Download - DAMA Technology
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By
Subodh KumarIT Branch
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Introduction to DAMA
What is DAMA ?
DAMA : Demand Assign Multiple Access
Technique for sharing and accessing communication
channels.
The transponder BW is shared by multiple users on
Demand Assign basis.
Hub for resource allocation and bare minimum house
keeping functions
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Introduction to DAMAIntroduction to DAMA
Transponder BW is precious resource & needs to be effectively
utilized.
DAMA access technique makes the best possible use of this
resource by reusing & Sharing a common pool of BW
DAMA gives full mesh connectivity
The communication is on a single satellite HOP thus making it
ideal for Voice communication
Advantages of DAMA.
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Introduction to DAMAIntroduction to DAMA
DAMA data channels are protocol transparent meaning they do
not add any overheads thus giving a very high through put .
DAMA is also best suited for applications that require High
Bandwidth for a finite time e.g. Video conferencing.
Advantages of DAMA.
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A common frequency pool is assigned to a group of
users .
Control channels in the HUB are used to process
call requests & call teardown messages from the usersNMS allocates & releases frequencies & Bandwidth
to user on demand basis
NMS controls & monitors the remote site
How DAMA works ?
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Satellite Transponder
Channel Unit
Channel Unit
Channel Unit
Channel UnitChannel Unit
Channel UnitChannel Unit
Channel Unit
Channel Unit
Channel UnitChannel Unit
Channel UnitChannel Unit
Channel Unit
Channel Unit
OUTLINK FROM HUB
VOICE CALL
BETWEEN
SITES
NETWORK
MANAGEMENT
SYSTEM
M&C CarrierReturnlink Carriers DAMA Bandwidth
Channel UnitChannel Unit
Channel Unit
Channel Unit
Channel UnitChannel Unit
PABX
PABX
RETURN LINKS TO HUB
Outlink
Introduction to DAMAIntroduction to DAMA
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Introduction to DAMAIntroduction to DAMASCPC DAMA & PAMA
ALWAYS THERE
TRAFFIC
PAMA
DAMA
ONLY WHEN TRAFFIC
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Introduction to DAMAIntroduction to DAMASkylink DAMA system architecture
The basic system architecture consists of
HubSkylink 1+1 redundant DAMA NMSAdministration & control terminalMaster signaling & control channel units
RemotesSkylink 8000 remote chassis
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Skylink Hub ArchitectureSkylink Hub Architecture
Three basic components of HUB :
NMS : Network management Server
AMT : Administration & Maintenance terminal
BASEBAND : Consisting of MSCU / Control cards & chassis
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Skylink Hub ArchitectureSkylink Hub Architecture
NMSNMS
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Skylink Hub ArchitectureSkylink Hub Architecture
NMS FunctionNMS FunctionThe NMS performs the following functions:
Call Processing
Administration
Integrated System-wide Monitoring and Control
Maintenance.
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Skylink Hub ArchitectureSkylink Hub Architecture
NMS FunctionNMS FunctionCall Processing
NMS does the following functions for processing calls
Maintains & allocates the BW pool & frequencies from a
master database.
Maintains database of traffic statistics e.g. How many call attemptswere made ,The peak traffic time etc
Maintains database of call records in form of CDR files
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Skylink Hub ArchitectureSkylink Hub Architecture
NMS FunctionNMS FunctionAdministration
NMS does the following Administrative functions
Maintains a database of all remote sites configuration
Maintains a database of telephone numbers of each device
In the network
Maintains Routing tables for routing calls in the network
Implements different levels of security access by means of
passwords
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Skylink Hub ArchitectureSkylink Hub Architecture
NMS FunctionNMS FunctionMonitoring & control
NMS polls each defined device in its database for status & health
NMS shows the status of each site & device e.g. whether the device is
Faulty or working, whether the device/site is on call or idle .
NMS also shows the status of individual links on the network e.g. the linkEb/No values, the link data rate ,modulation etc
Auxiliary devices which are not a part of skylink network can also
be controlled & monitored e.g. Power amplifiers & antenna controllers.
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Skylink Hub ArchitectureSkylink Hub Architecture
NMS FunctionNMS FunctionMaintenance
NMS has the capability to test each device in the Network &
report its status automatically.
NMS also reports the status of each link & its performance .
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Skylink Hub ArchitectureSkylink Hub Architecture
Hub BasebandHub Baseband
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Skylink Hub ArchitectureSkylink Hub Architecture
Hub BasebandHub BasebandTypes of control channels
There are three types of control channels
OUTLINK/outbound
ALOHA / INBOUND
M&C
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Skylink Hub ArchitectureSkylink Hub Architecture
Hub BasebandHub Baseband
Outlink function
Its a 16 k BPSK control channel which is transmitted to all the
Remote sites.
The network server communicates with the remote sites
The administrative and control information from the server is sent
via the outlink
Frequency correction is also done by the outlink control channel.
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Skylink Hub ArchitectureSkylink Hub Architecture
Hub BasebandHub Baseband
The remote sites transmit 16k BPSK Aloha bursts to the HUB .
Aloha bursts contain the call setup request /call termination
request from the remote sites.
The return link MSCU passes these call requests to the Network
server .
There can be a maximum of 5 return link MSCU per satellite
depending On the traffic requirement.
Aloha /inbound function
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Skylink Hub ArchitectureSkylink Hub Architecture
Hub BasebandHub BasebandM&C control channel
The remote sites transmit 16k M&C Aloha bursts to the HUB whenHub Requests for status/health check of remote site via the OUTLINK.
M&C bursts contain the status & health of the remote sites.
There can be a maximum of 1 M&C MSCU per satellite .
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Skylink Hub ArchitectureSkylink Hub Architecture
Hub BasebandHub Baseband
Scientific
AtlantaCHANNEL UNIT
CHANNEL UNIT
CHANNEL UNIT
CHANNEL UNIT
Outlink
Return link
M&C
CONTROL CHANNELS
REMOTE
HUB
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Skylink call setupSkylink call setup
User AUser B
NMS
PHONE OFF HOOK
Dial Tone by VCU
Dialed digits
VCU checks digit table&
Number forwarded. Request for call on Aloha
Checks phone no/
Status of User B
Allocation of freq to User A &B
Ring back tonePhone rings
Phone off hook
Communication starts
Phone on hook
Call teardown requestOn Aloha
Call drop
NMS frees the freq pool
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Skylink Remote ArchitectureSkylink Remote Architecture
Remote site Hardware.
Remote site software.
Remote site configuration using PMT.
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Skylink Remote ArchitectureSkylink Remote Architecture
Remote HardwareRemote Hardware
Skylink series 8000 chassis
Voice channel unit cards
High speed Data channel unit cards
Remote site configuration using PMT
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Skylink Remote ArchitectureSkylink Remote Architecture
Remote HardwareRemote HardwareSkylink series 8000 chassisFront view
Rear view
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Skylink Remote ArchitectureSkylink Remote Architecture
Remote HardwareRemote Hardware
SA BUS CABLE
Connecting two IF CHASSIS
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Skylink Remote ArchitectureSkylink Remote Architecture
Remote HardwareRemote HardwareCascading of chassis IF
RX OUT TX IN
RX IN TX OUT
RX OUT TX IN
RX IN TX OUT
RX IFLTX IFL
SA BUS
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Skylink Remote ArchitectureSkylink Remote Architecture
Remote HardwareRemote HardwarePower requirement for IF/RF chassis chassis
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Skylink Remote ArchitectureSkylink Remote Architecture
Remote HardwareRemote HardwareSetting the site /shelf id
Locate the switches on the rear panel of the chassis,
using the following illustration for the location of theswitches:
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Skylink Remote ArchitectureSkylink Remote Architecture
Remote HardwareRemote HardwareChannel units
Four CU types The Series 8000 CU will be offered in four
hardware configurations:
Voice Channel Unit (VCU)
High speed Channel Unit (HSCU)
All channel units are hot swappable
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Skylink Remote ArchitectureSkylink Remote Architecture
Remote HardwareRemote Hardware
Voice Channel Unit (VCU)
It supports both voice & data.
Voice rate supported are8k G729
16K G728
32K ADPCM
64K PCM
Data rates from 8k to 160 k synchronous & asynchronous
In steps of 1 bps up115.2 kbps
Supports both QPSK & Modulation
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Skylink Remote ArchitectureSkylink Remote Architecture
Remote HardwareRemote HardwareHigh speed Channel Units
It supports only data.
Data rates from 32k to 2048 k synchronous in steps of n*32k
Supports both QPSK & ,7/8 Modulation
It also supports Reed Solomon Coding
It supports asymmetric data rates
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Skylink Remote ArchitectureSkylink Remote Architecture
Remote HardwareRemote HardwareChannel unitsIndications
All CU have the following indications
Status LedRx LedTX LedBusy Led
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Skylink Remote ArchitectureSkylink Remote Architecture
Remote HardwareRemote Hardware
Channel unitsIndications
STATUS RX TX BUSY
NORMAL MODE
BUSY MODE
REVERSION
MODEM ALARM
No Signal
RECEIVE
ONLY MODE
CARD UPDATION
BLINK
BLINKBLINK
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Skylink Remote ArchitectureSkylink Remote Architecture
Remote HardwareRemote HardwareChannel unitsIndications
Reversion means that the channel unit lost the outlink carrier for
More than 5 minutes & then locked back.
TX LED will glow only when CU is Transmitting in a call
Status LED should always be green
Busy Led will normally flicker when CU is not in call but will
Turn green when CU is in call
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Skylink Remote ArchitectureSkylink Remote Architecture
Remote HardwareRemote HardwareChannel units software
There are 4 important basic files for all CUS
IMP:IMP Controller Binary file, Integrated Multi-Protocol Processor;program that operates all functions of a channel
unit.
CPL:CPL State Machine Binary file, POTS; controls the call setup by
defining what type of circuit will be used.
MODEM: Digital MODEM Binary file which contains the executableprograms to run the various DSP chips; these executable programs are
loaded into the modem at the start and end of every phone call.
CODEC:Voice CODEC Binary file which contains the program
responsible for the telephone interface circuitry and voice compression
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Skylink Remote ArchitectureSkylink Remote Architecture
RFRF
Scientific
AtlantaCHANNEL UNIT
CHANNEL UNIT
CHANNEL UNIT
CHANNEL UNIT
L BAND CONV
LNB
BUC
70 MHZ 950-1700MHZ
950-1450 MHZ
RF 14-14.5 GHZTX
RX8000
INTEGRATION WITH AGILIS/NJRC
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Skylink Remote ArchitectureSkylink Remote Architecture
RFRF
Scientific
AtlantaCHANNEL UNIT
CHANNEL UNIT
CHANNEL UNIT
CHANNEL UNIT
CONTROLLER
70 MHZ 70 MHZ
RF 14-14.5 GHZTX
RX8000
INTEGRATION WITH GILAT
CONVERTER
+AMPLIFIER
LNB
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Voice, Fax & Data on the same card
Asynchronous Data rate up to 128 Kbps
2 Mbps Internal Modem
High Speed modem provides Asymmetric Bandwidth connectivity
G.728 16 Kbps, G.729 8 Kbps voice
Synchronous Data rate up to 160 Kbps
Remote NMS
Sub Network
Call Priority
PAMA Data Call Setup without hub intervention
Handset Initiated Data Call
Multi Satellite / Multi transponder support
Time events
Incremental Data at 1 bps
Remote Location RF Monitoring from Hub
SKYLINK FEAUTERS
S
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Skylink FeaturesSkylink Features
NMS features.
Multi satellite support
Multi transponder Support
Moderated Multi way callingForced rate calling
Timed events
Sub networks
Telephony features
Handset initiated data call
FAX data Relay
Data Features
V25 BIS
Sk li k F
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Skylink FeaturesSkylink FeaturesNMS FEAUTERS
MULTI SATELLITE SUPPORT
MSCU
MSCU
MSCU
Sk li k F t
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Skylink FeaturesSkylink FeaturesNMS FEAUTERS
Sub networks
Customer A Customer B
Subnet 1 Subnet 2
FREQ POOL
COMMON POOL
SSk li k F t
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Skylink FeaturesSkylink FeaturesTelephony FEAUTERS
Handset initiated data call
It is possible to make synchronous DAMA data calls from the remote sites using Telephone .
This eliminates the need for HUB operator to assign a DAMA data call between two remotes.
The user dials a string of numbers from his handset connected to VCU card .
The string of Numbers are
*03(source data card phone number)#(destination data card phone number ) #
After dialing the string the user will hear 3 beeps which are acknowledgment that the call has
been accepted by the NMS.He hangs up the phone.
The NMS makes a DAMA data call between two sites
Sk li k FSk li k F t
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Skylink FeaturesSkylink FeaturesTelephony FEAUTERS
Handset initiated data call
Video ConferenceTerminal
Scientific
AtlantaCHANNELUNIT
CHANNELUNIT
CHANNELUNIT
CHANNELUNIT
Skylinx VCU inSkylinx Chassis
2 wire loop
RJ-45
Video ConferenceTerminal
Scientific
AtlantaCHANNELUNIT
CHANNELUNIT
CHANNELUNIT
CHANNELUNIT
Skylinx VCU inSkylinx Chassis
2 wire loop
RJ-45
Request for call
Freq allocation
DATA LINK
NMS
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Skylink FeaturesSkylink FeaturesTelephony FEAUTERS
VOXING
VOXING : voice activated carrier
Used for conserving the transponder power.
The voice carrier will get activated only when someone speaks otherwis
There will be no carrier transmitted.
To get good audio quality with VOXING min Voice rate should be32kbps.
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Skylink FeaturesSkylink FeaturesTelephony FEAUTERS
Fax data relay
The VCU card has inbuilt Fax data relay which supports fax upto
9.6kbps
For fax rates of 14.4kbps FDR boards have to be purchased.
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DATA on DAMA NetworkDATA on DAMA NetworkData FEAUTERS
V25 BisV.25bis = ITU standard for circuit switched data call set-
up on-demand, mesh connectivity between any location
The router serial port is configured for dial up mode
When there is interesting traffic the router dials a number
S
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Skylink FeaturesSkylink FeaturesData FEAUTERS
V25 Bis...
Router
LAN
.
.
.
Router
LAN
...
Router
LAN
...
Router
LAN
Location # 1
Location # NLocation # 3
Location # 2
Skylinx SatelliteNetwork
On-demand switched sync.
data circuits
V.25bis V.25bis
V.25bis
V.25bis
Sk li k F
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Skylink FeaturesSkylink FeaturesOther useful FEAUTERS
Data abort voice/Voice abort data in VCU
You can define precedence of traffic on VCU.
If Voice abort data is set & VCU is busy in data call ,the VCU
Will drop the data call as soon as handset is lifted.
If data abort voice is set , the data call on CU will drop the voice
channel
DATA DAMA N t k
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DATA on DAMA NetworkDATA on DAMA NetworkData FEAUTERS
PAMA Mode
PAMA Mode = Communication Link provided with
dedicated speed round the clock
DATA connection in Start Topology
Asymmetric Speeds (UP load and Down loads)
Broadcasting mode for Enhanced throughputs
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PAMA Mode / Broadcasting mode...
Router
LAN
.
.
.
Router
LAN
...
Router
LAN
...
Router
LAN
Location # 1
Location # NLocation # 3
Location # 2
Satellite PAMANetwork /
Broadcasting Mode
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Remote SCPC DAMA VSAT Terminalemote SCPC DAMA VSAT Terminal1.8 Meter Antenna ( Inte lsat Approved ) : 1 No.4 Watts Ku Band RFT(NJRC) : 1 No.4 Slot DAMA Chassis : 1 No.Voice Channel Unit : 1 No.High Speed Data Channel Unit : 2 No.Router (Cisco) : 1 No.Video Conferencing Equipment(Polycom) : 1 No.T.V with Trol ley (Thompson) : 1 No.IRD (Video broadcast Receiver) : 1 No.
CPC DAMA MOBILE V AT TERMINAL
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Voice
VCUVCU
HSCUHSCU
HSCUHSCU
VACANT SLOTVACANT SLOT
Series 8000 IDUIFLCable
1.8 Mtr.Antenna
4 WattsODU
VideoConferencing
Ethernet LAN
D-linkRouter
SCPC DAMA MOBILE VSAT TERMINAL
RFT INDOOR UNIT
IRD
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Series 8000 Voice Channel Unit (VCU)
Comprehensive Suite of
Voice Coding Options: 8, 9.6, 16 kbps ASET-pf
ITU G.721 32 kpbs ADPCM
ITU G.723 40 kbps ADPCM (optional)
ITU G.728 16 kbps LDCELP (optional)
ITU G.729 8 kbps AS-CELP (optional)
64 kbps PCM (optional)
Voice and Data on the SameCard
Simplifies customer logistics
Software selectable universal 2-
Wire loop and 4 Wire E&M Types I-V voice interface
Software selectable RS-232 andEIA-530 data interface
Separate version for DigitalConnect E1 interface
Optional Fax/Data Relayfor increased throughputVoice Rate Fax Data
8 kpbs 7200 bps 7200 bps
16 kbps14400 bps 14400 bps32 kbps14400 bps 28800 bps
Highest VBD speed in VSATindustry
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Skylinx High Speed Data Channel Unit (HSCU )
High speed (32 - 2048 kbps) for
broadband data bandwidth
on demand applications
LAN-LAN interconnectivity
Videoconferencing
File transferInternet access
DAMA software to reduce
satellite bandwidth
DTR/RTS activated included for pre-assigned DAMAV.25bis is available software option for mesh DAMA switching
Compatible with Ciscos Dial on Demand IP routing
Reed Solomon coding with interleaving to reduce satellite power
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Thank youThank you