the MRU. Finally install the ARU on the bracket.
The following shows dimension of the mounting point for the stacked bracket. Figure 5.
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.
Figure 5.19 – ROU installation diagram for vertical rack Type2 : Horizontal installation on the rack For Horizontal installation, horizontal bracket is needed.
Figure 5.20 – ROU installation procedure for horizontal rack The following shows dimensions of the mounting point for horizontal installation Figure 5.
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 5.3.
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.
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 - 5.3.5 - The ground lug is designed meeting the SQ5.5 standard Coaxial cable and Antenna Connection The coaxial cables which are connected to DAS connect to antenna port of the ROU.
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.
900I+800I 5.3.8 44W Dual Band 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 ① ② ② ③ ③ ⑤ ⑤ ④ ④ (a)MRU1900P+850C/ARU700LTE/AWS‐1 (b)MRU1900P/ARU900I/800I Figure 5.
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. Unit Common Part Optional Part 5.4.
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.
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.
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.
Section6 Operation 6.1 BIU Operation 6.2 ROU Operation 6.
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.
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.
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.
. Make sure to turn OFF unused ports. The table below shows output power vs number of ports MDBU Band Output level (Composite power) No.
‐11dBm 9dB ‐10dBm 10dB 0dBm 20dB +10dBm 30dB 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).
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.
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.
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.
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.
The level of DOU’s Laser didoe is typically +1.5±1dBm. DOUs have various alarm such as LD Power 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.
6.2.1 ROU Operation The ROU is a one‐body enclosure type and is located at a remote closet in the building. It 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.
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 When theARU is connected with the MRU, check if TXD and RXD LEDs at ARU blink.
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.
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.
The table below shows maximally allowable Composite Powerlevels that can be set per band: 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 1900PCS AGS function enables
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.
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.
After turning on the switch of the power supply in the OEU, 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.
Red :OEU system abnormal (alarm) 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.
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) 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.
Confidential & Proprietary 110/115 SC‐DAS
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.
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.
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.
‐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.
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.
