DA TDMA 4 NODES 1.Temasek Polytechnic, Singapore 2.NTU, Singapore 3.USM, Malaysia 4.UPM, Malaysia.

DA TDMA

4 NODES

1. Temasek Polytechnic, Singapore

2. NTU, Singapore

3. USM, Malaysia

4. UPM, Malaysia

diagram 1.doc

Network Characteristics

• TDM/ DVB outbound

• TDMA inbound

• Overlay DAMA

• Bandwidth on Demand

• IP Encapsulation

TDM/SCPC

Satellite dish

Satellite

Satellite dish

Satellite dish

Internet

LAN

Computer

WorkstationSatellite dish

TDM = Time Division Multiplex

Efficient Use of Bandwidth for"Bursty" Traffic, such as Internet

LAN

1 2 3

4 5 6

7 8 9

* 8 #

Guarantees Dedicated Inbound BW forstreaming Applications such as Voice

TDM/TDMA

Satellite dish

Satellite

Satellite dish

Satellite dish

Internet

LAN

Computer

WorkstationSatellite dish

LAN

1 2 3

4 5 6

7 8 9

* 8 #

TDMA = Time Division Multiple Access

Multiple Remotes Share a CommonInbound Frequency

Adds Latency as Each RemoteOnly Transmits Part of the Time

Not Effective for StreamingApplications such as Voice

Network Topology

HUB

Remote Remote

RemoteRemote

Remote

HUBHUB

RemoteRemote RemoteRemote

RemoteRemoteRemoteRemote

RemoteRemote

Vipersat Begins with aBasic Star Topology

The hub sends a TDM outbound whichis statistically multiplexed with allremotes

The remotes have a dedicatedSCPC or shared STDMAinbound link

Network Topology-2

HUB

Remote Remote

RemoteRemote

Remote

HUBHUB



RemoteRemote

Through IP routing, the network can beconfigured as a Virtual Mesh

Virtual mesh allows remote to remotecommunications through the hub

This will require a doublesatellite hub, increasing latency.

Virtual Mesh

Network Topology-3

HUB

Remote Remote

RemoteRemote

Remote

HUBHUB



RemoteRemote

Network Topology can be Dynamically altered toprovide true mesh connectivity

Single Hop on Demand(SHOD) provideslow latency Voice connections withoutadding multiple remote carriers

DAMA provides high-speed mesh connectivityfor data or video applications

RF

Eth

ern

et

10

/10

0

RFHW

IF R

X

Satellite

VMS

Remote N

BUC

LNB

L-Band

SMR 5000L

LAN

Client PC

VoIP/FAX

Switched Inbound

Switched Inbound

Applications Satellite Equipment

Broadcast OutboundSTDMA Inbound

Network Center

Basic TDM/STDMAWith Upstream Switching

Channel Plan

Inbound SlotsSwitched

STDMAInbound

Outbound

BUC

LNB

L-Band

SMR 5000L

LAN

Client PC

VoIP/FAX

BUC

LNB

L-Band

SMR 5000L

LAN

Client PC

VoIP/FAX

Remote 2

Remote 1

a subsidiary of Comtech Telecommunications Corp7/1/2003

IF TXIF

RX

VOIP

Internet

SCPCTDM Broadcast

128k 64k

STDMA

128k

Note: Basic system for low bandwidthdata or internet and low density voice

Load Switching

Mod Cxr Freq70.125613MHz

M 4000Satellite M od em

T es t M ode T es t M ode R em ote

M inor A larm M inor A larm Local

M ajor A larm M ajor A larm A larm

T ransm it O n S ignal Lock P ower

M odulat or D em odulat or

1 2 3

4 5 6

7 8 9

E nt er

0

C lear

Eth

erne

t

Eth

erne

t








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E nt er

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1 2 3

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E nt er

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STDMA Burst Controller

Free Demod 1

VMS

M(F1)D(F2)

M(F2)D(F1)

Network is operating in STDMA mode with no load present at the remote

SCPC Demodulator is parked








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Eth

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Eth

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Free Demod 1

VMS

M(F1)D(F2)

M(F2)D(F1)

Satnet port buffer status is captured and sent to the STDMA Hub Controller

1

STDMA Controller detects pre-selected buffer limits

and sends Automatic Switch Request (ASR) to the VMS

2

VMS receives request, and if a free demod and space segment are

available, sends switch command

3








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Eth

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Eth

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Free Demod 1

VMS

M(F1)D(F2)

M(F3)D(F1)

Satnet port buffer status is captured and sent to the STDMA Hub Controller

1

STDMA Controller detects pre-selected buffer limits

and sends Automatic Switch Request (ASR) to the VMS

2

VMS receives request, and if a free demod and space segment are

available, sends switch command

3

Demodulator is tuned to receive SCPC Inbound from remote

4

SCPC demod monitors buffer utilization and sends request to VMS to switch up or down

based on traffic conditions

5

Modulator is tuned to send SCPC inbound to the hub

4

D(F3)

Application Switching(described in SHOD)

SINGLE HOP ON DEMAND








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Eth

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Eth

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Free Demod 1

Free Demod 2

VMS

M(F1)D(F2)

M(F2)D(F1)

D(F1) M(F2)

SHOD IN OPERATION








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Eth

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Eth

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Eth

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Free Demod 1

Free Demod 2

VMS

User Calls Remote 2

1

Remote 2Answers

Call

2

Remote 1 Sends Automatic Switch Request (ASR) to VMS

3


3

D(F1) M(F2)

D(F1) M(F2)

SHOD IN OPERATION

D(F2) M(F1)








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Eth

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Eth

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Free Demod 1

Free Demod 2

VMS

User Calls Remote 2

1

Remote 2Answers

Call

2


3


3

VMS RX’s ASRs and Sends out a Multicast Which Tunes Mods & Demods Simultaneously

4

D(F1) M(F3)

D(F1) M(F4)

SHOD IN OPERATION

D(F2) M(F1)

Firewalls are dynamically added to prevent non-management traffic from looping back to the remote networks

4D(F3)

D(F4)

D(F3)

D(F4)

POSSIBLE APPLICATIONS

• TELEMEDICINE

• MCS VIDEO CONFERENCING

• DISTANCE EDUCATION

ASSOCIATION WITH PARTICIPANTS

1. NTU, Singapore• VARIOUS PROJECTS

• TELEMEDICINE

• Ku BAND TESTS

2. USM, Malaysia– PARTNERS IN ASIAN INTERNET INTERCHANGE

INITIATIVE

– DISTANCE EDUCATION

– SEVERAL OTHER PROJECTS

THANK YOU

SICU

DA TDMA 4 NODES 1.Temasek Polytechnic, Singapore 2.NTU, Singapore 3.USM, Malaysia 4.UPM, Malaysia.

Documents

Transcript of DA TDMA 4 NODES 1.Temasek Polytechnic, Singapore 2.NTU, Singapore 3.USM, Malaysia 4.UPM, Malaysia.