advanced communication solutions

ADVANCED COMMUNICATION SOLUTIONS

CDMCDM--Qx/QxL Satellite Modem Qx/QxL Satellite Modem withwith

DoubleTalkDoubleTalkTMTM CarrierCarrier--inin--CarrierCarrier®®

The Most Bandwidth Efficient Modem Ever !The Most Bandwidth Efficient Modem Ever !

November 2007November 2007

2

Agenda

• DoubleTalk Carrier-in-Carrier Overview

• Business Case - Why use CDM-Qx/QxL with DoubleTalk Carrier-in-Carrier ?

• CDM-Qx/QxL Overview– Architecture– Features– Configuration

DoubleTalk is a Trademark of Applied Signal TechnologyCarrier-in-Carrier is a Registered Trademark of Comtech EF Data

All specifications are subject to change without notice.

3

Traditional SATCOM Optimization

• Traditionally, you could reduce Bandwidth orPower, but not both without significantly increasing the CAPEX– Reduce Occupied Bandwidth

Use Higher Order Modulation– Increases Transponder Power Utilization– Increases BUC/HPA Size and/or Antenna Size

– Reduce Transponder Power UtilizationUse Lower Order Modulation

– Increases Occupied Bandwidth– Reduces BUC/HPA Size and/or Antenna Size

Without Using Lower Order Modulation – Increase Antenna Size

4

Traditional SATCOM Optimization

• Reduce BUC/HPA Size– Use Lower Order Modulation

Increases Occupied Bandwidth

– Without Using Lower Order ModulationIncrease Antenna Size

• Reduce Antenna Size– Use Lower Order Modulation

Increases Occupied Bandwidth

– Without Using Lower Order ModulationIncreases Transponder PowerIncreases BUC/HPA Size

5

Multi Dimensional Optimization

• DoubleTalk Carrier-in-Carrier combined with proper Modulation and FEC, makes it possible to optimize satellite communications like never before– Reduce 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

6

DoubleTalk Carrier-in-Carrier

• Based on Applied Signal Technology’s (APSG) DoubleTalk™ bandwidth compression system – Uses patented “Adaptive

Cancellation” – Allows full duplex satellite links to

transmit concurrently in the same segment of transponder bandwidth

– Delivers unprecedented savings when combined with Comtech EF Data’s advanced Forward Error Correction and Modulation techniques

Without DoubleTalk Carrier-in-Carrier

With DoubleTalk Carrier-in-Carrier

7

DoubleTalk Carrier-in-Carrier Theory 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

8

Theory of Operation (cont’d)

• 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 delayed transmitted signal from the composite received signal– Nominal 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

9

Eb/No Degradation - QPSK

• Very low degradation when using QPSKEb/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/N

o D

egra

datio

n (d

B)

QPSK, TPC 17/18

QPSK, TPC 3/4

QPSK, TPC 21/44

QPSK, TPC 7/8

10

Eb/No Degradation – 8-PSK

• Low degradation except for TPC, Rate 17/18Eb/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


Eb/N

o D

egra

datio

n (d

B)

8-PSK, TCM 2/3

8-PSK, TPC 7/8

8-PSK, TPC 3/4

8-PSK, TPC 17/18

11

Eb/No Degradation – 16-QAM

• Low degradation for TPC, Rate 3/4Eb/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


Eb/N

o D

egra

datio

n (d

B)

16-QAM, TPC 3/4

16-QAM, TPC 7/8

12

DoubleTalk Carrier-in-Carrier Operational 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 be able 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

13

Optimization Tradeoffs

• With proper selection of Modulation and FEC, DoubleTalk Carrier-in-Carrier can be used to achieve multi-dimensional optimization

• The following slides show an existing network and the optimization possibilities

14

Optimization Tradeoffs Example

• 4 site Network with 23 E1s between Hub and Remotes

Original NetworkModulation & Coding QPSK, TPC 3/4 & 8PSK, TPC 7/8Allocated Bandwidth 56.0 MHzPower Eq. Bandwidth 23.7 MHzTotal Lease Resource 56.0 MHzExcess Margin 3.7 dBHPA @ Hub 15.9 WHPA @ Remote1 165.0 WHPA @ Remote2 61.8 WHPA @ Remote3 166.4 W

15

Option A(Optimize Everything)

• Reduce Leased Bandwidth and CAPEX and increase Availability

Use DoubleTalk Carrier-in-Carrier with QPSK TPC 7/8

OriginalWith DoubleTalk Carrier-in-Carrier

Savings/Improvement With Carrier-inCarrier

Allocated Bandwidth 56.0 MHz 37.7 MHz 33%Power Eq. Bandwidth 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 WHPA @ Remote3 166.4 W 101.5 W 39%

QPSK, TPC 3/4 & 8PSK, TPC 7/8

Modulation & Coding QPSK, TPC 7/8

16

Option B(Maximize OPEX Saving)

• Maximize Leased Bandwidth savingUse DoubleTalk Carrier-in-Carrier with 8-PSK TPC 3/4 and 8-PSK TPC 7/8



Allocated Bandwidth 56.0 MHz 28.4 MHzPower Eq. Bandwidth 23.7 MHz 25.9 MHzTotal Lease Resource 56.0 MHz 28.4 MHz 49% saving in Leased BWExcess Margin 3.7 dB 0.5 dBHPA @ Hub 15.9 W 15.6 WHPA @ Remote1 165.0 W 166.5 WHPA @ Remote2 61.8 W 119.0 WHPA @ Remote3 166.4 W 175.0 W

Modulation & CodingQPSK, TPC 3/4 & 8PSK, TPC 7/8

8PSK, TPC 3/4 & 8PSK, TPC 7/8

17

Option C(Maximize Availability & Save CAPEX)

• Increase Availability (margin) while saving CAPEX

Use DoubleTalk Carrier-in-Carrier with QPSK TPC 21/44 and QPSK TPC 3/4



Allocated Bandwidth 56.0 MHz 56.0 MHzPower Eq. Bandwidth 23.7 MHz 12.4 MHzTotal Lease Resource 56.0 MHz 56.0 MHzExcess 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%


QPSK, TPC 21/44 & QPSK TPC 3/4

18

Option D

• Improve Leased Bandwidth saving (compared to Option A), while maintaining Availability and achieve some HPA savings

Use DoubleTalk Carrier-in-Carrier with QPSK TPC 7/8 and 8-PSK TPC 7/8



Allocated Bandwidth 56.0 MHz 35.0 MHzPower Eq. Bandwidth 23.7 MHz 16.8 MHzTotal Lease Resource 56.0 MHz 35.0 MHz 38%Excess Margin 3.7 dB 3.2 dBHPA @ Hub 15.9 W 9.5 W 40%HPA @ Remote1 165.0 W 110.0 W 33%HPA @ Remote2 61.8 W 72.5 WHPA @ Remote3 166.4 W 125.0 W 25%


QPSK, TPC 7/8 & 8PSK, TPC 7/8

19

Spectral Efficiency and Power

• DoubleTalk Carrier-in-Carrier provides better spectral efficiency 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 transponder power and HPA power

– Allows extreme spectral utilization that would not otherwise be possible

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 CnC16-QAM, R=3/4 (with CnC) allows one of our customers to deploy 58 T1s in a 36 MHz transponder

20

DoubleTalk Carrier-in-Carrier Deployment

• DoubleTalk Carrier-in-Carrier provides a powerful mechanism to trade bandwidth and power

• This allows successful deployment of DoubleTalk Carrier-in-Carrier in almost any scenario– Transponder Power/Bandwidth Asymmetry

Traditional Link is BalancedTraditional Link is Bandwidth LimitedTraditional Link is Power Limited

– Antenna Size Asymmetry– Data Rate Asymmetry

21

Upgrading Legacy Bandwidth Limited Link

• Galaxy 10R, C-Band, 13.0 m to 9.15 m

• Over 60% saving by upgrading to CDM-Qx with DoubleTalk Carrier-in-Carrier, TPC and 20% Roll-off

Savings

Hub to Remote

Remote To Hub

TotalHub to Remote

Remote to Hub

Total

Data Rate (kbps) 1544 1544 1544 1544Modulation 16-QAM 16-QAM 16-QAM 16-QAMFEC RS 3/4 RS 3/4 TPC 3/4 TPC 3/4Carrier Spacing 1.4 1.4 1.2 1.2Occupied BW (kHZ) 800.0 800.0 1600.0 620.0 620.0 620.0Power Eq. BW (kHz) 360.0 324.0 684.0 309.6 280.8 590.4Leased BW (kHz) 1600.0 620.0 61%

Legacy Link (SDM-8000)With DoubleTalk Carrier-in-

Carrier

22

Use Spreading When Traditional Link is Balanced OR Power Limited

OCCUPIED BW

POW

ER

23

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 To Hub

TotalHub to Remote

Remote to Hub

Total

Data Rate (kbps) 2048 2048 2048 2048Modulation 8-PSK 8-PSK QPSK QPSKFEC TPC 3/4 TPC 3/4 TPC 7/8 TPC 7/8Occupied 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 LinkWith DoubleTalk Carrier-in-

Carrier

24

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 Hub

TotalHub to Remote

Remote to Hub

Total

Data Rate (kbps) 1544 1544 1544 1544Modulation 8-PSK 8-PSK QPSK QPSKFEC TPC 3/4 TPC 3/4 TPC 7/8 TPC 7/8Occupied BW (kHZ) 961.0 961.0 1922.0 1236.0 1236.0 1236.0Power Eq. BW (kHz) 1368.0 1048.0 2416.0 767.0 533.0 1300.0Leased BW (kHz) 2416.0 1300.0 46%

Hub HPA (W) 42%Remote HPA (W) 49%

Original LinkWith DoubleTalk Carrier-in-

Carrier

1.23.9

0.72.0

25

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 NetworkWith DoubleTalk Carrier-in-Carrier


Data Rate 2,048 kbps 2,048 kbps

Allocated Bandwidth 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 & Coding16-QAM, TPC 3/4 & 16-QAM, TPC 7/8

8PSK, TPC 3/4 & 8PSK, TPC 7/8

26

Recent Customer Savings Examples

• New Network in Asia– 175 MHz (Traditional) vs. 125 MHz (CnC)

Annual Savings ~ $600,000 (@ $1,000 / MHz / Month)

• Upgrading Existing Network in Africa– 40% potential saving on 1st transponder (36 MHz)

Annual Savings ~ $520,000 (@ $3,000 / MHz / Month)– 44% potential saving on 2nd transponder (54 MHz)


• Upgrading Existing Network in Americas– 38% potential saving on 1st transponder (41 MHz)


27

Myths/Misconceptions

• Increases power so cannot be used if original link is power limited– Spreading converts a power limited link to a bandwidth

limited link– DoubleTalk Carrier-in-Carrier can now be successfully

appliedNot only saves transponder bandwidth/power but also HPA power

• 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

28

Myths/Misconceptions (cont’d)

• 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 systemsIntelsat/PanamsatSES/New SkiesEutelsatExpressInsatTelecomTelesat

29

Total Cost of Ownership

• Simple tools that allow users to quickly compare DoubleTalk Carrier-in-Carrier with other legacy solutions– A simple Microsoft Excel based tool can be

downloaded from CEFD website http://www.comtechefdata.com/toolstco.asp

– For more detailed calculations, use the web based tool

http://optimize.comtechefdata.com

http://www.comtechefdata.com/toolstco.asp

http://optimize.comtechefdata.com/

31

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

32

HPA/BUC Size Reduction(While Using Less Bandwidth than the Original Link )

• The DoubleTalk Carrier-in-Carrier link, while using 10% less bandwidth compared to original link– Reduces transmit power

by 54% (Hub to Remote)– Reduces transmit power

by 38% (Remote to Hub)

33

Increase Throughput(While Using Same Bandwidth as the Original Link)

• The DoubleTalk Carrier-in-Carrier link, while using same bandwidth as compared to original link– Increase throughput by

58% in both directions

34

Increase Link Margin(While Using Same Bandwidth as the Original Link)

• The DoubleTalk Carrier-in-Carrier link, while using same bandwidth as compared to original link– Increases link margin by

2.9 dB (Hub to Remote)– Increases link margin by

2.6 dB (Remote to Hub)

35

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-Qxw/Carrier-in-

Carrier

36

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 months– Modem Replacement

Legacy modem (non TPC) replacement can break even in as little as 1 to 2 monthsTPC Modem replacement can break even in as little as 2 to 4 months

37

Typical Applications

• Cellular backhaul• High speed trunking• Offshore

communications• Limited rack space

installations

38

CDM-Qx Overview

• Modular multi-channel satellite modem in 1 RU chassis

• 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

39

Architecture

• A CDM-Qx consists of:– A chassis

1 RU size4-slots per chassis, each capable of holding a modulator or a demodulator cardPower supplyM&C board with EIA-232/485 and 10/100BaseT Ethernet portTx IF, Rx IF and Ref

– Combination of Modulator and/or Demodulator cards

Data interfaceOptional TPC encoder/decoder

Power SupplyDigital & IFBackplanes

M&C

4 Slots

Modulator

IF Interface

Note: Quad-E1 requires 2 chassis slots

40

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

41

DoubleTalk Carrier-in-Carrier 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 Mbps– Up to 10 Mbps– Up to 20 Mbps

42

Special Licensing Rules - 1:1 Internal Redundancy

• Even when a chassis is configured for 1:1 internal modem redundancy, 2 licenses are required

Max Data Rate Required (kbps)

Online Modem License

Backup Modem License

512 kbps 512 kbps 512 kbps1 Mbps 1 Mbps 1 Mbps

2.5 Mbps 2.5 Mbps 2.5 Mbps5 Mbps 5 Mbps 2.5 Mbps10 Mbps 10 Mbps 2.5 Mbps20 Mbps 20 Mbps 2.5 Mbps

43

Demo Mode

• The CDM-Qx supports a Demo Mode which allows 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 ON

and 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

44

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

45

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 Gen TPC Encoder/Decoder cardIndependently selectable for each Modulator/Demodulator

46

Modulator/Demodulator (cont’d)

• Data interface (hardware selection)– EIA-422/232/V.35 (D25)

EIA-422 up to 12 MbpsV.35 up to 12 Mbps

– HSSIUp 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 card

combination) OR one per Modulator card and Demodulator card if using independently

In case of “Modem”, only the Demodulator card requires an interface

47

Enhanced D&I++

• Available with G.703 E1 data interface– Supported for E1-CCS only

• Any combination of 1 to 31 time slots can be selected

• Simultaneous use of EDMAC and AUPC• Low overhead

– 2.2% including EDMAC and AUPC• Interoperable with CDM-600/CDM-600L

– For up to 24 slots– Viterbi and TPC FEC only

48

Quad E1 Interface (QDI)

• Quad-E1 interface aggregates up to 4 full and/or fractional E1’s into a single satellite carrier– Eliminates multi-carrier backoff for HPA/BUC

Generally 50% or more reduction in HPA/BUC size– Reduction in number of modems required– Reduction 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”

49

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 other end

50

FEC, Modulation & Data Rate Summary (Unframed Operation)

FEC Type Modulation Code Rate Data Rate RangeViterbi BPSK Rate 1/2 32 kbps - 5 MbpsViterbi QPSK Rate 1/2 32 kbps - 10 MbpsViterbi QPSK Rate 3/4 32 kbps - 15 MbpsViterbi QPSK Rate 7/8 32 kbps - 17.5 Mbps

Viterbi + RS (201/219) BPSK Rate 1/2 32 kbps - 4.5 MbpsViterbi + RS (201/219) QPSK Rate 1/2 32 kbps - 9.1 MbpsViterbi + RS (201/219) QPSK Rate 3/4 32 kbps - 13.7 MbpsViterbi + RS (201/219) QPSK Rate 7/8 32 kbps - 16 MbpsViterbi + RS (201/219) 16-QAM Rate 3/4 352.4 kbps - 20 MbpsViterbi + RS (201/219) 16-QAM Rate 7/8 411.1 kbps - 20MbpsTCM + 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 MbpsTPC 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 Mbps TPC 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

51

EDMAC and AUPC

• Embedded Distant End Monitoring & Control– Supports EDMAC and EDMAC-2 framing– EDMAC

Interoperable with CDM-600/CDM-600L andCDM-570/CDM-570L

– EDMAC-2Interoperable with CDM-570/CDM-570L

• Automatic Uplink Power Control– Interoperable with CDM-600/CDM-600L (EDMAC framing)– Interoperable with CDM-570/CDM-570L (EDMAC or

EDMAC-2 framing)

52

Internal Redundancy For Modulator/Demodulator Card(s)

• CDM-Qx can provide redundancy for modulator and/or demodulator card(s) within the chassis without 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 the chassis

• For critical links, use of external redundancy is strongly recommended

53

Management

• CDM-Qx can be managed through– Modem front panel

Menu driven, easy to operate, user interface via keypad and display Nested menus provide access to all M&C functions

– Remote M&C port EIA-232 or EIA-485 operationRemote commands provide access to all M&C functions

– 10/100BaseT Ethernet portConfiguration and management using TCP/IP based protocols

– SNMP– Web browser (http)– telnet

Access to all M&C functions

54

M&C Screens (Web Based)

• Modem configuration

55

M&C Screens (Web Based)

• Modulator & Demodulator configuration

56

Spectrum Analyzer Function

• One of the demodulators can be used to view the spectrum or the constellation map– When viewing spectrum, the demodulator is not

available for user data• Available through a stand alone MS Windows

application or a web browser– Windows application can be downloaded from

Comtech EF Data’s web site

57

Spectrum Analyzer (Windows App)

58

Spectrum Analyzer (Web Based)

59

Additional Features

• Rolloff (α) – 20% and 35%

• External Redundancy Options– 1:10 redundancy switch

CRS-300-Qx

– 1:1 redundancy switchCRS-311-Qx

60

Configuration Example 1

• CDM-Qx with DoubleTalk Carrier-in-Carrier to support 1 T1– Chassis – 1

DoubleTalk Carrier-in-Carrier license – 128 ksps to 2.5 Mbps

– Modulator – 18-PSK Modulation (if needed)2nd Gen TPC encoder up to 5 Mbps

– Demodulator – 18-PSK Demodulation (if needed)2nd Gen TPC decoder up to 5 MbpsG.703 T1 Interface – 1

61


• CDM-Qx with DoubleTalk Carrier-in-Carrier to support 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 – 18-PSK Demodulation (if needed)2nd Gen TPC decoder up to 10 Mbps

– Quad E1 Data Interface – 1

62


• CDM-Qx with DoubleTalk Carrier-in-Carrier to support 20 Mbps full-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 with8-PSK/16QAM Modulation (if needed)2nd Gen TPC encoder up to 20 MbpsData rate up to 20 Mbps

– Demodulator – 2, each with8-PSK/16QAM Demodulation (if needed)2nd Gen TPC decoder up to 20 MbpsData rate up to 20 MbpsHSSI interface – 1

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Conclusions

• CDM-Qx with DoubleTalk Carrier-in-Carrier can– 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

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Modem Accessories

• Variety of accessories to enhance the functionality of our satellite modems – 1:1 and 1:N Redundancy Switches – Provides fully automatic

or manual protection of circuits – Performance Enhancement Proxies – Accelerates the TCP

traffic over impaired satellite links – Comtech Monitor & Control System – Provides management of

Comtech EF Data equipment (modems, transceivers, converters and redundancy switches)

– And, more

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Comtech EF Data

• Delivers global services and support• Specializes in solutions that optimize

satellite communications• Has technologically advanced infrastructure

products installed in more than 160 countries

• Provides “around the clock” customer support

• Has authorized service centers around the world

• Is prepared to help you:– Optimize satellite communications– Minimize operating expenses– Maximize transponder utilization– Lower the total cost of ownership

ADVANCED COMMUNICATION SOLUTIONS

Contact Us:Contact Us:2114 West 7th Street2114 West 7th Street

Tempe, AZ 85281Tempe, AZ 85281USAUSA

Tel 1.480.333.2200Tel 1.480.333.2200FAX 1.480.333.2540FAX 1.480.333.2540

[email protected]@comtechefdata.comwww.comtechefdata.comwww.comtechefdata.com

advanced communication solutions

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