DAMA Technology

8/4/2019 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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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 Unit

Channel Unit



Channel Unit

Channel Unit

OUTLINK FROM HUB

VOICE CALL

BETWEEN

SITES

NETWORK

MANAGEMENT

SYSTEM

M&C CarrierReturnlink Carriers DAMA Bandwidth


Channel Unit

Channel Unit


PABX

PABX

RETURN LINKS TO HUB

Outlink



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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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NMSNMS


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NMS FunctionNMS FunctionThe NMS performs the following functions:

Call Processing

Administration

Integrated System-wide Monitoring and Control

Maintenance.


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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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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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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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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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Hub BasebandHub Baseband


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Hub BasebandHub BasebandTypes of control channels

There are three types of control channels

OUTLINK/outbound

ALOHA / INBOUND

M&C


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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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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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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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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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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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Remote HardwareRemote HardwareSkylink series 8000 chassisFront view

Rear view


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SA BUS CABLE

Connecting two IF CHASSIS


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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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Remote HardwareRemote HardwarePower requirement for IF/RF chassis chassis


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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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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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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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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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Remote HardwareRemote HardwareChannel unitsIndications

All CU have the following indications

Status LedRx LedTX LedBusy Led


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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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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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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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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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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


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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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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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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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

Documents

DAMA Technology