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ATT-002-290-370 A TT-002-290-370 UMTS UMTS DNB DNB RF Operation Operatio n Guideli Gui delines nes Abs A bs tr act ac t : This Guideline provides high level guidance for UMTS UMTS Distribu Distribu ted Node B (DNB) (DNB) RF operation operation includi ng plumbing , ordering information, planning and installation installation issues.
Aud A ud ienc ien c e: Product Name: Effective Date:
NA
Published :
Issue 4, 06/22/11
Expires On: Related Documents: Canceled Documents: Issuing Department: Department:
National RAN
Business Unit:
NP&E
Points Of Contact:
Ming Ho
Au th or (s): See Contact List
ATTUID
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Tabl Table e Of Of Contents Con tents Reason For Current Issue 1.
2.
3. 4.
5.
6. 7. 8. 9.
Ab outt This Abou Th is Doc Docum um ent 1.1. Purpose 1.2. Scope 1.3. Au Audi di enc ence e 1.4. Related Documentation Introduction 2.1. Erics son UMT UMTS S DNB DNB 2.1.1. Main Unit Remote Radio Hea Head d 2.1.2. OBIF 2.1.3. 2.2. AL ALU U UMTS DNB DNB Ordering DNB DN B Installation 4.1. Sheltered Site 4.2. Outdoor Site 4.3. Rooftop Site DNB DN B Operation and Support 5.1. E-9 E-911 11 suppor t 5.2. Cable and Sweep 5.3. RX-AIT 5.4. TMA Support 5.5. RE RET T Support 5.6. Al arm armin in g 5.7. Batte Battery ry Backup Requirements Requirements for DN DNB B Appen Ap pendi dix x A Tran Transm sm it Pow Power er Lim L im it s in i n CMRS Bands Ban ds Appen Ap pendi dix x B Am Ameri erican can Wir e Gauge (AWG) (A WG) Table Ackn Ac know owled ledgem gement ents s Contact List A.1. Document Specific Specific Acrony ms A.2. Ac Acro ro ny ms Dic ti on onary ary
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Reason For Current Issue Issue Number
Date
Description
Published By
4
06/22/11
Updated with new hardware mh8532 and feature information.
1. About This Document 1.1. Purpose The purpose of this document is to provide RF equipment and operation gui delines for UMTS Distributed Node B (DNB).
1.2. Scope This document addresses Distributed Node B ordering, equipment operation and installation guidance or practices. The commissioning, administration and maintenance of DNB is beyond the scope of this document and should refer to DNB vendors’ documents.
1.3. Audience The audience for this document includes AT&T Mobility RF Planning, Equipment, Operation personnel, and contractors involved with Distributed Node B installation and operation.
1.4. Related Documentation The following documents are related to this document:
[1]
PL-218 UMTS DNB Policy Letter
[2]
Non-Standard Equipment Justification Form
[3]
ATT-002-290-041 (ND-00026) RF Connector & Weatherproofing Guidelines
[4]
ATT-002-290-383 ( ND-00071) Grounding Standard AT&T Proprietary (Internal Use Only) Not for use or disclosure outside the AT&T companies, except under written agreement. 2011 AT&T Intellectual Property. All rights reserved. 1
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[5]
ATT-002-290-142 (ND-00157) RF Surge Arrestor Guidelines
[6]
ATT-002-290-043 (ND-00029) Antenna/Cable System Sweep MOP
[7]
ATT-002-290-172 (ND-00194) RX-AIT Guidelines
[8]
ATT-002-290-316 (ND-00354) PIM Measurement MOP
[9]
ATT-002-290-150 (ND-00170) TMA Guidelines
[10]
ATT-002-290-125 (ND-00135) RET Guidelines
[11]
ATT-TELCO-002-200-381 Fiber Optic Connector & Adapter Inspection and Cleaning Tools & Procedures
[12]
ATT-TELCO-JA-000-000-433 Understanding OTDR
2. Introd ucti on The Distributed Node B (DNB) is the next step in the evolution of the Classic/Macro Node B. The Original Equipment Manufacturers (OEMs) have evolved their UMTS Node B platform to the distributed architecture, i.e., Remote Radio Heads (RRH) and Baseband Unit (BBU). Looking forward LTE will offer “only” distributed architecture. AT&T's leadership has made a strategic business decision to move forward with the Distributed Node B (DNB) deployment [1]. Figure 1 is illustrating the DNB’s evolution from the Macro architecture, DNB’s components, advantages and challenges. Key DNB advantages include the following:
•
Less footprint
•
Less power consumption
•
RRH can be close to antenna resulting less feeder loss
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Figure 1: DNB's evolution, components, advantages and challenges.
The Distributed Node B contains several major components:
•
Base Band Unit (BBU) or Main Unit (MU)
•
Remote Radio Head (RRH)
•
Mounting Kit/Set (rack, wall, pole, floor)
•
Power, fiber and alarm cables including Bias-T cables and daisy chain fiber jumpers
A BBU supports several RRH’s based on Common Public Radio Interface (CPRI)
Footnote: Currently the protocols between RRH and BBU are OEM proprietary.
at a distance up to 15 km (~ 9 miles) to the 1st RRH. The overall can achieve up to 35 km.
NOTE: Initially , the distanc e between BBU and RRH will be lim ited to < 300m in ord er to meet E911 requirement.
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Figure 2: Comparisons between DNB and macro Node B.
2.1. Eri csson UMTS DNB Ericsson UMTS DNB includes the following key products. Each BBU can support a maximum of 6 RRH’s. The Transmitter Board (TXB) and Random Access and Receive Board (RAXB) cards in the baseband unit are the same cards we currently are using for the 3206 and 3106 deployment and so are T1, DS3 and Ethernet cards.
2.1.1. Main Unit
•
3418 Indoor Base Bans Unit (Figure 3)
°
Size H x W x D : 7” x 17.7” x 10.6”
°
Weight: 45 lbs (fully equipped)
°
It can be mounted in 19” rack with 4U height. AT&T Proprietary (Internal Use Only) Not for use or disclosure outside the AT&T companies, except under written agreement. 2011 AT&T Intellectual Property. All rights reserved. 4
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Figure 3: Ericsson Indoor Baseband Unit 3418.
•
3518 Outdoor Base Bans Unit (Figure 4)
°
Size H x W x D : 18.7” x 13.4” x 12.3” (includes fan)
°
Weight: 73 lbs (fully equipped)
°
Operating temperature range: -27 ºF to +122 ºF
Figure 4: Ericsson Indoor Baseband Unit 3518.
•
RBS 6601 is the next generation main unit. It is 1.5U height and is powered by -48 VDC. One RBS 6001 can house a DUW-30 as shown in Figure 5.
°
Weight is less than 22 lbs with DUW.
°
Size: 2.6” x 19” x 13.8”
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°
Operating temperature range: 41 ºF to +122 ºF
Figure 5: 6601 w DUW.
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RRUW Remote Radio Head supports 2 carriers at up to 60 W total. The 1st generation Ericsson RRU22 can be replaced with RRUW without any issue. Please make sure to use the correct Radio Building Block.
•
Size (including sun shield): 25” x 15” x 6.7”
•
Weight (including sun shield): 44 lbs (20 kg)
•
Support co-siting ports: RXA I/O, RXB I/O and RXAOUT that can be configured either as input or output.
NOTE: RXAOUT gain (18 dB) is 1 dB hott er th an RXA I/O (17 dB).
NOTE: Ericsson RRH like RRU22 and RRUW should be mount ed vertically wit h cl earance distances specified by Ericsson do cuments even they are installed inside the shelter to ensure prop er airflow.
2.1.3. OBIF OBIF Optic Baseband Interface can be used to expand exi sting macro Node B to support up to six additional RRUW's for UMTS carrier-added application. The OBIF board will be installed in the 2nd baseband pool of macro Node B.
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Figure 6: Exemplary OBIF configuration.
2.2. ALU UMTS DNB Alcatel-Lucent DNB includes the following key products. ALU DNB cannot support more than 6 sector carriers due to the limitation of three UCU-III cards.
•
9396 d2U Base Band Unit (Figure 7)
°
Size H x W x D : 15.7” x 17.3” x 3.5”
°
Weight: 25 lbs
°
It can be mounted in 19” rack with 2U height.
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Figure 7: ALU Base Band Unit: 9396 d2U
•
9396 d2U Outdoor Enclosure (Figure 8)
°
Size H x W x D : 18.9” x 24.6” x 7.9”
°
Weight: 60 lbs
°
Operating temperature range: -40 ºF to +131 ºF
Figure 8: ALU BBU outdoor enclosure.
•
9341 RRH Remote Radio Head (Figure 9) at 40 W or 60 W output power. Daisy chain feature allows up to three RRH’s . Please note that there is no physical difference between 40 W and 60 W RRH. If someone needs to know, they could call or check the WMS for the inventory of which one is on the site
°
850 MHz: 9.8” x 22.4” x 8.3”, 53 l bs
°
1900 MHz: 9.8” x 18.1” x 8.3”, 44 l bs
°
Weight (including sun shield): 64 lbs
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Figure 9: ALU RRH 9341.
3. DNB Ordering Per Policy Letter - 218 [1], effective July 7th, 2009 all orders for the UMTS NodeB should go through the DNB/Macro selection process for both Ericsson and ALU with known exceptions described i n that document. This applies to all POR and BAU sites. SCM is monitoring the DNB forecast and ordering. Typical l ead time for DNB is 45 days
•
All DNB products should be ordered and processed using EPL and exception codes must be highlighted during ordering process to alleviate any questions or delays.
•
All AC powered DNB ordering require exception process.
Footnote: ALU does not offer AC version DNB.
•
The recommended DNB spare is 1 per 100 deployed units based on MTBF data.
Please refer to the following URL for more details regarding DNB. http://ns.cingular.net/sites/RFEng/tools_d.aspx
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4. DNB Inst allation
•
UMTS Remote Radio Heads (RRH) are NOT recommended for mounting at the top of towers except NSB sites.
•
Until further notice, distance between Remote Radio Heads (RRH) and BBU should be less than 300 m (~ 984‘) due to the following concerns:
•
°
E911
°
Enterprise systems need to be evaluated in order to capture site data that reflects the distributed architecture of the equipment. These Cadence, CASPR, CDMS, CinguLINC, CSSng, CTS, Granite, Guardian, MTi/Clarify, NDR, NetCool, OSS, Scout, and Siterra.
ATT approved DNB will only be power by -48 VDC. DC-DC converter is needed if your existing power plant is 24 VDC. SCM and working to create the SKUs to support DNB power and ancill ary equipment. For more details, please refer to Cell Site Design Standards group link. http://ns.cingular.net/sites/EngOpsSup/DistRecvCellSite/default.aspx
•
More vendor specific DNB documents such as product technical description, installation, operation and maintenance can be found in the following URL: http://ns.cingular.net/sites/RFEng/tools_d.aspx
•
All outdoor connections of the RRH require weatherproofing. These include RF, fiber and power interfaces. Please refer to ATT-002-290-041 (formerly ND-00026) RF Connector and Weatherproofing Guidelines [3] for more details.
•
All DNB equipment must be properly grounded per vendor’s recommendation. ATT-002-290-383 (formerly ND-00071) lists AT&T's Grounding Standards [4].
•
All DNB equipment should be installed with surge protection in RF and DC paths. Please refer to ATT-002-290-142 (formerly ND-00157) RF Surge Arrestor Guidelines [5] for more details.
•
When daisy chaining is required and multiple DNBs serve the same sector, it is possible to increase redundancy by daisy chaining the 2nd DNB on a different sector. For example (assuming a 2 sector site), fiber run 1 feeds one DNB on the “A” sector and then is cascaded to a DNB on the “B” sector. Fiber run 2 would feed a DNB on the “B” sector then cascade to the DNB on the “A” sectors. This way, if one first DNB fails it takes out 50% of the “A” sector and 50% of the “B” sector instead of 100% of one sector.
•
Please refer to the following link for exemplary RF plumbing diagrams for DNB to support UMTS multi-carrier deployment. http://ns.cingular.net/sites/RFEng/tools_d.aspx?RootFolder=%2fsites%2fRFEng%2fDistributed%20Node%20B %20DNB%2fRF%20Plumbing&View=%7b6D77F20C%2d5FA8%2d438D%2dBDD7%2d5E7AF4802C63%7d
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NOTE: Please note when operating the Distributed Node B, make sure the output ERP does not exceed FCC limit. Ap pen di x A li st s m or e det ail s.
4.1. Sheltered Site Figure 10 depicts a typical DNB installation in a sheltered environment when the distance between the BBU and RRH is less than 100’.
•
Install the BBU inside the shelter on available rack or on the wall with supporting brackets.
•
RRH should be installed outside the shelter to reduce the load on HVAC. It can be installed on the wall, pole, floor stand or frame. RRH should only be installed inside the shelter for legitimate reasons such as risk of theft, bullet risk, extreme weather, additional lease cost, lack of hatch ports, or long feedline loss.
•
All cables pass through cable entry ports (pass-through holes) require sealing. These include RF, fiber and power cables.
•
Use enclosure-type RF weatherproofing kit like RFS WSHIELD, 123eWireless EasySeal™, Tyco GSIC™ or equivalent for RRH to support easy removal/installation when troubleshooting or sweep i s required.
•
The RRH RF output will be routed back into the shelter to diplexer, RX-AIT etc. then connected to hatchplate. For NSB sites or sites with flexibility on the feeders or co-siting, it is not necessary to route RF jumper cables into the shelter. The RF output of the DNB can be connected to feeders via short jumper cable directly.
•
RRH can power TMA and the configurations are same as existing Node B.
•
DNB RET functionality will not be used due to interoperability concern with existing RET antenna vendors. RET should be powered or controlled by separate RET controller via RET Bias-T or dedicated AISG home-run cable.
•
It is noted that additional lease/rent may occur depends upon the contract and markets. National Real Estate group is investigating any impact to MLA.
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Figure 10: Typical DNB installation in a sheltered environment when the distance between the BBU and RRH is < 100'.
When the distance between the BBU and RRH is more than 100’, it is recommended to install power and fiber demarcation boxes outdoor as shown in Figure 11. The demarcation box provides cable interconnection management for cleaner cabling and easy installation. DC surge protection may be included too. It will be more economical to put the surge protectors on the distribution bars than the indivi dual conductors when the RRH's are mounted on the tower (one surge arrestor between the hot and return bar on the power plant and one between the return bar and the site ground) since all DC pairs will have roughly the same induced voltage on them from a lightning strike. Additionally, install excess boxes to loop extra length fiber cable that may be used when the RRH’s are moved to the tower top later.
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Figure 11: Typical DNB installation in a sheltered environment when the distance between the BBU and RRH is more than 100'.
4.2. Outdoor Site Figure 12 depicts a typical DNB installation in an outdoor environment when the distance between the BBU and RRH is less than 100’.
•
Install outdoor BBU at location close to existing outdoor cabinets. It can be installed on the pole/frame, floor stand or hanged on the cabinet wall. Approved outdoor cabinets are listed in the following http://ns.cingular.net/sites/EngOpsSup/DistRecvCellSite/default.aspx
•
Install RRH close to the hatchplate or at the bottom of the tower. It can be installed on the pole or frame.
•
The fiber cable from BBU to RRH will have 12 pairs of fiber cable. Each RRH has its own fiber cable; daisy chain connection is not recommended at this moment . AT&T Proprietary (Internal Use Only) Not for use or disclosure outside the AT&T companies, except under written agreement. 2011 AT&T Intellectual Property. All rights reserved. 14
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•
Use enclosure-type RF weatherproofing kit like RFS WSHIELD, 123eWireless EasySeal™, Tyco GSIC™ or equivalent for RRH to support easy removal/installation when troubleshooting or sweep i s required.
•
The RRH RF output will be connected to hatchplate via RF jumper cables.
•
RRH can power TMA and the configurations are same as existing Node B.
•
DNB RET functionality will not be used due to the interoperability concern with existing RET antenna vendors. RET should be powered or controlled by separate RET controller via RET Bias-T or dedicated AISG home-run cable.
Figure 12: Typical DNB installation in an outdoor environment when the distance between BBU and RRH is < 100'.
When the distance between the BBU and RRH is more than 100’, it is recommended to install power and fiber demarcation boxes as shown in Figure 13. The demarcation box provides cable interconnection management for cleaner cabling and easy installation. Additionally, install excess boxes to loop extra length fiber cable that may be used when the RRH’s are moved to the tower top later.
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Figure 13: Typical DNB installation in an outdoor environment when the distance between BBU and RRH is > 100'.
Figure 14 also depicts an exemplary DNB layout for a 15” x 15” PAD. It includes a future battery cabinet and two future RRH assemblies.
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Figure 14: Exemplary DNB layout in a 15' x 15' PAD.
4.3. Rooftop Site Key advantages of deploying DNB at rooftop sites are crane is not needed for installation and no need for TMA if RRH can be installed close to the antennas. Figure 15 depicts a typical DNB installation in a rooftop environment assuming the distance between BBU and RRH is less than 100’ .
•
Install outdoor BBU at location convenient for network operations group to service. It can be installed on the pole or floor stand or hanged on the cabinet wall.
•
Install RRH close to the antennas as possibl e. It can be installed on the pole or frame. Consider FCC limits on ERP as outlined in Appendices A and B. AT&T Proprietary (Internal Use Only) Not for use or disclosure outside the AT&T companies, except under written agreement. 2011 AT&T Intellectual Property. All rights reserved. 17
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•
When installing the RRH next to the antennas, TMA's may not be required. A new link budget should be calculated. Please refer to TMA/GMA Guidelines [9] for more details.
•
The fiber cable from BBU to will have 12 pairs of fiber cable. Each RRH has i ts own fiber cable; daisy chain connection is not recommended at this moment .
•
Use enclosure-type RF weatherproofing kit like RFS WSHIELD, 123eWireless EasySeal™, Tyco GSIC™ or equivalent for RRH to support easy removal/installation when troubleshooting or sweep i s required.
•
The RRH RF output will be connected to antenna via RF jumper cables.
•
RRH can power TMA and the configurations are same as existing Node B.
•
DNB RET functionality will not be used due to the interoperability concern with existing RET antenna vendors. RET should be powered or controlled by separate RET controller via RET Bias-T or dedicated AISG home-run cable.
Figure 15: Typical DNB installation in a rooftop environment.
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5. DNB Operation and Suppor t 5.1. E-911 support The distance between BBU and RRH should be less than 300m or less due to E911 concern. Like existing UMTS Node B, E-911 support is handed off to GSM only for handsets without AGPS capability, and certain DNB configurations may not operate correctly with E911. For handsets with AGPS capability, the E911 system falls back to a method called CGI +RTT. That method uses RRH and signal path information to estimate handset location. Commercial location services location estimates also use CGI+RTT with UMTS.
5.2. Cabl e and Sweep
•
DNB RF cable sweep will be same as exiting BTS or Node B. Please refer to ATT-002-290-043 Antenna/Cable System Sweep MOP [6] for more details
•
Fiber optic cables are sensitive to mechanical stress, sharp bends, kinks, dust and dirt and require special care. Use pre-terminated fiber cables available in a variety of lengths of each vendor. Do no twist the fiber cable at minimum bending radius. Make sure not to apply excessive force to the cable for maximum tensile force values.
•
An optical interface Module ODTF-1 from Anritsu can be used with Anritsu BTS master or Site Master to perform fiber cable DTF (OTDR) plus some dedicated fiber testers. More details will be provided after evaluations are completed.
•
Power Cables should be sized according to cable run length to maintain less than a 4 volt DC round trip voltage drop between the power system output terminals and the RRH input terminals. A current level equal to 80% of the circuit breaker current rating specified shall be used for this calculation.
•
The following table shows the minimum power cable AWG (American Cable Gauge) depend upon the cable length. Refer Appendix B for more AWG cable information.
Run Length
Minimum AWG
0 to 100'
AWG 12
100 to 150'
AWG 10
150 to 250'
AWG 8
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•
250 to 400'
AWG 6
Over 400'
Separate power near RRH may be considered.
Follow local market guidelines to mark all RF, fiber and power cables if applicable.
5.3. RX-AIT No difference for RX-AIT configuration for DNB except RRH only support duplexed mode. That is, direct connection method for Node B cannot be used for DNB. Please refer to ATT-002-290-172 RX-AIT Guidelines [7] for more details.
5.4. TMA Support RRH can power TMA and the configurations will be similar to existing Node B settings . For more details regarding TMA operation please refer to ATT-002-290-150 TMA Guidelines [9].
5.5. RET Support We will not use DNB’s RET capability due to no interoperability testing with our approved RET vendors were performed yet. Currently, AT&T's only operates AISG 1.1 RET system. It should be powered and controlled through RET Bias-T or dedicated AISG home-run cable. Please refer ATT-002-290-125 RET Guidelines for more details [10].
5.6. Alarmin g Please refer to DNB OEM vendor documents for DNB alarming information. RRH can also support external alarms. DNB alarming will be tested through FMS/NetCool and into the NOC.
• •
ALU BBU supports 32 external alarms and each RRH supports six user alarms. Existing Ericsson DNB does not support any external alarm. Next generation Ericsson BBU will support 32 external alarms and each RRH can handle two external alarms.
5.7. Battery Backup Requirements f or DNB Cell site design standards regarding generators, power plant, batteries and cabinets are available in the following link:
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http://ns.cingular.net/sites/EngOpsSup/DistRecvCellSite/default.aspx
6. Appendix A Transmi t Power Limi ts in CMRS Bands
Band
Base Station Limit (urban)
Base Station Limit (rural)
Mobile Station Limit
800 MHz Cellular Part 22.913
500 W ERP
1000 W ERP
7 W ERP (typical GSM = 2W)
Upper 700 MHz Part 27.50
1000 W ERP (BW<1 MHz), 2000 W ERP (BW<1 MHz), or or 1000 W/MHz ERP 2000 W/MHz ERP
30 W ERP (mobile) 3 W ERP (hand-held)
Lower 700 MHz Part 27.50
1000 W ERP (BW<1 MHz), 2000 W ERP (BW<1 MHz), or or 1000 W/MHz ERP C2000 W/MHz ERP C-Block is Block is also allowed 50 kW also allowed 50 kW ERP for ERP for broadcast broadcast
30 W ERP (mobile) 3 W ERP (hand-held)
1900 MHz PCS Part 24.232
1640 W EIRP (BW<1 MHz), 3280 W EIRP (BW<1 MHz), or or 1640 W/MHz EIRP 3280 W/MHz EIRP
2 W EIRP
1700/2100 MHz AWS Part 27.50
1640 W EIRP (BW<1 MHz), 3280 W EIRP (BW<1 MHz), or or 1640 W/MHz EIRP 3280 W/MHz EIRP
1 W EIRP
•
All bands have now moved to a power spectral density limit (W/MHz) with the exception of 850 MHz cellular (Part 22). As the FCC has explained this is due, in part, to the risk of interference to public safety systems. As the rebanding to protect public safety is eventually completed this issue could be revisited if the 500 W limit is problematic for AT&T.
•
AT&T has purchased B-Block and C-Block licenses in the Lower 700 MHz band. Information for Upper 700 MHz band is included for completeness.
•
The following calculators were developed by CTO to assist markets to calculate the output power and determine whether it meets FCC power limits. http://ns.cingular.net/sites/RFEng/tools_d.aspx
7. Appendix B Am eric an Wir e Gauge (AWG) Table
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Figure 16: AWG Table
1 mil = one thousandth inch
8. Acknowledgements
•
A&P: Dan Edwards, Rob Taylor, Craig Palmer
•
C&E: Jeff Townend, Scott Whitney, Tom Aebersold, Rob Seawright, Chris Lee, Steve Kerr
•
NP&E:Stalin Albanes, Gerry Martinez, Kurt Huber, Ayman Mostafa, Kark Beck, Hristo Hristov
9. Contact List
Name
ATTUID
Phone #
Department / Responsibility
AT&T Proprietary (Internal Use Only) Not for use or disclosure outside the AT&T companies, except under written agreement. 2011 AT&T Intellectual Property. All rights reserved. 22
AT&T
Practice
ATT-002-290-370 Issue 4, 06/22/11
Ming-Ju Ho
mh8532
404-499-5582
NP&E National RAN
Revisio n Log Issue Number
Date
Description
Published By
4
06/22/11
Updated with new hardware mh8532 and feature information.
3
01/05/11
2
12/10/10
Please note that sd0987 is sd0987 not the owner/author of this document. Sd0987 is only correcting a technical error as part of the APEx Strategy Team. See name listed in Author tag for content related questions.
Update with new DNB hardware (e.g., OBIF) and features
mh8532
Acronyms A.1. Doc ument Specific Acronyms The following acronyms and terms are used in this document:
AWG
American Cable Gauge
BAU
Business as Usual
BBU
Base Band Unit AT&T Proprietary (Internal Use Only)
Not for use or disclosure outside the AT&T companies, except under written agreement. 2011 AT&T Intellectual Property. All rights reserved. 23
AT&T
Practice
ATT-002-290-370 Issue 4, 06/22/11
CPRI
Common Public Radio Interface
DNB
Distributed Node B
DTF
Distance to Fault
DUW
Digital Unit for WCDMA
LMU
Location Management Unit
MLA
Master Lease Agreement
NSB
New Site Build
OBIF
Optical Baseband InterFace
OTDR
Optical Time Domain Reflection
POR
Plan of record
RRH
Remote Radio Head
RXAIT
Receive Antenna Interface Tray
A.2. Ac ronyms Dictionary Refer to ATT-000-000-020, Acronyms Dictionary.
AT&T Proprietary (Internal Use Only) Not for use or disclosure outside the AT&T companies, except under written agreement. 2011 AT&T Intellectual Property. All rights reserved. 24
