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eVLBI Workshop [email protected] Observatory. Trial on the Efficient Use of Trunk Communcation Lines for VLBI in Japan. Noriyuki Kawaguchi NATIONAL Astronomial Observatory,Japan. Contents. 10GbE connection with variable bit rate Kashima 34m and Koganei 11m L1 on-demand connection

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trial on the efficient use of trunk communcation lines for vlbi in japan

eVLBI Workshop

[email protected] Observatory

Trial on the Efficient Use of Trunk Communcation Lines for VLBI in Japan

Noriyuki Kawaguchi

NATIONAL Astronomial Observatory,Japan

contents
Contents
  • 10GbE connection with variable bit rate
    • Kashima 34m and Koganei 11m
  • L1 on-demand connection
    • Yamaguchi 32m and Tsukuba 32m
  • Link Aggregation of multiple GbE links
    • Tomakomai 11m access link
test fields in japan
Test Fields in Japan

Hokkaido University

Sapporo

GbE Aggregation

Tomakomai

11m

10GbE connection

Kashima

34m

L1 on-demand

Koganei

11m

Yamaguchi

32m

Tsukuba

32m

10gbe connection

10GbE

Unit

ADS-1000

VSI(DIM,2048Mbps)

D Port #1

D Port #2

D Port #3

D Port #4

VSI(DOM,2048Mbps)

VDC-100F

C Port #4

C Port #3

C Port #1

C Port #2

10GbE

SINET3

ADS-1000

VSI(DIM,2048Mbps)

10G-BASE-LR

1.3μm

VSI(DOM,2048Mbps)

VDC-100F

GbE

ADS-1000

CHLP

(Comm. POrt)

VSI(DIM,2048Mbps)

VSI(DOM,2048Mbps)

VDC-100F

Network CPU

ADS-1000

VSI(DIM,2048Mbps)

(Comm. & Cont.)

VSI(DOM,2048Mbps)

VDC-100F

GbE

Cont. CPU

CTLP

(Cont. Port)

(Local Control)

10GbE Connection

2.048 Gbps x 4 I/O ports

10GbE Port

photo
Photo

Real time Correlator

10GbE

Unit

From Kashima

2GHz A/D

From

Koganei

11m

10 GbE Analyzer

bit rate control in congestion
Bit Rate Control in congestion

Bit Rate

Down to

2Gbps

Time Code

Not detected

Time Code

Partially detected

Bit Rate

Down to

1Gbps

Time Code

completely detected.

Possible to start

correlation

Bit Rate

Down to

0.5Gbps

packet arrival time records
Packet Arrival Time Records

No Congestion

Under heavy congestion

Many packets are stocked

in memory and suddenly

released in very short time.

New function to pick up the suddenly released packets

are now considered.

efficient use of limited resource
Efficient Use of limited Resource
  • We can enjoy long time and wide bandwidth on Saturday and Sunday!
l1 on demand connection1
L1 on-demand connection
  • Reservation (30minutes before observation)
    • Request to the connection time
    • Request to the bandwidth
    • Negotiation for time and bandwidth
    • Report for the time and bandwidth granted
  • Telescope Operation
  • Real time Fringe Monitoring
first success in real time observation on l1 on demand connection
First Success in real time observation on L1 on-demand connection

June 12,

2008

Yamaguchi 32m

Tsukuba 32m

X-band

2Gbps

link aggregation technique

Link Aggregation Technique

Binding cheap low-bit-rate links

And

Getting a extremely high bit rate

link aggregation of multiple gbes
Link Aggregation of multiple GbEs

Connections with low bit rate

links in cheap cost

11m Telescope

in Tomakomai

Hokkaido University

in Sapporo

BW=512MHz

(512-1024MHz)

ADS-1000

VOA-200

SINET3

GbE x 3

Foundry

MLX-4

To

Mitaka, Tokyo

Foundry

MLX-4

A/D converter

of 2.048-Gbps

sampling

10GbE

Unit

Hope to carry 2Gbps

payload through three

GbE connections

The link aggregation test will start in this summer.

space light path

光空間伝送

Town, City

Observatory

Trunk Communication

Line

Space Light Path

Laser Beam Tracking Mirror developed

10-Gbps, 10-km connection is a target.

conclusions
Conclusions
  • Efficient Use of Communication Line
    • shared use of 10GbE line
      • successfully demonstrated in the test between Kashima-Koganei
    • L1 on-demand connection
      • successfully performed in the first test between Ymaguchi and Tsukuba
    • Link Aggregation
      • to be achieved in 2008
    • Space Light Path Connection
      • To be tested in Usuda 64m site
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