Post on 14-Jan-2016
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 RemoteRemote
RemoteRemoteRemoteRemote
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 RemoteRemote
RemoteRemoteRemoteRemote
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
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
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
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
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
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
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
STDMA Burst Controller
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
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
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
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
STDMA Burst Controller
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
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
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
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
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
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
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
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
STDMA Burst Controller
Free Demod 1
Free Demod 2
VMS
M(F1)D(F2)
M(F2)D(F1)
D(F1) M(F2)
SHOD IN OPERATION
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
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
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
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
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
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
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
STDMA Burst Controller
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
Remote 2 Sends Automatic Switch Request (ASR) to VMS
3
D(F1) M(F2)
D(F1) M(F2)
SHOD IN OPERATION
D(F2) M(F1)
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
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
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
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
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
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
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
STDMA Burst Controller
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
Remote 2 Sends Automatic Switch Request (ASR) to VMS
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