district of columbia’s public safety in-building …. equipment specifications v. floor plans e....

District of Columbia’s Public Safety In-Building Radio Systems: Acceptance Test Requirements Version 2.0 Page1 Page1

District of Columbia’s Public Safety In-Building Radio Systems

GOVERNMENT OF THE DISTRICT OF COLUMBIA Office of Unified Communications, Washington, DC

Acceptance Test Requirements

Effective on May 15, 2018

Version 2.0

Public Safety In-Building Radio Systems Acceptance Test Requirements Version 2.0

GOVERNMENT OF THE DISTRICT OF COLUMBIA PUBLIC SAFETY Office of Unified Communications PUBLIC SERVICE

TABLE OF CONTENTS

DISTRICT OF COLUMBIA’S PUBLIC SAFETY IN-BUILDING RADIO SYSTEMS .................................................................... 1

1 INTRODUCTION ................................................................................................................................................... 3

2 PROCEDURE OVERVIEW ...................................................................................................................................... 4

2.1 TASKS OUTLINE ....................................................................................................................................................... 4 2.2 BUILDING OWNER/MANAGER RESPONSIBILITIES ........................................................................................................... 4 2.3 DELIVERABLES......................................................................................................................................................... 5

3 ACCEPTANCE TESTING PREREQUISITES ................................................................................................................ 5

4 ACCEPTANCE TEST PROCESS ................................................................................................................................ 6

4.1 REVIEW DOCUMENTATION PROVIDED BY THE VENDOR. ................................................................................................... 6 4.2 ACCEPTANCE TEST PREPARATION ................................................................................................................................ 7 4.3 MONITORING SYSTEM CHECK (DONE BY OUC): ............................................................................................................ 7 4.4 SITE INSPECTION ..................................................................................................................................................... 7 4.5 BDA COMPLIANCE AND CONFIGURATION CHECK ............................................................................................................ 9 4.6 BDA GAIN ADJUSTMENT: ........................................................................................................................................ 10 4.7 UPLINK NOISE CONTRIBUTION EVALUATION ............................................................................................................... 11 4.8 UPLINK SQUELCH ADJUSTMENT ................................................................................................................................ 12 4.9 ISOLATION TEST ..................................................................................................................................................... 13 4.10 FREQUENCIES AVAILABILITY VERIFICATION .................................................................................................................. 15 4.11 COMMERCIAL DAS LEVEL OF INTERFERENCE VERIFICATION (IF APPLICABLE) ..................................................................... 15 4.12 AUDIO TEST ......................................................................................................................................................... 16 4.13 COVERAGE TEST AND DATA COLLECTION ................................................................................................................... 17

Appendix 1 : Frequencies and Control Channels .............................................................................................. 18

Appendix 2: Public Safety Sites Locations ......................................................................................................... 19

Appendix 3: Antenna and Cable Sweep Testing ................................................................................................ 20

Appendix 4: OUC BDA Gain Worksheet ............................................................................................................ 24

Appendix 5: Pre-requisites ................................................................................................................................ 28

Appendix 6: Acceptance Testing Checklist Information .................................................................................... 30



1 Introduction Increasingly, public safety entities, commercial wireless service providers, and wireless users require reliable communications inside buildings and inside tunnels. For public safety, reliable two-way communications are essential throughout the whole geographical area of a jurisdiction including on-street, in tunnels and within buildings.

Effective January 2015, the District of Columbia has adopted a legislation mandating radio coverage for newly constructed buildings as recommended by the International Fire Code (see http://dcregs.dc.gov/Gateway/RuleHome.aspx?RuleNumber=12-H510 ). This legislation therefore results into the deployment of numerous in-building radio systems repeating signals from the District public safety radio network (host network) into the depth of the city’s buildings. While the Bi-Directional Amplifiers (BDA) and Distributed Antennas Systems (DAS) that make up in-building radio systems do effectively enhance coverage, they also have the potential to negatively affect both in-building and overall radio network coverage if not properly designed, installed, and maintained. Furthermore, without proper BDA/DAS records management, locating in-building systems that interfere with the network can be very challenging.

The code specifies that “emergency responder radio coverage systems and related equipment shall comply with all additional requirements, specifications and criteria established by the District of Columbia Office of Unified Communications to satisfy the operational needs of emergency responders and to prevent adverse impact on the District of Columbia’s public safety communications”. The set of documents that constitutes the additional requirements, specifications and criteria established by the District of Columbia Office of Unified Communications is available at https://ouc.dc.gov/page/oucs-public-safety-building-radio-systems-requirements. It includes:

- A presentation giving an overview of the process - A document describing in detail the process for the District validation of public safety in-building

repeater systems. - A document describing the OUC technical requirements for those systems - A document describing the OUC systems acceptance testing process - A document describing the annual testing requirements - Various forms supporting the process

The purpose of this set of documents is to serve as a reference guide to outline how in-building BDA and DAS Systems shall be designed and deployed to provide emergency responders radio coverage in buildings throughout the District of Columbia. Those documents are provided to relevant organizations to facilitate the process of implementing and operating BDAs and DAS that will provide the required radio services and not adversely affect the mission critical radio network that the Office of Unified Communications (OUC) of the District of Columbia.

http://dcregs.dc.gov/Gateway/RuleHome.aspx?RuleNumber=12-H510

https://ouc.dc.gov/page/oucs-public-safety-building-radio-systems-requirements

https://ouc.dc.gov/page/oucs-public-safety-building-radio-systems-requirements



This specific document describes the Acceptance Test Process of the Public Safety In-building Radio Systems in the District of Columbia.

2 Procedure Overview 2.1 Tasks outline This acceptance test is limited to radio functions and does not assess if the system installation complies with the Fire Code, that task being the Fire department’s and DC Regulation Authority responsibility. The system shall stay “off” and not transmitting until the next steps are completed. The objective is to ensure that the first responders obtain the required quality of service while ensuring the public safety radio network is not degraded by the implementation of the in-building repeater system. The acceptance process includes the following steps:

1. PRE-REQUISITES 2. REVIEW DOCUMENTATION PROVIDED BY THE VENDOR 3. ACCEPTANCE TEST PREPARATION 4. REMOTE ACCESS CHECK: 5. SITE INSPECTION 6. BDA COMPLIANCE AND CONFIGURATION CHECK 7. UPLINK NOISE CONTRIBUTION EVALUATION 8. BDA GAIN ADJUSTMENT 9. UPLINK NOISE CONTRIBUTION EVALUATION 10. UPLINK SQUELCH ADJUSTMENT 11. ISOLATION TEST 12. FREQUENCIES AVAILABILITY VERIFICATION 13. AUDIO TEST 14. COVERAGE TEST AND DATA COLLECTION

2.2 Building Owner/Manager Responsibilities The owner of the building is responsible for:

• Fund the testing and any troubleshooting and repairs costs if necessary • Contract one of the OUC approved vendors to perform the testing • Schedule with the approved vendor and the OUC the testing itself • In case of deficiencies, investigating the cause of the issue(s) • Fixing deficient equipment or configurations until meeting requirements.

A significantly number of buildings are built to be occupied by offices or for commercial use.

It might take a few months, sometimes years to rent all floors out. Meanwhile, some of the building interiors might not be completed when coming to perform a Public safety DAS test (floors without interior walls, no ceilings, etc.)



In that case the building is not complete i.e. the whole building still needs to be tested. The testing staff shall note which floors are not physically complete.

The transmission authorization letter sent by the OUC will specifically include which floors were complete when testing occurred and which floors were not. The letter will also explain that when significant modification will be made to the building affecting radio waves propagation and/or levels of interference, the building owner shall perform again a public safety BDA/DAS test at his cost using one of the OUC approved vendors. A non-exhaustive list of modifications affecting radio propagation includes:

• adding interior/exterior walls, ceiling, partitions, • extending the Distributed Antennas System • implementing additional wireless systems (internal systems or cellular systems for instance)

The extent of the test will depend on the modifications made to the building. It will be determined on a per case basis.

2.3 Deliverables 1. Updated OUC Uplink Budget spreadsheet:

1. Design modifications need to be included in the “Designer ‘s Settings” tab 2. Measurements need to be included in the “Objectives vs. Measurements” tab

2. Acceptance Test Checklist & results (see example in Appendix 5) 1. Information requested in the header tab 2. Checks and values included in the checklist tab. Comment as necessary. 3. Remote checks (at least one if copper DAS) 4. Coverage baseline values 5. Coverage plots (grid) & associated statistics 6. Audio test results.

3 Acceptance Testing Prerequisites Before scheduling a site acceptance test with the OUC or its approved vendor, the building owner technical representative will ensure that the following prerequisites are completed. The vendor shall provide the information below ahead of the scheduling of the testing.

1. Documentation

a. Emergency contact information b. Building Manager contact information c. Plan describing what parts of the building:

i. Are completed (including interior walls and ceilings) ii. What parts of the building the DAS has effectively been deployed

iii. What parts of the building are targeted for immediate occupancy iv. IMPORTANT NOTE: All rooms of the building will be tested

d. As built drawings including the following files:



i. antenna layout with identification (labeling) of antennas, splitters/couplers and

remote units (if applicable) and their locations, ii. coverage maps,

iii. link budgets, iv. equipment specifications v. floor plans

e. Antenna and cable sweep testing results f. PIM Testing results (if applicable) g. IP address and login credential to remotely access the BDA

That documentation shall be sent to [email protected].

2. Site completion

a. Verification that the building completion actual status matches the description in section 1.c.i;

b. All spaces are clear for walking with a test cart. c. Verification that all DAS infrastructure is installed in its permanent location (antennas, etc.)

according to description in section 1.c.ii. 3. DAS Integrator’s representative

a. Verification that the technician present has all necessary equipment to access BDA/DAS management system.

b. Verification that the technician is capable of changing antenna azimuth for donor antenna if alternate donor site is selected by OUC/OUC representative.

c. Ensure that the technician has assorted spare attenuation pad’s (or variable pads) if adjustments are determined necessary.

d. Ensure the technician brings a spectrum analyzer and a signal generator. 4. Configuration.

a. Vendor has verified that BDA is configured and bench tested with 1 filter per OUC Channel. (Deviations to be approved by OUC in advance)

b. Verification that the BDA has been configured with adequate padding to protect it from OUC macro sites, and uplink has been padded/configured per OUC noise rise criteria.

c. Verification that the “Near Test” test has been completed and adequate protection provided. This test is described in section 4.6.2

4 Acceptance Test Process 4.1 Review documentation provided by the vendor. The vendor MUST provide the information listed in the Acceptance Testing Prerequisites section above prior to the acceptance test. If the information provided is not complete, do NOT schedule the test.

mailto:[email protected]



4.2 Acceptance test preparation Before heading to the building for testing, the OUC approved testing company shall make sure that:

1. It checked with the OUC System Manager the system is available for testing during the test time period.

2. It has scheduled the test with the building POC and the OUC system manager. The OUC system manager will take the necessary steps to make sure that measurements and read received levels at all potentially affected host sites can be collected.

3. It has the data collection equipment ready. Preferably a tool that allows you to plot on the floor plan RSSI and other parameters

4. It had defined a grid according to the following guidelines: a. Building drawings for each floor will be reviewed and test locations marked to determine

these test locations as part of a test plan prior to actual testing. Grids must be created such that the long length of the grid is under 125% of the length of the short length of the grid. For example, a 40x50 grid is acceptable; a 20*26 grid is not acceptable.

b. For floors less than 32,000 sq. ft., each floor of the building shall be divided into grids of 20ft x 20ft each.

c. For floors between 32,000 sq. ft. and 128,000 sq. ft., each floor of the building shall be divided into 20 Grids.

d. For floors over 128,000 sq. ft., each floor shall be subdivided into 40 grids. 5. You have two portable radios fully charged, calibrated, and programmed with in-building testing

code plug. 6. You have another voice communication device like your mobile telephone in case radio

communication is not possible. 7. The remote access to the BDA will be performed by the OUC

4.3 Monitoring system check (Done by OUC): • Notify monitoring agencies of system test

• Remotely login into the monitoring system (via wireless modem for instance)

• Check that you can shut down the system

4.4 Site inspection 1. Check Head end room for any alarms or loose connection

a. Enclosure: both BDA, DAS head-end and batteries active components are in NEMA-4 enclosures.

b. Signage

On a Red background with Yellow Lettering

District of Columbia Fire Department Radio



Contact OUC Radio Engineering

(202) 373-3700

c. Cables labeling (needs to match the as-built drawings)

d. Check grounding of the BDA

e. Check that local system shutdown functions.

2. Roof Top Measurement and inspection:

f. Make sure physically the donor antenna is ok, there is no apparent rust or damage due to weather condition

g. Take measurement of received signal at host site transmitting with a portable and omni-antenna. Have the system manager read received levels at at least 3 possible sites. Make sure that your body is not masking the path loss (raise your arm with the portable). Make also sure you move a few feet left and right while the measurements are made such that you avoid fading holes. Multiple test locations might be necessary to ensure a view towards each Host Site.

h. Check Grounding: Check the antenna and mount are grounded as well as the coax outside and the equipment in the room it is located at. After many years of service, grounding system can deteriorate and so does its performance; make sure the connection to the ground is not corroded or disconnected. Make sure the grounding meets industry standard grounding guidelines (R56 or equivalent)

i. Check the surge arrestor shows no damage and is properly grounded.

j. Make sure all cables and antennas are clearly labeled to facilitate potential future troubleshooting.

k. Check that the labeling matches the as-built drawings

3. Battery backup needs to be tested:

l. Check the alarms display and make sure there are no existing alarms.

m. Unplug the AC cable and make sure the BDA power switches to battery backup

n. Check the alarm on the BDA/DAS are also visible (these may be at the fire annunciator panel)

o. Check that you can remotely login into the monitoring system and that the alarms were sent.



Before After

4.5 BDA compliance and configuration check OUC BDA requirements call for Class A BDAs and one filter per channel. Depending on the BDA vendor and the model, that might require the combining of several BDAs. The channels’ bandwidths are also generally configurable. The filter bandwidth for OUC BDAs needs to be set to 12.5 kHz.

1. Connect the signal generator, the attenuator and the spectrum analyzer as described above. 2. Generate the signal scanning through the whole spectrum of interest (may be split the 800 MHz

and the 700 MHz spectrum) a. If equipment is unable to show single channel resolution on a sweep, per channel verification

may be needed. 3. Check that the BDA passes all OUC channels 4. Check that the BDA filters are 12.5 kHz wide. 5. Check that the BDA is not passing any non OUC frequencies

a. Here a band sweep is necessary to rule out other filters

Power level check: make sure the power level across the various channels is about the same.



4.6 BDA gain adjustment:

1. Host receiver noise floor measurement

a. Check with the system manager that the testing frequency is clear for testing Example: “channel # 4”.

b. Make sure that the BDA is turned off and not transmitting.

c. Make sure no radio is transmitting on the selected testing frequency.

d. Ask the system manager to read the noise floor at the receiver for all the frequencies

e. Have him check that all receiver noise levels are about the same.

f. We obtained the receivers’ noise reference (~ -115 dBm).

g. Note the corresponding values: NoiseReference

2. Near signal test (Hot signal test). a. Attach spectrum analyzer to the Distribution Antenna System output right before the input

to the BDA. Set the spectrum analyzer to be in peak hold mode. b. Key a radio near an antenna at head height, (or cruiser/ambulance height for mobile

accessible antenna’s) and walk a + pattern from directly under the antenna to 6 feet in each direction. (or to the antenna’s primary lobe)

c. Verify that the received signal at the spectrum analyzer is 5 dB below the max operating input power of the BDA, and 10 dB below the max damage number.

d. Using a spectrum analyzer verify the BDA throws no spurious emissions with an input at this level.

e. Check that the signal at the host site will be below -45 dBm based on path loss calculation. If not correction need to be made.

f. This test needs to be done each active segment (each segment connected to the BDA or the fiber DAS remote units if a fiber DAS is deployed.



3. Gain adjustment

a. Power up the BDA making sure it is connected in normal operational conditions.

b. Make sure that only the test radio you are using is operating on that frequency.

c. Select a location where the coverage seems the weakest (check the coverage maps from the vendor or use common sense based on the layout of the building and of the DAS).

d. Use the radio portable to transmit. The portable radio needs to be set up on the channel matching the testing frequency.

e. Ask the system manager to read the receiver value at the selected target site(s) f. Select Adjust the BDA output uplink transmit power to achieve a 18 dB SNR g. Select a location near a donor antenna fully into AGC(near test location) h. Use the radio portable to transmit. The portable radio needs to be set up on the channel

matching the testing frequency. i. Ask the system manager to read the receiver value at the selected target site(s) j. Select Adjust the BDA output uplink transmit power to verify RSSI is below 45 dBm

4. Near-Far Signal Test

a. Attach the signal generator as shown above. b. Select the transmit frequency to be 815.6125 MHz c. Adjust transmit power so that the power at the input to the BDA matches the power

recorded from the Near test. d. Using a portable from the expected worst coverage area (from 3.c) transmit on any 800

MHz channel and verify that the received signal is still 18 dB above the noise floor.

4.7 Uplink Noise Contribution Evaluation

A- Evaluate Propagation loss

1- Setup a portable to transmit on channel locked talk-group at a known power level P.

2- Connect the portable to the donor antenna jumper and transmit on the uplink channel.

a. If the donor site is close to the donor site, it is recommended to add an attenuator to avoid saturating the host receiver. In that case note the added attenuation value in the report.

3- Ask the system manager to read the received signal strength at all potentially affected OUC sites

BDA Coverage Coax

50 Ohm Load

Signal Generator -5 dBm

-5.5 dBm

Near Level -15.5 dBm



4- Note the corresponding “RxLev” values.

5- Subtract those values from the transmitted P of the signal generator.

6- We obtained the propagation loss to each potentially affected site: Path Loss = P – RxLev

B- Evaluate Noise contribution

1- Connect the spectrum analyzer to the BDA output (the output that is transmitting the uplink towards the donor antenna).

2- Ensure that no radio is transmitting on the testing frequency and make the measurement on the testing frequency.

a. This test should be performed with the squelch circuit turned off, or set low enough not to trigger.

3- Note the corresponding value that is the Noise generated by the BDA: N_BDA.

4- Calculate the contribution to noise received at each OUC site:

Noise contribution = N_BDA – PL

5- Compare those values to the Noise References. They should be significantly lower (at least 15 dB).

4.8 Uplink squelch adjustment Here the technician shall check the level of the uplink squelch.

The uplink squelch threshold shall be set 5 dB above the noise on the uplink coming out of the DAS. It can be measured as the uplink input level to the BDA by the BDA itself. The measurement of the noise shall be done for a period of at least 5 minutes while making sure that no radio is transmitting.

BDA output to Donor Antenna



4.9 Isolation test

DAS System Isolation Measurement

The most frequent problem with an in-building installation is inadequate isolation (path loss) between the donor antenna and the DAS’ antennas. When insufficient the system 'oscillates' and causes interference to itself and others. It is prohibited to operate a signal booster or BDA that oscillates.

Measure the DAS System Isolation as follows:

1. Disconnect the Donor Antenna coax cable from the off-air signal booster or BDA. 2. Use the “donor coax” and three foot jumper as shown below to connect a three (3) watt

portable radio to the Donor Antenna coax cable through the radio antenna connection. This will allow the portable radio to transmit and receive using the Donor Antenna.

3. Set the radio to test OUC FDMA Channel “example FDMA Chan

#26, 814.9875 MHz”.

Portable Radio to Donor Antenna



4. Connect the spectrum analyzer using a three (3) foot jumper to measure the power

received by indoor antenna in the selected FDMA Channel. The spectrum analyzer will be connected to the Uplink input of the BDA on DAS system “Make sure there are no radios transmitting within the building during this test”.

5. Key-up the portable radio and hold: observe the selected channel on the spectrum analyzer. Average the power measurement of selected channel for at least 10 seconds.

6. Proceed to the calculation described in the drawing below. The DAS system isolation shall be greater than 15 dB.

Measure received signal from indoor antenna



4.10 Frequencies availability verification To check that all channels are transmitted, you need to use radios that have a specific code plug. This code plug has every single frequency programmed as a conventional P25 channel. A spectrum analyzer can be used to observe the frequency and received level when the radio is keyed up through the use of a directional coupler.

1. In area with no, or poor coverage when not augmented with a BDA, verify that the BDA passes all OUC frequencies.

2. If a fiber-DAS is deployed, repeat for any passive segment connected directly to the BDA, AND each active segment connected to a remote unit.

For more details on all frequencies in use by the District of Columbia refer to Appendix 1 at the end of this document.

4.11 Commercial DAS Level of Interference Verification (if Applicable) In some cases, commercial cellular systems deployed in a building can create interference with the public system repeater system. This is in particular true if the distributed antennas are not shared between the public safety frequencies and the cellular system. To check if such interference exists,

• Make sure the commercial DAS and its feed are on. • Take a spectrum analyzer under the cellular DAS antenna the further apart from any public safety

DAS antenna. • Verify that the public safety band is free of interference, see pictures below. The first one is with the

commercial BDA off. No interference shows in the public safety band (red marker). The second one shows that with the commercial BDA on the noise raises significantly.

Commercial BDA:



4.12 Audio Test Even though signal strength and BER measurements are providing good evaluations of the quality of the coverage, the audio quality gives a sense of the ultimate quality of service perceived by the end-user.

To test the audio quality you need to:

1. Use radios with code plug installed where all 26 channels are programmed to be tested individually.

You can use the following phrase to test the uplink:

“This is OUC doing in building test. Counting 1, 2,3,4,5 do you copy?”

2. Evaluate the audio call quality using the following table:

3. Test at each test location both talk-out and talk-in will for both 700 and 800 MHz talk-groups.

4. Repeat the same process throughout each floor of the building including stairways and elevator machine rooms

5. A maximum of 5% non-adjacent areas shall be allowed to fail the test for a given floor.

6. For talk-out tests, voice calls shall be made to a portable radio at hip level.

7. For talk in tests, voice calls shall be made from a portable radio at hip level (with a shoulder mike). At a given test location, rekeying will be allowed if an initial PTT does not receive a channel grant.

8. Note the locations where the test failed.

DAQ Values Subjective Performance Description

1 Unusable, speech present but unreadable.

2 Understandable with considerable effort. Frequent repetition due to noise / distortion.

3 Speech understandable with slight effort. Occasional repetition required due to noise / distortion.

3.4 Speech understandable with repetition only rarely required. Some noise / distortion.

4 Speech easily understood. Occasional noise / distortion.

4.5 Speech easily understood. Infrequent noise / distortion.



4.13 Coverage Test and Data Collection To perform this test, you will make measurements on the control channel. Control channels are listed in Annex 1. Please check with the system manager which one is active (default is channel 2):

1. Then collect the RSSI data in dBm received with a spectrum analyzer or similar tool. 2. All floors, stairwells and areas of the building need to be measured 3. Critical areas include stairwells, headend room and emergency and standby power rooms 4. The measurements shall be grid based, the grid being developed as described in a previous section. 5. As per NFPA, the measurements within a grid will be recorded :

a. while walking an “X” pattern with the center of the pattern located approximately in the center of each grid area

b. The linear distance of each side of the “X” equal to at least 10% of the length of the grid side and a minimum length of 10 ft.

c. Measurements sampled in an averaging mode to include a minimum of 1 sample per each 5 ft. travel recorded with no less than 10 samples per measurements per side of the ”X”

6. The results need include the following: a. A Map that color code the received levels (the map needs to demonstrate that all floors,

stairwells elevators have been tested exhaustively). b. The map shall identify clearly the critical areas and the corresponding measured parameters c. Statistics that demonstrate that the criteria passed (95% per floor) d. An Excel table that shows the RSSI values measured directly under each antenna and

indicates the floor and location of the measurement. This table will clearly identify the critical areas measurements. This table will serve as a baseline for annual testing.

e. The location and identification of at least 2 fringe areas. Fringe areas are those areas where the coverage is the worst.



Appendix 1 : Frequencies and Control Channels

Public Safety 800 MHz channels: 806-824/851-869 MHz

Public Safety 700 MHz channels: 769-775/ 799-805 MHz

Control channels:

Channel 1: the frequency is 855.23750 Channel 2: the frequency is 855.46250 Channel 2 default Control Channel Channel 3: the frequency is 857.98750 Channel 4: the frequency is 858.98750

ID Rx (MHz) Tx (MHz)1 799.90625 769.906252 799.96875 769.968753 800.40625 770.406254 800.46875 770.468755 800.71875 770.718756 800.96875 770.968757 803.34375 773.343758 804.03125 774.031259 804.28125 774.28125

10 804.34375 774.3437511 809.8625 854.862512 810.2125 855.212513 810.2375 855.237514 810.4625 855.462515 811.1875 856.187516 811.5875 856.587517 811.9875 856.987518 812.1875 857.187519 812.5875 857.587520 812.9875 857.987521 813.5875 858.587522 813.9875 858.987523 814.0375 859.037524 814.0875 859.087525 814.9875 859.987526 815.9875 860.987527 806.0125 851.012528 807.0125 852.012529 806.5125 851.5125



Appendix 2: Public Safety Sites Locations



Appendix 3: Antenna and Cable Sweep Testing The cable and antenna system plays a crucial role of the overall performance of a DAS system. Degradations and failures in the antenna system may cause poor voice quality. It is the integrator’s role to troubleshoot the cable and antenna system and ensure that the overall health of Public Safety communication system is performing as expected.

Following are key characteristics that should be measured:

1. Return Loss (RL): The amount of signal that is reflected back to towards the signal source by a device due impedance mishmash. The extra energy returned to the transmitter will not only distort the signal but it will also affect the efficiency of the transmitted power and the corresponding coverage area.

RL = 10*Log (Pref/Pin) where Pref is the reflected power and Pin is input power

2. Insertion Loss or Cable Loss (IL): The amount of signal that is absorbed or dissipated by the medium or the device.

IL = 10*Log (Pout/Pin) where Pout is the output power and Pin is input power

3. Distance-To-Fault (DTF):Distance To Fault (DTF) is a performance verification and failure analysis tool used for antenna and transmission line service and maintenance



Below is step by step process to measure these characteristics:

Return Loss (RL)

1. Connect Aeroflex 3550R to the donor antenna/cable as shown in the picture above.

2. From Aeroflex 3550R menu, select Instruments then Ant-Cable Test option as show below:

3. Select the following settings on the Control1 Configuration Screen to sweep the entire 800 MHz band:

Analysis of Measurements:

A 20 dB system return loss measurement is considered very efficient as only 1% of the power is returned and 99% of the power is transmitted. In the trace below Marker1 is set at 826.67 MHz and measures a return loss of 32.80 dB and between 824 MHz and 846 MHz the transmission system is considered to have 20 dB Return loss or better.



Distance to Fault (DTF)

Return Loss measurement characterizes the performance of the overall system. If this test is failing, the DTF measurement can be used to troubleshoot the system and locate the exact location of the fault.

To measure Distance to Fault follow the same steps as in Return Loss but this time select DTF type instead of RL.

Analysis of Measurements:

Each cable/antenna tends to have a unique Distance to Fault (DTF) signature because of varying coaxial cable lengths, cable types, dielectric thickness variations, and the position of components (connectors, adapters ...) will cause different reflections at differing positions in the transmission line.

In the graph below Market 1 at 12.682 feet shows a ripple in return loss of 6.00 dB this spike could represent a connector or a dent in transmission line so it is very important to have previous antenna sweeps or at least knowledge of position of each connector/adaptor in transmission line before doing this test.

846.000



Variations in the measurements between maintenance intervals offer a good indication of degradation or damage causing conditions. A large change indicates a problem. Small changes may indicate aging.

12.682



Appendix 4: OUC BDA Gain Worksheet



Appendix 5: Pre-requisites



Appendix 6: Acceptance Testing Checklist Information

Test Date: 02/20/18 Result PASS Site Code & Name: PR-72 Wharf 1

Building Manager contact info: Building rep.technical contact info:Company: Company:Tel: Tel:Email: Email:

Emergency Contact info OUC rep. technical NameCompany: Company:Tel: Tel:Email: Email:

BDA located in room: Fiber DAS HeadEnd located in roomBDA Brand/Model Number Number of remotesIP address Fiber DAS Brand/Model NumberUserName FiberDAS HeadEnd UL Received signalPassword FiberDAS HeadEnd DL Received signal

BDA Uplink Gain 0 Donor Site Name 4DBDA Downlink Gain 0 Host Site Noise Reference Level 0

BDA Uplink Squelch Threshold Path Loss (dB) 0Isolation BDA UL Output noise 0

Noise Contribution to host site 0

Max signal received at donor site 0Min signal received at donor site 0



Date:Site: PR-72 Wharf 1Number of Remotes: 1

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Chan

nel 2

4

Chan

nel 2

5

Chan

nel 2

6

Chan

nel 2

7

Chan

nel 2

8

Chan

nel 2

9

Remote 01 Room 1 OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK

Frequencies

02/20/18



Date: 02/20/18Site: PR-72 Wharf 1

Building Top Floor Number: 13

Fringe areas: Those are elevators lobbies, exist stairs, exit path ways, emergency and standby power rooms, and any location the testing sowed the coverage was the w

Area ID Name Location description

1 Rm 510 residential room minimal coverage2 Garage 1 mechanical rooms.

ANTENNA BASELINE REFERENCE LEVELSPR-72 Wharf 1 PR-72 Wharf 1

Active. # Ant. Label RSSI Ant. # nt. Labe RSSI Ant. # nt. Labe RSSI Ant. # nt. Labe RSSIBDA ant 41 -52 BDA ant 38 -52BDA ant 42 -58 BDA ant 39 -58BDA ant 43 -58 BDA ant 40 -58

Ant. # Ant. Label RSSI Ant. # nt. Labe RSSI Ant. # nt. Labe RSSI Ant. # nt. Labe RSSIBDA ant 1 -55 BDA ant 33 -58 BDA ant 4 -48BDA ant 2 -58 BDA ant 5 -52BDA ant 3 -62 BDA ant 3 -52

BDA ant 34 -65

Floor 13 Floor 12 Floor 11 Floor 10

Floor 9 Floor 8 Floor 7 Floor 6

district of columbia’s public safety in-building …. equipment specifications v. floor plans e....

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