cdm qx presentation
TRANSCRIPT
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ADVANCED COMMUNICATION SOLUTIONS
CDMCDM--Qx/QxL Satellite ModemQx/QxL Satellite Modem
withwithDoubleTalkDoubleTalkTMTM CarrierCarrier--inin--CarrierCarrier
The Most Bandwidth Efficient Modem Ever !The Most Bandwidth Efficient Modem Ever !
November 2007November 2007
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Agenda
DoubleTalk Carrier-in-Carrier Overview
Business Case - Why use CDM-Qx/QxL withDoubleTalk Carrier-in-Carrier ?
CDM-Qx/QxL OverviewArchitecture
FeaturesConfiguration
DoubleTalk is a Trademark of Applied Signal TechnologyCarrier-in-Carrier is a Registered Trademark of Comtech EF DataAll specifications are subject to change without notice.
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Traditional SATCOM Optimization
Traditionally, you could reduce Bandwidth orPower, but notboth without significantlyincreasing the CAPEXReduce Occupied Bandwidth
Use Higher Order Modulation
Increases Transponder Power Utilization Increases BUC/HPA Size and/or Antenna Size
Reduce Transponder Power Utilization Use Lower Order Modulation
Increases Occupied Bandwidth
Reduces BUC/HPA Size and/or Antenna Size
Without Using Lower Order Modulation
Increase Antenna Size
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Traditional SATCOM Optimization
Reduce BUC/HPA Size
Use Lower Order Modulation Increases Occupied Bandwidth
Without Using Lower Order Modulation
Increase Antenna Size
Reduce Antenna Size
Use Lower Order Modulation
Increases Occupied Bandwidth
Without Using Lower Order Modulation
Increases Transponder Power
Increases BUC/HPA Size
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Multi Dimensional Optimization
DoubleTalk Carrier-in-Carrier combined withproper Modulation and FEC, makes it possible tooptimize satellite communications like neverbeforeReduce OPEX
Occupied Bandwidth & Transponder Power
Reduce CAPEX BUC/HPA Size and/or Antenna Size
Increase throughput Increase link availability
Or a combination to meet different objectives
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DoubleTalk Carrier-in-Carrier
Based on Applied SignalTechnologys (APSG)DoubleTalk bandwidthcompression system Uses patented Adaptive
Cancellation Allows full duplex satellite links totransmit concurrently in the samesegment of transponder bandwidth
Delivers unprecedented savingswhen combined with Comtech EFDatas advanced Forward ErrorCorrection and Modulationtechniques
Without DoubleTalk Carrier-in-Carrier
With DoubleTalk Carrier-in-Carrier
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DoubleTalk Carrier-in-CarrierTheory of Operation
Mod_1 Demod_1 Demod_2 Mod_2
S1 S2
(S1+S2)*'
S1* S2*S1 S2
S2 S1
(S1+S2)*''
S1* - Time Delayed Copy of S1
(S1+S2)*' Composite Signal
S2* - Time Delayed Copy of S2
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Theory of Operation (contd)
At start-up, the modem calculates the exact
round-trip delay The modulator provides a copy of the time
delayed transmitted signal to the demodulator
The demodulator cancels the time delayedtransmitted signal from the composite receivedsignalNominal cancellation is 25 dB to 30 dB
The residual interfering signal appears as noise i.e. the Noise Floor is raised, slightly degrading the Eb/No
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Eb/No Degradation - QPSK
Very low degradation when using QPSK
Eb/No Degradation vs Carrier Power Ratio (QPSK)
-0.5
-0.4
-0.3
-0.2
-0.1
0.0
-10 -5 0 5 10
Interferer - Desired Carrier Power (dB)
Eb/NoDegradation(dB)
QPSK, TPC 17/18
QPSK, TPC 3/4
QPSK, TPC 21/44
QPSK, TPC 7/8
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Eb/No Degradation 8-PSK
Low degradation except for TPC, Rate 17/18
Eb/No Degradation vs Carrier Power Ratio (8-PSK)
-1.2
-1.0
-0.8
-0.6
-0.4
-0.2
0.0
-10 -5 0 5 10
Interferer - Desired Carrier Power (dB)
Eb
/NoDegradation(dB
)
8-PSK, TCM 2/3
8-PSK, TPC 7/8
8-PSK, TPC 3/4
8-PSK, TPC 17/18
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Eb/No Degradation 16-QAM
Low degradation for TPC, Rate 3/4
Eb/No Degradation vs Carrier Power Ratio (16-QAM)
-2.0
-1.8
-1.6
-1.4
-1.2
-1.0
-0.8
-0.6
-0.4
-0.2
0.0
-10 -5 0 5 10
Interferer - Desired Carrier Power (dB)
Eb
/NoDegradation(dB)
16-QAM, TPC 3/4
16-QAM, TPC 7/8
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DoubleTalk Carrier-in-CarrierOperational Rules for CDM-Qx
Full-duplex links only CDM-Qx must be configured as a Modem
Loop-back satellite (i.e. the transmitting station must beable to receive itself)
Non-processing satellite (i.e. does not demodulate/
remodulate the signal) Symbol rate asymmetry of the 2 carriers should be within
3:1 for optimal performance
(Interfering carrier power desired carrier power), in dB,< 10 dB (except for 16QAM, R=7/8)
Carrier offset within 32 kHz i.e., Center frequencies of the desired and the interfering carriers
are within 32 kHz
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Optimization Tradeoffs
With proper selection of Modulation and FEC,DoubleTalk Carrier-in-Carrier can be used toachieve multi-dimensional optimization
The following slides show an existing network
and the optimization possibilities
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Optimization Tradeoffs Example
4 site Network with 23 E1s between Hub andRemotes
Original Network
Modulation & Coding QPSK, TPC 3/4 & 8PSK, TPC 7/8Allocated Bandw idth 56.0 MHz
Power Eq. Bandw idth 23.7 MHzTotal Lease Resource 56.0 MHz
Excess Margin 3.7 dB
HPA @ Hub 15.9 W
HPA @ Remote1 165.0 WHPA @ Remote2 61.8 W
HPA @ Remote3 166.4 W
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Option A(Optimize Everything)
Reduce Leased Bandwidth and CAPEX andincrease Availability
Use DoubleTalk Carrier-in-Carrier with QPSK TPC 7/8
OriginalWith Doub leTalk
Carrier-in-Carrier
Savings/Improvement
With Carrier-inCarrier
Allocated Bandw idth 56.0 MHz 37.7 MHz 33%
Power Eq. Bandw idth 23.7 MHz 15.4 MHz 35%
Total Lease Resource 56.0 MHz 37.7 MHz 33%
Excess Margin 3.7 dB 3.9 dBW 5%
HPA @ Hub 15.9 W 9.5 W 40%HPA @ Remote1 165.0 W 99.0 W 40%
HPA @ Remote2 61.8 W 72.5 W
HPA @ Remote3 166.4 W 101.5 W 39%
QPSK, TPC 3/4 &8PSK, TPC 7/8
Modulation & Coding QPSK, TPC 7/8
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Option B(Maximize OPEX Saving)
Maximize Leased Bandwidth saving Use DoubleTalk Carrier-in-Carrier with 8-PSK TPC 3/4
and 8-PSK TPC 7/8
OriginalWith DoubleTalk
Carrier-in-Carrier
Savings/Improvement
With Carrier-inCarrier
Allocated Bandw idth 56.0 MHz 28.4 MHz
Pow er Eq. Bandw idth 23.7 MHz 25.9 MHz
Total Lease Resource 56.0 MHz 28.4 MHz 49% saving in Leased BW
Excess Margin 3.7 dB 0.5 dB
HPA @ Hub 15.9 W 15.6 W
HPA @ Remote1 165.0 W 166.5 WHPA @ Remote2 61.8 W 119.0 W
HPA @ Remote3 166.4 W 175.0 W
Modulation & CodingQPSK, TPC 3/4 &
8PSK, TPC 7/8
8PSK, TPC 3/4 &
8PSK, TPC 7/8
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Option C(Maximize Availability & Save CAPEX)
Increase Availability (margin) while savingCAPEX
Use DoubleTalk Carrier-in-Carrier with QPSK TPC 21/44and QPSK TPC 3/4
OriginalWith Doub leTalk
Carrier-in-Carrier
Savings/Improvement
With Carrier-inCarrier
Allocated Bandw idth 56.0 MHz 56.0 MHz
Pow er Eq. Bandw idth 23.7 MHz 12.4 MHz
Total Lease Resource 56.0 MHz 56.0 MHz
Excess Margin 3.7 dB 7.6 dB 145%HPA @ Hub 15.9 W 9.0 W 43%
HPA @ Remote1 165.0 W 73.7 W 55%
HPA @ Remote2 61.8 W 51.9 W 16%
HPA @ Remote3 166.4 W 78.6 W 53%
Modulation & CodingQPSK, TPC 3/4 &
8PSK, TPC 7/8
QPSK, TPC 21/44 &
QPSK TPC 3/4
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Option D
Improve Leased Bandwidth saving(compared to Option A), while maintainingAvailability and achieve some HPA savings
Use DoubleTalk Carrier-in-Carrier with QPSK TPC 7/8and 8-PSK TPC 7/8
OriginalWith Doub leTalk
Carrier-in-Carrier
Savings/Improvement
With Carrier-inCarrier
Allocated Bandw idth 56.0 MHz 35.0 MHz
Pow er Eq. Bandw idth 23.7 MHz 16.8 MHzTotal Lease Resource 56.0 MHz 35.0 MHz 38%
Excess Margin 3.7 dB 3.2 dB
HPA @ Hub 15.9 W 9.5 W 40%
HPA @ Remote1 165.0 W 110.0 W 33%
HPA @ Remote2 61.8 W 72.5 W
HPA @ Remote3 166.4 W 125.0 W 25%
Modulation & CodingQPSK, TPC 3/4 &
8PSK, TPC 7/8
QPSK, TPC 7/8 &
8PSK, TPC 7/8
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Spectral Efficiency and Power
DoubleTalk Carrier-in-Carrier provides better spectralefficiency while using lower order modulation and FEC
Traditional 16-QAM, R=7/8 is spectrally equivalent to QPSK,R=7/8 (with CnC)
Lower order modulation provides the saving in transponderpower and HPA power
Allows extremespectral utilization that would not otherwise bepossible
16-QAM, R=7/8 (with CnC) is spectrally equivalent to 256-QAM,
R=7/8, i.e. 7 bps/Hz A customer is currently testing/deploying 16-QAM, R=7/8 with CnC
16-QAM, R=3/4 (with CnC) allows one of our customers to deploy58 T1s in a 36 MHz transponder
DoubleTalk Carrier in Carrier
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DoubleTalk Carrier-in-CarrierDeployment
DoubleTalk Carrier-in-Carrier provides a powerfulmechanism to trade bandwidth andpower
This allows successful deployment of DoubleTalkCarrier-in-Carrier in almost any scenario
Transponder Power/Bandwidth Asymmetry
Traditional Link is Balanced Traditional Link is Bandwidth Limited
Traditional Link is Power Limited
Antenna Size Asymmetry
Data Rate Asymmetry
Upgrading Legacy Bandwidth
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Upgrading Legacy BandwidthLimited Link
Galaxy 10R, C-Band, 13.0 m to 9.15 m
Over 60% saving by upgrading to CDM-Qx withDoubleTalk Carrier-in-Carrier, TPC and 20% Roll-off
Savings
Hub to
Remote
Remote
To HubTotal
Hub to
Remote
Remote
to HubTotal
Data Rate (kbps) 1544 1544 1544 1544Modulation 16-QAM 16-QAM 16-QAM 16-QAM
FEC RS 3/4 RS 3/4 TPC 3/4 TPC 3/4
Carrier Spacing 1.4 1.4 1.2 1.2
Occupied BW (kHZ) 800.0 800.0 1600.0 620.0 620.0 620.0
Power Eq. BW (kHz) 360.0 324.0 684.0 309.6 280.8 590.4
Leased BW (kHz) 1600.0 620.0 61%
Legacy Link (SDM-8000) With DoubleTalk Carrier-in-Carrier
Use Spreading When Traditional Link
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Use Spreading When Traditional Linkis Balanced OR Power Limited
OCCUPIED BW
POWER
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Upgrading Balanced Link
Intelsat 1R, C-Band, 11.0 m to 4.5 m
For balanced links, typical savings is 35-40%
Savings
Hub to
Remote
Remote
o HubTotal
Hub to
Remote
Remote
to HubTotal
Data Rate (kbps) 2048 2048 2048 2048
Modulation 8-PSK 8-PSK QPSK QPSK FEC TPC 3/4 TPC 3/4 TPC 7/8 TPC 7/8
Occupied BW (kHZ) 1300.0 1300.0 2600.0 1675.0 1675.0 1675.0 36%
Power Eq. BW (kHz) 1670.4 842.4 2512.8 975.6 536.4 1512.0 40%
Leased BW (kHz) 2600.0 1675.0 36%
Current Link With DoubleTalk Carrier-in-Carrier
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Upgrading Power Limited Link
Galaxy 10R, Ku-Band, 5.6 m to 2.4 m
Use of Spreading saves Occupied BW, Power
Equivalent BW and HPA Power
Savings
Hub to
Remote
Remote
To HubTotal
Hub to
Remote
Remote
to HubTotal
Data Rate (kbps) 1544 1544 1544 1544Modulation 8-PSK 8-PSK QPSK QPSK
FEC TPC 3/4 TPC 3/4 TPC 7/8 TPC 7/8Occupied BW (kHZ) 961.0 961.0 1922.0 1236.0 1236.0 1236.0
Pow er Eq. BW (kHz) 1368.0 1048.0 2416.0 767.0 533.0 1300.0
Leased BW (kHz) 2416.0 1300.0 46%
Hub HPA (W) 42%
Remote HPA (W) 49%
Original Link
With DoubleTalk Carrier-in-
Carrier
1.2
3.9
0.7
2.0
Upgrading Link With
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Upgrading Link WithAsymmetric Antennas
Hub 9.0 m Antenna Remote 2.4 m Antenna
IS-902, Ku-band
Carrier power ratio is 6 dB (well within spec)
Original Netw orkWith DoubleTalk
Carrier-in-Carrier
Savings/Improvement
With Carrier-inCarrierData Rate 2,048 kbps 2,048 kbps
Allocated Bandw idth 1.8 MHz 1.3 MHz 28%
Power Eq. Bandwidth 1.8 MHz 1.3 MHz 28%
Total Lease Resource 1.8 MHz 1.3 MHz 28%
HPA @ Hub 3.1 W 2.3 W 26%
HPA @ Remote 16.9 W 12.7 W 25%
Modulation & Coding 16-QAM, TPC 3/4 &16-QAM, TPC 7/8
8PSK, TPC 3/4 &8PSK, TPC 7/8
Recent Customer
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Recent CustomerSavings Examples
New Network in Asia175 MHz (Traditional) vs. 125 MHz (CnC)
Annual Savings ~ $600,000 (@ $1,000 / MHz / Month)
Upgrading Existing Network in Africa40% potential saving on 1st transponder (36 MHz)
Annual Savings ~ $520,000 (@ $3,000 / MHz / Month)
44% potential saving on 2nd transponder (54 MHz) Annual Savings ~ $800,000 (@ $2,800 / MHz / Month)
Upgrading Existing Network in Americas38% potential saving on 1st transponder (41 MHz)
Annual Savings ~ $486,000 (@ $2,600 / MHz / Month)
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Myths/Misconceptions
Increases power so cannot be used if original link ispower limited
Spreading converts a power limited link to a bandwidthlimited link
DoubleTalk Carrier-in-Carrier can now be successfullyapplied
Not only saves transponder bandwidth/power but also HPApower
Increases IM
DoubleTalk Carrier-in-Carrier has no direct relation to IM As spreading reduces the total power used by a pair of
carriers, the impact on IM should be negligible
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Myths/Misconceptions (contd)
Increases Latency
DoubleTalk Carrier-in-Carrier has no measurable impact on
latency at any data rate Needs Satellite Operator Approval
DoubleTalk Carrier-in-Carrier has been deployed and/or
tested on all major satellite systems Intelsat/Panamsat
SES/New Skies
Eutelsat
Express Insat
Telecom
Telesat
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Total Cost of Ownership
Simple tools that allow users to quicklycompare DoubleTalk Carrier-in-Carrier withother legacy solutions
A simple Microsoft Excel based tool can bedownloaded from CEFD website
http://www.comtechefdata.com/toolstco.asp
For more detailed calculations, use the web basedtool
http://optimize.comtechefdata.com
http://www.comtechefdata.com/toolstco.asphttp://optimize.comtechefdata.com/http://optimize.comtechefdata.com/http://www.comtechefdata.com/toolstco.asp -
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Monthly Leased Bandwidth &
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Monthly Leased Bandwidth &Savings
Monthly Leased BW (MHz)
(Optimal Bandwidth Link)
0.00
0.50
1.00
1.50
2.00
2.50
3.00
3.50
MyModem CDM-600 w/LDPC CDM-Qx w/Carrier-
in-Carrier
Monthly BW Savings
$-
$500
$1,000
$1,500
$2,000
$2,500
$3,000
$3,500
$4,000
CDM-600 w/LDPC CDM-Qx w/Carrier-in-Carrier
HPA/BUC Size Reduction
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HPA/BUC Size Reduction(While Using Less Bandwidth than the Original Link )
The DoubleTalk Carrier-in-Carrier link, while
using 10% lessbandwidth compared tooriginal link
Reduces transmit powerby 54% (Hub to Remote)
Reduces transmit powerby 38% (Remote to Hub)
Increase Throughput
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Increase Throughput(While Using Same Bandwidth as the Original Link)
The DoubleTalk Carrier-in-Carrier link, while
using same bandwidthas compared to originallink
Increase throughput by58% in both directions
Increase Link Margin
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Increase Link Margin(While Using Same Bandwidth as the Original Link)
The DoubleTalk Carrier-in-Carrier link, while
using same bandwidthas compared to originallink
Increases link margin by2.9 dB (Hub to Remote)
Increases link margin by2.6 dB (Remote to Hub)
Financial Metrics
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Financial Metrics(Total Savings & Total Cost Compared To Original Link)
Life Time Savings
(Net Present Value)
$-
$20,000
$40,000
$60,000
$80,000
$100,000
$120,000
$140,000
$160,000
CDM-600 w/LDPC CDM-Qx w/Carrier-in-Carrier
Lifetime Total Cost(Net Present Value)
$-
$50,000
$100,000
$150,000
$200,000
$250,000
$300,000
$350,000
$400,000
$450,000
$500,000
MyModem CDM-600 w/LDPC CDM-Qx
w/Carrier-in-
Carrier
Conclusions
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Conclusions
When properly deployed, DoubleTalk Carrier-in-Carrier can provide unprecedented savings
For T1/E1 rates and higher
New installations can have a payback period of as
little as 0 to 3 monthsModem Replacement
Legacy modem (non TPC) replacement can break evenin as little as 1 to 2 months
TPC Modem replacement can break even in as little as 2to 4 months
Typical Applications
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Typical Applications
Cellular backhaul
High speed trunking
Offshore
communications Limited rack space
installations
CDM Qx Overview
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CDM-Qx Overview
Modular multi-channel satellite modem in 1 RUchassis
DoubleTalk Carrier-in-Carrier bandwidth compression Data rates up to 20 Mbps
Viterbi, Concatenated Reed Solomon and 2nd
generation Turbo Product Codes (TPC) 70/140 MHz or L-Band IF
EIA-422, Sync EIA-232, V.35, HSSI, G.703 T1, G.703
E1, G.703 E2 and Quad-E1 data interface D&I++ for G.703 E1 & Quad-E1
Legacy and Standards based monitoring & control
External & Limited Internal redundancy options
Architecture
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Architecture
A CDM-Qx consists of:
A chassis
1 RU size 4-slots per chassis, each
capable of holding a modulatoror a demodulator card
Power supply
M&C board with EIA-232/485and 10/100BaseT Ethernet port
Tx IF, Rx IF and Ref
Combination of Modulator and/or
Demodulator cards Data interface
Optional TPC encoder/decoder
Power SupplyDigital & IFBackplanes
M&C
4 Slots
Modulator
IF Interface
Note: Quad-E1 requires 2 chassis slots
CDM Qx Chassis
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CDM-Qx Chassis
Valid Configurations (per Chassis) are 1 to 4 Modulators
1 to 4 Demodulators
1 Modem 2 Modems in 1:1 configuration (i.e. only 1 modem is online at a time)
DoubleTalk Carrier-in-Carrier license (option)
CDM-Qx: 50 to 90, 100 to 180 MHz 75 ohm, BNC
50 ohm, BNC (option)
CDM-QxL: 950 to 1950 MHz 50 ohm, Type-N Female
Primary power supply 100-240 VAC or 48 VDC
BUC Power Supply option (CDM-QxL)
Internal redundancy options for modulator and/or demodulator card
DoubleTalk Carrier-in-Carrier
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Licensing
Must be configured as a Modem
Requires 1 license per Modem Available tiers
Up to 512 kbps
Up to 1 Mbps
Up to 2.5 Mbps
Up to 5 MbpsUp to 10 Mbps
Up to 20 Mbps
Special Licensing Rules - 1:1
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Internal Redundancy
Even when a chassis is configured for 1:1 internalmodem redundancy, 2 licenses are required
Max Data RateRequired (kbps)
Online ModemLicense
Backup ModemLicense
512 kbps 512 kbps 512 kbps
1 Mbps 1 Mbps 1 Mbps
2.5 Mbps 2.5 Mbps 2.5 Mbps
5 Mbps 5 Mbps 2.5 Mbps
10 Mbps 10 Mbps 2.5 Mbps20 Mbps 20 Mbps 2.5 Mbps
Demo Mode
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Demo Mode
The CDM-Qx supports a Demo Mode whichallows users to test the DoubleTalk Carrier-in-
Carrier capability In the Demo Mode, DoubleTalk Carrier-in-
Carrier can be used for up to 45 days
The 45 day countdown timer can be turned ONand OFF as many times as needed
Up to 10 Mbps operation on 1st Modem
Up to 2.5 Mbps operation on the 2nd Modem Up to 10 Mbps operation if used in a 1:1
Internally Redundant configuration
Modulator/Demodulator
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Modulator/Demodulator
Separate card for Modulator and Demodulator
L-band or 70/140 MHz
Cannot mix-and-match in a chassis Transmit/Receive data rate
Up to 5 Mbps (standard)
Up to 10 Mbps (FAST option)
Up to 20 Mbps (FAST option)
Independently selectable for each Modulator/Demodulator
Modulation/Demodulation
BPSK, QPSK (standard) 8-PSK (FAST option)
16-QAM (FAST option)
Independently selectable for each Modulator/Demodulator
Modulator/Demodulator (contd)
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Modulator/Demodulator (cont d)
FEC Encoding/Decoding Viterbi (standard)
Concatenated Reed-Solomon (standard) Comtech (220, 200)
EF Data Closed (225, 205)
IESS-310 8PSK/TCM (219, 201)
2nd Gen TPC Encoder/Decoder card (hardware option) Up to 5 Mbps (included with hardware)
Up to 10 Mbps (FAST option)
Up to 20 Mbps (FAST option)
Each Modulator or Demodulator requires a separate 2nd GenTPC Encoder/Decoder card
Independently selectable for each Modulator/Demodulator
Modulator/Demodulator (contd)
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Modulator/Demodulator (cont d)
Data interface (hardware selection) EIA-422/232/V.35 (D25)
EIA-422 up to 12 Mbps V.35 up to 12 Mbps
HSSI Up to 20 Mbps
G.703 T1/E1 Balanced (D15) G.703 T1/E1 Unbalanced (BNC)
G.703 E2 Unbalanced (BNC)
Select one per Modem (i.e. Modulator and Demodulator cardcombination) OR one per Modulator card and Demodulatorcard if using independently In case of Modem, only the Demodulator card requires an
interface
Enhanced D&I++
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Enhanced D&I++
Available with G.703 E1 data interfaceSupported for E1-CCS only
Any combination of 1 to 31 time slots can beselected
Simultaneous use of EDMAC and AUPC
Low overhead2.2% including EDMAC and AUPC
Interoperable with CDM-600/CDM-600LFor up to 24 slotsViterbi and TPC FEC only
Quad E1 Interface (QDI)
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Quad E1 Interface (QDI)
Quad-E1 interface aggregates up to 4 fulland/or fractional E1s into a single satellite
carrierEliminates multi-carrier backoff for HPA/BUC
Generally 50% or more reduction in HPA/BUC size
Reduction in number of modems requiredReduction in rack space
Quad-E1 Module
RJ-45 connector for each E1 (balanced)Requires 2 slots in the chassis
The other 2 slots must be occupied by a modem
Quad-E1 Interface (QDI) (contd)
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Quad E1 Interface (QDI) (cont d)
Independent D&I++ For Each E1 Allows for Dropping or Inserting any combination of 1 to 31
Time Slots on each E1 Aggregate, 1 to 128 Time Slots
E1-CCS only
Very Low Overhead 0.4% EDMAC/AUPC overhead is additional (if used)
Extremely efficient compared to 6.67% required by IBS
Clocking/Synchronization
All 4 E1 must have same clock source
QDI only interoperates with another QDI at the otherend
FEC, Modulation & Data RateS (U f d O ti )
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Summary (Unframed Operation)FEC Type Modulation Code Rate Data Rate Range
Viterbi BPSK Rate 1/2 32 kbps - 5 Mbps
Viterbi QPSK Rate 1/2 32 kbps - 10 Mbps
Viterbi QPSK Rate 3/4 32 kbps - 15 Mbps
Viterbi QPSK Rate 7/8 32 kbps - 17.5 Mbps
Viterbi + RS (201/219) BPSK Rate 1/2 32 kbps - 4.5 Mbps
Viterbi + RS (201/219) QPSK Rate 1/2 32 kbps - 9.1 Mbps
Viterbi + RS (201/219) QPSK Rate 3/4 32 kbps - 13.7 Mbps
Viterbi + RS (201/219) QPSK Rate 7/8 32 kbps - 16 Mbps
Viterbi + RS (201/219) 16-QAM Rate 3/4 352.4 kbps - 20 Mbps
Viterbi + RS (201/219) 16-QAM Rate 7/8 411.1 kbps - 20Mbps
TCM + RS (201/219) 8-PSK Rate 2/3 234.9 kbps - 18.3 Mbps
TPC BPSK Rate 5/16 32 kbps - 3.1 Mbps
TPC BPSK Rate 21/44 32 kbps - 4.7 Mbps
TPC QPSK Rate 21/44 32 kbps - 9.5 Mbps
TPC QPSK Rate 3/4 32 kbps - 15 Mbps
TPC QPSK Rate 7/8 32 kbps - 17.5 MbpsTPC QPSK Rate 17/18 32 kbps - 18.8 Mbps
TPC 8-PSK Rate 3/4 288 kbps - 20 Mbps
TPC 8-PSK Rate 7/8 336 kbps - 20 Mbps
TPC 8-PSK Rate 17/18 362.7 kbps - 20 Mbps
TPC 16-QAM Rate 3/4 384 kbps - 20 Mbps
TPC 16-QAM Rate 7/8 448 kbps - 20 Mbps
EDMAC and AUPC
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Embedded Distant End Monitoring & Control
Supports EDMAC and EDMAC-2 framing
EDMAC Interoperable with CDM-600/CDM-600L and
CDM-570/CDM-570L
EDMAC-2
Interoperable with CDM-570/CDM-570L
Automatic Uplink Power Control
Interoperable with CDM-600/CDM-600L (EDMAC framing)
Interoperable with CDM-570/CDM-570L (EDMAC orEDMAC-2 framing)
Internal Redundancy ForModulator/Demodulator Card(s)
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Modulator/Demodulator Card(s)
CDM-Qx can provide redundancy for modulatorand/or demodulator card(s) within the chassiswithout requiring an external switch 1:1 Redundancy for Modulator & Demodulator card when
configured as a Modem
1:1, 1:2 or 1:3 Redundancy when using Modulators Only
or Demodulators Only It ONLY protects against a failure in the modulator
and/or demodulator card
No protection against failures in Data Interface,M&C module or other common sub-systems in thechassis
For critical links, use of external redundancy is
strongly recommended
Management
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g
CDM-Qx can be managed through Modem front panel
Menu driven, easy to operate, user interface via keypad anddisplay
Nested menus provide access to all M&C functions
Remote M&C port
EIA-232 or EIA-485 operation Remote commands provide access to all M&C functions
10/100BaseT Ethernet port Configuration and management using TCP/IP based protocols
SNMP Web browser (http)
telnet
Access to all M&C functions
M&C Screens (Web Based)
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( )
Modem
configuration
M&C Screens (Web Based)
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( )
Modulator & Demodulatorconfiguration
Spectrum Analyzer Function
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One of the demodulators can be used to viewthe spectrum or the constellation map
When viewing spectrum, the demodulator is notavailable for user data
Available through a stand alone MS Windowsapplication or a web browser
Windows application can be downloaded from
Comtech EF Datas web site
Spectrum Analyzer (Windows App)
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p y ( pp)
Spectrum Analyzer (Web Based)
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Additional Features
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Rolloff ()
20% and 35%
External Redundancy Options
1:10 redundancy switch
CRS-300-Qx1:1 redundancy switch
CRS-311-Qx
Configuration Example 1
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CDM-Qx with DoubleTalk Carrier-in-Carrier tosupport 1 T1
Chassis 1
DoubleTalk Carrier-in-Carrier license 128 ksps to 2.5 Mbps
Modulator 1
8-PSK Modulation (if needed)
2nd Gen TPC encoder up to 5 Mbps
Demodulator 1
8-PSK Demodulation (if needed)
2nd Gen TPC decoder up to 5 Mbps
G.703 T1 Interface 1
Configuration Example 2
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CDM-Qx with DoubleTalk Carrier-in-Carrier tosupport 4 E1
Chassis 1 DoubleTalk Carrier-in-Carrier license 128 ksps to 10 Mbps
Modulator 1
8-PSK Modulation (if needed) 2nd Gen TPC encoder up to 10 Mbps
Demodulator 1 8-PSK Demodulation (if needed)
2nd Gen TPC decoder up to 10 Mbps
Quad E1 Data Interface 1
Configuration Example 3
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CDM-Qx with DoubleTalk Carrier-in-Carrier to support 20 Mbpsfull-duplex, 1:1 internally redundant Chassis 1
DoubleTalk Carrier-in-Carrier license 128 ksps to 20 Mbps (online) DoubleTalk Carrier-in-Carrier license 128 ksps to 2.5 Mbps (backup)
1:1 redundancy
Modulator 2, each with
8-PSK/16QAM Modulation (if needed) 2nd Gen TPC encoder up to 20 Mbps
Data rate up to 20 Mbps
Demodulator 2, each with
8-PSK/16QAM Demodulation (if needed) 2nd Gen TPC decoder up to 20 Mbps
Data rate up to 20 Mbps
HSSI interface 1
Conclusions
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CDM-Qx with DoubleTalk Carrier-in-Carriercan
Reduce OPEX
Reduce CAPEX
Increase link availability (i.e. margin) Increase throughput
Typical payback period of 0 to 3 months
Significant OPEX savings there after
Modem Accessories
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Variety of accessories to enhance the functionality ofour satellite modems
1:1 and 1:N Redundancy Switches Provides fully automaticor manual protection of circuits
Performance Enhancement Proxies Accelerates the TCPtraffic over impaired satellite links
Comtech Monitor & Control System Provides management ofComtech EF Data equipment (modems, transceivers,converters and redundancy switches)
And, more
Comtech EF Data
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Delivers global services and support
Specializes in solutions that optimize
satellite communications Has technologically advanced infrastructureproducts installed in more than 160countries
Provides around the clock customersupport
Has authorized service centers around theworld
Is prepared to help you: Optimize satellite communications Minimize operating expenses
Maximize transponder utilization
Lower the total cost of ownership
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ADVANCED COMMUNICATION SOLUTIONS
Contact Us:Contact Us:
2114 West 7th Street2114 West 7th Street
Tempe, AZ 85281Tempe, AZ 85281
USAUSATel 1.480.333.2200Tel 1.480.333.2200
FAX 1.480.333.2540FAX 1.480.333.2540
[email protected]@comtechefdata.com
www.comtechefdata.comwww.comtechefdata.com