Comba Telecom COMFLEX 6800 User Manual
ComFlex-6800
DISTRIBUTED ANTENNA
SYSTEM
USER MANUAL
ComFlex-6800 QE: 1-0-0
Comba Telecom Inc.
The information contained herein is the responsibility of and is approved by the
following, to whom all enquiries should be directed in the first instance:
This is an unpublished work the copyright in which vests in Comba International
("Comba"). All rights reserved.
The information contained herein is confidential and the property of Comba and
is supplied without liability for errors or omissions. No part may be reproduced,
disclosed or used except as authorised by contract or other written permission.
The copyright and the foregoing restriction on reproduction and use extend to all
media in which the information may be embodied.
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Section
Page
0.1 CONTENTS
0.1 CONTENTS ................................................................................................................................................ 3
0.2 INDEX TO FIGURES AND TABLES ................................................................................................................. 4
0.3 HISTORY ................................................................................................................................................... 6
0.4 GLOSSARY OF TERMS ................................................................................................................................ 7
0.5 SAFETY NOTICES AND ADMONISHMENTS .................................................................................................. 8
1 GENERAL INFORMATION ............................................................................................................................ 10
2 EQUIPMENT DESCRIPTION .......................................................................................................................... 12
2.1 SYSTEM DIAGRAM .................................................................................................................................. 12
2.2 TYPICAL APPLICATION ............................................................................................................................. 12
2.3 EQUIPMENT CONSTITUTION ................................................................................................................... 13
2.4 KIT OF PART ............................................................................................................................................ 14
3 INSTALLATION ............................................................................................................................................ 16
3.1 WARNINGS AND ALERTS ......................................................................................................................... 16
3.2 SITE PLANNING CONSIDERATIONS ........................................................................................................... 17
3.3 INSTALLATION PROCEDURES ................................................................................................................... 18
3.4 EQUIPMENT CONNECTORS ..................................................................................................................... 28
3.5 EQUIPMENT CONNECTION ....................................................................................................................... 32
4 COMMISSIONING ....................................................................................................................................... 37
4.1 PRE-COMMISSIONING TASKS .................................................................................................................. 37
4.2 LED INDICATORS ..................................................................................................................................... 37
4.3 DIGITAL DISPLAY INDICATORS ................................................................................................................. 38
4.3.1 DIGITAL DISPLAY ON RFU .................................................................................................................... 38
4.3.2 DIGITAL DISPLAY ON FOU.................................................................................................................... 38
5 WEB GUI ..................................................................................................................................................... 40
5.1 WEB GUI CONNECTION ............................................................................................................................... 40
5.2 WEB GUI INTRODUCTION ........................................................................................................................... 41
5.2.1 [DEVICES] ............................................................................................................................................... 42
5.2.2 [FUNCTION]............................................................................................................................................ 47
5.2.3 [AUTO SETUP] ........................................................................................................................................ 47
5.1.1 [FUNCTION] .................................................................................................................................... 48
5.3 COMMISSIONING PROCEDURE ................................................................................................................... 57
6 ALARMS AND TROUBLESHOOTING ............................................................................................................. 64
6.1 ALARMS ...................................................................................................................................................... 64
6.2 TROUBLESHOOTING ................................................................................................................................... 65
7 APPENDICES ............................................................................................................................................... 66
7.1 APPENDIX A: TOOLS FOR INSTALLATION AND MAINTENANCE .................................................................... 66
7.2 APPENDIX B: RMA (RETURN MATERIAL AUTHORIZATION) ......................................................................... 67
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0.2 INDEX TO FIGURES AND TABLES
Figure 1: Master Unit (MU) ............................................................................................................................... 10
Figure 2: Remote Unit (RU) .............................................................................................................................. 11
Figure 3: System Diagram ................................................................................................................................ 12
Figure 4: Typical Application ............................................................................................................................. 12
Figure 5: ComFlex Master Unit ......................................................................................................................... 19
Figure 6: RF Unit Installation ............................................................................................................................ 19
Figure 7: FOU Installation ................................................................................................................................. 20
Figure 8: PSU Installation ................................................................................................................................. 20
Figure 9: Mounting Rack ................................................................................................................................... 21
Figure 10: Angle Iron Installation ...................................................................................................................... 21
Figure 11: MU Installation ................................................................................................................................. 22
Figure 12: Secure the Enclosure ...................................................................................................................... 22
Figure 13: Finish Installaiton ............................................................................................................................. 23
Figure 14: Wall Drilling Dimensions of LRU..................................................................................................... 24
Figure 15: Wall Drilling Dimensions of MRU ................................................................................................... 24
Figure 16: Install Mounting Rack on the Wall ................................................................................................. 25
Figure 17: Hang RU onto the Mounting Rack.................................................................................................. 25
Figure 18: Tighten the Screws at the Bottom of RU ....................................................................................... 26
Figure 19: Tighten Two Hexagon Screws ........................................................................................................ 26
Figure 20: Install PSU on RU ............................................................................................................................ 27
Figure 21: Wall Drilling Dimensions of PSU .................................................................................................... 27
Figure 22: Install PSU on the Wall ................................................................................................................... 28
Figure 23: MU Front Panel Connectors ........................................................................................................... 28
Figure 24: MU Rear Panel Connectors ............................................................................................................ 29
Figure 25: 4.3-10 Female Dimension ............................................................................................................... 30
Figure 26: RU Connectors ................................................................................................................................ 31
Figure 27: MU Grounding (MU Rear Panel) .................................................................................................... 32
Figure 28: RU Grounding .................................................................................................................................. 33
Figure 29: Fiber Optical and RF Port Connection ........................................................................................... 34
Figure 30: MU Power Connection (Rear Panel) .............................................................................................. 34
Figure 31: RU Fiber Optical and RF Port Connection ................................................................................... 35
Figure 32: PSU Power Port Connection .......................................................................................................... 35
Figure 33: Pins Allocation for “EXT_ALM” Port for RU .................................................................................. 36
Figure 34: Pins Allocation for “BTS_ALM” Port ............................................................................................... 36
Figure 35: RFU Digital Display ......................................................................................................................... 38
Figure 36: Optical Port No. and Digital Display ............................................................................................... 38
Figure 37: PC IP Address Setting .................................................................................................................... 40
Figure 38: Input IP Address .............................................................................................................................. 40
Figure 39: Input User Name and Password .................................................................................................... 41
Figure 40: Web GUI Main Screen .................................................................................................................... 41
Figure 41: [Devices] Sceen ............................................................................................................................... 42
Figure 42: MU Device - Monitoring Unit ................................................................ ........................................... 43
Figure 43: MU Device - Optical Unit ................................................................................................................. 43
Figure 44: MU Device - RF Unit ....................................................................................................................... 44
Figure 45: RU Device ........................................................................................................................................ 45
Figure 46: RU Device – 700.............................................................................................................................. 46
Figure 47: RU Device – External Alarm ........................................................................................................... 46
Figure 48: [Auto Setup] Screen ................................................................................................ ........................ 47
Figure 51: [Auto Setup] Screen ................................................................................................ ........................ 48
Figure 53: Function - Device Info. .................................................................................................................... 48
Figure 54: Function - Import&Export ................................................................................................................ 49
Figure 55: Function - Summary ........................................................................................................................ 50
Figure 56: Function - Comm. Setting (SNMP) ................................................................................................. 50
Figure 57: Function - Comm. Setting (UDP) .................................................................................................... 51
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Figure 58: Function - IP Setting ........................................................................................................................ 51
Figure 59: Function - Scan ................................................................................................................................ 52
Figure 60: Function – After Scan ...................................................................................................................... 52
Figure 61: Function - Device Remove.............................................................................................................. 53
Figure 62: Function - New Site Report ............................................................................................................. 54
Figure 63: Function - PA Reset ................................................................ ........................................................ 54
Figure 64: Function - Device Reset .................................................................................................................. 55
Figure 65: Function - Clear History Alarm ....................................................................................................... 55
Figure 66: Function - Firmware ........................................................................................................................ 56
Figure 66: Function – Alarm Log ...................................................................................................................... 56
Figure 66: Function – WebOMT Setting ................................................................ .......................................... 57
Figure 74: Commissioning Procedure - Start .................................................................................................. 57
Figure 75: Commissioning Procedure - Device Scan ..................................................................................... 58
Figure 76: Commissioning Procedure - Params Setting ................................................................................ 58
Figure 78: Flow to select ................................................................................................................................... 59
Figure 79: Flow to select ................................................................................................................................... 60
Figure 80: Commissioning Procedure - Automatic Calibration ...................................................................... 61
Figure 82: Commissioning Procedure - Calibration Finish ............................................................................. 61
Figure 83: Commissioning Procedure - MU Setup.......................................................................................... 62
Figure 85: Commissioning Procedure - RU Setup .......................................................................................... 62
Table 1: MU Components ................................................................................................................................. 13
Table 2: RU Components.................................................................................................................................. 13
Table 3: Master Unit (MU) KOP ........................................................................................................................ 14
Table 4: Remote Unit (RU) KOP ...................................................................................................................... 15
Table 5: MU Connections.................................................................................................................................. 30
Table 6: RU Connections .................................................................................................................................. 31
Table 7: Pin Definition of “EXT_ALM” Port for RU .......................................................................................... 36
Table 8: Pin Definition of “BTS_ALM” Port ................................ ...................................................................... 36
Table 9: MU LED Indications ............................................................................................................................ 37
Table 10: RU LED Indications .......................................................................................................................... 37
Table 11: RFU Digital Display ........................................................................................................................... 38
Table 12: FOU Digital Display .......................................................................................................................... 39
Table 13: Import/Export Parameters ................................................................................................................ 49
Table 14: MU Alarm List .................................................................................................................................... 64
Table 15: RU Alarm List .................................................................................................................................... 64
Table 16: MU Alarms Diagnosis ....................................................................................................................... 65
Table 17: RU Alarms Diagnosis ....................................................................................................................... 65
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0.3 HISTORY
Change No.
ENU
Details Of Change
1 1-0-0
This user manual first created in Oct 2017.
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ALC
Automatic Level Control
ATT
Attenuation
BDA
Bi-direction Amplifier
BS
Base Station
BTS
Base Transceiver Station
DL
Downlink
DT
Donor Terminal
FOU
Fiber Optical Unit
GUI
Graphic User Interface
ID
Identification
LNA
Low Noise Amplifier
MCU
Main Control Unit
MT
Mobile Terminal
MTBF
Mean Time Between Failures
MU
Master Unit
NC
Normally Closed
NF
Noise Figure
NO
Normally Open
OMC
Operation & Maintenance Center
OMT
Operation & Maintenance Terminal
OP
Optical Fiber
OPEX
OperatingExpense
PA
Power Amplifier
PIM
Passive Inter Modulation
PLL
Phase Locked Loop
POI
Point of Interconnects
PSU
Power Supply Unit
RF
Radio Frequency
RFU
Radio Frequency Unit
RU
Remote Unit
SMA
Sub-Miniature “A” Connector
TX/RX
Transmit/Receive
UL
Uplink
VAC
Volts Alternating Current
VSWR
Voltage Standing Wave Ratio
WCDMA
Wideband Code Division Multiple Access
0.4 GLOSSARY OF TERMS
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0.5 SAFETY NOTICES AND ADMONISHMENTS
This document contains safety notices in accordance with appropriate standards. In the interests of
conformity with the territory standards for the country concerned, the equivalent territorial admonishments
are also shown.
Any installation, adjustment, maintenance and repair of the equipment must only be carried out by trained,
authorized personnel. At all times, personnel must comply with any safety notices and instructions.
Specific hazards are indicated by symbol labels on or near the affected parts of the equipment. The labels
conform to international standards, are triangular in shape, and are coloured black on a yellow
background. An informative text label may accompany the symbol label.
Hazard labeling is supplemented by safety notices in the appropriate equipment manual. These notices
contain additional information on the nature of the hazard and may also specify precautions.
Warning:
These draw the attention of personnel to hazards that may cause death or injury to the operator or others.
Examples of use are cases of high voltage, laser emission, toxic substances, point of high temperature,
etc.
The design of the antenna installation needs to be implemented in such a way so as to ensure RF
radiation safety levels and non-environmental pollution during operation.
Note: Antennas, feeders and couplers are not included in the packing list; solution provider should
consider these accessories according to site conditions.
WARNING! Antenna gain should not exceed 12.5 dBi.
WARNING! For 1710-1755 MHz, installation must comply with 27.50(d)(4) max 1 W EIRP and fixed
station ABSOLUTE max 10 m antenna height above earth.
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 Licensee
to operate this device. Unauthorized use may result in significant forfeiture penalties, including penalties
in excess of $100,000 for each continuing violation.
Note: The grantee is not responsible for any changes or modifications not expressly approved by the
party responsible for compliance. Such modifications could void the user’s authority to operate the
equipment.
To comply with FCC RF exposure compliance requirements, each individual antenna used for this
transmitter must be installed to provide a separation distance greater than 122cm or more from all
persons during normal operation and must not be co-located with any other antenna for meeting RF
exposure requirements.
Alert:
These draw the attention of personnel to hazards that may cause damage to the equipment. An example
of use is the case of static electricity hazard.
Caution notices may also be used in the handbook to draw attention to matters that do not constitute a
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risk of causing damage to the equipment but where there is a possibility of seriously impairing its
performance, e.g. by mishandling or gross maladjustment. Warnings and Cautions within the main text do
not incorporate labels and may be in shortened form.
WARNING!
Use only authorized and approved antennas, cables and/or coupling devices! The use of unapproved
antennas, cables or coupling devices could cause damage and may be of violation of FCC regulations.
The use of unapproved antennas, cables and/or coupling devices is illegal under FCC regulations and
may subject the user to fines.
End of Section
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1 GENERAL INFORMATION
The ComFlex-6800 Series Distributed Antenna System (hereinafter called “ComFlex”) consists of Master
Unit (MU) and Remote Unit (RU). The MU includes the MU Chassis, Power Supply Unit (PSU), Fiber
Optical Unit (FOU) and RF Unit (RFU). With a modular design, it can support up to 8 independent RF
inputs and 8 Remote Units. The Remote Unit is designed with a compact and slim form factor for easy
installation; it is an integrated design which supports 6 independent bands, 700MHz (lower ABC)/700MHz
(upper C), 800MHz/850MHz, 1900MHz and EAWS band.
The low signal transmission loss of optical fiber is applicable for long distance transmission. ComFlex can
support the optical transmission of up to 6.5dBo optical loss, equivalent to 8 miles fiber length.
Main feature:
Industry’s first DAS system with superior PIM performance MINI-DIN RF connectors.
Independent coupling port for uninterrupted network testing.
Modularized Master Unit supports flexible field upgrade and maintenance.
Independent gain control for each RF source.
High MTBF and low noise design with modular PSU and convection cooling.
RF module supports both simplex and duplex.
Compact slim Remote Unit for OPEX saving.
Supports multi-operator and mix mode application.
Optical link auto gain control.
Web based GUI for intelligent commissioning and configuration.
The figures below show the ComFlex Master and Remote unit enclosure.
Figure 1: Master Unit (MU)
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Figure 2: Remote Unit (RU)
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Optical Fiber
MU
Antenna
RU
2 EQUIPMENT DESCRIPTION
2.1 SYSTEM DIAGRAM
Figure 3: System Diagram
On the DL, signals from the BTSs or BDA are converted into optical signals after amplification in the
MU.Then the optical signals are transmitted to the RU via optical fiber. The Optical TX/RX Module of RU
converts the DL optical signals into RF signals. After amplification, the signals are transmitted at the MT
port to the service antenna.
On the UL, the signals transmitted by the mobile are converted into optical signals, and then via the UL
optical fiber, the signals are transmitted to MU, which then converts the optical signals back to RF signals.
2.2 TYPICAL APPLICATION
Shown below are the typical SISO applications of MU and RUs.
Figure 4: Typical Application
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Module
Description
MU01-RACK
Master Unit Chassis includes eight slots for RF Unit, two slots for Fiber Optical
Unit, and one slot for Power Supply Unit.
MU01-PSU
iDAS Master Unit Power Supply Unit (PSU) converts the input voltage into stable
DC to supply power for other modules of Master Unit.
MU01-FOU
Master Unit Fiber Optical Unit (FOU) completes optical signal and RF signal
conversion. One FOU has four optical ports, which means each FOU can support
up to four RUs.
MU01-RFU
Master Unit RF Unit completes separation and combination of uplink and downlink
signal with independent gain control, supports either simplex or duplex.
Module
Description
LRU01-6800
Low Power Remote Unit (1W); A compact and slim design which supports 6 bands,
including 700MHz (lower ABC, upper C), 800MHz/850MHz, 1900MHz and EAWS
band.
MRU01-6800
Medium Power Remote Unit (5W); A compact and slim design which supports 6
bands, including 700MHz (lower ABC, upper C), 800MHz/850MHz, 1900MHz and
EAWS band.
LRU01-PSU
Remote Unit Power Supply Unit (PSU) converts the input AC voltage into stable
DC, to supply power for Remote Unit. It can be installed on RU or on wall beside
RU.
2.3 EQUIPMENT CONSTITUTION
MU consists of the following parts:
Table 1: MU Components
RU consists of the following parts:
Table 2: RU Components
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2.4 KIT OF PART
Item
Qty
Image
MU Chassis
1
RF Unit (RFU)
1~8
Fiber Optical Unit (FOU)
1~2
Power Supply Unit (PSU)
1
Power Supply Cable
(13 Feet 1 inch)
1
Communication Cable
1
Right Angle Bracket
(for MU 19“rack mounting)
1
Left Angle Bracket
(for MU 19“ rack mounting)
1
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Table 3: Master Unit (MU) KOP
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Item
Qty
Image
Remote Unit
1
RU Power Supply Unit
(with1 foot 9 inches. DC cable and 13
feet 1 inch AC cable )
1
Mounting Rack
(for RU wall mounting)
1
Masonry Bolt (set) M8x80
( for RU concrete wall mounting)
4
Masonry Bolt (set) M8x80
(for PSU concrete wall mounting)
2
Nuts M6x10, Spring Washers Φ6, Plain
Washers Φ6
(for PSU mounting on RU)
2 pieces each
Nuts M6x10, Spring Washers Φ6, Plain
Washers Φ6
(for RU grounding)
2 pieces each
GND Cable
(for RU grounding)
1
Nuts M6x10, Spring Washers Φ6, Plain
Washers Φ6
(for PSU grounding)
2 pieces each
GND Cable
(for PSU grounding)
1
Table 4: Remote Unit (RU) KOP
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3 INSTALLATION
3.1 WARNINGS AND ALERTS
Laser
Laser light can cause damage to 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 WHICH 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, 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.
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3.2 SITE PLANNING CONSIDERATIONS
3.2.1 SITE PLANNING
Site Considerations
The MU is designed to be located indoors to facilitate coupling of BTS signals and power supply
connections. The input range of MU RF unit is 10~30 dBm.
The site consideration for RU is listed below:
The distance between the service antenna of RU and coverage area should satisfy line of sight
requirements for maximum coverage area.
The maximum fiber length is 8 miles, with a maximum path loss of 6.5dBo.
The system delay of the optical system must be taken into consideration when there are neighboring
BTS sites overlapping in coverage.
Installation Location
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 temperature and unrestricted air-flow.
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.
Powering
The power supply unit (PSU) provides power to all modules within the equipment. Depending on the
product variant, it is recommended that the PSU operates on a dedicated AC circuit breaker or fused
circuit.
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 and RU:
coaxial cables, optical fibers, power cable, communication cable, and commissioning cable. Where
applicable, ensure cables are properly routed and secured so that they are not damaged.
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Manual Handling
During transportation and installation, take necessary handling precautions to avoid potential physical
injury to the installation personnel and the equipment.
3.2.2 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, couple BTS RF signal with a coupler to prevent damaging the equipment.
Where appropriate, confirm available of suitably terminated grade of RF and optical fiber.
Observe handling of all cables to prevent damage.
3.3 INSTALLATION PROCEDURES
3.3.1 GOODS INWARDS INSPECTION
ComFlex was factory tested, inspected, packed, and delivered to the carrier with utmost care. Do not
accept shipment from 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.
3.3.2 TOOLS
See Appendix A for a full list of tools required for installation and maintenance.
3.3.3 PREPARATION
Optical Fiber:
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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”)
3.3.4 MU ASSEMBLING
ComFlex Master Unit consists of 4 parts: Chassis, RFU, FOU and PSU. All the units are packed
separately. Follow the steps below to assemble.
Figure 5: ComFlex Master Unit
Step1: RF Unit installation: Remove RFU slot cover plate on Chassis, insert RFU and fasten the screws.
(Each Unit can be installed in any one of eight RFU slots)
Figure 6: RF Unit Installation
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Step2: FOU installation: Remove FOU slot cover plate on Chassis, insert FOU and fasten the screws.
(Each Unit can be installed in either one of two FOU slots)
Figure 7: FOU Installation
Step3: PSU installation: Remove PSU slot cover plate on the right side of Chassis, insert PSU and fasten
the screws.
Figure 8: PSU Installation
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3.3.5 MU IN 19” RACK MOUNTING
MU is an indoor type device; the installation procedures are shown as below:
Step 1: Install right angle bracket and left angle bracket on back of the mounting rack. (Rack nuts and
screws are not provided.) Use rack nuts and screws as recommended by rack manufacturer.
Figure 9: Mounting Rack
Figure 10: Angle Iron Installation
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