S SMD ion an stallati DR-NH nd Ope H124 4 n Manual eration Ins V6.0 Release May. 22, Kyung Eu R&D Divi Youngsh 1 2012 un Han ision Team 3 in Yeo 3 eference:
Doc Versi Docu Issue Autho Depa Autho ument Re on:
ument Status s:
e Date:
or:
artment:
orizing Mana ager:
Confi idential & Pro oprietary 1/139 REVISION HISTORY Version Issue Date No. of Pages V 1.0 V 2.0 V 3.0 V 4.0 V 5.0 V 6.0 Jan. 02, 2009 Oct. 23. 2009 Feb. 04. 2010 Nov. 24. 2010 Feb. 21, 2011 May. 22, 2012 Initials Details of Revision Changes Original Add RDU(VHF+UHF) Add ADD ON V/UHF ROU Add RDU E-VHF+UHF LTE FULL BAND Add 700LTEF+850C Technical Support SOLiD serial numbers must be available to authorize technical support and/or to establish a return authorization for defective units. The serial numbers are located on the back of the unit, as well as on the box in which they were delivered. Additional support information may be obtained by accessing the SOLiD Tehcnology, Inc. website at www.st.co.kr or send email at sjkim@st.co.kr This manual is produced by Global Business Division Business Team 1. Printed in Korea. Confidential & Proprietary 2/139 Contents Section1 Safety & Certification Notice ................................................................... 9 Section2 System Overview ................................................................................... 12 2.1 General overview ......................................................................................... 13 2.2 System overview .......................................................................................... 14 Section3 System Specifications ........................................................................... 16 3.1 System specifications ................................................................................. 17 3.1.1 Physical Specifications ......................................................................... 17 3.1.2 Optic wavelength and Laser power ...................................................... 18 3.1.3 Environmental specifications ............................................................... 18 3.1.4 Operating Frequencies range ............................................................... 18 3.1.5 Specifications Per band ........................................................................ 19 Section4 System Configuration and Functions .................................................. 24 4.1 BIU (BTS Interface Unit) .............................................................................. 25 4.1.1 Specifications of BIU ............................................................................. 25 4.1.2 Block diagram of BIU............................................................................. 26 4.1.3 BIU parts ................................................................................................. 26 4.1.4 Function by unit ..................................................................................... 27 4.1.5 Front/rear panels of BIU ........................................................................ 32 4.2 ODU (Optic distribution Unit) ...................................................................... 35 4.2.1 Specifications of ODU ........................................................................... 35 4.2.2 Block Diagram of ODU .......................................................................... 36 4.2.3 ODU parts ............................................................................................... 36 4.2.4 Function by unit ..................................................................................... 37 Front/rear panels of ODU ...................................................................... 38 4.2.5 4.2.6 Interface with BIU .................................................................................. 39 4.3 OEU (Optic Expansion Unit) ....................................................................... 40 4.3.1 Specifications of OEU ........................................................................... 41 4.3.2 Block Diagram of OEU........................................................................... 41 4.3.3 OEU parts ............................................................................................... 42 Function by unit ..................................................................................... 43 4.3.4 4.3.5 Front/rear panels of OEU ...................................................................... 46 4.4 ROU (Remote Optic Unit) ............................................................................ 47 Confidential & Proprietary 3/139 4.4.1 Specifications of ROU ........................................................................... 47 4.4.2 Block Diagram of ROU .......................................................................... 48 4.4.3 ROU parts ............................................................................................... 48 4.4.4 Function by unit ..................................................................................... 50 4.4.5 Bottom of ROU ....................................................................................... 57 4.5 Add on V/UHF ROU ...................................................................................... 59 4.5.1 Specifications of AOR ........................................................................... 59 4.5.2 Block Diagram of AOR .......................................................................... 60 4.5.3 AOR parts ............................................................................................... 61 4.5.4 Function by unit ..................................................................................... 62 4.5.5 Rear of AOR ............................................................................................ 65 Section5 System Installation & Operation ........................................................... 68 5.1 BIU Installation ............................................................................................. 69 5.1.1 BIU Shelf Installation ............................................................................. 69 5.1.2 BIU Power Cabling ................................................................................. 70 5.1.3 RF Interface at BIU ................................................................................. 71 5.1.4 MDBU insertion ...................................................................................... 77 5.1.5 ODU Interface ......................................................................................... 78 5.1.6 Consumption Power of BIU .................................................................. 79 5.2 ODU Installation ........................................................................................... 80 5.2.1 ODU Shelf Installation ........................................................................... 80 5.2.2 ODU Power Cabling ............................................................................... 80 5.2.3 ODU Optic Cabling................................................................................. 81 5.2.4 Insert DOU to ODU ................................................................................. 81 5.2.5 Consumption Power of ODU ................................................................. 82 5.3 ROU Installation ........................................................................................... 83 5.3.1 ROU Enclosure installation ................................................................... 83 5.3.2 ROU Power Cabling ............................................................................... 87 5.3.3 Optical Cabling ...................................................................................... 88 5.3.4 GND Terminal Connection .................................................................... 89 5.3.5 Coaxial cable and Antenna Connection .............................................. 90 5.3.6 Insertion of RDU..................................................................................... 90 5.3.7 Consumption of RDU ........................................................................... 101 5.4 OEU Installation ......................................................................................... 103 5.4.1 OEU Shelf installation ......................................................................... 103 5.4.2 OEU Power Cabling ............................................................................. 103 Confidential & Proprietary 4/139 5.4.3 OEU Optic Cabling ............................................................................... 104 5.4.4 Insert DOU to OEU ............................................................................... 105 5.4.5 Consumption Power of OEU ............................................................... 105 5.5 ADD ON V/UHF ROU Installation .............................................................. 106 5.5.1 AOR Enclosure installation ................................................................. 106 5.5.2 AOR Power Cabling ............................................................................. 110 5.5.3 GND Terminal Connection ................................................................... 111 5.5.4 Coaxial cable and Antenna Connection ............................................ 112 5.5.5 Consumption Power of AOR ............................................................... 112 5.5.6 Interface with existing ROU ................................................................ 113 Section6 Operation .............................................................................................. 115 6.1 BIU Operation ............................................................................................. 116 6.1.1 BIU ......................................................................................................... 116 6.1.2 TX Operation at BIU ............................................................................. 116 6.1.3 RX Operation at BIU............................................................................. 120 6.1.4 Setting whether to use ROU/OEU at BIU ........................................... 120 6.1.5 ODU Operation at BIU.......................................................................... 122 6.2 ROU Operation ........................................................................................... 124 6.2.1 ROU Operation ..................................................................................... 124 6.3 OEU Operation ........................................................................................... 130 6.3.1 OEU Operation ..................................................................................... 130 Section7 Additive functions................................................................................ 135 7.1 Shutdown function (TX output shutdown) .............................................. 136 7.2 Total Power Limit function (TX Output ALC) ........................................... 136 7.3 Output power automatic setting function (TX Output AGC) .................. 136 7.4 Input power AGC function (TX Input AGC) .............................................. 137 7.5 Input power limit function (TX Input ALC) ............................................... 138 7.6 Optic loss compensation .......................................................................... 138 Confidential & Proprietary 5/139 Contents of Figure Figure 2.1 Basic system topology ............................................................... 14 Figure 2.2 Expansion system topology ....................................................... 15 Figure 4.1 BIU outer view ............................................................................ 25 Figure 4.2 BIU mounting diagram ............................................................... 26 Figure 4.3 MDBU Outer Look ...................................................................... 30 Figure 4.4 MDBU Outer Look ...................................................................... 30 Figure 4.5 MCPU Outer Look ...................................................................... 31 Figure 4.6 MPSU Outer Look ...................................................................... 32 Figure 4.7 BIU front panel Outer Look ........................................................ 33 Figure 4.8 Rear panel Outer Look ............................................................... 34 Figure 4.9 ODU Outer Look ........................................................................ 35 Figure 4.10 ODU Inner Look ....................................................................... 36 Figure 4.11 MDBU Outer Look .................................................................... 37 Figure 4.12 2Way Divider Outer Look ......................................................... 38 Figure 4.13 ODU front panel Outer Look .................................................... 38 Figure 4.14 ODU Rear panel Outer Look .................................................... 39 Figure 4.15 Interface between BIU and ODU .............................................. 39 Figure 4.16 OEU Outer Look ....................................................................... 41 Figure 4.17 OEU Inner Look ....................................................................... 42 Figure 4.18 MDBU Outer Look .................................................................... 43 Figure 4.19 EWDM Outer Look ................................................................... 44 Figure 4.20 ECPU Outer Look .................................................................... 44 Figure 4.21 ERFM Outer Look .................................................................... 45 Confidential & Proprietary 6/139 Figure 4.22 ERFM Outer Look .................................................................... 45 Figure 4.23 OEU front panel Outer Look ..................................................... 46 Figure 4.24 Rear panel Outer Look ............................................................. 46 Figure 4.25 ROU Outer Look ...................................................................... 47 Figure 4.26 ROU Inner Look ....................................................................... 48 Figure 4.27 RDU Outer Look ....................................................................... 52 Figure 4.28 R OPTIC Outer Look ................................................................ 55 Figure 4.29 RCPU Outer Look .................................................................... 55 Figure 4.30 Multiplexer Outer Look ............................................................. 56 Figure 4.31 ROU Bottom Look .................................................................... 57 Figure 4.32 AOR Outer Looks ..................................................................... 59 Figure 4.33 AOR Inner Look ........................................................................ 61 Figure 4.34 RDU Outer Look ....................................................................... 64 Figure 4.35 AOR Rear Look ........................................................................ 66 Figure 5.1 RACK Installation ....................................................................... 69 Figure 5.2 800PS BDA Interface using Circulator ....................................... 75 Figure 5.3 800PS BDA Interface using Duplexer ........................................ 76 Figure 5.4 Optical cable of SC/ACP Type ................................................... 81 Figure 5.5 How to install ROU ..................................................................... 83 Figure 5.6 Dimension used to install ROU on the WALL ............................. 84 Figure 5.7 Optical cable of SC/ACP Type ................................................. 104 Figure 5.8 How to install AOR ................................................................... 106 Figure 5.9 Dimension used to install AOR on the WALL ........................... 107 Figure 5.10 Installation flow diagram when AOR installs on wall .............. 108 Confidential & Proprietary 7/139 Figure 5.10 Installation flow diagram when AOR installs in the rack ......... 109 Figure 5.10 AOR which is installed above of ROU .................................... 113 Figure 5.11 AOR which is installed under of ROU ..................................... 114 Confidential & Proprietary 8/139 Section1 Safety & Certification Notice Confidential & Proprietary 9/139 Only qualified personnel are allowed to handle this unit. Read and obey all the warning labels attached in this user manual Any personnel involved in installation, operation or service of the SOLiD Technology repeaters must understand and obey the following:
- Obey all general and regional installation and safety regulations relating to work on high voltage installations, as well as regulations covering correct use of tools and personal protective equipment.
- The power supply unit in repeaters contains dangerous voltage level, which can cause electric shock. Switch the mains off prior to any work in such a repeater. Any local regulations are to be followed when servicing repeaters.
- The repeater cover should be (door) securely fastened in open position, e.g. by tying it up, at outdoor work in order to prevent door from slamming due to wind causing bodily harm or damage.
- Use this unit only for the purpose specified by the manufacturer. Do not carry out any modifications or fit any spare parts which are not sold or recommended by the manufacturer. This could cause fires, electric shock or other injuries.
- Any repeater, including this repeater, will generate radio signals and thereby give rise to electromagnetic fields that may be hazardous to the health of any person who is extensively exposed to the signals at the immediate proximity of the repeater and the repeater antennas.
- Due to power dissipation, repeater may reach a very high temperature. Do not operate this unit on or close to flammable materials.
- Do not use any solvents, chemicals, or cleaning solutions containing alcohol, ammonia, or abrasives.
- Certification
FCC: This equipment complies with the applicable sections of Title 47 CFR Parts 15,22,24 and 90
UL/CUL: This equipment complies with UL and CUL 1950-1 Standard for safety for information technology equipment,including electrical business equipment
FDA/CDRH: This equipment uses a Class 1 LASER according to FDA/CDRH Rules.This product conforms to all applicable standards of 21 CFR Chapter 1, Subchaper J, Part 1040 Confidential & Proprietary 10/139
-For PLUGGABLE EQUIPMENT, the socket-outlet shall be installed near the equipment and shall be easily accessible. Confidential & Proprietary 11/139 Section2 System Overview 2.1 General overview 2.2 System overview Confidential & Proprietary 12/139 2.1 General overview SMDR-NH124 is a coverage system for in-building services delivering voice and data in high quality and for seamlessly. As a distributed antenna system, it provides analog and digital phone systems that are served in multiple bands through one antenna. The system covers general public institutions and private facilities.
Shopping malls
Hotels
Campus areas
Airports
Clinics
Subways
Multi-use stadiums, convention centers, etc. The system helps improve in-building radio environments in poor condition and make better poor RSSI and Ec/Io. By providing communication services at every corner of buildings, the system enables users to make a call at any site of buildings. The system uses both analog (AMPS) and digital (TDMA, CDMA and WCDMA) methods. The SMDR-NH124 system supports communication standards and public interface protocols in worldwide use.
Frequencies: VHF,UHF, 700MHz, 800MHz,850MHz 900MHz,1900MHz,2100MHz, etc.
Voice protocols: AMPS,TDMA, CDMA,GSM,IDEN, etc.
Data protocols: EDGE,GPRS,WCDMA,CDMA2000,Paging, etc. SMDR-NH124 is in modular structure per frequency. To provide desired frequency in a building, all you need to do is to insert a corresponding frequency module into each unit. As it delivers multiple signals with one optical cable, the system, in one-body type, does not require additional facilities whenever new frequency is added. The system is featured with the following:
Flexibiltiy & Scalabiltiy
Support fiber-optic ports up to 39
Clustering multiple-buildings (campus) as one coverage Modular structures
Modular frequency upgrade
Plug-in type module
Multi-Band, Multi Operator Confidential & Proprietary 13/139
Sign
Sup
Low OP
Com
Upg
Eas
Web lurality of se nals with a p perator in a b pport multi-op X EX / CAPEX n mpact design gradable des sign n and mainte sy installation b Based SNM MP or GSM er transmit si multaneousl ly rvice provide band enance Modem or U UDP support
(Optional) 2.2 System o overview SMD Basic ROU R-NH124 is cally, the sys
(Remote Op composed o stem consist ptic Unit). Fo of devices giv ts of BIU (BT or addition of ven below. TS Interfcac more ROUs e Unit), ODU s, it has OEU U (Optic dist U (Optic Expa tribution Uni ansion Unit). t) and F Figure 2.1 Basic syste em topology y 14/139 9 Confi idential & Pro oprietary Fig gure 2.2 Ex xpansion sy ystem topolo ogy System topo Opt ology Charts tical Loss [d dBo]
Sys BIU O BIU O BIU 4O 4ODU(DO stem elemen ODU(DOUx1) ODU(DOUx2) ODU(DOUx2 OUx2)-4OEU Table 3.1 nts
) ROU
) ROU 2) ROU
(DOUx2) R ROU BIU 1~5dBo 1~5dBo 1~5dBo 1~5dBo Confi idential & Pro oprietary 15/139 9 Max. RUs s 4 8 32 60 Section3 System Specifications 3.1 System specifications 3.1.1 Physical Specifications 3.1.2 Optic wavelength and Laser power 3.1.3 Environmental specifications 3.1.4 Operating Frequencies range 3.1.5 Specifications Per band Confidential & Proprietary 16/139 Interface Serial connector 1 RS-232 9-pin D-
sub, male 1 RS-232 9-pin D-sub, male 1 RS-232 9-pin D-sub, male Fiber connector
8pcs, SC/APC for ROU 1 SC/APC for ODU 3.1 System specifications 3.1.1 Physical Specifications Parameter BIU RF Connectors Alarm External connector
(Dry contacts) 4 SMA type, female
(Per MDBU) Terminal block,3pcs
ODU SMA 2 female type, On MDBU Status
Power status ALM status
MCPU
On Power status TX Communicatio n RX Communicatio n ALM status On Power status DC ALM status
MPSU
Normal range: -48 VDC Operating range:
-40.8 ~ -57.6VDC 168W
(Including 4EA) 482.6(19) 221.5(5U) x 450 22.25Kg ODU x DOU1 Status
LD status PD1/2/3/4 status DOU2 Status
LD status PD1/2/3/4 status
LED Alarm and Status Indicator
AC Power DC Power Power consumption Enclosure Dimensions Weight[Full Load]
OEU ROU AOR 1N-type,female 2 SMA Type female
1 SC/APC for ODU 8 SC/APC for ROU EWDM Status LD status
PD status DOU1 Status
LD status PD1/2/3/4 status DOU2 Status
LD status PD1/2/3/4 status System status
on Power status TX Communicatio n RX Communicatio n
System status
Power on status TX1 Communication RX1 Communication TX2 Communication RX2 Communication ALM status Range:
Normal 120VAC 50/60Hz Operating range 108~132VAC,50/60Hz Normal: -48 VDC Operating range:
-40.8 ~ -57.6VDC
Same side left Same to left side 78W
(VHF/UHF RDU) 482.6(19) x 258 x 177 11Kg 48W
(Including DOU2EA) 265W
(Including RDU 3EA) x 482.6(19) 43.6(1U) x 450 5.7Kg 482.6(19) x 88.1(2U) x 450 9.3Kg 420 x 530 x 258 35.45Kg Confidential & Proprietary 17/139 3.1.2 Optic wavelength and Laser power Parameter ODU OEU ROU West optic Wavelength TX: 1310nm RX: 1550nm TX: 1550nm, RX: 1310nm TX: 1550nm East optic RX: 1310nm TX: 1310nm, RX: 1550nm 3dBm1dBm to ROU 7dBm1dBm to ODU 7dBm1dBm to ODU Output power 3dBm1dBm to ROU,OEU 3.1.3 Environmental specifications Parameter BIU, ODU, OEU ROU/AOR Operating Temperature
-10 to +50C Operating Humidity, non condensing
-10 to +50C 5% to 90%
3.1.4 Operating Frequencies range Standard Unit naming Description iDEN iDEN Cellular Iden Paging PCS AWS-1
700P 800P 850C 900I+PA 900 PA 1900P AWS-1 VHF UHF Frequency range TX(MHz) RX(MHz) 764 to 776 851 to 869 869 to 894 929 to 941 929 to 930 794 to 806 806 to 824 824 to 849 896 to 902 896 to 902 1930 to 1995 1850 to 1915 2110 to 2155 1710 to 1755 Public safety Public safety Cellular SMR+
Paging PCS AWS-1 Public safety 136 to 174 136 to 174 Public safety(Band1) Public safety(Band2) 396 to 450 450 to 512 380 to 434 434 to 496 396 to 450 450 to 512 380 to 434 434 to 496 698 to 716 777 to 787 LTE 700LTE Long Term Evolution 728 to 757 Confidential & Proprietary 18/139 3.1.5 Specifications Per band 700MHz Long Term Evolution Parameters Typical TX RX Bandwidth 29MHz 28MHz Remarks RX(MHz): 698~716 777~787 5dB 5dB
-20 to +10dBm
-50dBm
+30dBm 43dB
+0dBm 50dB 18 to 43dB 30 to 50dB
-13dBm
+23dBm 15dB Total 1ROU Typical TX RX 12MHz 5dB 12MHz 5dB
-20 to +10dBm
-50dBm
+23dBm 43dB
+0dBm 50dB 18 to 43dB 30 to 50dB
-13dBm
+23dBm 15dB Remarks Total 1ROU System ripple Input Power level Output power System Gain Gain Control range IM3 IP3 Noise figure 700MHz Public safety Parameters Bandwidth System ripple Input Power level Output power System Gain Gain Control range IM3 IP3 Noise figure Confidential & Proprietary 19/139 Typical TX RX 18MHz 5dB 18MHz 5dB
-20 to +10dBm
-50dBm
+30dBm 43dB
+0dBm 50dB 18 to 43dB 30 to 50dB
-13dBm
+23dBm 15dB Typical TX RX 25MHz 5dB 25MHz 5dB
-20 to +10dBm
-50dBm
+30dBm 43dB
+0dBm 50dB 18 to 43dB 30 to 50dB
-13dBm
+23dBm 15dB Remarks Total 1ROU Remarks Total 1ROU 800MHz Public safety Parameters Bandwidth System ripple Input Power level Output power System Gain Gain Control range IM3 IP3 Noise figure 850MHz Cellular Parameters Bandwidth System ripple Input Power level Output power System Gain Gain Control range IM3 IP3 Noise figure Confidential & Proprietary 20/139 Typical TX RX 12MHz 5dB 6MHz 5dB
-20 to +10dBm
-50dBm
+30dBm 43dB
+0dBm 50dB 18 to 43dB 30 to 50dB
-13dBm
+23dBm 15dB Typical TX RX 65MHz 5dB 65MHz 5dB
-20 to +10dBm
-50dBm
+30dBm 50dB
+0dBm 50dB 25 to 50dB 30 to 50dB
-13dBm
+23dBm 15dB Remarks Total 1ROU Remarks Total 1ROU 900MHz iDEN & Paging Parameters Bandwidth System ripple Input Power level Output power System Gain Gain Control range IM3 IP3 Noise figure 1900MHz PCS Parameters Bandwidth System ripple Input Power level Output power System Gain Gain Control range IM3 IP3 Noise figure Confidential & Proprietary 21/139 Typical TX RX 45MHz 5dB 45MHz 5dB
-20 to +10dBm
-50dBm
+30dBm 50dB
+0dBm 50dB 25 to 50dB 30 to 50dB
-13dBm
+23dBm 15dB Typical TX RX 38MHz 5dB 38MHz 5dB
-15 to +10dBm
-54dBm
+24dBm 39dB
-4dBm 50dB 14 to 39dB 30 to 50dB
-13dBm
+23dBm 7dB Remarks Total 1ROU Remarks 136~174MHz Total 1ROU 1700MHz&2100MHz AWS-1 Parameters Bandwidth System ripple Input Power level Output power System Gain Gain Control range IM3 IP3 Noise figure 150MHz VHF Public safety Parameters Bandwidth System ripple Input Power level Output power System Gain Gain Control range IM3 IP3 Noise figure Confidential & Proprietary 22/139 450MHz UHF Public safety Parameters Typical TX RX Remarks 396~450MHz(54MHz) Bandwidth(Band1) 116MHz 116MHz 450~512MHz(62MHz) Band selection 380~434MHz(54MHz) Bandwidth(Band2) 116MHz 116MHz 434~496MHz(62MHz) Band selection 5dB 5dB
-15 to +10dBm
-54dBm
+24dBm 39dB
-4dBm 50dB 14 to 39dB 30 to 50dB
-13dBm
+23dBm 7dB Total 1ROU System ripple Input Power level Output power System Gain Gain Control range IM3 IP3 Noise figure Confidential & Proprietary 23/139 Section4 System Configuration and Functions 4.1 BIU (BTS Interface Unit) 4.2 ODU (Optic distribution Unit) 4.3 OEU (Optic Expansion Unit 4.4 ROU (Remote Optic Unit) 4.5 AOR (Add on V/UHF ROU) Confidential & Proprietary 24/139 4.1 BIU (BTS S Interface e Unit) BIU unit s provides TX separates R X signals fro RX signals g om BTS or given from O BDA for fo ODUs from ur ODUs (O each other Optic Distrib r per freque bution Unit) ency band. This Figure 4 4.1 BIU ou uter view 4.1.1 1 Specifica ations of BI U Item Size t Weight Po ower consum mption 482.6(
Spec. 5(5U) x 450
(19) x 221.5 22.35 Kg g 168 W Remark Mm Full Load Confi idential & Pro oprietary 25/139 9 4.1.2 2 Block dia agram of BI IU 4.1.3 3 BIU parts s Figure 4.2 BIU mount ting diagram m No. Unit 1 MDBU Descri ption Main Dr Amplify Amplify nit rive BTS Un wnlink RF sig gnal
& adjust dow al
& adjust upli ink RF signa Re mark Max x 4EA Confi idential & Pro oprietary 26/139 9 2 MCDU 3 MCPU Main Com/Div Unit Combine 4EA downlink signal and divide 4EA signal to ODU Combine 4EA uplink signal and divide 4EA signal to MDBU Support VHF/UHF interface port Main Central Processor Unit Control and monitoring system status Control and monitoring with RS232 Have an access to upper-level network through GSM or Ethernet 4 MPSU Main Power Supply Unit Input power: DC -48V, Output power: 9V, 6V 5 M/B Mother Board Provide signal interface and power for each unit Provide three ports for dry contact 6 Shelf 19 inch, 5U 4.1.4 Function by unit 4 Main Drive BTS Unit (MDBU) MDBU delivers TX signals of BTS or BDA to related devices and then delivers RX signals of the devices to BTS or BDA. This unit can monitor TX input level. Using input AGC function, it automatically adjusts input ATT. It also has ATT to adjust RX gain. MDBU is varied per frequency band including the following:
No Unit naming Description In/out RF Port TX RX 1 2 3 4 5 6 7 800PS 850C 1900P AWS-1 800PS+900I+PA 850C+700PS 850C+700LTEC Single Band Single Band Single Band Single Band Dual Band Dual Band Dual Band 2 Port 2 Port 4 Port 4 Port 4 Port 4 Port 4 Port 2 Port 2 Port 4 Port 4 Port 4 Port 4 Port 4 Port Confidential & Proprietary 27/139