to return to the main menu. 148 Confidential and Proprietary Information of ZTE CORPORATION Tester Installation Connect extension cables one end to RFE jumper connector inside the cabinet and other end to Refl meter interface. If active devices such as tower top amplifier or trunk amplifier are used for feeder measurement, use jumpers to dodge it. Measuring SWR Take following steps to measure SWR: 1. Press 2. Press and select [MODE] 3. Press or to choose and press for confirmation. 4. Press

to return to the main menu. 5. Input a proper frequency range if required. 6. Check meter if required. 7. Press

to return to the main menu. 8. Press to take measurement. 9. Press to adjust screen Y-coordinates. 10. View the frequency SWR values within this frequency band, Figure 119 shows this process. 11. Press to store data. F I G U R E 1 1 9 - AN T E N N A F E E D E R S W R TE S T Confidential and Proprietary Information of ZTE CORPORATION 149 ZXC10 CBTS I2 Installation Manual Measuring DTF Take following steps to measure DTF: 1. Press 2. Press and select {MODE} 3. Press or to choose [SWR] and press for confirmation. 4. Press

to return to the main menu. 5. Input a proper frequency range if required. 6. Check meter if required. 7. Input a proper feeder length if required. 8. Press

to return to the main menu. 9. Press to take measurement. 10. Press to adjust screen Y-coordinates. 11. Press to view SWR value of each frequency point within this frequency band. Check the fault points. Figure 120 shows DTF measurement. 12. Press to save data. F I G U R E 1 2 0 - M E AS U R E M E N T O F AN T E N N A F E E D E R D TF 150 Confidential and Proprietary Information of ZTE CORPORATION Appendix Cabinet Working Modes This appendix describes cabinet working modes. Table 19 illustrates six cabinet working modes. TABLE 19 - CBTS W ORKING M ODES Working mode Description System features LS Local single mode Supports 4C3S (1X/DO) and most cost effective RS Remote single mode Supports 4C3S (1X/DO) LEA Local extended mode A This mode use two rack configuration with single BDS rack. It supports 24 CS for (1X) and 8C3S and 4C6S configuration LEB Local extended mode B This mode uses two BDS rack configuration. It supports 24 CS for (1X/EV-DO), 8C3S and 4C6S configuration. Use fiber to connect two BDS racks RE Remote extended mode Use optical fiber to enable remote extension RRFS. Supports 12 CS for (DO) or 24 CS for (1X) ME Mix extended mode This mode uses two RFS racks i.e. local and remote. This mode supports 24 CS for EV-DO and 48 CS for 1X. Uses optical fiber to enable remote extension, remote side can be CBTS and MBTS-RFS. Installation in LS mode is described before. Following section introduces cabling for remaining five modes. RS installation In RS mode, baseband module is not needed in remote CBTS. Insert optical fibre from baseband side into RMM board on remote CBTS. RE installation In RE mode, CBTS is primary base station. Upon completion of other equipments, it is only needed to lead an optical fibre out from RIM board. Then lead optical fibre to remote RF module via transmission device. LEA installation Confidential and Proprietary Information of ZTE CORPORATION 151 ZXC10 CBTS I2 Installation Manual LEA refers to extension of CBTS RF module. Use optical fibre to connect RIM on primary CBTS and RMM on extended CBTS. Connect EXT_MON ports on both primary and extensive CBTS. Figure 121 shows micro coaxial cable connectors on CBTS back plane. FIGURE 121 - M ICRO CO AXIAL CONNECTORS In LEA mode, 6 micro coaxial connectors on primary CBTS must be connected with interfaces on extensive CBTS in 1 to 1 relationship. 152 LEB installation LEB refers CBTS cabinet combination of extended RF modules and baseband modules. EXT_BDS and EXT_MON interfaces on both cabinet must be connected. Connect M_FE0,M_FE1, S_FE0 and S_FE1 interfaces on primary cabinet with same interfaces on secondary cabinet. ME installation ME mode is integration of LEB and RE. First implement local cabinet combination to extend baseband/RF and then implement remote extension with remote RF. It only needs to lead optical fibre out after LEB installation is complete. Confidential and Proprietary Information of ZTE CORPORATION Appendix Monitoring Cables Definition This section describes signal definition of four external monitoring cables used in CBTS. RS232 Connector Figure 122 shows RS232 connector. FIGURE 122 - RS232 CONNECTOR Table 20 illustrates RS232 signal definition. TABLE 20 - RS232 SIGN AL DEFINITION End A No. Colour Signal Definition White RS232 transmit Blue RS232 receive White Ground Remark First twisted-pair Second twisted-pair Confidential and Proprietary Information of ZTE CORPORATION 153 ZXC10 CBTS I2 Installation Manual RS485 connector Figure 123 shows RS485 connector. FIGURE 123 - RS485 CONNECTOR Table 21 illustrates RS485 signal definition. TABLE 21 - RS485 SIGN AL DEFINITION End A No. Colour Signal Definition Remark White O _RS485-RX First Blue O _RS485-RX+_EM twisted-pair White I _RS485-TX Second Orange －_EM －_EM I _RS485-TX＋_EM Note: twisted-pair Connect wires according to above definition. Insert two four-core cables into a DE9 connector while using both RS232 and RS485 connectors. 154 Confidential and Proprietary Information of ZTE CORPORATION 
（ On/off input cable B1 interface ） There are 10 pairs of on/off input signals. These are DB25 cable connector. Figure 124 shows on/off input cable. FIGURE 124 - ON/OFF INPUT CABLE Table 22 illustrates On/off input signal definition. TABLE 22 - ON/OFF I NPUT S IGN AL DEFINITION End A No. Colour White Blue White Orange White Green White Brown Red 10 Blue 14 Red 15 Brown 16 Red 17 Green 18 Red 19 Brown 20 Black 21 Blue 22 Black 23 Orange Signal Definition Remark First I＿SW-ONA[0] twisted-pair I＿SW-ONB[0] I＿SW-ONA[2] Second twisted-pair I＿SW-ONB[2] I＿SW-ONA[4] Third twisted-pair I＿SW-ONB[4] I＿SW-ONA[6] Fourth twisted-pair I＿SW-ONB[6] I＿SW-ONA[8] Fifth twisted-pair I＿SW-ONB[8] I＿SW-ONA[1] Sixth twisted-pair I＿SW-ONB[1] I＿SW-ONA[3] Seventh twisted-pair I＿SW-ONB[3] I＿SW-ONA[5] Eighth twisted-pair I＿SW-ONB[5] Ninth I＿SW-ONA[7] twisted-pair I＿SW-ONB[7] I＿SW-ONA[9] Tenth twisted-pair I＿SW-ONB[9] Confidential and Proprietary Information of ZTE CORPORATION 155 ZXC10 CBTS I2 Installation Manual （ Control output cables B2 interface ） Figure 125 shows control output cable. FIGURE 125 - CONTROL OUTPUT C ABLE Table 23 illustrates control output signal definition. TABLE 23 - CONTROL OUTPUT SIGNAL DEFINITION A End No. Colour Signal Definition Remark 156 White O_CONTROL[1] First Blue GNDD twisted-pair White O_CONTROL[3] Second Orange GNDD twisted-pair White O_CONTROL[0] Third Green GNDD twisted-pair White O_CONTROL[2] Fourth Brown GNDD twisted-pair Red O_CONTROL[4] Fifth 10 Blue GNDD twisted-pair Confidential and Proprietary Information of ZTE CORPORATION Acronyms Abbreviation Full Name 1x EV 1x Evolution 1x EV - DO 1x Evolution Data Only 1x EV - DV 1x Evolution Data & Voice 2C3S Two carriers and three sectors 4C3S Four carriers and three sectors A Interface - Interface between BSC and MSC AAA Authentication, Authorization and Accounting Abis Abis Interface - Interface between BSC and BTS ATM Asynchronous Transfer Mode BDS Baseband Digital System BIM BDS Interface Module BSC Base Station Controller BSS Base Station System BTS Base Transceiver Station CBTS Compact Base Transceiver Station CCM Communication Control Module CDM Clock Distribution Module CHM Channel Processing Module DBS Database Subsystem DSM Data Service Module EPLD Electrically Programmable Logic Device FA Foreign Agent FER Frame Error Rate FPGA Field Programmable Gate Arrays GCM GPS Control Module GCKM GPS Clock Module HA Home Agent HDLC High Level Data Link Control HDR High Data Rate HLR Home Location Register Confidential and Proprietary Information of ZTE CORPORATION 157 ZXC10 CBTS I2 Installation Manual 158 Abbreviation Full Name HPA High Power Amplifier IP Internet Protocol LNA Low Noise Amplifier MAC Media Access Control MBTS Master BTS MSC Mobile Switching Center MTBCF Mean Time Between Critical Failure MTBF Mean Time Between Failure MTTR Mean Time To Recovery O&M Operations and Maintenance OMC Operation and Maintenance Center OSS Operating System Subsystem OTD Orthogonal Transmit Diversity OW Order Wire PA Power Amplifier PCF Packet Control Function PDSN Packet Data Serving Node PP2S Pulse Per 2 seconds PPP Point to Point Protocol RF Radio Frequency RFS Radio Frequency Subsystem RIM Radio Interface Module RRFS Remote RFS RSSI Received Signal Strength Indicator RX Receiver SAM Site Alarm Module SBTS Slave BTS SCH Synchronization Channel SCS System Control Subsystem SDH Synchronous Digital Hierarchy SNM SDH Net Module STS Space Time Spreading TOD Time of Date TX Transmit Confidential and Proprietary Information of ZTE CORPORATION Figures Figure 1 - Hardware Installation Flow.............................................................16 Figure 2 - Carton Box...................................................................................26 Figure 3 - Cabinet Outer View .......................................................................30 Figure 4 - Installation Location Specification ...................................................31 Figure 5 - Direct Installation Mode Flow Chart.................................................33 Figure 6 - Holes Position in Direct Installation Mode (Units mm)........................34 Figure 7 - Expansion bolts Installation............................................................34 Figure 8 - Cabinet Base Fixing.......................................................................35 Figure 9 - Cabinet Base Installation ...............................................................35 Figure 10 - Uninstalling Screws and Washers ..................................................36 Figure 11 - Placing Cabinet on Base...............................................................36 Figure 12 - Adjusting Cabinet on Base ...........................................................37 Figure 13 - Fixing Cabinet and Base...............................................................37 Figure 14 - Direct Installation Mode Final View................................................38 Figure 15 - Adjustable Base Installation Mode.................................................39 Figure 16 - Adjustable Base..........................................................................40 Figure 17 - Adjustable Base Installation Mode Flow Chart .................................41 Figure 18 - Holes Position in Adjustable Base Installation Mode (Units mm) ........42 Figure 19 - Expansion Bolts Installation..........................................................42 Figure 20 - Lower Adjustable Base and Cemented Floor ...................................43 Figure 21 - Washers Specifications ................................................................43 Figure 22 - Base Upper Part Installation .........................................................44 Figure 23 - Adjustable Base and Floor Installation Final View ............................44 Figure 24 - Fixing Cabinet Base.....................................................................45 Figure 25 - Adjustable Base installation Final View...........................................46 Figure 26 - Adjustable Base Installation Mode Final View..................................47 Figure 27 - Cabling Runway..........................................................................48 Figure 28 - CBTS Cabinet Interfaces ..............................................................49 Figure 29 - Power Interfaces.........................................................................50 Figure 30 - Feeder Cable Interface ................................................................50 Figure 31 - CBTS E1 Interfaces .....................................................................51 Figure 32 - CBTS FE Interfaces .....................................................................51 Figure 33 - CBTS Room Monitoring Interface...................................................52 Figure 34 - CBTS Ordwer Wire Phone Interface ...............................................52 Figure 35 - Power Monitoring Interfaces .........................................................53 Figure 36 - CBTS External BDS Interface........................................................53 Figure 37 - CBTS External Monitoring Interface ...............................................54 Figure 38 - Crimping Pliers ...........................................................................56 Figure 39 - CBTS Power and Grounding Cable Connection.................................57 Figure 40 - Power Supply and Grounding Cables .............................................58 Figure 41 - Power Supply Cable Connections...................................................59 Figure 42 - 100ΩT1 Cable Structure ..............................................................60 Figure 43 - 75Ω E1 Cable Structure ...............................................................61 Figure 44 - 120ΩE1 Cable Structure ..............................................................63 Figure 45 - CC4Y-J32 Coaxial Cable Connector Assembly..................................64 Figure 46 - Coaxial Cable on DDF Side ...........................................................65 Figure 47 - Coaxial Connector Assembly on DDF Side ......................................65 Figure 48 - Impedance Converter ..................................................................66 Figure 49 - Impedance Converter Wiring Relationship ......................................67 Confidential and Proprietary Information of ZTE CORPORATION 159 ZXC10 CBTS I2 Installation Manual Figure 50 - Cable Straps Requirements ..........................................................68 Figure 51 - Cable Straps...............................................................................68 Figure 52 - Feeder Cable Installation .............................................................69 Figure 53 - Smog Sensor..............................................................................72 Figure 54 - Smog Sensor Cable.....................................................................72 Figure 55 - Terminal Connections at Smoke Sensor Base..................................73 Figure 56 - Temperature and Humidity Sensor Installation (Unit: mm)...............74 Figure 57 - Temperature and Humidity Sensor Cable .......................................74 Figure 58 - Infrared Sensor Cable Structure....................................................75 Figure 59 - Infrared Sensor Dimensions .........................................................76 Figure 60 - CBTS External Monitoring Conversion Cable ...................................77 Figure 61 - 3-Sector Antenna Feeder System..................................................81 Figure 62 - Antenna Installation Flow Chart ....................................................83 Figure 63 - Hoisting Antenna ........................................................................84 Figure 64 - Kathrein Antenna Installation .......................................................85 Figure 65 - Adjusting Antenna Tilt .................................................................86 Figure 66 - CBTS Main Feeder.......................................................................88 Figure 67 - 4-Hole Feeder Window (Unit: mm)................................................89 Figure 68 - Cutting Tool for Making 7/8" Feeder Connector...............................90 Figure 69 - Cutting Feeder with a Cutter ........................................................90 Figure 70 - Checking Cut Section Length ........................................................91 Figure 71 - Feeder Expanding External Conductor............................................91 Figure 72 - Connecting Front and Back Parts...................................................92 Figure 73 - Fixing Feeder Connector Front and Back Parts ................................92 Figure 74 - Wrapping Waterproof Adhesive Tapes (1) ......................................94 Figure 75 - Wrapping Waterproof Adhesive Tapes (2) ......................................94 Figure 76 - Wrapping 9 Waterproof Adhesive Tapes (3)....................................95 Figure 77 - Grounding Clip............................................................................95 Figure 78 - Wrapping Grounding Cable...........................................................96 Figure 79 - Three-Feeder Clip .......................................................................97 Figure 80 - Hoisting Feeder Up to Tower.........................................................98 Figure 81 - BTS Grounding System Cable Connection.......................................99 Figure 82 - Outer View of Grounding Copper busbar (Units mm) ..................... 100 Figure 83 - Lightning Arrester Frame Installation........................................... 101 Figure 84 - Running Feeders into Equipment Room (Method 1) ....................... 102 Figure 85 - Running Feeders into Equipment Room (Method 2) ....................... 102 Figure 86 - GPS Antenna Feeder System ...................................................... 106 Figure 87 - Tower Mounted GPS Antenna...................................................... 107 Figure 88 - Roof Mounted GPS Antenna........................................................ 108 Figure 89 - NJ-9 GPS Connector .................................................................. 109 Figure 90 - NJ-9 GPS Connector Parts .......................................................... 110 Figure 91 - Stripping GPS Cable .................................................................. 110 Figure 92 - External Conductor Assembly ..................................................... 111 Figure 93 - Shielded Layer.......................................................................... 111 Figure 94 - Inserting External Conductor Flange............................................ 111 Figure 95 - Stripping Insulation Layer .......................................................... 112 Figure 96 - After Stripping Insulation Layer .................................................. 112 Figure 97 - Inserting Insulating Plate ........................................................... 113 Figure 98 - Welding Inner Conductor Pin ...................................................... 113 Figure 99 - Cutting Shielded Layer............................................................... 114 Figure 100 - Assembling Shell and Cable...................................................... 114 Figure 101 - Shell Tightening ...................................................................... 115 Figure 102 - Board Installation Flow Chart.................................................... 118 Figure 103 - CBTS Board Slot ..................................................................... 119 Figure 104 - RFS Board Back-End................................................................ 120 Figure 105 - Board Plugging (Step 1)........................................................... 121 Figure 106 - Board Plugging (Step 1)........................................................... 121 Figure 107 - Board Plugging (Step 3)........................................................... 122 Figure 108 - Wooden Packing Box for Cabinet ............................................... 136 Figure 109 - Wooden Packing Box for Parts................................................... 137 Figure 110 - Cabinet Packing ...................................................................... 138 160 Confidential and Proprietary Information of ZTE CORPORATION Figure 111 - Sealing a Box ......................................................................... 138 Figure 112 - Inner Packing Foam Box .......................................................... 139 Figure 113 - General Paper Packing Box for Boards........................................ 140 Figure 114 - Paper Packing Box for RFE Boards ............................................. 140 Figure 115 - Packing RFE, HPA and TRX Board .............................................. 141 Figure 116 - Sealing and Packing................................................................. 142 Figure 117 - Packing Power Board ............................................................... 143 Figure 118 - Sealing Power Board Packing Box.............................................. 143 Figure 119 - Antenna Feeder SWR Test ........................................................ 149 Figure 120 - Measurement of Antenna Feeder DTF......................................... 150 Figure 121 - Micro Coaxial Connectors ......................................................... 152 Figure 122 - RS232 Connector .................................................................... 153 Figure 123 - RS485 Connector .................................................................... 154 Figure 124 - On/Off Input Cable.................................................................. 155 Figure 125 - Control Output Cable ............................................................... 156 Confidential and Proprietary Information of ZTE CORPORATION 161 Tables Table 1 - Typographical Conventions...............................................................xi Table 2 - Mouse Operation Conventions ......................................................... xii Table 3 - Safety Signs................................................................................. xiii Table 4 - Installation Location Specifications...................................................17 Table 5 - Temperature and Humidity Range....................................................17 Table 6 - Power Supply Indices .....................................................................18 Table 7 - Radiation Protection Requirements...................................................18 Table 8 - Tool and Meter List ........................................................................19 Table 9 - Adjustable Base Selection ...............................................................40 Table 10 - Power and Grounding Cable Connection ..........................................57 Table 11 - 100 Ω Internal Cable Connections ..................................................60 Table 12 - 75 Ω E1 Cable Internal Connections ...............................................62 Table 13 - 120Ω E1 Cable Internal Connections...............................................63 Table 14 - Impedance Converter Wiring relationship ........................................67 Table 15 - Terminal Connections ...................................................................73 Table 16 - Temperature and Humidity Sensor Wiring relationship ......................75 Table 17 - External Monitoring Conversion Cable Labels ...................................77 Table 18 - Feeder Models and Dimensions ......................................................89 Table 19 - CBTS Working Modes.................................................................. 151 Table 20 - RS232 Signal Definition .............................................................. 153 Table 21 - RS485 Signal Definition .............................................................. 154 Table 22 - On/Off Input Signal Definition...................................................... 155 Table 23 - Control Output Signal Definition................................................... 156 Confidential and Proprietary Information of ZTE CORPORATION 163 ZXC10 CBTS I2 Installation Manual This page is intentionally blank 164 Confidential and Proprietary Information of ZTE CORPORATION Index 4C3S .................................. 30, 157 AAA .......................................... 157 AC 18, 125, 132, 133 ANT1 .......................................... 93 ATM .......................................... 157 B 39, 60, 61, 62, 63, 72, 73, 74, 75, 147, 151, 153 BDS ........... 29, 52, 53, 117, 121, 157 BIM .......................................... 157 BS 18, 20 BSC .........19, 21, 50, 60, 62, 63, 157 BSS .................................... 80, 157 BTS ................ 53, 99, 100, 157, 158 CBTS 1, 3, 15, 16, 17, 18, 19, 21, 24, 25, 29, 30, 31, 32, 37, 48, 49, 50, 51, 52, 53, 56, 57, 60, 61, 62, 63, 64, 76, 77, 78, 79, 80, 81, 88, 99, 117, 119, 123, 124, 125, 133, 139, 144, 157 CC4Y-J32 ................................... 64 CCM .......................................... 157 CDMA2000 .................................1, 2 CHM .......................................... 157 COM ............................................ 52 DB 50 DB25 ................................... 72, 137 DB44 .....................................51, 53 DB9 .......................... 52, 74, 76, 137 DBS .......................................... 157 DC 18, 100, 132, 133 DIN-F ...................................... 101 DIN-M ...................................... 101 DOOR ......................................... 77 DOOR_MON .................................. 77 DSM .......................................... 157 DUP .......................................... 126 DV 157 E 1, 3, 27, 125, 148, 149, 150 E1 19, 29, 50, 55, 60, 61, 62, 63, 64, 66, 68, 137 E1/T1 ....................................... 68 EPLD ........................................ 157 EV 157 EXT_MON ..................................... 53 FA 157 FE 29, 50, 51 FER .......................................... 157 FPGA ........................................ 157 FREQ ........................................ 148 GCM.......................................... 157 GND................................. 49, 57, 75 GPS.29, 53, 101, 105, 106, 107, 108, 109, 110, 115, 123, 127, 128, 129, 144, 157 HA 157 HDLC ........................................ 157 HDR.......................................... 157 HLR.......................................... 157 INFORMATION ............................... 2 INFRARED ...................................77 IP 50, 158 LEGAL ......................................... 2 LNA.......................................... 158 LOSS ........................................ 148 MAC.......................................... 158 MAIN ................................. 149, 150 MASTER.......................................20 MODE ................................. 149, 150 MS 20 MSC.................................. 157, 158 MTBCF ...................................... 158 MTBF ........................................ 158 MTTR ........................................ 158 N/A............................................. 3 O&M.......................................... 158 OFF.......................................... 132 OMC.......................................... 158 OPEN ........................................ 148 OSS.......................................... 158 OTD.......................................... 158 OUT............................................77 OW 158 P 1, 3, 158 PA 133, 139, 158 PCF.......................................... 158 PDSN ........................................ 158 PGND ............................ 49, 100, 125 PMM.......................................... 133 PP2S ........................................ 158 PPM................................... 139, 142 PPP.......................................... 158 PRM.......................................... 133 PWS................................... 132, 133 PWSB .......................................... 52 R&D.............................................. 3 Confidential and Proprietary Information of ZTE CORPORATION 165 ZXC10 CBTS I2 Installation Manual R1 2 RF 123, 126, 127, 129, 158 RFE ....... 119, 136, 139, 140, 141, 149 RFE-DIV ................................... 139 RFE-DUP ................................... 139 RFS ........................... 117, 120, 158 RIM .......................................... 158 RJ11 .......................................... 51 ROOM .................................... 51, 78 ROSENBERGER .............................. 90 RSSI ........................................ 158 RX 67, 158 RX0 ...................................... 60, 63 RX1 ...................................... 60, 63 SAM .......................................... 158 SCALE ............................... 149, 150 SCH .......................................... 158 SCS .......................................... 158 166 Confidential and Proprietary Information of ZTE CORPORATION SDH.......................................... 158 SHORT ...................................... 148 SITE ..........................................20 SMOG ..........................................77 SNM.......................................... 158 STS.......................................... 158 SWR 103, 123, 127, 130, 147, 149, 150 TEST .......................................... 50 TOD.......................................... 158 TRX.............. 119, 126, 136, 139, 141 TX 67, 158 URL............................................. 1 V 18, 49, 56, 57, 125, 132, 133, 148 VGND ........................................ 100 VSWR ................................... 19, 130 ZXC10 .... 1, 3, xi, 16, 18, 21, 31, 61 Warning: This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Changes or modifications to this unit not expressly approved by the party responsible for compliance will void the user’s authority to operate the equipment. Any change to the equipment will void FCC grant. This equipment has been tested and found to comply with the limits for a Class B digital device,pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: --Reorient or relocate the receiving antenna. --Increase the separation between the equipment and receiver. --Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. --Consult the dealer or an experienced radio/TV technician for help. The equipment compliance with FCC radiation exposure limit set forth for uncontrolled Environment