Telecommunications Network TechnologiesCurrent status of indoor optical fiber installation in piping Thin and low -friction indoor optical fiber Conventional product General view Drawing

Telecommunications Network Technologies

H-NW-1

H-NW-2

H-NW-3

H-NW-4

H-NW-5

H-NW-6

H-NW-7

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




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


■ 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




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


*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




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


■ 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

ＭＤＦ１F

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




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


*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



FA




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


* 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




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


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

Documents

Telecommunications Network TechnologiesCurrent status of indoor optical fiber installation in piping Thin and low -friction indoor optical fiber Conventional product General view Drawing