Comba Comflex NG Analog DAS Solution User Manual
- June 10, 2024
- Comba
Table of Contents
Comba Comflex NG Analog DAS Solution
System Introduction
Introduction
Comba Analog DAS Solution is an industrial-leading in-building distributed
antenna solution for enterprise and consumer applications, supporting the wide
application range of cellular generations: 4G and 5G. This solution is based
on analog DAS technology with wide-band and multi-band distribution
architecture, and flexible off-air or wired connection mode, enabling
efficient utilization of signal links. It is designed to support multi-band,
multi-technology, and multi-operator networks with flexible configuration and
easy commissioning.
System Architecture
MU – Master Unit
Select dedicated radio signal, transmit to fiber signal, and then transfer it
to the fiber Hub. It can support two kinds of connectivity to radio signals:
off-air connection and wired connection with a different modules.
Fiber Hub
The Fiber Hub is the central Hub and Distribution element for the analog DAS
system. The fiber hub interfaces between the MU and the active antenna unit,
allowing it to receive the operator’s service signals in the optical link, and
to route signals to the active antenna unit.
Active Antenna Unit
The active antenna unit is a low-power remote antenna unit with 19~22 dBm per
MIMO stream per band
System Function
System features
-
Supports up to 6T6R, 4G and 5G signals
-
Output power
2.5GHz/3.5GHz: 22dBm
700MHz/850MHz/1900MHz/EAWS: 19dBm -
Network topology
- MU + Fiber HUB + ARU: 1+16+256
- MU can connect to ONE slave MU
- MU can extend up to 16pcs fiber Hub
- Fiber HUB can connect to 16pcs ARU
- MU-HUB max fiber loss 8dBo；
- HUB-ARU max fiber loss distance 45dB
-
Power Supply
MU & HUB: AC 110V
ARU: DC 48V -
Couple way Off-air couple : MU – BDA Card Wired couple: MU – POI card
Monitoring
- Local monitor: local debug and commission
- Remote control: Control the system in MU site
- System upgrade：Software upgrade in MU
- 4G/5G demodulation: Demodulate the cellular features: RSRP, SINR, PLMN
Specification
Optical Specification
Optical Specification
Operation Frequency| | 600MHz-1GHz,1.7GHz-2.2GHz, 3.3GHz-4GHz
Fiber Mode| /| Simplex
Wavelength| nm| 1310, 1550 + WDM
Optical Output| MU| dBm| -2 – +2
HUB| 6-8
Return loss| dB| > 45
Connector Type| /| SC/APC
Cable Specification
Cable Specification
Operation Frequency| | DC-4GHZ
impedance|
Ω| 50
VSWR| /| ≤1.2
Insert Loss| dB| ≤（L*0.48+0.2）dB@DC-4GHz @ meter
Radio Specification
Radio Specification
| 700MHz| 850MHz| 1900MHz| EAWS| 2.5G band| C band
Frequency
| UL| ****
MHz
| 698-716 /
777-787
| 824-849| 1850 – 1915| 1710 – 1755| ****
2496-2690
| ****
3700-3980
DL| 728-746 /
746-756
| 869-894| 1930 – 1995| 2110 – 2180
IBW| MHz| 18/10| 25| 65| 45/70| 194| 280
Carrier number (off-
air card)
| | | | | | 1| 1
Carrier IBW(off-air
card）
| MHz| | | | | 194| 200
Uplink Output Power
(PRRU)
| dBm| +10——+20dBm input POI card:-40
+20——+37dBm input POI card: -50
Uplink Output Power
(BDA Card)
| dBm| 19| 19| 19| 19| 22| /
Downlink max output
power (ARU)
| dBm| 19| 19| 19| 19| 22| 22
Downlink input range
(BDA Card)
| dBm| -95 —— -50(RSRP)| -100—— -55(RSRP)
Downlink input range (PRRU Card)| ****
/
| +10——+20dBm(RSSI) input
+20——+37dBm(RSSI) input
| +10——+20dBm(RSSI) input
+20——+37dBm(RSSI) input
UL max gain (BDA
Card)
| dB| 80| 80| /
---|---|---|---|---
DL max gain (BDA
Card)
| dB| 80| 80| 80
UL max gain (PRRU
Card)
| dB| +10——+20dBm input: 10
+20——+37dBm input: 0
DL max gain (PRRU
Card)
| dB| +10——+20dBm input: 10
+20——+37dBm input: 0
ATT adjust range| dB| MU: 0 – 30, ARU: 0 – 20
In-band ripple(P-P)| dB| ≤ 4| ≤ 6| ≤ 6| ≤ 6| ≤ 6| ≤ 6
Emission spur| | FCC| FCC| FCC| FCC| FCC| FCC
UL NF at max gain| dB| ≤ 10
System delay (BDA
Card)
| usec| ≤ 10
System delay
(PRRU Card)
| usec| ≤ 3
Input VSWR| | ≤ 1.5
MU Max input power
(BDA Card)
| dBm| -10
MU Max input power
(PRRU Card)
| dBm| 37
ARU Max input RF
power
| dBm| -10
INSTALLATION
WARNINGS AND ALERTS
Laser
Laser light can cause damage to the eyes. Laser light is not visible. Viewing
it directly does not cause pain. The iris of the eye will not close when
viewing a bright light. Consequently, serious damage to the retina of the eye
is possible. NEVER LOOK INTO THE END OF A FIBER THAT MAY HAVE A LASER COUPLED
TO IT.
Radio Frequency Energies
There may be situations, particularly for workplace environments near high-
powered RF sources, where recommended limits for safe exposure of human beings
to RF energy could be exceeded. In such cases, restrictive measures or actions
may be necessary to ensure the safe use of RF energy.
High Voltage
The equipment has been designed and constructed to prevent practicable
danger, as far as reasonably possible. Any work activity on or near equipment
involving installation, operation, or maintenance must be free from danger, as
far as reasonably possible.
Where there is a risk of damage to electrical systems involving adverse
weather, extreme temperatures, wet, corrosive, or dirty conditions, and
flammable or explosive atmospheres, the system must be suitably installed to
prevent danger.
Protective Earthing
Equipment provided for the purpose of protecting individuals from electrical
risk must be suitable for the purpose and properly maintained and used.
Handling Precautions
This covers a range of activities including lifting, lowering, pushing,
pulling, carrying, moving, holding, or restraining an object or person. It
also covers activities that require the use of force or effort, such as
pulling a lever, or operating power tools.
Electrostatic Discharge (ESD)
Observe standard precautions for handling ESD-sensitive devices. Assume that
all solid-state electronic devices are ESD-sensitive. Ensure the use of a
grounded wrist strap or equivalent while working with ESD-sensitive devices.
Transport, store, and handle ESD-sensitive devices in static-safe
environments.
WARNING
This is NOT a CONSUMER device. It is designed for installation by FCC
LICENSEES and QUALIFIED INSTALLERS. You MUST have an FCC LICENSE or express
consent of an FCC License to operate this device. Unauthorized use may result
in significant forfeiture penalties, including penalties in excess of $100,000
for each continuing violation. The device does not support home/personal use.
Caution: for use of unauthorized antennas, cables, and/or coupling devices not
conforming with ERP/EIRP restrictions is not permitted. Antenna gain for
remote unit Model number: ARU-6B-Internal
- Antenna Type: Internal Antenna
- Antenna Gain: Lower 700MHz: 4dBi
- Upper 700MHz: 4dBi
- Cellular: 4dBi
- EAWS: 4dBi Broadband
- PCS: 4dBi
- BRS/EBS: 5dBi 3.7GHz
- Service: 3dBi
- Antenna gain for MU unit Model number: Comflex NG MU
- Antenna Type: External Dedicated Antenna
- Permission Antenna Gain: 14dBi or less
This device is an industrial-leading in-building distributed antenna solution and is restricted to indoor use only. This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with a minimum distance of 24cm between the radiator and your body. This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter. The installation height of the antenna for AWS 1710-1755MHz band operation is limited to 10 meters above ground for compliance with section 27.50.
SITE PLANNING CONSIDERATIONS
SITE PLANNING
Site Considerations
The MU is designed to be located indoors to facilitate the coupling of BTS
signals and power supply connections. The input range of the MU RF unit is
10~30 dBm.
The site consideration for HUB is listed below:
- The maximum fiber maximum path loss of 8dBo.
- The system delay of the optical system must be taken into consideration when there are neighboring BTS sites overlapping in coverage.
Installation Location
The mounting surface shall be capable of supporting the weight of the
equipment.
In order to avoid electromagnetic interference, a proper mounting location
must be selected to minimize interference from electromagnetic sources such as
large electrical equipment.
Environmental
Humidity has an adverse effect on the reliability of the equipment. It is
recommended to install the equipment in locations having stable temperatures
and unrestricted airflow.
The installation location for the system should be well-ventilated. The
equipment has been designed to operate at the temperature range and humidity
level as stated in the product specifications.
Grounding Requirement
Verify that the equipment has been well grounded. This includes antennas and
all cables connected to the system. Ensure lightning protection for the
antennas is properly grounded.
Cable Routing
Depending on equipment configuration, a variety of types of cables are
connected to the MU HUB and RU: coaxial cables, optical fibers, power cables,
communication cables, and commissioning cables. Where applicable, ensure
cables are properly routed and secured so that they are not damaged.
Manual Handling
During transportation and installation, take necessary handling precautions to
avoid potential physical injury to the installation personnel and the
equipment.
SYSTEM INSTALLATION CHECKLIST
- Working space available for installation and maintenance for each mounting arrangement. Ensure unrestricted airflow.
- Ensure earthing point is within reach of the ground wire. (2m; 6 ft. 10 in.).
- Ensure a power source is within reach of the power cord and the power source has sufficient capacity.
- Where appropriate, ensure unused RF connectors are terminated.
- Where appropriate, ensure unused optical fiber connectors are protected.
- Do not locate the equipment near large transformers or motors that may cause electromagnetic interference.
- Reduce signal loss in feeder cable by minimizing the length and number of RF connections.
- Ensure the equipment will be operated within the stated environment (refer to datasheet).
- Where needed, a couple of BTS RF signal with a coupler to prevent damaging the equipment.
- Where appropriate, confirm available of the suitably terminated grade of RF and optical fiber.
- Observe the handling of all cables to prevent damage.
INSTALLATION PROCEDURES
GOODS INWARDS INSPECTION
ComFlex was factory tested, inspected, packed, and delivered to the carrier
with utmost care. Do not accept shipment from the carrier which shows damage
or shortage until the carrier’s agent endorses a statement of the irregularity
on the face of the carrier’s receipt. Without documentary evidence, a claim
cannot be processed. Open and check each package against the packing list. For
any shortage, contact Comba Telecom Systems. Do not remove items from packing
materials until installation.
TOOLS
See for a full list of tools required for installation and maintenance
.
PREPARATION **
**
Optical Fiber:
- Fiber optic cables require proper handling. Do not stretch, puncture, or crush the fiber cable(s) with staples, heavy equipment, doors, etc.
- Always maintain the minimum bending radius specified by the cable manufacturer. The minimum bend radius is usually 10 times the cable’s outer diameter. In the case of single optical fiber that is not in a cable, the minimum bending radius to be observed is 3cm. (1.2”) .
MU install
MU consists of three parts: MU chassis, RFU, and FOU. All components are
individually packaged. Install the MU chassis on the rack first, then insert
the RFU module and FOU module into the MU chassis
MU unit ****
MU chassis mounted in a 19-inch rack
The MU chassis is a 19-inch rack-mounted device with a height of 6U, which can
be installed into a 19-inch rack as follows:
Step 1: Determine the installation position of the MU chassis on the
rack, install cabinet nuts on the corresponding holes on both sides of the
rack as shown in Figure 3, and install cabinet screws on the 1U cabinet nuts
on both sides. The cabinet screws are only screwed in half the length.
Install cabinet nuts and support screws ****
Step 2: Place the MU chassis inside the rack, with the notches at the
bottom of the hanging ears on both sides slightly higher than the cabinet
screws. Then slide the MU chassis down to make the cabinet screws snap into
the notches.
Install cabinet nuts and support screws
Step 3: Install the remaining 6 cabinet screws on both sides of the MU
chassis, tighten the 8 screws (including the pre-installed 2 cabinet screws),
and complete the installation of the MU chassis.
Install cabinet nuts and support screws
RFU and FOU installation
Step1: RFU module installation: Remove the baffle of the RFU slot in the
MU chassis, insert the RFU module, and tighten the fastening screws on the
module (10 RFU modules can be inserted into any of 8 RFU slots)
RF Unit Installation
Step2: FOU module installation: Remove the FOU slot baffle from the MU
chassis, insert the FOU module, and tighten the fastening screws (FOU module
can be inserted into any of the 2 FOU slots)
FOU Installation
HUB Wall mounted installation
Install HUB onto the wall as follows
Step 1: Choose the appropriate wall position: The wall can safely bear
the weight of HUB Capable of comfortable wiring at the top and bottom of the
HUB
Step 2: Drill installation holes and fix the installation bracket Use a mounting bracket as a template to mark the positions of four installation holes on the wall. Use a Ø 10 impact drill bit to drill installation holes for M8 expansion bolts, with a depth of no less than 50mm. Install the expansion bolts into the wall, and then fix the installation bracket to the wall through the expansion bolts Figure 8: Punch installation holes and fix the installation bracket
Step 3: Hang HUB
Hang the HUB on the fixed mounting bracket
Hang HUB
Step 3: Fix HUB and complete installation At the middle of the bottom of
the HUB, use an M6X16 screw to secure the HUB chassis and mounting bracket
together to complete the installation.
Tighten the chassis screws ARUinstall
Hanger installation
In the scenario where ARU is fixed with a suspension rod, complete the
installation as follows.
Step 1: Fix hanger 1 on the suspension rod. Use nuts and washers to fix
Hanger 1 to the already set suspension rod on site (nuts and washers need to
be provided by oneself, supporting M8 to M12 suspension rods)
Hanger 1 mounted on the boom Step 2: Mount Hanger 1 on the boom and secure
Hanger 2 to the ARU. Use M4X10 screws to secure mounting bracket 2 to the ARU.
ARU mounting rack 2 Step 3: Hang the ARU, tighten the screws, and complete
the installation. Hang the ARU on rack 1, tighten the fastening screws on rack
1, and complete the installation.
ARU mounting rack 2 Installation of wooden beams
Step 1: Fix hanger 1 on the wooden beam. Use four ST6.3X30 wood screws to
secure the hanging bracket 1 to the wooden beam.
Step 2: Secure rack 2 to the ARU.
Use M4X10 screws to secure mounting bracket 2 to the ARU.
ARU MOUNTING RACK 2
Step 3: Hang the ARU, tighten the screws, and complete the installation.
Hang the ARU on rack 1, tighten the fastening screws on rack 1, and complete
the installation.
ARU MOUNTING RACK 2
Wall mounted installation
Step 1: Fix hanger 1 on the wall.
Use hanging bracket 1 as a template to mark the drilling position on the wall,
and use a Ø 8 impact drill bit to drill the installation hole for M6 expansion
bolt, with a drilling depth of no less than 40mm.
Install the expansion bolts into the wall, and then fix the installation
bracket to the wall through the expansion bolts
Hanger 1 fixed to the wall
Step 2: Secure rack 2 to the ARU. Use M4X10 screws to secure mounting
bracket 2 to the ARU.
ARU MOUNTING RACK 2
Step 3: Hang the ARU, tighten the screws, and complete the installation.
Hang the ARU on rack 1, tighten the fastening screws on rack 1, and complete
the installation.
ARU hanging into rack 2
Installation of ceiling gantry
Step 1: Fix the screw onto the mounting bracket 2. Fix the screw onto the
mounting bracket 2 using M6 nuts and washers.
Install bracket 2 onto the screw Step 2: Secure rack 2 to the ARU. Use
M4X10 screws to secure mounting bracket 2 to the ARU.
Installation rack 2 installed on ARU Step 3: Fix the ARU on the gantry.
Use M6 ordinary nuts and butterfly nuts to fix the ARU on the gantry through
screws and adjust the appropriate height.
Installation rack 2 installed on ARU Step 4: Place the gantry on the
ceiling and complete the installation. Adjust the width of the gantry to the
appropriate position, and then place the entire structure on the ceiling to
complete the installation.
Place the gantry on the ceiling Ceiling mounted installation
Step 1: Ceiling openings. Use a hole template to create a square hole in
the ceiling.
Opening square holes in the ceiling Step 2: Loosen the corner part screws.
Remove the four plugs from the top cover and loosen the screws that secure the
corner pieces. The spacing between the corner pieces to be loosened is
determined by the thickness of the ceiling.
Loosen the screws of the corner piece Step 3: Place the ARU in the
ceiling. Place the ARU into the square hole in the ceiling that has been
opened, and use a screwdriver to rotate the fixing screw of the corner piece.
The fixing screw will drive the corner piece to rotate and clamp onto the
ceiling.
Loosen the screws of the corner piece Corner pieces are clamped to the ceiling
Step 4: Tighten the screws to complete the installation. Tighten the
fixing screws and reinstall the plugs for the four holes to complete the
installation.
Complete installation Equipment power supply
MU and HUB require 110V AC power supply, and the preferred power supply method
is to use the power line cut off method. This power supply method requires
single-phase electricity (110V AC) to be extracted from the three-phase
electricity in the distribution cabinet If there is no power cord cutting
method available on site, use a socket to take 110V AC power. The power socket
must be at a height that is not easily accessible by ordinary people to
prevent manual unplugging of the base station power plug.
Equipment grounding
- Use the resistance range of a multimeter, with one probe connected to the device’s casing screw and one probe connected to the ground wire of the power socket. If the measured resistance value is relatively small (less than 10 Ω), it is considered that the device has good grounding performance. If the resistance value is too large, it can be investigated from the following aspects：
- Eliminate the problem with the multimeter itself: short circuit the two probes of the multimeter and observe if the resistance value is zero; The resistance value is zero, and the multimeter is normal; Not zero, abnormal multimeter.
- Is the screw for equipment grounding tightened.
- Is the grounding wire broken.
- Touch the device casing with an electric pen. If the electric pen light is on, it indicates that there is current in the equipment casing and there is a leakage situation. Need to check if the equipment grounding is standard.
Cable connection
The fiber length insertion loss between MU and HUB shall not exceed 8dBo, and
the 5D cable insertion loss between HUB and the farthest ARU shall not exceed
45dB. After the installation of MU, HUB, and ARU is completed, the
installation interface needs to be connected and checked for accuracy before
turning on the power and working normally.
Device identification
Each device, as well as wall mounted boxes and meter boxes, should be labeled
clearly for future management and maintenance. The labels should be pasted in
a visible area on the front of the equipment and equipment. The labels for
each cable (such as 5D cable, power cord, tail fiber, etc.) are affixed at
20mm away from the wire head at both ends for easy reading and future
management and maintenance. The labeling should be neat and clear. The label
of the device should be prominently placed on the device and not affect the
overall harmony of the environment to maintain overall aesthetics. Warning
signs must be attached to the host and power supply. When there are multiple
devices or lines running side by side, the labels must be placed on the same
horizontal line
Power on inspection
After powering on, it is possible to observe whether the power supply, optical
fiber, etc. are connected properly, and whether the optical fiber and 5D cable
are normal can be confirmed through the device indicator light.
Routine inspection
Equipment installation: Check whether the installation position of the
equipment matches the design, and whether the installation is firm; Power
supply installation: Check whether the power supply is normal and whether the
installation process of the power cord is qualified; Site labels: Check if the
equipment, power supply, and other labels are complete and labeled in a
standardized manner; Cable continuity: Use an optometry pen to test whether
the physical link of the tail fiber is normal; Equipment grounding integrity:
Use a multimeter to test the resistance of the grounding wire to ground, etc.
Other: After powering on, check if the relevant indicator lights are on, etc
References
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