NEC PASOLINK+ User manual

2002 NEC Corporation MTD-PL-028
141005
PASOLINK+
6-38 GHz 155 MB DIGITAL RADIO SYSTEM
(1 + 0 / 1 + 1 SYSTEM)
This document describes the current version of NEC standard equipment. If
there is any conflict between this document and the System Description and/or
the Compliance statement, the latter will supersede this document.
The specifications or configuration contained in this document are subject to
change without notice due to NEC's continuing design improvement.
NEC Corporation

MTD-PL-028/141005 PASOLINK+155 MB 1+0/1+1 SYSTEM
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TABLE OF CONTENTS
LIST OF ABBREVIATIONS........…...….…...............…...............…....…......………….….........ii
1. INTRODUCTION ............................................................................................................... 1
2. FEATURES......................................................................................................................... 3
2.1 Advanced Technologies and Superb Performance........................................................3
2.2 High System Gain............................................................................................................3
2.3 Easy and Quick Installation.............................................................................................3
2.4 Common platform architecture.......................................................................................3
2.5Frequency Agility and Easy Tuning.................................................................................3
2.6TX Power Control............................................................................................................3
2.7System Flexibility.............................................................................................................3
2.8Maintenance Facilities .....................................................................................................4
2.9Service Channels (Please see 4.2 Service Channel for available channel)...................4
2.10 Electromagnetic Compatibility (EMC)..........................................................................4
2.11 Conformity with the ITU................................................................................................4
3. RELIABILITY AND QUALITY............................................................................................ 7
4. INTERFACE........................................................................................................................ 9
4.1 Digital Signal Interface.....................................................................................................9
4.2 Service Channel (SC)....................................................................................................10
4.3 RF Port..........................................................................................................................10
4.4 Alarm Signal Interface....................................................................................................10
5. DESIGN CONSIDERATIONS ......................................................................................... 11
5.1 Protection Capability......................................................................................................11
5.2 Antenna..........................................................................................................................11
5.3 Transmitter-Receiver (ODU).........................................................................................11
5.4 Indoor Unit (IDU) ............................................................................................................12
5.5 Other Tools and Materials .............................................................................................13
5.6 Option Panel..................................................................................................................14
6. PERFORMANCE.............................................................................................................. 21
6.1 Performance..................................................................................................................21
6.2 IDU.................................................................................................................................23
6.3 Service Channels (Please see 4.2 Service Channel for available channels)..............23
6.4 General..........................................................................................................................24
6.5 Events............................................................................................................................25
6.6 Indication........................................................................................................................25
6.7 House Keeping Alarm/Control Interface........................................................................26
6.8 Alarm Items....................................................................................................................27
6.9 Performance Monitoring/Metering Items........................................................................28

PASOLINK+ 155 MB 1+0/1+1 SYSTEM MTD-PL-028/141005
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LIST OF ABBREVIATIONS
AMI Alternate Mark Inversion
ANT Antenna
APC Automatic Phase Control
ATPC Automatic Transmitter
Power Control
ATT Attenuator
B8ZS Binary 8-Zero Substitution
BACK-
Pressure Anti-congestion control
BB Base Band
BBE Background Block Error
BER Bit Error Rate
BER-M Bit Error Rate Measuring
CBL Cable
CKT Circuit
CMI Coded Mark Inversion
CN Carrier to Noise
CONV Converter
CTRL Control
DEM Demodulator
DI Data Input
DO Data Output
DPU Digital Processor Unit
DSC Digital Service Channel
EMC Electromagnetic
Compatibility
EOW Engineering Order Wire
ES Errored Seconds
Ethernet LAN specification along
IEEE802.3
FEC Forward Error Correction
FIL Filter
FOTS Fiber Optical Transport
System
HDB3High Density Bipolar order 3
HIC Hybrid Integrated Circuit
HYB Hybrid
IDU Indoor Unit
IEC International
Electrotechnical Comission
IF Intermediate Frequency
INS Insertion
INTFC Interface
ITU-R Radio Communication
Sector of ITU
ITU-T Telecommunication Sector
of ITU
LCT Local Craft Terminal
LDC Laser Diode Current
LO Local Oscillator
LOF Loss of Frame
LOS Loss of Signal
MAINT Maintenance
MIC Microwave Integrated Circuit
MLC Multi-level Coding
MLCM Multi-level Code Modulation
Technique

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MMIC Monolithic Microwave
Integrated Circuit
MOD Modulator
MODEM Modulator Demodulator
MTPC Manual Transmitter Power
Control
MUX Multiplexer
NE Network Element
OC Over Current
ODU Outdoor Unit
OFS Out of Frame Seconds
OH EXT Overhead Extension
OPT Optical
OW Order Wire
PBR Parity Bit Error Rate
PM CARD PASOLINK Management
Card
ppm parts per million
PS Power Supply
PWR Power
QAM Quadrature Amplitude
Modulation
R-BER Residual Bit Error Rate
RF Radio Frequency
RFCOH Radio Frame
Complementary Overhead
RMT Remote
RS Reed Solomon coding
RSL Received Signal Level
RSOH Regenerator Section Overhead
RX Receiver
SC Service Channel
SDH Synchronous Digital
Hierarchy
SES Severely Errored Seconds
STM Synchronous Transport
Module
T-R Transmitter Receiver
TX Transmitter
UAS Unavailable Seconds
VF Voice Frequency
WS Wayside

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1. INTRODUCTION
NEC’s new PASOLINK+series; 6-38 GHz 155 Mbps Synchronous Digital Hierarchy (SDH)
microwave radio systems are designed to transmit one synchronous transport module (STM-
1, 155 Mbps). They operate at the 6-38 GHz radio frequency band using quadrature amplitude
modulation (32-QAM or 128-QAM), and have a transmission capacity of OC3 or STM-1. In
addition to the PASOLINK+systems for short distance links, NEC offers a complete product
line of STM-1 radio systems that includes the 4, L6, 7, 8, 13 GHz 155 Mbps 128 QAM and 4,
5, U6, 8, 11 GHz 155 Mbps 64 QAM systems for long distance use. For those systems,
please refer to the other technical descriptions.
The PASOLINK+radio systems are fully compatible with SDH Network Elements (NE). The
systems consist of antennas, outdoor units (ODU), and indoor units (IDU). They are
connected through a coaxial cable for each radio channel. Available configurations are non-
protection type (1 + 0) and protection type (1 + 1). The protection type is available for twin-
path type and hot-standby type.
Regarding antenna configurations there are two types available. There is a one-antenna
system employing hybrid (HYB) RF combiner and divider, and a two-antenna system method
using each antenna for two ODUs independently. The hybrid is the passive device that
combines and divides the signals between two ODUs and an antenna. Therefore, the one-
antenna system requires only a single antenna, however, additional loss between ODUs and
antenna have to be considered. On the other hand, the two-antenna system has high system
gain as same as non-protection type.
STM-1 interface can be selected for electrical or optical. Therefore, PASOLINK+systems are
useful in fiber optical transport system (FOTS). Additionally, Fast Ethernet interface can be
selected for IP network.
The PASOLINK+employs a full digital MODEM using enhanced signal processing techniques
and forward error correction (FEC).Moreover, the bit-error-rate characteristics against
receiver input signals are excellent for applying FEC (32-QAM System: MLCM (multi-level
code modulation) and RS (Reed Solomon method), 128-QAM System : QAM and RS).
The equipment can be installed easily and quickly using a PC (as Local Craft Terminal),and
as a maintenance tool.

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Type 1 Type 2
11-38 GHz 128 QAM/32 QAM type 6-8 GHz 128 QAM type
(0.3m Diameter Antenna) (Low Loss Coaxial cable connection to Antenna)
Figure 1. Antenna and (1 + 0) ODU
Figure 2-1. Indoor Unit (IDU) 1 + 0 Configuration
Figure 2-2. Indoor Unit (IDU) 1 + 1 Configuration

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2. FEATURES
2.1 Advanced Technologies and Superb Performance
Throughout the SDH radio system, NEC’s own advanced technologies are used. Intensive
use of Microwave Integrated Circuits (MIC’s) and Hybrid IC’s (HIC’s) make the TRP durable
and compact. Also, custom made large-scale integrated circuits (LSI’s) are applied. For
example, a new digital MODEM is incorporated in a single LSI chip, specially developed by
NEC for the radio equipment. Furthermore, low-power high-speed complementary metal
oxide semiconductor (CMOS) LSI’s are extensively used, making the equipment more
compact and reducing the power consumption.
2.2 High System Gain
•Multi-Level Coding Modulation (MLCM) is applied to ensure a better error performance(32
QAM System).
•Forward Error Correction (FEC) with Reed-Solomon coding is equipped to improve BER
performance.
2.3 Easy and Quick Installation
•Interconnection: Only one coaxial cable and automatic equalization (up to 450 m by using
12D-FB cable)
•Compact and Light
•Various mounting methods for IDU, ODU, and antenna
2.4 Common platform architecture
•The ODU of 128 QAM type can be used for 32 QAM type.
2.5Frequency Agility and Easy Tuning
•Field tunable local-oscillator (Synthesizer)
•RF point frequency can be changed through LCT (Local Craft Terminal, except 6 –8 GHz)
•Frequency Tunable without changing RF FIL on Subband basis.
2.6TX Power Control
•ATPC (Automatic Transmitter Power Control) reduces interference to neighboring
systems, improves residual BER performance, alleviates upfade problems. The adjustable
range of ATPC is -20 dB to 0 dB (128-QAM) and –23 dB to 0 dB (32-QAM).
•MTPC (Manual Transmitter Power Control) is also available through LCT. The adjustable
range of MTPC is –20 dB to 0 dB (128-QAM) and –23 dB to 0 dB (32-QAM) at 1 dB step.
2.7System Flexibility
•(1 + 0) Unprotected
•(1 + 1) Hot-standby
•(1 + 1) Hot-standby with Space Diversity
•(1 + 1) Twin-path (Hitless switching)
•IDU is commonly used for all frequency bands.
(In case of 1+1 Hot-standby or twin-path system, either one antenna system with hybrid
combiner or two antenna system excluding hybrid combiner is chosen. Please refer to Fig. 3
(a), (b).)
1 + 1 Hybrid combiner: NEC provides 3 dB balance-type hybrid combiner.

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2.8Maintenance Facilities
•Pre-settable BER alarm point: 10-4, 10-5, 10-6
•IF, Baseband (near end, far end) loop back (without external equipment)
•Remote monitoring of ODU operating condition on IDU
•Calling facility between IDU’s
2.9Service Channels (Please see 4.2 Service Channel for available channel)
•Order Wire : IDU-IDU/IDU-ODU/ODU-ODU party line connection
(EOW) (EOW system using PASOLINK MONITOR (option) at ODU)
•Digital Port : 64 kbps Sync., 2 ch standard
•VF Port : 0.3 to 3.4 kHz (1 ch) 600 ohms, 2 ch standard
•Wayside : 2.048/1.544 Mbps, 1 ch (optional at 32 QAM STM-1)
•10 Base-T : 1 ch (optional; exclusive use in other service channels)
•Cluster Alarm : 2 ch (optional; auxiliary alarm transmission)
2.10 Electromagnetic Compatibility (EMC)
•Complies to ETS 300385
2.11 Conformity with the ITU
•Conformity with the relevant ITU-R, ITU-T Recommendations and European
Telecommunication Standard (ETSI)
ANTENNA
ODU 1
HYBRID
ODU 2
Figure 3(a). Ways to Mount the 1 + 1 PASOLINK+using a single Antenna

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Figure 3(b). Ways to Mount the 1 + 1 PASOLINK+using two Antennas