NEC of America 5845 5.8 GHz Unlicensed Digital Microwave Radio User Manual Manual Volume I

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Document ID	853425
Application ID	KKxA6JQtfPxBbSNRE42wpw==
Document Description	Manual Volume I
Short Term Confidential	No
Permanent Confidential	No
Supercede	No
Document Type	User Manual
Display Format	Adobe Acrobat PDF - pdf
Filesize	94.39kB (1179929 bits)
Date Submitted	2007-10-10 00:00:00
Date Available	2008-02-21 00:00:00
Creation Date	2007-09-24 15:30:52
Document Lastmod	0000-00-00 00:00:00
Document Title	Manual Volume I

R01—304820-051E
031020
5.3 GHZ 15128150 MB
PDH DlGlTAL MECROWAVE RADIO SYSTEM
NLite L
(PDH 1+Ol11‘1 SYSTEM)
SECHONI DESCHPHON
CONTENTS
CONTENTS
TITLE
PAGE
1, GENERAL ...................... 1.1
2. SYSTEM DESCRIPTION mm-
2.1 System Configuration "-
2.2 System Performance ....
2.3 RF Channel Plan ........
2.4 Alarm and Control-"mun”
2-1
2-1
2-6
2-1 0
-........................... 2.10
2.4.1 Alarm Indication and Reporting ------------"--~--—~-- 2-10
2.4.2 Psriormance Monitoring/Metering Data Reporting-
2.4.3 Automatic Transmitter Power Contra
z_4_4 Loophack Central ...........................
2.4.5 NetworkManagement(Optional)
(released afler Jan., 2004)
2.5 Prolecfion Swltchlng mm-
2.5.1 Swltchlng Centre
2.8 Power Suppl mu
3. SUBSYSTEM DESCREPTION
INDOOR UNlT '- M»-
3.1 Composlticn --
3.2 Funcflonal Operation u..........
2-13
2-13
"mum-m. 2.17
3.2.1 ModulatorSection-mm-mnm ............................. 3.5
3.2.2 Demodulatcr Section mum--
.--.-.-...................... 3.5
CONTENTS
TRP UNIT ununuuuuu-nu
3.3
3.4
3.4.1
3.4.2
ROl—SOAEZG
TITLE PAGE
"mu-«n...
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Compnifionumuun nm-Iml-m-
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Functional Op-raflon mum-mu
Transmitter Section n-luonnuuuunu'uunmunun-u n. 3.7
Racelver 59amn...........-.........m-.m-mum-mum.- 3.7
ROI-504520
GENERAL
1 GENERAL
This section provides descriptive information on the 5.8 GHz 15/28/45 MB
digital microwave radio system for the plesiochronous digital hierarchy
(PDH).
The 5.8 GHz 15/28/50 MB digital microwave radio system is designed to
transmitting DS-l or DS-3 level signals. It operates in the 5.8 GHz radio
frequency hand using the 32 QAM or 128 QAM Quadrature Amplitude
Modulation (QAM) method and has a transmission capacity of 8 x 11544
MB or 16 x 1.544 MB, for 1 x D53 64 QAM is utilized. Included herein
are system description and subsystem description.
GENERAL ROI-804820
(This page is intentionally lefi. blank.)
ROI-504820 SYSTEM DESCRIPTiON
2. SYSTEM DESCREPTlON
can; s
The system description outlines the system configuration. system
performance, RF channel plan, alarm and control, protection switching,
and power supply,
2.1 System Configuration
The system consists of the Modulator-Demodulator (MDP), Transmitter-
Receiver (TRP) and the Antenna (see Fig. 2-1 to Fig 2-2), The MDP twes are
as follows:
0 MDP-lSMBST-lA: 8 x 1.5 MB, Fixed bit rate type
- MDP-ZSMB7TAIA: 16 x 1.5 MB, Fixed bit rate type
- MDP-SOMBéT—lB: 1 x 45 MB, Fixed bit rate type
The 5.8 GHz 15/28/50 MB microwave radio system is a l-hop (paint-to—point)
system between two terminal stations, and is configured in the HI (Hot
Standby) or HO (Expandable) system.
i: Sage“, naoo’
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Fig. 2-1 Outline ofMDP
ROI-504820 SYSTEM DESCRIPTION
5.8 GHZ BAND TRP
Fig‘ 2-2 Outline of TRF
ROISMBZD
SYSTEM DESCRIPTION
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SYSTEM DESCRIPTION
2.2 System Performance
The system performance characteristics of the 10.5 GHz 15/28 MB digital
microwave radio system are listed in Table 2-2.
Table 2-1 System Performance (Typical Value)
A. Major Specification
Transmission Signal
Transmission Capacity
Modulation
Demodulation
Forward Error Correction (FEC)
Equalizer
Data Interface
Impedance
8 x DSl/16 x DSl System
1 x D53 System
Service Channel
OEOW
- RS-232C(*1)
. V.11(*l)
D51 &D53
8 x 1.544 Mbps (8 x DSl)/
16x1.544Mbps(16xDSl)/
1x 441736 Mbp/s (I x D53)
32 QAM (for s x D51)/
123 QAM (for 16 x DSI)/
64 QAM (for l xDSS)
Coherent detection
MLCM/RS DFE
BSZS or AMI for D5] (ANSI T1, 102)
100 ahms,ba1anced
75 ohms, unbalanced
ICH
lCH
2CH
ROI-504820
ROI-504820 SYSTEM DESCRIPTlON
Table 2-1 System Performance (Typical Value) (Cont’d)
TX Power Control ATPC/MTPC
0 to 23 dB (1 dB step) (8 x 1351) 0 to
20 dB (1 dB step) (16 xDSl & l xDS3))
TX Switching System Mute output power of the reserve TRP (HS/HS) in
split system.
RX Switching System Hnless swnch
Switching Range
Delay Equalization Range
Switching Criteria
Loopback Function
Perfonnance Monitoring (* 1)
Measurement
Alarm Output
Housekeeping Alarms (* l)
Dynamic
more than 447250 us in total
Remote and Auto
(F ASYNC ALM, LOW BER ALM)
LB 1 (Far End, CH by CH basis)
L132 (Near End, CH by CH basis)
IF (MODEM loop back)
BEE, ES, SES, UAS, OFS (total)
TX power level, RSL, BER
Relay contact (F arm—C);
7 items (4 alarm items mapping allowed)
Relay contact (Form-C)
4 Items
Photo-coupler 6 items
SYSTEM DESCRIPTION ROI-504820
Table 2.1 System Performance (Conx’d) (Typical Value)
Bi System Parameter for Split Type
S ecificati on Condition/Remarks
Transmission Capacities 8/16 X D51
Transmit Power 5.8 GHz +25 dBm Typical
System Gain 5-8 GHZ 105 dB @10*°, Guarantee —3 dB
MDP—TRP IFL Cable Length (Split type) 200 m
RG~14/U, RG-224/U or
Equivalent
Ambient Temperature MDP 0°C to +50°C Guarantee
TRP 733°C to +50°C
—i 0°C to +55°C Workable
——40°C to +55°C
—40° C to +70“ C Storage
mama H‘m‘idny Less than 90°/a at 50°C
(Non-condensing)
Power Supply Voltage 36 to 60 V DC Input
Floating
ROI~SD4820
SYSTEM DESCRIPTION
Table 2-1 System Performance (Cont’d) (Typical Value)
C. OVERALL
MDP-TRP Interconnection Cable
l/F Line Cable
(Type and Maximum Cable Length)
Primary Voltage (Safety
Extra-Low Voltage (SEL V))
Power Consumption (MDP + TRP)
Dimension
MD?
TRP
TRP
Temperature Range
Guaranteed Operation
MDP
TRP
Workable Operation
MDP
TRP
Transport and Storage
MDP
TRP
Relative Humidity
Altitude
Single coaxial cable, 50 ohms impedance
- 200 m (SD-PB coaxial cable or equivalent)
0 300 m (SD-FE coaxial cable or equivalent)
0 350 m HOD-FE coaxial cable or equivalent)
0 450 m (lZD—FB coaxial cable or equivalent)
- —48 V DC (_36 to "60 V) or
+48 V DC (+36 to +50 V)
110Worless
482 mm (W) x159 mm (H) x 300 mm (D)
240 mm (W) x 243 mm (H) x124 mm (D)
Approx 10 kg, H0 system (Including optional module)
Approx. 14 kg, l+1 system (Including optional module)
Approx. 5 kg
0°C to +50°C
733°C to +50°C
—10°C to +55°C
440°C to +55°C
40°C to +70°C
—-40°C to +70°C
Less than 90% at 50°C (Non-condensing)
Up to 4,000 m
SYSTEM DESCRIPTION Rel-504520
2.3 RF Channel Plan
Radio frequencies for the NLite L 5.8 61-12 is as follows:
- FCC 10.5 6141 Band : 5725 Mhz to 5850 Mhz
The actual TX frequency of the TRP should be within the TX radio
frequency band of the RF CKT in the TRP and is entered using the local
craft terminal (LCT). The corresponding RX frequency is automatically
set afier the TX frequency is entered.
For details, refer to Appendix in Description section,
The frequency spacing between adjacent channels should be taken as
following system.
- 8 x D51 system : 3.75 MHz
- 16xDSl system:5MHz
. l xDSS system: 10 MHz
2.4 Alarm and Control
The alarm and control system is shown in Fig. 2—6. The functions of the
alarm and control circuit are as follows:
0 Alarm indication and reporting
0 Performance monitoring/metering data reporting
0 Automatic transmitter power control
- Loophack control
t Network Management (Optional)
2.4.1 Alarm indication and Reporting
Alarm indication and repom’ng functions are provided with the MDP.
Summary alarm indicators using LED’s are provided for the TRP and
MDP, separately. When the TRP is detected any alarm by the alarm
detector in the TR? are sent to the CTRL module in the MDP. This causes
the TRP alarm indicator on the MDP front panel to turn on. Similarly, any
MDP related alarms that are detected will cause the MDP alarm indicator
on the MDP fiont panel to turn on. External reporting of alarms is also
provided through closed relay contacts accessible via the front panel
interface (see Table 2~3).
ROI-804820
SYSTEM DESCRIPTION
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ROI-504320
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ROIsOABzo SYSTEM DESCRIPTlON
2.4.2 Performance Monitoring/Metering Data Reporting
To monitor the transmission quality, the equipment is provided with the
performance monitoring and the metering functions. The CTRL module
polls the difi'erent modules and gathers PM/Metering information. A
“invalid” displayed in the PM results screen indicates that the value is
illegal. A “MAINT” is displayed if the PM results are obtained while the
equipment is in maintenance mode. When the equipment clock setting is
changed or the power is turned on/oif, the PM value is judged to be
invalid. The monitoring items are as follows:
Performance Monitor (released afier Dec, 2003)
- Out of Frame Second (OFS)
- Background Block Error (BBB)
Errored Seconds (ES)
Severely Errored Seconds (SES)
Unavailable Second (UAS)
- TX POWER
- RX LEVEL
' TRP PS MON
' BER (Bit Error Rate)
2.4.3 Automatic Transmitter Power Control
The automatic transmit power control (ATPC) fin-lotion automatically
varies the TX output power according to path conditions. in the SHF and
EHF hand, fading exerts heavy influences on propagation, causing the
receive signal level at the opposite station to vary. The ATPC function
operates by controlling the transmit output power of the opposite station
according to the variation of the received signal level at the local station.
ATPC provides the following advantages:
~ Improvement in up fading characteristics
- Improvement in residual BER characteristics
' Reduction of interference to inn-a system
- Reduction ofinterference to inter system
ROI-504820
TRANSMlTTING snnon
Fig.
MODE I
POWER CTRL
SUBSYSTEM DESCRIPTION
A functional block diagram ofthe ATPC operation is shown in Fig.
2-6. ATPC improves the BER characteristics under adverse changes
in climatic conditions and reduces the possibility of interference, To
implement ATPC, the received level (RX LEV) is detected by the
receiver (RX) and passed on to the CPU on the CTRL circuit of the
MODEM module, The CPU then determines whether the transmit
output power needs to be controlled. This is based on the transmit
output power, the minimum and maximum values of the output
control range (ATPC range), ATPC is relevant for the receiving
threshold (RX Threshold) level that were previously specified value
using the LCT or PNMTi
A control signal (POWER CTRL), whose function is to maintain the
RX signal by lowering or raising the TX output power of the
opposite station, is generated by the MODEM module through the
CPU circuit. This control sigtal is based on the result of comparison
between the current receiver input level and the preset receiving
threshold level. This control signal is sent to the opposite station to
control its transmit output power.
At the opposite station, this control signal is detected by the
MODEM module. It the MODEM module, in accordance with this
control signal, produces a control that will either raise, lower or
maintain the current TX output power.
RECEMNGSIAIJQN.
2-4 ATPC, Functlonal BLock Diagram
ROI-804520
SYSTEM DESCRIPTION
The ATPC Control System of the NLite L transmits the information on the
receiving level to the opposite station and controls the transmission level
of its local station in accordance with the receiving level of the opposite
station. Transmission level control can be used not. only for setting the
same operation (ATPC-ATPC) between local station and opposite station
but also for operation in combination of stations with different operation
(MTPC—ATPC, ATPC-MTPC) between own station and opposite station.
The station set in MTPC mode is not controlled by the information from
opposite station but is fixed in its transmitting output level.
Even if the station is set in the MTPC mode, the opposite station is likely
to be set in the ATPC mode. Therefore, setting the RX Threshold
(Receiving threshold level) is required for controlling the transmission
level of the opposite station. Between the stations that are respectively set
in the MTPC mode, however, the setting is disabled.
The following is an example of operation between stations set in MTPC-
ATPC mode.
5 ATIQN A § ATIQN B
(Z;
NLIte L NLite L
MTPC ATPC
(RX Threshold: —50 dBm)
The transmitting level of station E is controlled so that the receiving level
of station A in the above figure reaches the RX Threshold set level (—50
65m) set in station A. This method is used in station A for reducing the
level of interference to other route. As station A is set in the MTPC mode,
the transmitting level is kept unchanged.
Then an example of using MTPC-ATPC is shown below As shown in the
figure, in the master station commimicating with many substations, waves
gather from substations possibly causing interferences. Therefore,
substations must be set in the ATPC mode to minimize the diffraction
(interference) to other routes while reducing the receiving levels from
individual substations to the minimum In substations, there is little
possibility of occurring interferences; therefore, the master station is set in
the MTPC mode to permit transmission at a constant level.
SYSTEM DESCRIPTION ROI-504820
(ATPC)
BSTATION 1
[HZ—J- Tfiflifié <'®Z-}E
(ATPC) T TIO (ATPC)
§y§§TAT|gu 5 3 SUBSTATION 2
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s TATtO guBSTAT gm 3
® : Diffractlcn to fiber route.
ROI-804520 SYSTEM DESCRIPTION
2.4.4 Loopback Control
The lunpbflck fimction is provided fur checking the sysoem quality during
maintenance and/or tn quickly isolate a fault lacstion. The control is
performed by the LCT, the mm or the PNMS.
The following types uf loopback are provided:
~ DSl near-end loopback (DSl LB!) at the CTRL mudule ((a) in Fig.
24).
- Main D81 far-end loopback (DSI LBZ) at the CTRL module (03) in
Fig. 2.7).
- E‘ loopback (IF-LB) at the MODEM module ((c) in Fig. 2-7).
Notes: 1. While the IF loopback is in execution, monitoring of the
opposite and the subsequent stations are disabled on the
PNW and PNMT
2. Loopback control will inter-mp: the radio 1in
connection.
TRANSMITnfl gun mm
MDP TRF TR? MDP
PDH E/u SPEE'J SPEED ma
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CTRL M_QDEM M105 QIEL
GTRL
Note: Reverse direction is the same ax abave,
Fig. 2-7 Loopback Locatlon
SYSTEM DESCRIPTION ROI-304820
2.4.5 Network Management (Optional) (released after Jan., 2004)
The Network Management System (NMS) configuration is shown in Fig.
2-8. The pasolink network management system (PNMS) is connected to
the PNMS Vii/LAN connector of the MDP located at the designated
maintenance center while the pasolink network management terminal
(PNMT) is connected to the PNMT connector on the MDP of remote
stations The FNMT/PNMS provides monitoring and control of the actual
microwave link status and its associated NLile L equipment Status
information form and control signals in remote stations are transmitted
using one of the SC channels.
Note: This SC channel is multiplexed on the main signal for
subsequent transmission to the opposite station. (f the IF
Inopback is executed the SC channels of the station under
maintenance will also be looped baCk. thereby making it
impossible to monitor or 00an the opposite and the
subsequent stations
For derailed information, refer to the related PNMS or PNMT manual
__<41’>_‘_
SC
NLite L ¢ eeeeeeeeeeee » NLiia L
PNMS V.11ILAN PNMT
v CONNECTOR v CONNECTOR
PNMT
PNMS: Pasclink Network Management System
PNMT: Pasolink Network Management Terminal
Fig. 2-8 Network Mun-gomont Syshm
Roi-304820 SYSTEM DESCRIPTION
2.5 Protection Switching
Protection switching is provided for the TX and RX sections in the Hot
Standby (HS) system and is performed by automatic control and manual
control.
The TX protection switching is performed by the mute control on the No.1
and No] channel TRPs at the transmitting end of the Hot Standby system
in the split type. The RX protection switching is performed by the Hitless
Switch (l-IL SW)“ onthe SW UNIT nfthe MDP at the receiving end ofthe
Hot Standby system.
Note: The killers switching of Main DSI data is performed when the
detected BER exceedr the internally preset value (3 x 107) in
automatic switching mode. When switching is performed by
manual control or by an alarm event, hit is occurred by
switching. The hitless switching is not applied for DSC signals
The manual control should be performed in maintenance status. This is
because automatic switching is implemented by hardware logic and
manual switching is implemented by software logic. That is, automatic
switching and manual switching are completely independent and different
switching conditions. Then, note that when the operator reverts to
automatic switching alter performing manual switching, the channel will
be re-selected by the automatic switch connol.
2.5.1 Switching Control
(a) TX Switching
The TX switching is performed by manual or automatic control.
The manual control is executed by operator tom the LCT in
maintenance status. The automatic switching that is initiated by
detection of a failure in the n-ansmit section of the MDP or TRP.
While TX switching, either initiated manually or automatically,
may cause a instantaneous interruption of the transmission.
Automatic and manual TX switching have the following
operational features:
- Manual switching:
Selects TRP of either No,l or No.2 even if TRP is alarm status.
The manual switching control has priotity over the automatic
switching control.
- Automatic switching:
The switching is performed when the modulator alarm is
detected in the MDP or when the TX IF input alarm, TX power
alarm or APC alarm is detected in the TRP.
SYSTEM DESCRIPTION
RDISMBZD
In the automatic switching mode, No.1 channel can be given
Priority or Non-priority. Under the priority mode, when
switchover has been performed from No.1 CH to No.2 CH
caused by No.1 CH nlami, reversal switchover is performed
automatically from No.2 CH to No.1 CH when alarm condition
of the No.1 is restored. Under the Nompriority mode, the
switchover is performed alternately fi'fim No.1 CH to No.2 CH
or vice versa according to the alarm status.
The TX switching condition is shown on the LCT and by the
TXl and TX2 STATUS indicators on the SW UNIT.
(h) RX Switching
The RX switching is performed by the HI. SW on the SW UNIT of
the NDDP in the Hot Standby system.
The RX switching is performed by manual or automatic control.
The manual control is executed by operator from the LCT in
maintenance status. The automatic switching that is initiated by
detection of a failure in the receive section of the MDP or TRP.
The switching priority and switching conditions for automatic and
manual switching are identical to those of TX switching. The
switching condition is shown on the LCT and by the RX] and RX2
STATUS indicators on the SW UNIT.
ROI-504820
SYSTEM DESCRIPTION
2.6 Power Supply
The power supply system block diagram is shown in Fig 2-9. The DC-DC
CONV module on the MDP produces regulated +53 and +3.6 V DC power
from 148/124 V DC input power for the component modules in the MIDP.
Also, this module produces a regulated —43 V DC power from the —48 V
DC input power for the TRP.
The power to the TRP is supplied through the coaxial cable which is also
used for the IF and other signals. The DC-DC CONV module of the TRP
produces +7/+9/+10 and —15 V DC power for the component modules
from the -43 V DC power supplied from the MDP.
MDP TRP (No.1 cu) ,
T oan‘ch h‘
_._. sew
IF m coma SEPéK'ISME l; g‘m
sew IF our? FlL J ‘f .
um I
Do ”77“ fig .
lNPUT ‘_(_L. 43V (JAM . Dc—DC —- wl+91+10V
45 w MoDEM l 4’ conv _- -15V 1
+4sv r ‘
»5.av L,W._._,.7>.J
mom [
,,,,,,,,,,,,,,,,,,,,, “m1 r A _ _ ENEEQHL _ j
+5,3V ,, .
¢3.6v || 1
(SAMEASABQVE) - ~ (SAME ASABOVE) ‘
H l
, , A _ ..l L , , , , A J
Note: The common (CTRL and LAN/DSC) moduIe: are supplied DC
powerfinm the DC—DC CONV modules of both No. I and No 2
m protect the system.
Fig. 2-9 Power Supply System Block Diagram
SYSTEM DESCRIPTION rim-304820
(This page is intentionally lefi blank)
ROI-804820 SUBSYSTEM DESCRIPTION
3. SUBSYSTEM DESCRIPTION
Li Wmmflflmwfi ffiflm
Described herein are composition and functional operation of each module
of the MDP and (he TRP.
INDOOR UNIT
3.1 Composition
The following equipment are composed of appropriate plug-in units as
listed in Table 3-1. The component unit/modules are arranged on a shelf as
shown in Fig. 3-1.
Table 3-1 MDP Equlpm-m
m Equlpmem Name Capaelty Modulation
H0763A MDP»15MBST-1A 3 X D5! 32 QAM
1107638 MDP~28MB7T>1A 16 x D51 128 QAM
- MDP-l SMBST-IA: 8 X DSl, Fixed bil rate type
' MDP-28MB7T-1A: 16 x DSl, Fixed bit rate type
Tabla 3-2 MDP Component
MDP-15MB5T-1A "lawman-1A
(uxbsn (1enDs1)
Unlt Name
H0756A SW UNIT
H07665 sw um
H0936A MD mm N0. 1 CH
1409355 MD um
H0936A MD mm No. 2 on
HBDSGB MD UNIT
HDDJSA cons cow optional 03)
H0934A LAN mm: uplinnal m)
Notes:1. x‘ : Applicable, fl zNolAppIicabIe
2. ‘Location numbers are referred to those in Fig. 3-1.
3. Supplied afier Dec, 2003.
4. Supplied in fimlre.
SUBSYSTEM DESCRIPTION
onu
INTFC
Dc-Dc
QAM CONV
MODEM
H (TOP LAYER/BOTTOM LAYER) fl
TOP VIEW FRONT
MAIN BOARD
1A5M INTFC
(MEDIUM LAYER) {F
TOP quw
FRONT
ROI-804820
L eq—ifij- e\
Fig. 3-1 MDP Component Unit/Module Arrangement
Natex.-I. Location numbers are referred to those in Table 3—1.
2. " For details, refer tn Note 7 of Fig. 3-3 in Chapter 3,
ROI-504820 SUBSYSTEM DESCRIPTION
3.2 Functional Operation
A block and level diagram of the MDP is shown in Fig. 3-2. Functional
operations of the TRP are described separately for the mudulator section
and demodulator section.
SUBSYSTEM DESCRIPTION
us! DATA
IN/Ou'r
PNMT
Lc'r
Eovw
Ecwz
NE1
NE2
PNMsvn
wws [AN
VF waur
CLSTR ALM
‘ r
f t
21
‘TP
4»
L]. ISMINTFC 0
cTRuCF'U
MD uNlT(No.1;
MD unmmu 2) "
ROI-804820
No |
\F iNIOUT
<—~>' No.2
; IF INIOUT
Notes: 1. The recommended cable, SD-FB, has I5 dB (at 140 flab/26 dB (at 340 W2} 1sz at the
maximum length 0/300 meters (Ifloflfeet).
2. For details afSC Assignment and Sub In Mfume, refer to Fig. 3.3.
3. " Narpmvldzdfor 1-H) systm‘
Fig. 3-2 MDP Block and Laval Diagram
ROI-504520
SUBSYSTEM DESCRiPTION
3.2.1 Modulator Section
The DSl signals received from the terminal equipment enter the 1,5M
mTFC module in the SW UNIT. The 1.5M DITFC extracts the clock
component from the date signal. Then the code format of DSl signal is
convened from BSZS or AMI into Non-Retum-To-Zero (N'RZ) with
extracted clock signal and fed to the QAM MODEM module.
In the QAM MODEM module, the data signal is speed-converted into
radio frame format and time slots are made. Then additional hits for the
digital service channel (DSC), orderwire (OW) and supervisory (SV)
signals are inserted into the time slots. Moreover, error correction FEC bits
are inserted, coded and string-converted into the data signal rows for
modulation The signal is then modulated with local oscillator signal into a
340 MHz IF signal, and is fed to the ODU INTFC module.
In the ODU JNTFC module, the 340 MHz IF signal is multiplexed with the
DC power and control signal, etc. which are fed to the TRP afler the
undesired amplitude-frequency characteristics due to the IF line cable is
compensated.
3.2.2 Demodulator Section
TRP UNIT
At the ODU INTFC module, the control signal is separated from the 140
MHz IF signal received from the TRP. 140 MHz IF signal is fed to the
QAM MODEM module afler the undesired amplimdeffrequency
characteristics due to the IF line cable length and the signal level are
compensated.
The 140 MHz IF signal from the ODU TNTFC module is demodulated at
the QAM MODEM module, then regenerated to the baseband signal
composed of the radio flame. Afier the detection and correction of errors
that occurred through the radio link are corrected, and radio flame
synchronimtion is established. Then the DSC,WS, OW and SV signals
inserted in the transmitter side are extracted from the time slots The time
slots for additional bits are removed, and fed to the 1.5M [NTFC module.
The NRZ—coded data signal is converted into the original DSl BSZS or
AMI data signal and fed to terminal equipment.
The composition and functional operation of the TRP are described in this
chapter.
SUBSYSTEM DESCRIPTION ROI-804820
3.3 Compositlon
The component modules are arranged on the shelf as shown in Fig. 3-4.
INSIDE OF TRP
Fig. 3-3 TRP Component Module Arrangement
RDlSOABZO
SUBSYSTEM DESCRIPT|ON
3.4 Functional Operation
The block diagram ofthe TRP is shown in Fig. 3-5. Functional operations
ofthe TRP are described separately for the transmitter section and receiver
section.
3.4.1 Transmitter Section
An alann/conirol signal, Engineering Orderwire (BOW) signal and DC
component which are composed of the IF signal are separated through the
multiplexer (ND’X) circuit. The alarm/control signal, and BOW signal are
applied to the CONT module. The DC component is applied to the DC—DC
CONV module to produce regulated DC voltages which are used in the
TRP. The 340 MHz IF signal applied fiom the W)? is converted into the
RF signal by mixing with a local signal genemted at the SYNTH module,
The RF signal is fed to the BPF which eliminates undesired components
caused through the IF-RF conversion. The RF signal firm: the BPF is
amplified and controlled the level by the ALC and ATPC flincdon. The
amplified RF signal is sent to the antenna though the BPF and circulator.
3.4.2 Receiver Section
The RF signal received from the antenna is amplified lo the required level
by the RF amplifier. The RF signal is converted into the 140 MHz lIF
signal by mixing with a local signal generated by the SYNTH module. The
140 MHZ IF signal is AGC controlled and fed to the MDP through the
MPX circuit which combines the alarm/control signal, EOW signal and
monitoring signal.
——__l
RF IF m/ou-r
IN/OUT RF CKT (To/From MDP)
SYNTH I
RX LEV MON
(sow INIOUT) CONT
Flg. 3-4 TRP, Block Dlanram
SUBSYSTEM DESCRIPTION ROI$04320
(This page is intentionally lefi blank.)

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