telecommunications network technologiescurrent status of indoor optical fiber installation in piping...
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Telecommunications Network Technologies
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NGN End-to-end Network QoS Measurement System
Application–network Collaboration in IP-optical Networks
MSPP-Type1 System for Building High-reliability and Economical Networks
Thin and Low-friction Indoor Optical Fiber
Internet-connection Service for Tokaido Shinkansen Bullet Trains
69.1-Tbit/s Optical Transmission Technology Using Digital Coherent Multilevel QAM Format
Wide-area Ubiquitous Network that Allows Communication with Objects
Contents
What’s Hot in R&D
Technologies for establishing a base network infrastructure including optical networks, wireless and satellite, all of which are essential to guaranteed bandwidth and broadband telecommunication.
Copyright © 2010 NTT
NTT Research and Development 2010 Review of Activities
What’sHot in R&D Telecommunications Network Technologies
H-NW-1
Complying with interface specifications for next-generation networks (NGNs*1), a system thatcan simply measure particular end-to-end network performance in various QoS*2 classes byconnecting it with UNI*3 points was developed. Equipped with a remote control function andan automatic measurement and acquisition function, it can monitor the quality of NGNs fromthe user’s viewpoint without taking time from network operations. This system has beencommercialized by NTT Group companies granted the rights to technical disclosure andcommercially launched as a maintenance system for the FLET’S HIKARINEXT*4.
■ Compliance with various protocols (SIP*5, DHCP*6, etc.) used in NGNs■ Executable as a HGW*7 function, session request, virtual-packet generation, or a
series of operations for QoS measurements■ Application traffic for handling various QoS classes is simulated■ Functions for measuring packet-transfer delay, delay variation, packet loss, call-set-
up-delay, etc. are enabled■ Improved efficiency by central control of measurement automatically and remotely
from the control server, and results-collection function
Overview
Features
Application scenarios
*1 NGN: Next-Generation Network *2 QoS: Quality of Service *3 UNI: User-Network Interface*4 FLET’S HIKARI NEXT is a registered trademark of Nippon Telegraph and Telephone East
Corporation and Nippon Telegraph and Telephone West Corporation.*5 SIP: Session-Initiation Protocol *6 DHCP: Dynamic Host-Configuration Protocol*7 HGW: Home GateWay
■ Operation and administration tasksof NGNs- Understanding of trends and degradation of quality by means of periodic measurement
of end-to-end QoS- Detection of “silent faults” byend-to-end QoS monitoring- Verification of effect onnetwork QoS when faults occur
■ Operation and administration business of IP telephonyservices provided byNGNs
NGN End-to-end Network QoS Measurement System NTT Service Integration Laboratories
Next-generation network, End-to-end QoS, IP network QoS measurement
* SIP-UA: SIP-User Agent
SIP server
IP-packet-transfer-performance measurementfunction and call-set-up-delay measurement function in compliance with QoS regulations such as international standards and domestic ministerial ordinances
UNI
Remote-control function for managing probes according to preset measurement schedule
Activeprobe
Activeprobe
Activeprobe
UNI
UNI
Traffic-generation function for emulating various QoS classes and application-traffic patterns
Remote control via FLET’S VPN service, etc.
Next-generation network (NGN)
Control server
UNI
HGW emulation function and SIP-UA*
function for executing QoS-class-based active measurement between UNIs of a NGN
Copyright © 2010 NTT
NTT Research and Development 2010 Review of Activities
What’sHot in R&D Telecommunications Network Technologies
H-NW-2
Video gateway
CPU resource
HDTV monitor
Network typeencoder
Technologies for streaming video over Internet protocol (IP) networks are showingremarkable evolution in the world. In particular, the transmission of high-resolution videosuch as high-definition television (HDTV) is attracting high-end users such as broadcastingstudios. We have developed (1) on-demand circuit setup and (2) adaptive codec selectionaccording to circuit availability. These were achieved through collaboration between thevideo transmission application and the IP-optical traffic engineering (TE) server managingthe network and controlling the path setup.
■ Gigabit-per-second-class circuits provided by managing optical network resources■ Selection of video codec and error correction scheme according to network status
(bandwidth, latency, jitter, and packet loss rate)■ CPU (central processing unit) resources for encoding and decoding provided by the
network■ Dynamic optimization of circuit routes in response to changes in traffic conditions
Overview
Features
Application scenarios
■ Live video transmission from location sitestobroadcasting studios■ Transmission of video raw material between studios for editing■ Videoconferencing and remote monitoring■ Telemedicine and e-learning
Application–network Collaboration in IP-optical NetworksNTT Network Service Systems Laboratories, NTT Network Innovation Laboratories
Uncompressed video transmission, GMPLS, Network virtualization
Video gateway
CPU resource
HDTV camera
IP-optical TE server(path calculation, setup, traffic measurement)
- Network sets up the circuit on-demand upon request from the application.- Application selects codec adaptively according to circuit availability.
IP-optical network
Circuit setup request
Path configuration
Dynamic route optimization
Broadcasting studios
Network typeencoder
Copyright © 2010 NTT
NTT Research and Development 2010 Review of Activities
What’sHot in R&D Telecommunications Network Technologies
H-NW-3
LSIF
This system can efficiently mix and multiplex signals of high-speed/broadband Ethernetsystems and STM*1 systems (up to 10-Gbit/s class) up to 40 Gbit/s, so it dramatically reducestransmission costs. It also provides—as a world’s first—a 10/40 G-class large-capacity high-reliability protection function, and relief in response to transmission-channel blockages andobstructed transfers becomes possible without affecting traffic. By applying this system, itbecomes possible toconstruct a high-reliabilityand economic ultra-high-speed network.
■ Large-volume traffic (40 G) is relieved by applying high-reliability protection onoccurrence of transmission-channel blockage and obstructed transfer.
■ Reduction of maintenance work by 10/40 G-class large-capacity high-reliabilityprotection function
■ Mixed multiplex transmission of Ethernet-system/STM-system signals up to 40 G ismade possible by VCAT*2 technology.
■ 10 GbE 100%-wire rate transmission is made possible by VCAT technology.
Overview
Features
Application scenarios
*1 STM: Synchronous Transport Module*2 VCAT: Virtual Concatenation
■ High-reliability40 G-class backboneoptical networks■ High-reliability leased-lineservices
MSPP-Type1 System for Building High-reliability and Economical NetworksNTT Network Service Systems Laboratories
40 G, High-reliability protection, VCAT
Operation system■Network Configuration
MSPP-Type1
DWDM systemRouter, etc.
Leased line
Router, etc.
Leased line
MSPP-Type1
Secondary line
Primary line
40 G 40 G
■Main features
HSIF
XC
HSIF
・・・
LSIF
High-reliability-path provision zoneSecondary path
Primary path
Protection (VC path) Protection (VC path)
(4) Large-capacity high reliability path-protection function- STM: about 40 G (VC4-256 c)- Ethernet: 10 GbE (VC4-67 v: full wire rate)
LSIF
HSIF
XC
Hitless
HSIF
LSIF
HSIF
XC
Hitless
HSIF
Transmission-route cut
(2) Create larger-capacitycross-connect switch- 320 G
(3) Ef ficiently handle various traffic types- Ef f iciently handle GbE/10 GbE、
STM 2.4 G/10 G, etc. by means of GFP/VCAT technologies
(1) Speed-up large-capacity transmission- 40 G-IF
Main-signal relief (i.e., high-reliablity path switching) on occurrence of transmission-route blockage
Copyright © 2010 NTT
NTT Research and Development 2010 Review of Activities
What’sHot in R&D Telecommunications Network Technologies
H-NW-4
In response to diversification of services, reduction of OPEX (operating expenses), etc., thinand low-friction indoor optical fiber—which provides optical-fiber services for all units inmulti-dwelling apartment blocksvia existing pipework—has been developed.Installation in and removal from pipe is much easier than in the case of conventional fiber,therebyeffectivelypromoting the conversion of apartment buildings tooptical-fiber .
■ Compatibility with all apartments by utilizing existing pipe (new pipe constructionalong with installation of new optical fiber is unnecessary)
■ Effects on existing cable during installation work are avoided, and cable can beremoved in the event of trouble
■ Conversion to low-pulling force and application of a cable-pushing method that doesnot use the leading wires of the conventional method enable efficient installation in ashort time
Overview
Features
Application scenarios
■ Multi-dwelling units like apartmentblocks■ Office buildings
Thin and Low-friction Indoor Optical FiberNTT Access Network Service Systems Laboratories
MDU: multi-dwelling unit, Direct-optical-cabling system, Existing piping
※ *SP: splitter
メ
タ
ル
今 後
VDSL 32SP
メタ
ル
VDSL
VDSL
ONU
ONU
ONU
ONU
ONU
Optical fiber
Opticalization of apartment premises
Conventional
Metal
In Future
VDSL
Apartment-type (VDSL system)
VDSL
VDSL
Apartment-type (Direct-optical-cabling system)
32 SP*
Optical fiber
Metal
Comparison of conventional fiber and thin and low-friction indoor optical fiber
Current status of indoor optical fiber installation in piping
Thin and low-frictionindoor optical fiberConventional product
General view
1Drawing force*
1Coefficient of friction*
1.6 x 2.0 (mm)SizeMore than 30 fibersSeveral fibersNumber of installedfibers
1/101/5
2.0 x 3.1 (mm)
Solutions
Problem
s
Metal
Free space is reduced because of existing fixtures in piping and installation of multiple indoor optical fibers.
Installation and removal of tangled indoor optical fibers in piping is difficult.
Miniaturization (diameter reduction)
Conversion to low f riction
In the case of the multiply bent pipes of multi-dwelling units, installation work using leading wire is difficult.
Aimed at solving these problems, thin and low-friction indoor optical fiber was developed.
Existing pipe
Cable-pushingmethod
403 404
MDF 1F
2F
3F
4F
* Relative value
φ 0.4 mmsupporting wire φ0.5 mm
supporting wire
2.0 mm
3.1 mm
1.6 mm
2.0 mm
Copyright © 2010 NTT
NTT Research and Development 2010 Review of Activities
What’sHot in R&D Telecommunications Network Technologies
H-NW-5
As wireless technology continues to develop, customers are increasingly expressing adesire to use wireless broadband services anytime and anywhere. What’s more, as wireless-LAN-compatible devices spread in popularity, the number of users of public wireless LANservices (which enable internet connection in public places like airports and train stations) isgrowing. To satisfy these customer expectations and provide a more comfortablecommunication environment, an “on-board-train internet-connection service” using wirelessLAN was developed.*1 This service was introduced on March 14, 2009 in carriages of N700-series bullet trains running onthe Tokaido Shinkansen line.
■ Stable ground-to-train communication by digital LCX*2 system■ Seamless communication while traveling at ultra high speed is made possible by
highly functional Mobile IP technology■ Commonuse of APs*3 by multiple ISPs*4 is made possible by virtual-AP technology■ Network sharing between multiple ISPs by means of L2 tunnel technology■ Establishment of optimum wireless LAN areas in special environments (like train
carriages) by utilizing radiowave-propagation design technology
Overview
Features
Application scenarios
*1 Collaborative development between Central Japan Railway Company Ltd., NTT Broadband Platform Inc., and NTT Access Network Service Systems Laboratories.
*2 LCX: Leaky Coaxial Cable *3 AP: Access Point *4 ISP: Internet Service Provider
■ Converting a train carriage into a “mobile office” by connecting business people to theiroffice networks
■ Smart phones and mobile terminals are connected to the internet, so information can beacquired during journeys
■ Game consoles equipped with wireless-LAN function are connected to game websites fornetwork matchups
■ Music players are connected tomusic websites, somusic datacan be downloaded
Internet-connection Service for Tokaido Shinkansen Bullet TrainsNTT Access Network Service Systems Laboratories
Wireless LAN, Internet access service for trains
VLAN
Internet
User terminal
HA*3
Train radio transmission
MR*5
Access router
FA*4
VLAN*2
Shared AP
Station Station
Central of f ice
Digital LCX
*1 POI-SW: Point of Interface-Switch*3 HA: Home Agent*5 MR: Mobile Router
*2 VLAN: Virtual Local Area Network*4 FA: Foreign Agent
ISP#A ISP#B ISP#C
POI-SW*1
Access router
Train radio transmission
Train radio transmission
FA
Copyright © 2010 NTT
NTT Research and Development 2010 Review of Activities
What’sHot in R&D Telecommunications Network Technologies
H-NW-6
NTT has successfully demonstrated ultra-high-capacity (69.1 Tbit/s) optical transmission tomeet the expected rapid increase in data traffic. This capacity is the highest reported in theoptical communication field. A 69.1-Tbit/s signal generated by wavelength divisionmultiplexing (WDM) of 432 wavelengths each with a capacity of 171 Gbit/s was transmittedover a single fiber over 240 km. The 16 QAM* format used led to an increase in spectralefficiency and demodulation was achieved by a newly developed digital coherent signalprocessing technique. This technology is useful for future optical core networks. (Tbit/s:terabits per second, tera = 1012.)
■ Ultra-high-capacity optical signal transmission of 69.1 Tbit/s (world record)■ Sufficient capacity to handle future increases in data traffic■ Increased spectral efficiency by using 16 QAM format■ Demodulation algorithm using novel digital coherent signal processing■ Ultra-wide band and low-noise optical amplifier
Overview
Features
Application scenarios
* QAM: Quadrature Amplitude Modulation
■ Backbone optical corenetwork of NTTCommunications■ Metro optical networkof NTTEast Corporation and NTTWest Corporation
69.1-Tbit/s Optical Transmission Technology Using Digital Coherent Multilevel QAM FormatNTT Network Innovation Laboratories
Post 100 G transmission, Digital coherent, Fusion of light and wireless
Application
(1) Received optical spectra
(2) Transmission characteristics after 240 km
69.1-Tbit/s WDM transmission of 432 wavelengths with each capacity of 171 Gbit/s1. Transmitter: 171-Gbit/s signal generation and increased spectral efficiency by using 16 QAM2. Receiver: Demodulation and waveform equalization by digital coherent detection3. Amplifier: Ultra-wide band and low-noise optical amplification
MU
X
DE
MU
X
Optical amplif ier
SignalWDM system
Optical f iber
Signal Signal
Signal
Amplif ierTransmitter Receiver
171 Gbit/s
69.1 Tbit/s
6.4 bit/s/Hzλn
λ1
λn
λ1
Router/L2-SW
Node equipment
LAN LAN
Transmissi on line
Optical transport network
Wavelength (nm)
Q v
alue
(dB
)
X pol Y pol
Q limit
12
11
10
9
816201600158015601540
Q v
alue
(dB
)
X pol Y pol
Q limit
12
11
10
9
816201600158015601540
Wavelength (nm)
Inte
nsit
y (1
0 dB
/div
)
-70
-60
-50
-40
-30
16201600158015601540
Inte
nsit
y (1
0 dB
/div
)
-70
-60
-50
-40
-30
16201600158015601540
Copyright © 2010 NTT
NTT Research and Development 2010 Review of Activities
What’sHot in R&D Telecommunications Network Technologies
H-NW-7
Aimed at creating an ecology-minded ubiquitous society with assured safety and security,the wide-area ubiquitous network provides a “bi-directional communication service withobjects” that is omnipresent everywhere. The system provides the bi-directionalcommunication service in a wide range of utilization environments both indoors andoutdoors. Furthermore, it can connect terminals that have up till now been difficult to applywith conventional wirelesssystems(e.g.,mobile phones and wireless LANs) to the network.We have built a test environment at the “specified ubiquitous district” of the Ministry ofInternal Affairs and Communications in Tokyo, and have carried out the technical verificationand service validation incollaboration with partners.
■ Long-term “maintenance-free” wireless terminals through low-power operation■ A large cell size through supplementing functional capability of wireless terminals
with that of base station■ Efficient integration of the very-short-packets characteristic of communication with
objects■ Compatible with signal-processing capability and high security needed for wireless
terminals
Overview
Features
Application scenarios
Wide-area Ubiquitous Network that Allows Communication with ObjectsNTT Network Innovation Laboratories
Ubiquitous, Sensor network, Wireless network
Company A
System Configuration
Company B
Example:Automatic meter reading and remote control
Gas meter
Gas-meter reading server
Base station
Basestation
Six wards in the eastern part of Tokyo
MusashinoR&D center
Partnercompanies
Network-management
serverBase station
IP-NW
IP-NW
Environmental sensor
Feasibility Test (Specified Ubiquitous District)
Truck
Gas meter
Monitoring sensor
Wireless terminal
Wireless terminal
Base station
Network-Management
Server
■ Remote-reading services for consumed quantity of gas, water, etc. supplied by public-utility infrastructure
■ Environmental-monitoring services practically applicable as environmental-protection andenergy-saving measures
■ Elderly-people and child-monitoring services for supporting the aging society with fewerchildren
■ Physical distribution and asset-management services that understand the whereabouts of“objects” and their mobile history
■ Status-checking and monitoring servicesfor infrastructure installation and maintenance