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1 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
Nokia UltraSite MastHead Amplifier SYSTEMs
Jouni Pelkonen
PE Project ManagerDelivery OperationsNokia Networks
2 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
CONTENT
•Backround for MHA
•UltraSite BTS sensitivity and Rx level reporting
•MHA main parts and features
•MHA power feed and gain control
•Installation and installation verification
•MHA Reliability
3 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
Backround for MHA
4 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
Benefits of Nokia MHA• Increase coverage (50…100%)• Balance Rx-Tx link in case of uplink limitation• Improve system sensitivity• Decrease mobile transmitted power• MHA and Bias Tee interfaces smoothly with Nokia BTS's
=> no extra PDU's or complicated cable sets needed=> type approved with Nokia BTS, to meet GSM specs (in
terms of blocking, intermodulation and sensitivity)
BTS RX w/o MHA BTS RX with MHA
BTS TX
5 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
What is noise? (2)What is noise? (2)
• Dependent on the receivers bandwidth, a certain level of noise can be captured. This noise is subsequently referred to as the thermal "noise floor" of the receiver
• As an example, what is the thermal noise floor expressed in dBm in a GSM system at a temperature of +17 deg. Celcius, and a receiver demodulator bandwidth of 271 kHz ?
Solution:
271000]290101.3810log[1000N 23GSM ××××= −
NGSM = -119.6 dBm
Note: Thermal Noise Floor is the noisefloor without TX or RX non-idealities
6 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
Facts/Formula Overview (1)
• System Sensistivity - The minimum usable signal level at the input of the system. This level must exceed the noise floor by the required carrier to noise ratio (C/N)
• Noise Figure for Amplifiers - Amplifiers generate additional noise relatively to the noise floor. The noise at the output of an amplifier with a noise factor F and a gain G is defined by
dBdBdBmdBmsystem NCFBkTP system ))/(()()()( min1 ++=
)()( 1BFGkTN linearamp =
)1000log(10)( 1BFGkTN dBmamp ×=
7 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
Facts/Formula Overview (2)
• System Noise Factor - When cascading matchedmatched amplifiers/attenuators a resulting system noise factor will be generated according to Friis formula. It can be seen that the most dominant factors in the formula is the noise factor and gain of the first amplifier/attenuator in the cascade --> F1 and G1:
21
3
1
21
11GG
FGFFFsystem
−+
−+=
Note 1. In Friis formula Noise factors and Gainsare linear values and not dB values
Noise factor = linearNoise figure = dB
Note 2. Conversion from dB values to linears are done according to:x (dB) = 10x/10 (linear)
8 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
Implementation Overview 1
HypotheticalGeneral Case
Noise FactorF1
Noise FactorF2
System Input
Gain = G1
1st
Amplifier Stage
Gain = G2
2nd
amplifier stage
Resulting Noise Factor - Fsystem
Noise FactorFn
Gain = Gn
nth
subsequent amplifier stage
The system noise factor for this implementation can be derived using Friis formula:Here we note that the stage 3 quotient F3-1/G1G2=0
211
21)(
11GG
FGFFF n
linearsystem−
+−
+=1
21)(
1GFFF linearsystem
−+=-->
9 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
Implementation Overview 2Feeder Base Station
Without MHA Noise Factor - F1 Noise FactorF2
Receiving Antenna
Feeder Loss = LGain G1= 1/L
Gain = G2
Resulting Noise Factor - Fsystem
The system noise factor for this implementation can be derived using Friis formula:Here we note that the stage 3 quotient F3-1/G1G2=0 and that the feeder loss iseqvivalent to the feeder noise factor, hence L=F1-->G1=1/F1
21
3
1
21)(
11GG
FGFFF linearsystem
−+
−+=
1
21)(
/11F
FFF linearsystem−
+=-->
1121)( FFFFF linearsystem −×+= -->12)( FFF linearsystem ×=
)log(10)log(10 12)( FFF dBsystem +=
10 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
Implementation Overview 3
With MHA Noise Factor - F1 Noise FactorF3
Receiving Antenna
Gain= G1 Gain = G3
Resulting Noise Factor - Fsystem
MHA Feeder + Base Station
Noise Factor - F2
Feeder Loss = LGain G2= 1/L
The system noise factor for this implementation can be derived using Friis formula:We include the stage 3 quotient F3-1/G1G2 and note this time that L=F2 and henceG2=1/F2
21
3
1
21)(
11GG
FGFFF linearsystem
−+
−+=
2/1
3
1
21)(
111FG
FGFFF linearsystem
×
−+
−+=-->
]1[12232
1
1)( FFFFG
FF linearsystem −×+−+= ]1[123
1
1)( −×+= FFG
FF linearsystem-->
]1log[1011
231)(
GGFFFF dBsystem −
×+=
11 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
MHA - A Dramatic System Improvement, Example 3 - WCDMA
Feeder + System SensitivityConnector Loss System NF System Sensitivity System NF System Sensitivity Improvement
(dB) (dB) (dBm) (dB) (dBm) (dB)0 3 -99.0 2.17 -99.8 0.81 4 -98.0 2.25 -99.7 1.72 5 -97.0 2.36 -99.6 2.63 6 -96.0 2.49 -99.5 3.54 7 -95.0 2.64 -99.3 4.45 8 -94.0 2.83 -99.2 5.26 9 -93.0 3.06 -98.9 5.97 10 -92.0 3.33 -98.7 6.78 11 -91.0 3.65 -98.3 7.49 12 -90.0 4.02 -98.0 8.0
10 13 -89.0 4.44 -97.5 8.6
Without an MHA With an MHA
Assumptions:- BS NF is 3 dB- BS Demod BW is 5000 KHz- MHA NF is 2 dB- MHA Gain is 12dB- Digital Detection Threshold is 5 dB (Eb/No)- Temperature 17ºC = 290 K- Processing gain will improve the sensitivity additionally (e.g. 25 dB for Voice as an example)
HALF the System Noise Factor
DOUBLE the System Sensitivity
12 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
Nokia UltraSite EDGE BTSRF Performance
• BTS Receiver Sensitivity
Minimum BTS sensitivity value measured at BTS antenna connector (without MHA) or at MHA input connector when MHA is used.
BTS sensitivity value with MHA is with high gain mast head amplifier especially designed for UltraSite BTS. Maximum feeder loss can be 7 dB in GSM900 and 10 dB in GSM1800/1900.
Note that there is no full-band MHA1800 available.
13 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
UltraSite BTS sensitivity and Rx level reporting
14 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
UltraSite EDGE RX chain with/without MHA
ANTENNA
UltraSite EDGE BTS
High gain: +29,4dB(GSM1800)
DVxx/RTxx
TRX
Low Gain: -3.6dB...+6.4dB(GSM1800)
DVxx/RTxx
• UltraSite EDGE filter unit (DVxx/RTxx) has two gain settings:
High gain (fixed): Without MHALow gain (variable): With MHA
• When using UltraSite GSM/EDGE MHA, feeder loss information is inputted withthe HW configurator. Based on this data, needed RX chain gain is determined and filter unit variable gain is set accordinglyto provide optimal performance.UltraSite EDGE BTS
TRX
FEEDERCABLE
ANTENNA
FEEDERCABLE
MHA: 33dB
15 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
RX level reporting in UltraSite EDGE and TalkWithout MHA
Ultra-Site EDGEBTS
FEEDERCABLE: 3dB
ANTENNA
-90dBm
ReportedRX level: -93dBm
• UltraSite EDGE and Talk:Received signal level of the BTS is measured in the TRX. From this
measurement value, reported RX level is calculated such way that it shows RX level at the BTS antenna port (top of cabinet).
It is noted that the signal received by the antenna is attenuated by the amount of the antenna feeder loss.
TalkBTS
FEEDERCABLE: 3dB
ANTENNA
-90dBm
ReportedRX level: -93dBm
RX level reporting point
RX level reporting point
16 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
RX level reporting in UltraSite EDGE and TalkWith MHA
FEEDERCABLE: 3dB
RX level reporting point
ANTENNA
Ultra-Site EDGEBTS
FEEDERCABLE: 3dB
MHA: 33dB
ANTENNA-90dBm -90dBm
ReportedRX level: -90dBm
MHA: 12dBReportedRX level: -81dBm
RX level reporting point Talk
BTS
Talk:• RX level is reported at the BTS
antenna connector the same way as without MHA
Ultrasite EDGE:• RX level is reported at the input of
the MHA. Since antenna feeder loss information is fed to the BTS HWconfigurator, RX level reporting shows correct received signal value at the antenna
17 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
RX level reporting in UltraSite EDGE and Talk
• Note: Talk family BTS always reports RX level at BTS antenna connector and therefore addition of MHA is seen as an increase of RX level. With UltraSite EDGE, addition of MHA does no change RX level reporting values that much, since reporting reference point is at MHA input when it is used.
• Example:
• Change in RX level reporting, when adding a MHA, however, does not mean that system sensitivity would increase the same amount.
-81dBm-90dBmWith MHA-93dBm-93dBmWithout MHA
TalkUltraSite EDGEReported RX levelPin,ant=-90dBm
Feeder loss=3dB
18 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
System sensitivity without MHA
• Definition of system sensitivity: Receiver input power level, at which specified bit error rate (BER) is achieved in
a defined reference point• GSM spec defines sensitivity to be measured at BER=2%• Reference point for system sensitivity = Antenna• BTS sensitivity without MHA is typically specified at the BTS antenna connector• System sensitivity w/o MHA = ( BTS sensitivity ) – ( antenna feeder cable losses )
BTS sensitivity w/o MHA is specifiedat BTS antenna connector
ANTENNA
FEEDERCABLE
Reference point for system sensitivity
BTS
19 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
System sensitivity with MHA
• Degradation of system sensitivity due to feeder cable losses can be compensated by using a MHA
• Specification of BTS sensitivity with MHA may vary from product to product:
Talk: BTS sensitivity is only specified at BTS antenna connector, affect of MHA must be calculated separately
UltraSite: When using a MHA, BTS sensitivity is specified at MHA input and separate sensitivity figures with MHA can be found from product documentation
20 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
System sensitivity with MHA• System sensitivity:
Talk: Calculated from BTS and MHA noise figure + feeder loss, see table on next page. Sensitivity is a function of feeder cable loss.
UltraSite: System sensitivity = UltraSitesensitivity specification with MHA (see product documentation). Note that sensitivity remains constant regardless of the feeder loss !
Talk BTS sensitivity is only specifiedat BTS antenna connector
BTS
FEEDERCABLE
ANTENNA
MHA
UltraSite BTS sensitivity withMHA is specified at MHA input
21 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
System sensitivity with MHA
Antenna UltraSite EDGE system sensitivity (GSM1800) Talk system sensitivity (GSM1800)feeder Without With MHA Without With MHA
loss MHA MHA improvement MHA MHA improvementdB dBm dBm dB dBm dBm dB
0 -112 -112.5 0.5 -110 -111.7 1.71 -111 -112.5 1.5 -109 -111.6 2.62 -110 -112.5 2.5 -108 -111.5 3.53 -109 -112.5 3.5 -107 -111.4 4.44 -108 -112.5 4.5 -106 -111.2 5.25 -107 -112.5 5.5 -105 -110.9 5.96 -106 -112.5 6.5 -104 -110.7 6.77 -105 -112.5 7.5 -103 -110.4 7.48 -104 -112.5 8.5 -102 -110.0 8.09 -103 -112.5 9.5 -101 -109.6 8.610 -102 -112.5 10.5 -100 -109.1 9.1
Note: UltraSite system sensitivity remains constant regardless of feeder loss !!
22 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
Up/downlink balance without MHAUp/down linkbalance / dB
+38
Uplink limitedoutput power range • In the uplink limited
output power range, cell size is limited byBTS RX sensitivity resulting smaller RX coverage than TX
• This imbalance can be compensated by using a MHA
+6
+4
0
+2
-2
-4
+36 +40 +42 +44
WBC 4:1
WBC 2:1
RTC
Bypass
Output powerat BTS antenna connector / dBm
Uplink limited
Downlink limited
Bypass+SRC/IDD
UltraSite GSM/EDGE output power rangeper combining type
Assumptions (GSM900):BTS RX sensitivity (2-way div): -113,5dBmMobile RX sensitivity: -104dBmMobile output power: +30dBm
23 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
MHA main parts and features
24 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
Hi! I aman UltraSiteMHA1800…...
And I must be the famous
WCDMA Dual MHA...
And I must be the
famous
WCDMA Dual MHA...
25 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
Dual Duplex (Nokia uses only this!)
Bias Tee
Antenna Port
BTS Port& DC Feed
LNABypassSwitch(notavailable in Ultra)
Tx
Rx
Rx
DuplexFilter
DuplexFilter
26 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
MHA main parts
• dual low noise AMPLIFIERS in 2…3 staged and balanced design.
• high Q dual DUPLEX FILTERS with integrated transmit filters.
• LIGHTNING PROTECTION circuitry at BTS port (DC short at antenna port).
• CURRENT EXTRACTION circuitry at BTS port for DC feed via feeder.
• SUPERVISION CIRCUITRY (monitors the status of the amplifiers and sends an alarm signal to the BTS in case of an LNA failure).
• VENTED DESIGN for maintenance free operation (GoreTex, drainpipe etc.).
27 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
UltraSite EDGE MHA block diagram
TX FILTER
GAIN ADJUSTMENT
RX FILTER
RX FILTER
CURRENT SENSE CIRCUIT
BTS
DC CURRENT
ANTENNA
28 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
MHA current levels
UltraSite EDGE WCDMA
Normal operation, typical 500…600 mA 50-190 mA
Failure of one amplifier 800…900 mA (MHA Alarm) 230…295 mA
Failure of both amplifiers 800…900 mA (MHA Alarm) 230…295 mA
29 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
MHA Alarms• Alarm numbers UltraSite EDGE WCDMA
7606 TRX faulty 76537607 TRX degraded 7654
• Reported fault reasons
UltraSite EDGE:* Fault in VSWR antenna monitoring - caused by high VSWR of the antenna line or low Tx power in the BiasT* Fault in the chain between power unit and MHA- MHA is broken or there is a problem in the chain from power unit to the MHA
WCDMA:
* Cell operation degraded, Mast head amplifier fault* Cell faulty, Antenna connection fault
30 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
Bias Tee (with or w/o VSWR)• Functions: to feed power to MHA, to monitor VSWR, to provide lighting protection
BTS port ANT portDC block(capacitor)
RF choke (inductor)
Broadband detectorslevel comparatorsalarm-sense logic
Lightning protectionTranszorb fast-react
GDT long-cycle
Fwd. powercoupler
Rvrs. power coupler
DC pwr in
Alarm out
31 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
UltraSite EDGE Bias Tee equipment
32 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
Antenna Monitoring (VSWR)- Voltage Standing Wave Ratio (VSWR) monitoring is optional in Ultra Bias Tee.- at the moment VSWR monitoring can be performed only on antenna lines including Tx, on BCCH antennas. - Pure Rx diversity antenna (TCH) can not be monitored by VSWR -"Comparing RSSI Value" will do it in CX3 from BTS
- The fixed VSWR thresholds are as follows: VSWR 2.6 or lower: antenna operation OK
VSWR greater than 2.6: indicates antenna fault
- An alarm is generated in case of antenna fault when VSWR threshold exceeded. -> alarm raised in the O&M system and the affected TRXsturned off.
33 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
More about VSWR...
- VSWR is designed to detect major faults in antenna line, not tobe a high accuracy measurement feature- Note a big RL difference between the antenna line with MHA (e.g.15 dB) and without MHA (e.g. 20 dB)!- After BTS or sector reset the Bias Tees can automatically be 'placed' to pure Rx line by default
-> use "Preferred BCCH TRX" feature- 'Call drop rate' and 'Handover success rate' are still good features/ referencies to make sure antenna line is OK
34 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
MHA generationsSystem Bandwith Gain NF(dB) By-pass Connectors BiasTee
(MHz) switch
Talk family:MHA900 25/35 12dB adj. 2.3 yes On bottom BasicMHA1800 3x25/FB 12dB 1.8 yes Bottom/In-line ->>-MHA1900 3x20 12dB 1.8 yes - >> - ->>-
UltraSite:MHA900 35 32dB 2.5 no In-line Basic/VSWRMHA1800 2x45 33dB 1.9 no ->>- ->>-MHA1900 3x20/FB 33dB 1.8/2.2 no/yes ->>- ->>-
WCDMA 60 12dB 1.9 yes In-line Basic/VSWR
35 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
High gain or low gain MHA?
• UltraSite MHA includes practically all receiver gain.• with an MHA, the front end of BTS is passive power splitter, with loss only. • without an MHA, an LNA in BTS is used. • the gain of LNA can be chosen/adjusted so that UltraBTS accepts also a Talk MHA without
blocking or deterioration in sensitivity.
• Talk and WCDMA MHA:• fixed gain LNA continuously switched ON in the front end of BTS receiver, before receiving
multicoupler. • May overdrive if 33 dB MHA is installed before that.• these MHAs are only used to compensate for feeder loss.
• Differences:• if all the gain in MHA (high gain) -> 0.3–0.5 dB better (front end) noise figure and respectively
the better system sensitivity that is very stabile and can not be affected by any level of feeder loss.
• an MHA with low gain is a bit unexpensive because the amplification is done with one FET only and not with two serial FETs. Additionally an LNA with fixed gain in BTS is cheaper.
• Decision between these two solution has been done program by program.
36 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
MHA power feed and gain control
37 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
UltraSite EDGE BTS - MHA control principal
B O I P W S P W S
I2 C - B U S
C o m m o n S u b r a c k
+ 1 2 V
B IA S - T
M H A
6
P W S
6
1 2
6 6 6 6
A n te n n a c o n n e c to r s1 - 1 2
M H A D C c o n n e c to r s1 - 1 2
In te r f a c e M o d u le
V S W R a la r m in p u t s1 - 1 2
I2 C - B U S
B ia s - TIn te r f a c e M o d u le
1 2
M H A D C p o w e r ( 1 2 V )1 - 1 2
M H A P W R c o n n e c t o r
V S W R M O N P W R c o n n e c t o r
Base Operations and Interface unit
38 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
UltraSite EDGE BTS - The rules to use MHA output lines in PWS unit
# of PWS unit PWS location 1 PWS location 2 PWS location 3 (left most) (middle) (right most)
2 7-12 1-6 Not installed
2 1-6 Not installed 7-12
2 Not installed 7-12 1-6
3 1-6 Outputs OFF (Redundant) 7-12
If one PWS unit gets faulty or is removed from the cabinet then redundant unit will start immediately feeding unpopulated MHA output lines. If two PWS units are installed and the (1-6) PWS gets faulty, then the (7-12) PWS is switched to (1-6).
39 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
Gain setting in UltraSite EDGE BTS
1. Open Nokia BTS HW Configurator
2. Choose masthead amplifier type: MHA, MNxx, or None for each antenna
MHA -> Talk family MHAs (12dB)MNxx -> UltraSite MHA (33dB).
Note! If Talk MHA is chosen, the BTS/DVD gain will be fixed/high.
If UltraSite MNxx is chosen, the gain/attenuation of the BTS/DVD can still be adjusted between low and high (appr. -3.6 dB… +6.4 dB).
Either Cable Loss or Gain Settings value can be changed.
3. Operation and alarm current tresholds adjust accordingly
4. Finally, configuration must be sent to BTS for it to take effect
40 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
…gain setting in UltraSite EDGE BTS
41 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
…gain setting in UltraSite EDGE BTS
42 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
RX-chain gain UltraSite EDGE MHA -UltraSite EDGE BTS
ANTENNA
BTS
Detection
Feeder cable
TSDA
MH2ADVDB
MHA Gain: 33dB ±1dB
Gain: 0 ... -10 dB (Loss)
Gain -0.45dB (Loss) Gain-0.35dB(Loss)
Gain -0.2dB(Loss)
Mobile RF powerat antenna connector:
BTS RX-chain nominal gain is 30.5 dBDVDx high gain - MH2A - BTS Internal cables + TSDA = 30.5 dB
When Ultra MHA is used DVDx is set to Low gain. DVDx Low gain path isvariable. GSM 1800 DVDx Low gain can set between -3.6dB...+6.4dB.Adjustment range is 10 dB (GSM1800 and GSM1900).
Now feeder cable loss is also taken into account.MHA - Feeder cable + (or -) DVDx low gain - MH2A - BTS Internal cables+ TSDA = 30.5 dB
Example when feeder cable loss is -6 dB and MHA is used. DVDx Low gainis to +2.4dB.+33dB-6dB+2.4dB-8.3dB-1.0dB+10.4dB = 30.5 dB
Cable Cable Cable
High Gain: 29.4dB ±1.6 dBLow Gain: -3.6dB to +6.4dB
Gain: -8.3 dB ±0.5dB
Gain: 10.4 dB ±2,5dB
43 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
Installation and Installation Verification
44 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
MHA pole installation (MHA 900/1800 in pic.)
Metalbands
Draining pipepointingdownwards.
Pole
MHA
Groundingstud
45 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
MHA wall installation
46 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
Correct installation?
47 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
Correct installation?
48 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
Correct installation?
49 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
BTS/Bias Tee Interface module, UltraSiteEDGE
Power connectorsSMB female 12 pcs
DC Power Inputconnectors from BTS
VSWR Alm connectorVSWR alarm connectorsSMB male 12 pcs
50 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
51 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
Bias Tee Installation – Indoor, UltraSite EDGE
52 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
Bias Tee Installation – Outdoor, UltraSite EDGE(Note! Termination Plate to be used only in Outdoor cabinet with AC filter Unit.)
53 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
Bias Tee installation in Outdoor UltraSite EDGE BTS
54 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
Connecting jumpers to Bias Tees
55 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
Bias Tee Installation in WCDMA Optima Compact BTS
56 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
Bias Tee Installation in WCDMA Indoor Supreme BTS
57 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
Bias Tee Installation in Ultrasite (WCDMA Mods) - Outdoor
58 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
Bias Tee Installation in Ultrasite (WCDMA Mods) - Indoor
59 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
MHA installation hints• All MHA eqmt have been fully tested in production; no need to repeat
stand alone testing in the field, visual check is enough• Check that you are using correct sub band (1800!)• Only vertical installation allowed!• Max. 1/2” jumper allowed to connect to the MHA• 25...30 Nm torque for MHA connectors allowed• Improper installation can cause intermittent alarms or decrease
functionality, e.g. water in connection, however the MHA can be OK!• Touching to 7/16” connectors can decrease system performance!• MHA grounding always recommended• In coastal areas and in islands, use extreme weather proofing for all
connections (see Antenna Line Technical Bulletin)!
60 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
MHA System installation verification
• Basic msmt: Return loss for the antenna line, first without, then with an MHA
• VSWR more accurate than RL msmt when converted to DTF mode
• If all reflections (of connectors, jumpers, feeder) are in the same phase -> can cause very poor result even if individual components are ok -> RL can be as low as 9-10 dB
- use DTF- if no peak is higher than the others, the result can be true- if result remains lower than 11 dB, contact Site Mgr
61 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
...MHA System installation verification
• Always do calibration properly- for tst cables, adapters, connectors- good calibration kit
• With SiteMaster- check that you are using cont. sweep mode, not single sweep - check that msmt is not out-of-scale (->use autoscale)
• Bias Tee- Return Loss msmt- DC continuity, between center pin of 7/16 and opposite end's
SMB connetors
62 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
MHA TesterMHA Tester Tool is used to monitor the condition of MHA. It measures the current drawn by MHA and shows if MHA is operating normally or not. The tool can monitor Nokia Talk-, Ultra- and WCDMA MHA’s.
Tool can be used for two purposes:To monitor MHA condition.To power up the MHA for antenna line VSWR if msmt in Rx band.
63 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
MHA Installation Verification
1) Check all connections
2) Any component in antenna line can be broken;
However MHA is the only active eqmt that can generate an alarm, also MHA alarm is the only alarm that is reported
-> it is not necessarily MHA that is broken!!
64 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
•
65 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
66 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
67 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
UltraSite EDGE & WCDMA MHA Products CS72991.01 Masth.Amp.MNGA900, Rx:880-915 MHzCS72991.02 Masth.Amp.MNTB850 R, Rx:824-849 MHzCS72992.02 Masth.Amp.MNDB1800, Rx:1740-1785 MHzCS72992.03 Masth.Amp.MNDA1800, Rx:1710-1755 MHzCS72993.08 Masth.Amp.MNPF FB1900, Rx:1850-1910 MHz CS72995.05 WMHB, WCDMA Dual MHA, Rx:1920-1980 MHz
CS7299411 Bias Tee WBNB 800/1900 EDGE non VSWRCS7299412 Bias Tee WBVC 800/900 EDGE with VSWRCS7299413 Bias Tee WBVB 1800/1900 EDGE with VSWRCS7299611 Bias Tee WBVA 1900/2100 WCDMA with VSWRCS7299613 Bias Tee WBNB 1900/2100 WCDMA non VSWRCS7299420 Bias Tee 1800/1900, VSWR and sniffer
Note! MHAs always include pole mounting bracket. Bias Tees always include pwr/alm cable.
68 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
MHA Reliability
69 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
MHA Validation by Nokia
• Component level, layouts, etc. according to Nokia requirements
• All electrical figures compatibility fully tested
• Environmental tests (incl. salt spray test)
• Operational and alarm current window testing
• Other tests done in co-operation with vendors: Vibration, chock tests, lightning, max.power handling, etc. -> for operation, storage and transportation
• System and Type Approval tests-EMC -RF (IM, sensitivity, blocking)- safety
70 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
MHA Reliability
• MTBF is - a design comparison done in favourable conditions (at 25°C)- typically Nokia MHAs have a very high MTBF value (400kh…)
• Field Returns- MTBF design data don't take into account:
- installation quality - other handling of units- mechanical/operator issues- NFF units
- Even 30% of returned units can be NFF “no fault found”!- Field MTBF have been proven to be 2 times the calculated figure!
• Nokia delivered nearly half a mill. MHAs by today
71 © NOKIA 1999 FILENAMs.PPT/ DATE / NN
MHA Support
MHA Contacts:
Product Mgr Tomi Karvonen
Aux PE Project Mgr Jouni Pelkonen
Aux Customer Care Juha Kassinen
BSS System Support Mgr Juha Määttä