COURSE HANDBOOK
Installation | Commissioning | System Configuration
FibeAir IP-20N Basic Training Course
Updated for SW Version T7.9
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FibeAir IP‐20N Ceragon Training Course
Table of Content
Intro to Radio Systems ………
005
IP‐20N Overview………..
029
Radio Frequency Units – RFUs ……….
059
First Login………...
077
Shelf Management………
085
ACM & MSE….………..……….
089
Radio Link Parameters…………..………
101
Automatic Transmit Power Control ATPC……….……….
107
IP‐20N XPIC Configuration……….……….
113
Service Model in IP‐20N……….……….
121
Protection System Configuration………..
145
Multi Carrier ABC………
159
Licensing………..
177
Native TDM ………
187
Configuration Management & Software Download………
205
Troubleshooting………..
219
Header De‐Duplication………
237
TCC Redundancy……….
247
Cascading Port Configuration ………..
257
Course Evaluation Form……….
263
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Version 3
Introduction to Radio Systems
October 2014
Proprietary and Confidential
Agenda
2
•
Radio Relay Principles
•
Parameters affecting propagations:
•
Dispersion
•
Humidity/gas absorption
•
Multipath/ducting
•
Atmospheric conditions (refraction)
•
Terrain (flatness, type, Fresnel zone clearance, diffraction)
•
Climatic conditions (rain zone, temperature)
•
Rain attenuation
Proprietary and Confidential
Digital Transmission Systems
3
Proprietary and Confidential
RF Signal
Path Terrain f1
f1’
Radio Relay Principles
• A Radio Link requires two end stations
• A line of sight (LOS) or nLOS (near LOS) is required
• Microwave Radio Link frequencies occupy 1-80GHz
Proprietary and Confidential
High and Low frequency station
Local site
High station
Remote site
Low station
High station means: Tx(f1) >Rx(f1’)
Tx(f1)=11500 MHz Rx(f1)=11500 MHz
Rx(f1’)=11000 MHz Tx(f1’)=11000 MHz
Low station means: Tx(f1’) < Rx(f1)
Full duplex
5
Proprietary and Confidential
Standard frequency plan patterns
Frequency reuse:
2,4V
1,3V
1,3H
1,3H
1,3H
Reduced risk for overshoot
Frequency shift:
1,3V
1,3H
2,4H
Reduced risk for overshoot
Only Low stations can interfere High stations
1,3H
Tx in upper part of band
Tx in lower part of band
1,3V
Low
High
Low
High
6 Tx Tx Tx Tx Tx Tx Tx Tx Tx Tx Tx Tx
Proprietary and Confidential
Preferred site location structure
7
Proprietary and Confidential RF Tx Filter BranchingNetwork(*) Feeder
Z' A' B' C' D' Feeder D Branching Network(*) C B RF Rx Filter A Receiver E Demodulator Z Modulator E' RECEIVER PATH TRANSMITTER PATH Transmitter Digital Line interface Digital Line interface Output
signal Input
signal
Radio Principal Block Diagram
Proprietary and Confidential
RF Principals
•
RF - System of communication employing electromagnetic waves
(EMW)
propagated through space
•
EMW travel at the speed of light (300,000 km/s)
•
The wave length is determined by the frequency as follows
-Wave Length
•
Microwave – refers to very short waves (millimeters) and typically
relates to frequencies above 1GHz:
300 MHz ~ 1 meter
10 GHz ~ 3 cm
9
f
c
where c is the propagation velocity of electromagnetic
waves in vacuum (3x10
8m/s)
Proprietary and Confidential
RF Principals
•
We can see the relationship between colour, wavelength and amplitude
using this animation
Proprietary and Confidential
Radio Spectrum
11
Parameters Affecting Propagation
Proprietary and Confidential
Parameters Affecting Propagation
•
Dispersion
•
Humidity/gas absorption
•
Multipath/ducting
•
Atmospheric conditions (refraction)
•
Terrain (flatness, type, Fresnel zone clearance, diffraction)
•
Climatic conditions (rain zone, temperature)
•
Rain attenuation
13
Proprietary and Confidential
Parameters Affecting Propagation –
Dispersion
•
Electromagnetic signal propagating in a physical medium is degraded
because the various wave components (i.e., frequencies, wavelengths)
have different propagation velocities within the physical medium:
•
Low frequencies have longer wavelength and refract less
•
High frequencies have shorter wavelength and refract more
Proprietary and Confidential
Parameters Affecting Propagation
Atmospheric Refraction
•
Deflection of the beam
towards the ground due to different electrical
characteristics of the atmosphere’s is called Dielectric Constant.
•
The dielectric constant depends on pressure, temperature &
humidity
in the atmosphere, parameters that are normally decrease
with altitude
•
Since waves travel faster through thinner medium, the upper part of the
wave will travel faster than the lower part, causing the beam to bend
downwards, following the curve of earth
15
No Atmosphere
With Atmosphere
Proprietary and Confidential
Wave in atmosphere
Proprietary and Confidential
Parameters Affecting Propagation –
Multipath
•
Multipath occurs when there is more then one beam reaching the receiver
with different amplitude or phase
•
Multipath transmission is the main cause of fading in low frequencies
17
Direct beam
Delayed beam
Proprietary and Confidential
Parameters Affecting Propagation –
Duct
• Atmospheric duct refers to a horizontal layer in the lower atmosphere with vertical refractive index gradients causing radio signals:
• Remain within the duct
• Follow the curvature of the Earth
• Experience less attenuationin the ducts than they would if the ducts were not present
18
Duct Layer
Terrain
Proprietary and Confidential
Parameters Affecting Propagation - Polarization and
Rain
•
Raindrops have sizes ranging from 0.1 millimeters to 9 millimeters
mean diameter (above that they tend to break up)
•
Smaller drops are called cloud droplets, and their shape is spherical.
•
As a raindrop increases in•
size, its shape becomes more•
oblate, with its largest cross-section facing the•
oncoming airflow.19
Large rain drops become Increasingly flattened on the Bottom;
very large ones are shaped like parachutes
Proprietary and Confidential
Parameters Affecting Propagation –
Rain Fading
•
Refers to scenarios where signal is absorbed by rain, snow, ice
•
Absorption becomes significant factor above 11GHz
•
Signal quality degrades
•
Represented by “dB/km” parameter which is related the rain
density which represented “mm/hr”
•
Rain drops falls as flattened droplet
V better than H (more immune to rain fading)
Proprietary and Confidential
Parameters Affecting Propagation –
Rain Fading
21
Heavier rain >> Heavier Atten.
Higher FQ >> Higher Attenuation
Proprietary and Confidential
Parameters Affecting Propagation –
Fresnel Zone
22
Terrain
Duct Layer0
1st 2nd 3rd TX RX1. EMW propagate in beams
2. Some beams widen – therefore, their path is longer
3. A phase shift is introduced between the direct and indirect
beam
Proprietary and Confidential
Parameters Affecting Propagation –
Fresnel Zone
•
Obstacles in the first Fresnel zone will create signals that will be 0 to 90 degrees out of phase…in the 2ndzone they will be 90 to 270 degrees out of phase…in 3rdzone,they will be 270 to 450 degrees out of phase and so on…
•
Odd numbered zones are constructive and even numbered zones are destructive.•
When building wireless links, we therefore need to be sure that these zones are kept free of obstructions.•
In wireless networking the area containing about 40-60 percent of the first Fresnel zone should be kept free.23
Proprietary and Confidential
Example: First condition
Proprietary and Confidential
RF Link Basic Components –
Parabolic Reflector Radiation (antenna)
25
Proprietary and Confidential
RSSI Curve for RFU-C
1,9V
1,6V
1,3V
-30dBm -60dbm -90dBm
Proprietary and Confidential • Standard performance antennas (SP,LP)
• Used for remote access links with low capacity. Re-using frequencies on adjacent links is not normally possible due to poor front to back ratio.
• High performance antennas (HP)
• Used for high and low capacity links where only one polarization is used. Re-using frequencies is possible. Can not be used with co-channel systems.
• High performance dual polarized antennas (HPX)
• Used for high and low capacity links with the possibility to utilize both polarizations. Re-using frequencies is possible. Can be used for co-channel systems.
• Super high performance dual polarized antennas (HSX)
• Normally used on high capacity links with the possibility to utilize both polarizations. Re-using frequencies is possible with high interference protection. Ideal for co-channel systems. • Ultra high performance dual polarized antennas (UHX)
• Normally used on high capacity links with high interference requirements. Re-using frequencies in many directions is possible. Can be used with co-channel systems.
Main Parabolic Antenna Types
27
Proprietary and Confidential
Passive Repeaters
Plane
reflector
Back-to-back
antennas
28Proprietary and Confidential
Link Calculation – Basic Example
(in vacuum)L
fs TSLGa
Lfsl
Ga
Lw
Lb
Lf
RSLRSL=TSL+Ga‐Lfsl+Ga‐Lw‐Lb‐Lf
RSL ‐ Received Signal Level TSL – Transmitted Signal Level Lfsl ‐ Free‐space loss = 92.45 + 20 log x(distance in km x frequency in GHz) Lf ‐ Filter loss Lb ‐ Branching loss Lw ‐ Waveguide loss Ga – Antenna gain 29Proprietary and Confidential
Atmospheric attenuation
]
[
dB
d
A
a
a
Starts to contribute to the total attenuation above approximately 15GHz
Parameters in
a:
Frequency Temperature Air pressure Water vapour 30Proprietary and Confidential
Objective examples
•
Typical objectives used in real systems•
99.999%
• Month: 25.9 sec • Year: 5 min 12 sec•
99.995 %
• Month: 2 min 10 sec • Year: 26 min
•
99.99%
• Month: 260 sec • Year: 51 min
• Performance requirements generally higher than Availability. • ITU use worst month for Performance Average year for Availability
31
Modulation
Proprietary and Confidential
Modulation
Modulation
Analog
Modulation
Digital
Modulation
AM - Amplitude modulation ASK – Amplitude Shift Keying FM - Frequency modulation FSK – Frequency Shift Keying PM – Phase modulation PSK – Phase Shift Keying
QAM – Quadrature Amplitude modulation
33
Proprietary and Confidential
Modem 1 0 1 1 0 1 1 0 1 0 1 1 0 1 1 0 Modem 1 0 1 1 0 1 1 0 0 1 1 1 0 1 1 F1 F2 F1 F1 F2 F1 F1 Modem 1 0 1 1 0 1 1 0 1 0 1 1 0 1 1 0 1800phase shift
ASK modulation changes the amplitude to the analog signale.”1” and “ 0” have different amplitude.
FSKmodulation is a method of represent the two binary states ”1” and ”0” with different
spcific frequencies.
PSKmodulation changes the phase to the transmitted signal. The simplest method uses 0 and 1800.
Digital modulation
Proprietary and Confidential
QAM Modulation
•
Quadrature Amplitude Modulation employs both phase modulation
(PSK) and amplitude modulation (ASK)
•
The input stream is divided into groups of bits based on the number
of modulation states used.
•
In 8 QAM, each three bits of input, which provides eight values (0-7)
alters the phase and amplitude of the carrier to derive eight unique
modulation states
•
In 64 QAM, each six bits generates 64 modulation states; in 128
QAM, each seven bits generate 128 states, and so on
4QAM
2bits/symbol
256QAM
8bits/symbol
8QAM
3bits/symbol
512QAM
9bits/symbol
16QAM 4bits/symbol
1024QAM
10bits/symbol
32QAM 5bits/symbol
2048QAM
11bits/symbol
64QAM 6bits/symbol
128QAM 7bits/symbol
35
Proprietary and Confidential
Why QAM and not ASK or PSK for higher modulation?
•
This is because QAM achieves a greater distance between adjacent points
in the I-Q plane by distributing the points more evenly
•
The points on the constellation are more distinct and data errors are
reduced
•
Higher modulation >> more bits per symbol
•
Constellation points are closer >>TX is more susceptible to noise
Proprietary and Confidential
Constellation diagram
•
In a more abstract sense, it represents the possible symbols that may be
selected by a given modulation scheme as points in the complex plane.
Measured constellation diagrams can be used to recognize the type of
interference and distortion in a signal.
37
Proprietary and Confidential
8 QAM Modulation Example
We have stream: 001-010-100-011-101-000-011-110
Bit sequence Amplitude Phase (degrees)
000 1 None 001 2 None 010 1 pi/2 (90°) 011 2 pi/2 (90°) 100 1 pi (180°) 101 2 pi (180°) 110 1 3pi/2 (270°) 111 2 3pi/2 (270°)
How does constellation diagram look?
DIGITAL QAM (8QAM)
Proprietary and Confidential
4QAM VS. 16QAM
4QAM
16QAM
39
Proprietary and Confidential
2048 QAM
Proprietary and Confidential 2-PSK 4-PSK 8-PSK 16-QAM 64-QAM Bandwidth Decreases Modulation Complixity Increases
Bandwidth vs. Modulation
41Proprietary and Confidential
Pow er Noise Signal S/N Pow er Noise S/N Signal Pow er Noise S/N Signal Pow er Noise S/N Signal • Example: S/N influence at QPSK Demodulator
• Each dot detected in wrong quadrant result in bit errors
BER=10-3 BER=10-6 BER<10-13 BER≈0
Signal / Noise
42Proprietary and Confidential 10-3 10-4 10-5 10-6 10-7 10-8 -75 -72 -69 -66
Receiver input level [dBm ]
BER change ratio vs. Noise is
dependent on Noise Power distribution
and coding
BER Impact on Transmission Quality
BER
43
Proprietary and Confidential
RSL Vs. Threshold
Thermal Noise=10*log(k*T*B*1000) S/N=23dB for 128QAM (37 MHz) BER>10-6 RSL (dBm) -20-30 Nominal Input Level
-99
-96 Receiver amplifies thermal noise
-73 Threshold level BER=10-6
Fading Margin K – Boltzmann constant T – Temperature in Kelvin B – Bandwidth Time (s) BER>10-6 44
Thank you
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Version 4
IP-20N Overview
November 2014
Proprietary and Confidential
Agenda
2
•
IP-20N Product Highlights
•
Network topology with IP-20N
•
IP-20N Overview
• 1U and 2U chassis • TCC – Traffic Control Card • RMC – Radio Modem Card • ELIC – Ethernet Line Interface Card • TDM Line cards
• IVM – Inventory Module • PDC – Power Distribution Card • Fan Module and Air Filter • RFU – Radio Frequency Unit
Proprietary and Confidential IP-10C IP-10E IP-10G
Ethernet + Optional TDM
IP-10QEthernet Only
Compact All-Outdoor Terminal / Single-Carrier Nodal Terminal / Single-Carrier Nodal AggregationFibeAir IP-10 Product Line -
2011
Optimized for “Full GE” Multi-Carrier pipes
Ultra-high density
Optimized Solution for Any Network
3
Proprietary and Confidential
IP-10C IP-10E
IP-10G
Optimized for “Full GE” Multi-Carrier pipes
Ultra-high density
Ethernet + Optional TDM
IP-10Q
Optimized Solution for Any Network
Ethernet Only
FibeAir IP-X0 Product Line - 2012
(Introducing IP-20N)
Compact All-Outdoor Terminal / Single-Carrier Terminal / Single-Carrier Aggregation Nodal IP-20N Ultra-high density/modularity 4
Proprietary and Confidential
FibeAir IP-20 Product Family
5
IP‐20
Platform
IP-20LH IP-20A= IP20N + RFU-A
Available only for US & NA market IP-20N 1RU & 2RU
IP-20G
IP-20S
IP-20C IP-20E
Proprietary and Confidential 2RU chassis, Up to 10 RFUs
Full redundancy option (No SPoF) 1RU chassis, Up to 5 RFUs
FibeAir IP-20N Product Overview
6
Unified architecture with
common cards
•
Traffic/Control cards (TCC)•
Radio interface cards (RMC)oNon-XPIC
oXPIC
o1024 QAM
•
Line cards (LIC)oEth – 4 x 1GE oTDM – 16 x E1/DS1 LIC – 1 x STM-1/OC3 LIC - 1 x ch STM-1 o LIC-X-E4-Elec./Opt Ultra-high flexibility/modularity
Optimized foot-print, density, scalability & availability
Proprietary and Confidential
FibeAir IP-20N – Product Highlights
7
• Optimized nodal solution • Multi-Carrier ABC
•1x Up to 8+0 MC‐ABC (Up to 1Gbps)
•1+1/2+2 MC‐ABC/HSB (Up to 1Gbps)
•Mixed Nx1+0/1+1 & 1x ABC (4+0) • Rich packet processing feature-set
• High Availability node
• Support for multi-operator scenarios
• Highest capacity, scalability and spectral efficiency • High precision, flexible packet Synchronization solution
• Best-in-class TDM migration solution using PWE3 (Circuit Emulation) • Support Ceragon’ s current and future RFUs
• Purpose built for supporting resilient and adaptive multi-carrier radio links scaling to GE capacity
• Future-proof with maximal investment protection
Proprietary and Confidential
FibeAir IP-20N – Carrier Ethernet Transport
Main features
•
Flexible transport•
Flexible service classification•
Full E-Line, E-LAN support•
Hierarchical QoS•
Superb (hardware based) service level OAM and SLA assurance mechanisms•
MSTP•
Enhanced <50msec network level resiliency (G.8031/2)•
Advanced L2-4 security policy (ACL) engine•
Enhanced Multicast (IGMP-snooping)•
ACM 4PSK – 1024 QAM•
LIC-T155 (1x ch-STM-1)•
LIC-STM1/OC3-RSTFuture proof architecture for supporting
backhaul evolution to emerging services
Proprietary and Confidential
Network Topology Example (Tree)
9
Proprietary and Confidential
Network Topology Example (Ring)
Proprietary and Confidential
IP‐20N
IP‐20N
IP‐20N
IP‐20G
Network Topology Example (Tree)
11 C C C C C C C 1+1 C RFU-C 2+0 1+1 C IP‐10G C C IP‐20G C C 1+0 1+0 2+0 IP‐10G C C 1+0 C 2+0 C C 1+0 IP‐20N C
Proprietary and Confidential
IP‐20N IP‐20N Edge Router Edge Router 10GE Fiber Ring IP‐20N IP‐20N
IP‐20G IP‐20G IP‐20N
IP‐20N IP‐10G IP‐20N IP‐20N IP‐20N IP‐10G
Reference Integrated CET solution
12 IP‐20N 1+0 C C C C C C C C 4+0 Microwave Ring 1+0 C E1s Eth E1s Eth E1s Eth E1s Eth E1s Eth C C C E1s Eth E1s Eth C C E1s Eth 2+2 1+1 2+2 C C C C C C C C 1+1 C RFU-C 4+0 4+0 4+0 4+0 4+0 C 1+0 Eth C IP‐20C E1s Eth E1s Eth
IP-20N Overview
13
Proprietary and Confidential
IP-20N – 2RU Chassis
14
10 x Universal slots for: - Radio interface cards (RMC) - Ethernet line cards (4 x GE) - TDM line cards Fans tray Filter tray (optional) 2 x Slots for power distribution cards (PDC) 2 x Slots for Main traffic and control cards (TCC)
1
2
3
4
5
6
7
8
9
10
Proprietary and Confidential
Slots Numbering
152
12
6
10
5
9
4
8
3
7
11
1
Slots Numbering starts from bottom left
2
6
5
4
3
1
50
51
51
Proprietary and Confidential
Card types allowed per slot – 1RU
16
Slot Number
Slot Number
Allowed Card Type Notes
1 TCC 2 RMC
Ethernet – LIC-X-E4-Elec (4x GE) Ethernet – LIC-X-E4-Opt (4x GE) TDM– LIC-T16 (16x E1) TDM– LIC-T155 (1x ch-STM-1) 3-6 RMC TDM– LIC-T16 (16x E1) TDM– LIC-T155 (1x ch-STM-1) TDM –LIC-STM1/OC3-RST
Proprietary and Confidential
Card types per slot – 2RU
17
Slot Number
Allowed Card Type Notes
1 TCC 2,12 RMC
Ethernet – LIC-X-E4-Elec (4x GE) Ethernet – LIC-X-E4-Opt (4x GE) TDM– LIC-T16 (16x E1) TDM– LIC-T155 (1x ch-STM-1) 3 - 10 RMC TDM– LIC-T16 (16x E1) TDM– LIC-T155 (1x ch-STM-1) TDM –LIC-STM1/OC3-RST 11 TCC
Proprietary and Confidential
Recommendations
18
It is recommended to place the same type of cards in adjacent pairs, as follows: • Slots 3 and 4
• Slots 5 and 6
• Slots 7 and 8 (2RU only) • Slots 9 and 10 (2RU only)
The reason for this is that for certain features, connectivity is supported in the backplane between these slot pairs
For example 2+2 HSB SD configuration with XPIC: • 1+1 or 2+2 are supported in release 7.9
• When combining HSB SD and XPIC, the HSB SD protection group and the XPIC group cannot be identical. A valid combination would be:
XPIC Group #1: Slot 3 and 4 XPIC Group #2: Slot 5 and 6
Radio Protection Group #1: Slot 3 and 5 Radio Protection Group #2: Slot 4 and 6
Proprietary and Confidential
Traffic – Ethernet Matrix
19
Slot 7
Slot 8
Slot 9
Slot 10
Slot 3
Slot 4
Slot 5
Slot 6
TCC Slot 1
Slot 2
Slot 12
TCC Slot 11
SGMII to TCC primary SGMII to TCC backup
Proprietary and Confidential
Supported Configurations in T7.9
20 Configuration Notes 1+0 1+0 IF Combining Requires RMC‐B and 1500HP 2+0 Single Polarization Requires Multi‐Carrier ABC or LAG. 2+0 Dual Polarization (XPIC) Requires Multi‐Carrier ABC. 3+0 Requires Multi‐Carrier ABC or LAG. 4+0 Single Polarization Requires Multi‐Carrier ABC or LAG. 4+0 Dual Polarization (XPIC) Requires Multi‐Carrier ABC. 4+0 IF Combining Requires Multi‐Carrier ABC and 1500HP. 4+0 IF Combining and XPIC Requires Multi‐Carrier ABC and 1500HP. 5+0 Single Polarization Requires Multi‐Carrier ABC or LAG. 6+0 Single Polarization Requires Multi‐Carrier ABC or LAG. 7+0 Single Polarization Requires Multi‐Carrier ABC or LAG. 8+0 Single Polarization Requires Multi‐Carrier ABC or LAG. 1+1 HSB Protection 1+1 HSB Protection with BBS Space Diversity Requires Multi‐Carrier ABC 2+2 HSB Protection Requires Multi‐Carrier ABC 2+2 HSB Protection with BBS Space Diversity Requires Multi‐Carrier ABC 2+2 HSB Protection with XPIC Requires Multi‐Carrier ABC 2+2 HSB Protection with BBS Space Diversity and XPIC Requires Multi‐Carrier ABC 2+2 HSB Protection with IF Combining and XPIC Requires Multi‐Carrier ABC and 1500HPTCC – Traffic control card
21
Proprietary and Confidential
Traffic Control Card (TCC)
22
• Main functions:
• TCC-B – doesn’t support Multi-Carrier ABC, HSB support
• TCC-B-MC – required for Multi-Carrier ABC configurations, HSB BBS SD support •1x Up to 8+0 MC‐ABC (Up to 1Gbps)
•1+1/2+2 MC‐ABC/HSB (Up to 1Gbps)
•Mixed Nx1+0/1+1 & 1x ABC (4+0)
• Network processor with 16 ports • 10 Gbps switching capacity
• 6,25 Mpps (Mega packet per second) switching capacity • Shelf control and management
• Ethernet traffic management and switching • Clock unit
Industrial SD card 1GB class 6
Ceragon SD cards with Cera OS:
1 11
Proprietary and Confidential 23
Ethernet Switch
16 ports – 10GbpsCPU
MNG port 1 MNG port 2Line Interface 1Gb SGMII / (2.5Gb)
Line Interface 1Gb SGMII / (2.5Gb)
1Gb SGMII / (2.5Gb) 1Gb SGMII / (2.5Gb) 1Gb SGMII / (2.5Gb) 1Gb SGMII / (2.5Gb) 1Gb SGMII / (2.5Gb)
Radio Card
Ethernet Card
2 3 4 5 6 7 8 9 10 12Proprietary and Confidential
TCC Indicators & Connectors
24
Handle
SYNC
Port
External
Alarms
Port
Serial
Port
Management
Ports
Gigabit
Electrical Ports
Gigabit Optical
Ports
Handle
Activity
LED
1 11 1Proprietary and Confidential
TCC card – Interfaces pin out
25
RMC – Radio Modem Card
Proprietary and Confidential
Radio Modem Cards (RMC)
27
•
RMC-A• Based on Ceragon’s well known SoC modem • Supports up to 256QAM
• FibeAir IP-10 Series support across a link
•
RMC-B• Based on Ceragon’s new SoC modem • Supports up to 1024QAM
• Supports XPIC and non XPIC (same Hardware) • Supports Header De-Duplication
RMC A RMC B
XPIC No Yes
Multi‐Carrier ABC No Yes
Modem type PVG modem Mars modem
Modulation 256 QAM + ACM 1024 QAM with Premium RFU + ACM
FD and SD Yes Yes
IP20 communication with
IP10 across a link Yes No
2
3 4 5 6
7 8 9 10
12
Proprietary and Confidential
Radio Modem Cards (RMC) and RFUs combinations
28
Combination Multi – Carrier ABC De‐ DuplicationXPIC & Header Max available Modulation
IP‐20N communication with IP‐10 across a radio link IP‐20N communication with IP‐20G RMC‐A & RFU
standard No No 256 QAM Yes No
RMC‐A & RFU
premium No No 256 QAM Yes No
RMC‐B & RFU
standard Yes Yes 256 QAM No Yes
RMC‐B & RFU‐
premium Yes Yes 1024 QAM No Yes
2
Proprietary and Confidential
Radio Modem Cards (RMC-E)
29
RMC-E is used for IP-20LH with Evolution radio. This card has Radio Interface and STM-1 RST Interface
2
3 4 5 6
7 8 9 10
12
Proprietary and Confidential
RMC Indicators & Connectors
30 Handle IF Connector ACT LED RFU LED LINK LED Handle
Color ACT LINK RFU
off No power No power No power
green OK, active mode Link OK no alarms RFU is OK yellow OK, standby mode Minor or warningalarm Minor or warningalarm
red failure Critical or major alarm Critical or major alarm 2
3 4 5 6
7 8 9 10
ELIC – Ethernet Line Interface Cards
31
Proprietary and Confidential
Ethernet Line Interface Card
Electrical LIC-XE4-Elec
32
•
LIC-XE4-Elec
• Supports 4 GBE ports (one combo)
• Works only on slots 2 and 12
• MDI/MDIX support
• Cascading ports (port 3 & 4)
2 12
Proprietary and Confidential
LIC-XE4-Elec
Indicators & Connectors
33
Handle Handle
ACT LED
Gigabit Electrical Ports
Color ACT Left LED for port Right LED for port SFP LED
off No power Interface is disabled
Interface is disabled or the interface operates at 100BaseT mode Cable not connected, link not ok, interface is disabled green OK, no alarms the interface is enabled and link is OK (Blinking = traffic activity) Interface operates at 1000BaseT mode, Blinking means operates at 10BaseT mode Interface is enabled and link is OK, blinking means traffic activity
red Card failure orhardware failure ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐
SFP LED SFP Slot 2 12
Proprietary and Confidential
Ethernet Line Interface Card
Optical LIC-XE4-Opt
34
•
LIC-XE4-Opt
• Supports 4 GBE ports (firs port is combo)
• Total 4x SFP
• Works only on slots 2 and 12
• Cascading ports (port 3 & 4)
2 12
Proprietary and Confidential
LIC-XE4-Opt
Indicators & Connectors
35
Handle Handle
ACT LED
Gigabit Optical Ports
Color ACT Left LED for port Right LED for port SFP LED
off No power Interface is disabled
Interface is disabled or the interface operates at 100BaseT mode Cable not connected, link not ok, interface is disabled green OK, no alarms the interface is enabled and link is OK (Blinking = traffic activity) Interface operates at 1000BaseT mode, Blinking means operates at 10BaseT mode Interface is enabled and link is OK, blinking means traffic activity
red Card failure orhardware failure ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐
SFP LED Gigabit Electrical port 2 12
TDM Line cards
36Proprietary and Confidential
LIC-T16 (16xE1/DS1)
Line Interface Card
37
•
TDM-LIC
• 16 E1/T1s
• 1588 client clock and boundary clock as a future option
2
3 4 5 6
7 8 9 10
12
Proprietary and Confidential
LIC-T16 (16xE1)- Indicators & Connectors
38
Handle Handle
ACT LED
16 x E1/ DS1 Connector
E1/DS1LED
Color ACT Sync Left LED for port Sync Right LED for port E1/DS1 LED off No power The interface is disabled or no signal is being received The interface is disabled The interface is disabled green OK, no alarms Indicates whether a valid signal is being received when enabled Indicates whether the interface is configured to export a clock No alarms
red Card failure orhardware failure ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Any alarms SYNC Connector
2
3 4 5 6
7 8 9 10
Proprietary and Confidential
LIC-T16 (16xE1)
Connector and Synchronization Interface
39
2
3 4 5 6
7 8 9 10
12
Proprietary and Confidential
TDM LIC-T155 (1x ch-STM-1)
40
•
TDM-LIC
• 1 STM-1/OC3
• 1588 client clock and boundary clock as a future option
• The 1 x ch-STM-1 interface uses an optical SFP connector.
2
3 4 5 6
7 8 9 10
Proprietary and Confidential
TDM LIC-T155 (1x ch-STM-1)
Indicators & Connectors
41 Handle Handle ACT LED STM-1/OC3 SFP STM-1/OC3 LED SYNC Connector
Color ACT Sync Left LED for port Sync Right LED for port STM1/OC3 off No power The interface is disabled or no signal is being received The interface is disabled The interface is disabled green OK, no alarms Indicates whether a valid signal is being received when enabled Indicates whether the interface is configured to export a clock No alarms
red Card failure orhardware failure ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Any alarms 2
3 4 5 6
7 8 9 10
12
Proprietary and Confidential
TDM LIC-STM-1/OC3-RST
42 2 3 4 5 6 7 8 9 10 12Inventory Module (IVM)
43
Proprietary and Confidential
Mandatory Cards - IVM
44
•
Single card for 1RU and 2RU chassis.
•
2 x E2PROM on single board (function as 2 separated cards).
•
Installed at the back of the chassis
•
Holds the chassis:
• License.
• Node MAC address (48 MACs per unit).
• Serial number.
Proprietary and Confidential
IVM – Inventory Module
45
The IVM contains pre-programmed information that defines the chassis and its slots, including:
• Module types that can be inserted into the chassis, per slot • Product and card names
• Internal MAC addresses • Serial number
• Hardware versions
• Licensed features and capacities
The IVM stores information in a 8 KB (64 kb) EEPROM. A 2RU IP-20N IVM contains two EEPROMs. If a redundant TCC configuration is used, each EEPROM is dedicated to a specific TCC
IVM
EEPROM TCC 2 EEPROM TCC 1PDC – Power Distribution Card
Proprietary and Confidential
Mandatory Cards – PDC
Power Distribution Card
47
•
Monitors the inputs signal
•
Drives the -48V signal
•
Converts the -48V signal to other power levels
•
Different card for 1RU chassis and 2RU chassis
• 2U chassis uses two PDC card for redundancy
• 1U chassis uses dual input for redundancy
Proprietary and Confidential
Power Distribution Card
•
A 2RU IP-20N can use two PDC cards for redundancy. Each PDC provides 48V power to all modules in the chassis via the backplane, on different lines.•
A diode bridge in the modules prevents power spikes and unstable power from the two power sources.•
Voltage range: -40,5 VDC to -60 VDC•
The maximum rating of the overcurrent protection shall be 3 Amp per link, while the maximum current rating is 9A for 1RU and 17Amp for 2RU•
The power source must be grounded•
If the voltage goes below 38V, the LED displays Red. When the voltage returns to -40V or higher, the Red indication goes off and the Green indication reappears.48
Proprietary and Confidential
Power consumption specification
49
Fans Module & Air Filter
Proprietary and Confidential
Mandatory Cards – Fans
51
•
Four fans inside the fans module
•
Powered up from -48VDC from the backplane
•
Different module for 1RU and 2RU chassis
Proprietary and Confidential
Filter Tray - optional
52
• IP-20N offers a filter as optional equipment. If a filter tray is not ordered, the IP-20N chassis is delivered with a blank filter slot cover.
IP-20N Block diagram
53
Proprietary and Confidential
IP-20N –
B
lock Diagram
Proprietary and Confidential
Traffic Path vs Internal Shelf Management Path
55
Proprietary and Confidential
Traffic Path vs Internal Shelf Management Path
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April 2014
Radio Frequency Units
V1
1
Proprietary and Confidential
Agenda
2
•
Radio Frequency units for IP-20N
•
RFU Selection Guide
•
RFU-C
•
1500HP / RFU – HP
•
Split Mount Configuration and Branching
•
New Outdoor Circulator Block OCB
•
Split Mount Configurations
Proprietary and Confidential
Radio Frequency units
3
•
Standard Power
• FibeAir RFU-C
•
High Power
• FibeAir 1500HP
• FibeAir RFU-HP
•
The following RFUs can be installed in a split-mount configuration: • FibeAir RFU-C (6–42 GHz)• FibeAir 1500HP RFU-HP (6–11 GHz) • RFU-HP (6–8 GHz)
•
The following RFUs can be installed in an all-indoor configuration: • FibeAir 1500HP/RFU-HP (6–11 GHz)•
The IDU and RFU are connected by a coaxial cable RG-223 (up to 100 m/300 ft), Belden 9914/RG-8 (up to 300 m/1000 ft) or equivalent, with an N-type connector (male) on the RFU and a TNC connector on the RMC in the IP-20N chassis.Proprietary and Confidential
Ultra High Power (Max 33 dbm)
6-8 GHz
3.5-56Mhz Ch. Bandwidth Low Loss Chaining QPSK-1024QAM
Reduced Power Consumption Mode (Green Mode)
Standard Power (Max 24 dbm) 6-38 GHz
3.5-56Mhz Ch. Bandwidth QPSK-1024QAM Very Compact
4
FibeAir
®
Radio Frequency Units
FibeAir RFU-C
FibeAir RFU-HP -1RX
High Power (Max 33 dbm)
6-11 GHz
3,5-56Mhz Ch. Bandwidth QPSK-1024QAM Low Loss Chaining
Dual RX with IFC (Single Rx available for 11GHz)
Proprietary and Confidential
RFU Selection Guide
5
Character
1500HP/RFU‐HP (6 – 11 GHz) RFU‐C (6 – 42 GHz) RFU‐Ce (6 – 42 GHz) Installation Type Split Mount √ √ √ All‐Indoor √ Configuration 1+0/2+0/1+1/2+2 √ √ √ N+1 √ N+0 ( N>2) √ SD support √ (IFC, BBS) √ (BBS) √ (BBS) Power Saving Mode Adjustable Power Consumption √ Modulation QPSK to 256 QAM √ √ √
512 to 1024 QAM √ √
RFU-HP does not support 56 MHz channels.
IFC at 40MHz is supported only for the 11GHz frequency band.
RFU – C
Proprietary and Confidential
RFU – C
6-42GHz
• Standard RFU – C
• Support up to 256 QAM modulation • RMC-A or RMC-B
• Premium RFU-Ce
• Support up to 1024 QAM modulation • RMC-B is required
• Main Features of RFU-C:
• Frequency range – Operates in the frequency range 6 – 42 GHz
• More power in a smaller package - Up to 26 dBm for extended distance, enhanced availability, use of smaller antennas
• Configurable Modulation – QPSK – 1024 QAM • Configurable Channel Bandwidth – 3.5 MHz – 56MHz
• Compact, lightweight form factor - Reduces installation and warehousing costs • Supported configurations: • 1+0 – direct and remote mount • 1+1 – direct and remote mount • 2+0 – direct and remote mount • 2+2 – remote mount • 4+0 – remote mount • Efficient and easy
7
Proprietary and Confidential
Example of RFU-C direct 1+1 mount configurations
1+1 direct
Proprietary and Confidential
Orthogonal Mode Transducer (OMT) Installation for 2+0
Configuration
9
Switch to the circular adaptor (removing the
existing rectangular transition, swapping the O-ring, and replacing on the circular transition).
Proprietary and Confidential
OMT Installation Example
10
1500HP / RFU–HP
11
Proprietary and Confidential
Main Features of 1500HP/RFU-HP
• Frequency range: • 1500HP 2RX: 6-11GHz • 1500HP 1RX: 11GHz • RFU-HP: 6-8GHz • Frequency source – Synthesizer
• Installation type – Split mount – remote mount, all indoor (No direct mount)
• Diversity – Optional innovative IF Combining Space Diversity for improved system gain (for 1500HP), as well as BBS Space Diversity (all models)
• High transmit power – Up to 33dBm in all indoor and split mount installations
• Configurable Modulation – QPSK – 1024 QAM
• Configurable Channel Bandwidth – • 1500HP 2RX (6-11 GHz): 10-30 MHz • 1500HP 1RX (11 GHz): 10-30 MHz • 1500HP 1RX (11 GHz wide): 24-40 MHz • RFU-HP 1RX (6-8GHz): 3.5-56 MHz
• System Configurations – Non-Protected (1+0), Protected (1+1), Space Diversity, 2+0/2+2 XPIC, N+0, N+1
• XPIC and CCDP – Built-in XPIC (Cross Polarization Interference Canceller) and Co-Channel Dual Polarization (CCDP) feature for double transmission capacity, and more bandwidth efficiency
• Power Saving Mode option - Enables the microwave system to automatically detect when link conditions allow it to use less power (for RFU-HP)
• Tx Range (Manual/ATPC) – Up to 20 dB dynamic range
• ATPC (Automatic Tx Power Control)
• RF Channel Selection – Via EMS/NMS
• NEBS – Level 3 NEBS compliance
Proprietary and Confidential
1500 HP 2RX in 1+0 SD Configuration
13
Proprietary and Confidential
1500 HP 1RX in 1+0 SD Configuration
Proprietary and Confidential
RFU-HP 1RX in 1+0 SD Configuration
15
Proprietary and Confidential
HP Comparison Table
16
Feature 1500HP 2RX 1500HP 1RX RFU‐HP Notes
Frequency Bands Support 6L,6H,7,8,11GHz 6L,6H,7,8,11GHz 6L,6H,7,8GHz
Channel Spacing Support Up to 30 MHz 11 GHz version for Up to 30 MHz 40 MHz
Up to 60 MHz
Split‐Mount √ √ √ All are compatible with OCBs from both generations All‐Indoor √ √ √ All are compatible with ICBs Space Diversity BBS and IFC BBS BBS BBS ‐ Base Band SwitchingIFC ‐ IF Combining
Frequency Diversity √ √ √ 1+0/2+0/1+1/2+2 √ √ √ N+1 √ √ √ N+0 ( N>2) √ √ √ High Power √ √ √ Remote Mount Antenna √ √ √
Power Saving Mode ‐‐ ‐‐ √ Power consumption changes with TX power
Split Mount Configuration and Branching
Proprietary and Confidential
Split Mount Configuration and Branching Network
18
• Outdoor Circulator Block OCB – The Tx and the Rx path circulate together to the main OCB port. When chaining multiple OCBs, each Tx signal is chained to the OCB Rx signal and so on (uses S-bend section). For more details, refer to 1500HP/RFU-HP OCBs
• Indoor Circulator Block ICB – All the Tx signals are chained together to one Tx port (at the ICC) and all the Rx signals are chained together to one Rx port (at the ICC). The ICC circulates all the Tx and the Rx signals to one antenna port.
Proprietary and Confidential
19
Split Mount Configuration and Branching Network
All- Indoor Vertical Branching Split-Mount Branching and All Indoor Compact
New OCB
Proprietary and Confidential
21
New OCB – Outdoor Circulator Block
The OCB has the following main purposes:
1. Hosts the circulators and the attached filters.
2. Chain and accumulate radio signal ( multiple carriers )
3. Routes the RF through the filters and circulators.
4. Allows RFU connection to the Main and Diversity antennas.
Proprietary and Confidential
New OCB Components
22
• RF Filters - are used for specific frequency channels and Tx/Rx separation. The filters are attached to the OCB, and each RFU contains one Rx and one Tx filter. In a Space Diversity using IF combining configuration, each RFU contains two Rx filters (which combine the IF signals) and one Tx filter. The filters can be replaced without removing the OCB. The RF filter is installed with every configuration.
• DCB - Diversity Circulator Block An external block which is added in Space Diversity configurations. DCB is connected to the diversity port and chains two OCBs.
• Coupler Kit is used for 1+1 Hot Standby configurations. (loss 1.6 /6dB)
• Symmetrical Coupler Kit is used for: (loss of 3/3 dB) • When chaining adjacent channels (only 28/30 MHz) • 1+1 Hot Standby configurations with a symmetrical loss of 3dB in each direction Note: CPLRs loss tolerance is ±0.7 dB
• U Bend The U Bend connects the chained DCB (Diversity Circulator Block) in N+1/N+0 configurations.
• S Bend The S Bend connects the chained OCB (Outdoor Circulator Block) in N+1/N+0 configurations.
• Pole Mount Kit The Pole Mount Kit is used to fasten up to five OCBs and the RFUs to the pole. The kit enables fast and easy installation.
Proprietary and Confidential
1+1 and 2+2 HSB Configuration
23
Proprietary and Confidential
N+0/N+1 Configuration
Proprietary and Confidential
2+0 XPIC
25
Proprietary and Confidential
Split mount applications
Proprietary and Confidential
Split mount applications 4+0
S-Bend
27
Proprietary and Confidential
Split mount applications 4+0 SD
S-Bend
U-Bend
DCB DCB
Proprietary and Confidential
Green Mode
Significant Power Consumption Reduction
29
•
Minimal power consumption required in 99.9% of the time•
Green Mode enables:• Reduction of consumed powerby automatically reducing Tx power • Quick increase in Tx Power in case of fading.
• No traffic impact Power Consumption Level Max. Tx Power (@ 128QAM) Power Consumption High 31dBm 80W Mid 27dBm 56W Low 21dBm 41W
Automatic TX Power control for optimal power
consumption
Proprietary and Confidential
Green Mode (RFU-HP)
Significant Power Consumption Reduction
30 80W 56W 41W 31dBm 27dBm 21dBm
Proprietary and Confidential
Power Consumption VS. Monitored TSL
31
Power State
Monitored TX
Power
Consumed
power [W]
HIGH
31dBm
80 Watt
MEDIUM
27dBm
56 Watt
LOW
21dBm
41 Watt
* X<Y<Z
The radio operates in fixed and pre-defined
power-consumption states:
Transition between power states is hitless and
errorless !
Proprietary and Confidential
Normal ATPC
32
RX: ‐41dBm
Reference level: ‐40dBm
Set “reference level” Remote TX changes accordingly
0 dB
5 dB
15 dB
10 dB
When fading occurs, both transmitters try to
compensate for the losses by increasing
transmission power while maintaining RSL as
close as possible to the Ref. level
Proprietary and Confidential
GREEN MODE
33
RX: ‐37dBm
Green level: ‐50dBm
Set
“Green Mode”
enable
Set
“Green RSL”
limit [dBm]
0 dB
5 dB
15 dB
10 dB
RX: ‐42dBm
Green level: ‐50dBm
RX: ‐47dBm
Green level: ‐50dBm
RX:
‐52dBm
Green level: ‐50dBm
When fading occurs, both transmitters
compare the monitored RSL with the Green
Level (Ref.). As long as RSL> Ref. there is no
need to increase the TSL.
setting the Green RSL to -50dBm doesn’t degrade fade margin, as the mechanism will increase TX power if
necessary.
Proprietary and Confidential
GREEN MODE
3415 dB
RX:
‐52dBm
Green level: -50dBm
RX: ‐50dBm
Green level: -50dBm
When RSL drops below the Green Ref. level,
we must increase the TSL to maintain the
fade margin and avoid low sensitivity
Set
“Green Mode”
enable
Set
“Green RSL”
limit [dBm]
setting the Green RSL to -50dBm doesn’t degrade fade margin, as the mechanism will increase TX power if
October, 2014 v2
First login
Ceragon Training Services
Proprietary and Confidential
Agenda
2
•
CLI and Web login
•
General commands
•
Get IP address
•
Set IP address
Proprietary and Confidential
Connecting to the Unit
3
CLI
Web/Telnet
Default Username/password is admin/admin
Baud rate = 115200
Data bits: 8
Parity: None
Stop bits: 1
Flow Control: None
IP address = 192.168.1.1
Proprietary and Confidential
General commands
4
Press twice the TAB key for optional commands in actual directory Use the TAB key to auto-complete a syntax
Use the arrow keys to navigate through recent commands
Proprietary and Confidential
Get IP address
5
CLI Command:
“platform management ip show ip-address”
Proprietary and Confidential
Changing Management IP Address
6
•
CLI Command:
“platform management ip set ipv4-address <IP Address> subnet <Mask>
gateway <default gateway>”
•
Example
•
Web
expand Platform branch, then Management branch and click on IP, set
accordingly and click Apply button
Proprietary and Confidential
Set to default
7
•
CLI Command:
“platform management set-to-default”
Please note that IP address after Set to Factory Default will be not changed!!!
Proprietary and Confidential
Other CLI commands
8
•
For any CLI commands please follow our Web Manual
•
Open Index html file
Web Management
9
Proprietary and Confidential
First Web login
10
Default IP address is 192.168.1.1 /24
Proprietary and Confidential
Set to factory default
11
1
2
3
Please note that IP address after Set to Factory Default will be not changed!!!
Proprietary and Confidential
IP address settings
12
1
2 – select IPv4 or IPv6
Proprietary and Confidential
Web configuration manual
13
•
For any CLI commands please follow our Web Manual
•
Open Index html file
•
Find out in Topics submenu required configuration
This page was intentionally left blank.
Version 2
Shelf Management
October 2014
Proprietary and Confidential
Connecting to the Unit
2
CLI
Web
Default Username/password is admin/admin
IP address = 192.168.1.1
Baud rate = 115200
Data bits: 8
Parity: None
Stop bits: 1
Flow Control: None
Proprietary and Confidential
Chassis Configuration Window
3
Navigation Tree
Configuration Area
Selection Area
Proprietary and Confidential
Configuring the Chassis (1/2)
Proprietary and Confidential
Configuring the Chassis (2/2)
5
Proprietary and Confidential
Questions?
Version 3
ACM – Adaptive Coding and Modulation
MSE – Mean Square Error
November 2014
Proprietary and Confidential
Agenda
2
•
Adaptive Coding and Modulation
•
Using MSE with ACM
•
What is MSE?
•
Link Commissioning with MSE
•
Triggering ACM with MSE
•
ACM Benefits
Proprietary and Confidential
3
Adaptive Coding and Modulation (ACM)
• In ACM mode, the radio will select the highest possible link capacity based on received signal quality. • When the signal quality is degraded due to link fading or interference, the radio will change to a more robust
modulation and link capacity is consequently reduced.
• When signal quality improves, the modulation is automatically increased and link capacity is restored to the original setting. The capacity changes are hitless (no bit errors introduced).
• During the period of reduced capacity, the traffic is prioritized based on Ethernet QoS - and TDM priority - settings. • In case of congestion the Ethernet or TDM traffic with lowest priority is dropped. TDM capacity per modulation
state is configurable as part of the TDM priority setting.
3
Proprietary and Confidential
Hitless and Errorless switching
Using MSE with ACM
Proprietary and Confidential
MSE - Definition
6
MSE is used to quantify the difference between an estimated
(expected) value and the true value of the quantity being
estimated
MSE measures the average of the squared errors:
MSE is an aggregated error by which the expected value differs
from the quantity to be estimated.
The difference occurs because of randomness or because the
receiver does not account for information that could produce a
more accurate estimated RSL
Proprietary and Confidential
To simplify….
7
Imagine a production line where a machine needs to insert
one part into the other
Both devices must perfectly match
Let us assume the width has to be 10mm wide
We took a few of parts and measured them to see how
many can fit in….
Proprietary and Confidential
The Errors Histogram
(Gaussian probability distribution function)
8
To evaluate how accurate our machine is, we need to know how many
parts differ from the expected value
9 parts were perfectly OK
10mm 12mm 16mm 6mm 7mm
width
Quantity
3
2
3
1
9
Expected value
Proprietary and Confidential
The difference from Expected value…
9
To evaluate the inaccuracy (how sever the situation is) we
measure how much the errors differ from expected value
10mm 12mm 16mm 6mm 7mm width Quantity Error = + 6 mm Error = - 3 mm Error = + 2 mm Error = 0 mm Error = - 4 mm
Proprietary and Confidential
Giving bigger differences more weight than smaller
differences
10
We convert all errors to absolute values and then we square them
The squared values give bigger differences more weight than smaller differences,
resulting in a more powerful statistics tool:
16cm parts are 36 ”units” away than 2cm parts which are only 4 units away
10mm 12mm 16mm 6mm 7mm width Quantity + 6 mm = 36 -3 mm = 9 + 2 mm = 4 Error = 0 mm - 4 mm = 16