Satellite Modems CDM-625-EN Advanced Satellite Modem with
Contents
1. Satellite News Gathering www comtechefdata com Doubletalk Carrier In Carrier DoubleTalk Carrier in Carrier based on patented Adaptive Cancellation technology allows transmit and receive carriers of a duplex link to share the same transponder space Figure 1 shows the typical full duplex satellite link where the two carriers are adjacent to each other Figure 2 shows the typical DoubleTalk Carrier in Carrier operation where the two carriers are overlapping thus sharing the same spectrum RL 45 00 d8m MKR 1 FRQ 78 888 NHz RL 45 00 dBm i ATTEN i0 dB F53 48 dBm ATTEN 10 dB Composite 5 88 a8701V ae 3 294 98 019 ee Carrier 1 ane p w oh 0 spe Mie aaps aaa a VIDEO BANDWIDTH em i EPE I ml 1g E or MHz T XT if f f Yi 100 Hz i f f g f j A fi 4 l l kodi ll l K i f Hi j i i i 1 I4 Carrier 1 Carrier 2 Carrier 2 H 4 j _ Need e POPER ENT O Aranana kept CENTER 78 585 MHz SPAN 2 880 MHz CENTER 78 080 MHz SPAN 2 800 MHz RB 21 5 kHz VB 30 0 Hz T 9 382 se RB 21 5 kHz VB 108 Hz bt e 7oi s Figure 1 Traditional Full Duplex Link Figure 2 Duplex Link with DoubleTalk Carrier in Carrier When observed on a spectrum analyzer only the Composite is visible Carrier 1 and Carrier 2 are shown in Figure 2 for reference only DoubleTalk Carrier in Carrier is complementary to all advances in modem technology including2. advanced FEC and modulation techniques As these technologies approach theoretical limits of power and bandwidth efficiencies DoubleTalk Carrier in Carrier utilizing advanced signal processing techniques provides a new dimension in bandwidth efficiency As DoubleTalk Carrier in Carrier allows equivalent spectral efficiency using a lower order modulation and or FEC Code it can simultaneously reduce CAPEX by allowing a smaller BUC HPA and or antenna Alternatively DoubleTalk Carrier in Carrier can be used to achieve very high spectral efficiencies E g DoubleTalk Carrier in Carrier when used with 16 QAM approaches the bandwidth efficiency of 256 QAM 8 bps Hz When combined with VersaFEC or LDPC TPC it can provide unprecedented savings in transponder bandwidth and power utilization This allows for its successful deployment in bandwidth limited and power limited scenarios as well as reduction in earth station BUC HPA power requirements Carrier in Carrier is a Registered Trademark of Comtech EF Data DoubleTalk is a Trademark of Applied Signal Technology Inc VersaFEC is a Registered Trademark of Comtech AHA Corp VersaFEC Forward Error Correction CDM 625 EN offers VersaFEC a patented covered by U S patents 7 353 444 and 7 415 659 other patents pending system of high performance short block low latency LDPC codes designed to support latency sensitive applications such as cellular backhaul over satellite VersaFEC provides excellent c
3. 2 5 Mbps 5 Mbps or Acquisition Range Programmable in 1kHz increments 16 Mbps Below 64 ksymbols sec 1 kHz to Rs 2 kHz where Rs symbol FAST VersaFEC Codec symbol rate ACM 300 ksps 1 2 rate in ksymbols sec Msps or 4 1 Msps Between 64 and 1 kHz to 32 kHz FAST Open network IBS with high rate IBS ESC IDR and 389 ksymbols sec audio Above 389 1 kHz to 0 1 Rs kHz up to a FAST D amp I D amp l for single Port T1 E1 ksymbols sec maximum of 200 kHz FAST D amp l For Quad E1 Port 2 3 and 4 Acquisition Time Highly dependent on data rate FEC rate FAST Quality of Service and demodulator acquisition range E g 120 ms average at 64 kbps R1 2 QPSK 10 i ei Ca oer kHz acquisition sweep range 6 dB Eb No Plesiochronous Selectable from 64 to 262 144 bits in 16 bit Accessories Doppler Buffer steps Additional limitations for G 704 frame CRS 170A 1 1 Modem Redundancy Switch L Band boundaries CRS 180 1 1 Modem Redundancy Switch 70 140 MHz Receive Clock RX satellite TX terrestrial external CRS 280 1 10 IF Redundancy Switch 70 140 MHz l reference CRS 280L 1 10 IF Redundancy Switch L Band Clock Tracking 100 ppm minimum LNB Reference 10 MHz Via RX IF center conductor 10 0 MHz 0 06 Environmental And Physical ppm with internal reference selectable Temperature Operating 0 to 50 C 32 to 122 F on off 3 0 dBm 3 dB Storage 25 to 85 C 13 to 185 F LNB Voltage Selectable on off 13 VDC 18 VDC per Powe
4. C Drop amp insert D amp I Enhanced D amp l Quad E1 drop amp insert QDI DoubleTalk Carrier in Carrier optional plug in module FEC Options None Uncoded BPSK QPSK OQPSK Viterbi k 7 per Rate 1 2 BPSK QPSK OQPSK IESS 308 309 Rate 3 4 QPSK OQPSK Rate 7 8 QPSK OQPSK Viterbi with Reed Rate 3 4 16 QAM Solomon Rate 7 8 16 QAM Sequential See CDM 625 user manual for details Reed Solomon Open network and closed network modes TCM Per IESS 310 8 PSK TCM Rate 2 3 Integrated LDPC LDPC Code Rates and TPC 2 Gen Rate 1 2 BPSK QPSK OQPSK Codec Optional Rate 2 3 QPSK OQPSK 8 PSK 8 QAM Plug in Module Rate 3 4 QPSK OQPSK 8 PSK 8 QAM 16 QAM TPC Code Rates Rate 5 16 BPSK Rate 21 44 BPSK QPSK OQPSK Rate 3 4 QPSK OQPSK 8 PSK 8 QAM 16 QAM Rate 7 8 QPSK OQPSK 8 PSK 8 QAM 16 QAM Rate 0 95 QPSK OQPSK 8 PSK 8 QAM VersaFEC Codec BPSK Rate 0 488 Optional Plug in QPSK Rate 0 533 0 631 0 706 0 803 Module 8 QAM Rate 0 642 0 711 0 780 16 QAM Rate 0 731 0 780 0 829 0 853 IDR Mode no RS per ITU V 35 Intelsat variant IBS mode no RS per IESS 309 externally frame synchronized Transparent closed network mode no RS or TPC LDPC per ITU V 35 Intelsat variant EDMAC mode no RS coding externally frame synchronized proprietary TPC LDPC modes externally frame synchronized proprietary All RS modes externally frame synchronized per IESS 308 309 310 10 100Base T Ethernet with SNMP HTTP and Telnet support E
5. CDM 625 EN Advanced Satellite Modem with DoubleTalk Carrier in Carrier Overview The CDM 625 EN Advanced Satellite Modem builds on Comtech EF Data s legacy of providing the most efficient satellite modems for IP centric applications that require data encryption It is the first modem to combine advanced Forward Error Correction FEC such as VersaFEC and Low Density Parity Check LDPC codes with the revolutionary DoubleTalk Carrier in Carrier bandwidth compression allowing for maximum savings under all conditions This combination of advanced technologies enables multi dimensional optimization allowing satellite communications users to e Minimize operating expenses OPEX Maximize throughput without using additional transponder resources Maximize availability margin without using additional transponder resources Minimize capital expenses CAPEX by allowing a smaller BUC HPA and or antenna Or a combination to meet specific business needs The advanced technologies and features of CDM 625 EN are covered by a number of U S patents including 7 254 188 7 353 444 7 415 659 and other pending patents Features e DoubleTalk Carrier in Carrier bandwidth compression e Adaptive Coding and Modulation ACM e IP Packet Processor with header compression payload compression and advanced Quality of Service QoS e AES Data Encryption for IP traffic IP Packet Processor e Dual Band Capability 70 140 MHz and L Band in s
6. IA 232 EIA 485 2 or 4 wire Hardware fault RX and TX traffic alarms open network backward alarms External Reference BNC connector Input OR Output Input 1 2 5 or 10 MHz 6 dBm to 10 dBm 50 2 75 Q nominal Output 10 MHz 2 7 V peak to peak 0 4 V low impedance output Scrambling Management Form C Relays Data Interfaces ElA 422 530 DCE Up to 14 Mbps V 35 DCE Up to 14 Mbps LVDS Serial Up to 25 Mbps HSSI Serial Up to 25 Mbps G 703 T1 1 544 Mbps 9 pin D sub female Balanced 100 Q or 25 pin D sub female 25 pin D sub female G 703 T2 6 312 Mbps Unbalanced 75 Q or balanced 110 Q G 703 E1 2 048 Mbps Unbalanced 75 Q or balanced 120 Q G 703 E2 8 448 Mbps Unbalanced 75 Q ASI Up to 25 Mbps Additional 2 048 Mbps E1 Ports for Quad E1 Balanced 120 Q Overhead Data Modem Alarms 4 port 10 100Base T Managed Ethernet Switch Modulator Frequency Stability BNC female BNC female 9 pin D sub female 44 pin High density D sub male 15 pin D sub male 4 x RJ 45 0 06 ppm 6 x 10 0 to 50 C 32 to 122 F with internal reference Transmit Filtering Per IESS 308 Transmit Filter Rolloff 25 35 Harmonics and Better than 60 dBc 4 kHz Spurious typically lt 65 dBc 4kHz Measured from 1 to 500 MHz 50 180 MHz band Measured Fo 500 MHz 950 2000 MHz band Transmit On Off Ratio 60 dBc minimum Output Phase Noise lt 0 480 rms double sided 100 Hz
7. ame unit e Data Rate 18 kbps to 25 Mbps e Symbol Rate 18 ksps to 12 5 Msps e Modulation BPSK QPSK OQPSK 8 PSK 8 QAM 16 QAM e FEC Viterbi Sequential Concatenated Reed Solomon TCM Turbo Product Code TPC IESS 315 Compliant LDPC Code and VersaFEC low latency LDPC e Widest Range of Data Interfaces 4 port 10 100Base T Ethernet EIA 422 530 V 35 G 703 T1 G 703 E1 G 703 T2 G 703 E2 Quad G 703 E1 ASI LVDS HSSI gt om EF DATA MSHI e 4 port Managed Ethernet Switch with VLAN and Qos e Sub Mux to multiplex IP Ethernet traffic with serial or G 7083 traffic e Drop amp Insert for T1 E1 e Enhanced D amp l for Single T1 E1 amp Quad E1 e Management 10 100Base T Ethernet with SNMP Distant End SNMP Proxy HTTP Telnet and EIA 232 ElIA 485 e Embedded Distant end Monitor and Control EDMAC e Automatic Uplink Power Control AUPC e Standard High Stability Internal Reference 6 x 10 e 5 tap Adaptive Equalizer e L Band TX 10 MHz reference for BUC FSK communications and optional BUC power supply e L Band RX 10 MHz reference and LNB power supply e Redundancy switches available Satellite Modems Typical Users Mobile Operators Telecom Operators Satellite Service Providers Government amp Military Enterprise Offshore Common Applications Cellular Backhaul G 703 Trunking IP Trunking Offshore amp Maritime Communications Enterprise Communications on the Move
8. he distant end of a satellite link using a proprietary overhead channel EDMAC S is also used for SNMP management of the distant end modem AUPC enables automatic uplink power control for a duplex link Management amp SNMP Proxy The modem can be managed via the front panel the remote M amp C port EIA 232 EIA 485 or the 10 100Base T Ethernet port With support for SNMP HTTP and Telnet the modem can be easily integrated into an IP based management system The CDM 625 EN can also act as SNMP proxy for the distant end modem This allows distant end modem management using SNMP without requiring an end to end IP link Feature Enhancements Enhancing the capability of the CDM 625 EN in the field is easy Features that do not require additional hardware can be added on site using FAST access codes purchased from Comtech EF Data Specifications Data Rate 18 kbps to 25 Mbps in 1 bps steps modulation FEC amp data interface dependant Symbol Rate 18 ksps to 12 5 Msps Operating 50 180 MHz standard and Frequency 950 2000 MHz Option 100 Hz resolution independent TX and RX operation Major Operating Open network per IESS 308 309 310 314 Modes transparent closed network per IESS 315 See User Manual LDPC TPC Codec optional plug in module For Details VersaFEC Codec optional plug in module with ACM or Constant Coding amp Modulation CCM EDMAC Framed with without AUPC RS Outer Codec High rate ESC Enhanced ESC ES
9. ia M amp C control BUC Power Supply HW Option Demodulator supply AC or DC primary power supply Input Power Range 50 180 MHz 105 10 log symbol rate to Hardware Integrated TPC 2 generation and LDPC Codec Desired Carrier 70 10 log symbol rate dBm module 950 2000 MHz 130 10 log symbol rate Hardware DoubleTalk Carrier in Carrier module to 80 10 log Symbol rate dBm Hardware VersaFEC Codec module Max Composite 50 180 MHz FAST L Band IF in addition to 70 140 MHz Operating Level 94 10 log symbol rate desired carrier FAST Modem data rate 10 Mbps 15 Mbps dBc 10 dBm max with the additional 20 Mbps or 25 Mbps requirement that within 10 MHz of the FAST 8 PSK and 8 QAM modulation 8 QAM requires desired carrier the composite power is lt TPC LDPC or VersaFEC Codec 30 dBc FAST 16 QAM modulation 950 2000 MHz l FAST TPC LDPC Codec data rate 10 Mbps 15 Mbps 20 102 10 log symbol rate desired carrier Mbps or 25 Mbps dBc 10 dBm max with the additional FAST DoubleTalk Carrier in Carrier license full 512 kbps requirement that within 10 MHz of the 1 1 Mbps 2 5 Mbps 5 Mbps desired carrier the composite power is lt 10 Mbps 15 Mbps 20 Mbps or 25 Mbps 30 dBc FAST DoubleTalk Carrier in Carrier license fractional 2 5 Absolute Maximum 20 dBm Mbps 5 Mbps 10 Mbps 15 Mbps 20 Mbps or 25 Mbps Adaptive Equalizer o tap design selectable on off FAST VersaFEC Codec data rate CCM
10. king at much lower Eb No compared to 8 PSK Dual Band Capability CDM 625 EN supports 70 140 MHz and L Band capability in the same unit with independently selectable transmit and receive IF This simplifies soaring and stocking in networks requiring 70 140 MHz and L Band units 4 Port Managed Ethernet Switch with VLAN amp QoS CDM 625 EN incorporates a 4 port 10 100Base T managed Ethernet switch with VLAN capability and priority based Quality of Service Access Native Mode and Trunk Mode are supported Traffic can be prioritized using port based priority or VLAN priority The maximum Ethernet frame size is 1536 bytes IP Packet Processor The IP Packet Processor enables efficient IP networking and transport over satellite by adding routing capability with very low overhead encapsulation header compression payload compression and Quality of Service to the CDM 625 The advanced QoS combined with header and payload compression ensures the highest quality of service with minimal jitter and latency for real time traffic priority treatment of mission critical applications and maximum bandwidth efficiency IP Packet processor also supports AES data encryption Header Compression The IP Packet Processor incorporates industry leading header compression for IP traffic Header compression can reduce the 40 byte IP UDP RTP header to as little as 1 byte For TCP IP the 40 byte header is reduced to as little as 3 bytes For applications such as VoIP heade
11. mation Rate CIR to each user defined class of traffic with the ability to allow a higher burstable rate depending on availability AES Data Encryption Configurable on a per route basis the modem supports AES data encryption for transmission security to prevent unauthorized access to data transmitted over the satellite link AES data encryption is only available for IP traffic processed by the IP Packet Processor Quad E1 Interface QDI with Enhanced D amp l The CDM 625 EN supports a Quad E1 interface that can aggregate up to four full or fractional E1s into a single carrier with very low overhead This provides significant CAPEX savings by reducing the number of modems and could possibly reduce the BUC HPA size by eliminating the multi carrier backoff A proprietary closed network drop amp insert D amp l allows for dropping or inserting any combination of 1 to 31 time slots on each E1 D amp l is supported for E1 CCS only For QDI operation all E1s must have a common clock source IP Sub Multiplexer The IP sub mux allows multiplexing IP Ethernet traffic with serial or G 703 traffic into a single carrier This is particularly useful for cellular backhaul when both E1 and IP backhaul is required This reduces the number of modems and could possibly reduce the BUC HPA size by eliminating the multi carrier backoff EDMAC amp AUPC The CDM 625 EN supports EDMAC EDMAC 2 EDMAC 3 and AUPC EDMAC EDMAC 2 EDMAC 3 can be used to monitor and control t
12. oding gain with lowest possible latency VersaFEC s Eb No performance is similar to that of DVB S2 short block or LDPC 16k block with 70 90 lower latency Compared to TPC VersaFEC can provide coding gain of 1 0 dB or more Adaptive Coding amp Modulation ACM Satellite users have traditionally relied on worst case link margin to overcome rain fade which leads to significant inefficiencies ACM converts the fade margin into increased throughput gain of 100 or more is possible The CDM 625 EN with VersaFEC was specifically architected to support ACM for IP Ethernet traffic ACM maximizes throughput under all conditions rain fade inclined orbit satellite operation antenna mis pointing noise interference and other impairments VersaFEC ACM can provide almost 85 reduction in latency compared to DVB S2 short block ACM can also be used with DoubleTalk Carrier in Carrier Low Density Parity Check Codes LDPC amp Turbo Product Codes TPC CDM 625 EN offers an integrated LDPC and 2 Generation TPC codec LDPC is an advanced Forward Error Correction technique capable of providing performance much closer to Shannon limit The current LDPC implementation can provide 0 7 to 1 2 dB additional coding gain compared to an equivalent TPC code In order to take full advantage of the increased coding gain provided by LDPC Comtech EF Data has developed a patented 8 QAM modulation U S patent 7 254 188 that allows for acquisition and trac
13. r Supply 100 240 VAC 6 10 50 60 Hz auto DiSEq 4 2 and 24 VDC at 500 mA maximum sensing Monitor Functions Ep No estimate corrected BER frequency 48 VDC HW option offset buffer fill state receive signal level Power 48 W typical with TPC LDPC Codec and Carrier n Consumption in Carrier module installed 55 W max DoubleTalk Carrier in Carrier 60 W typical with TPC LDPC Codec IP Packet Delay Range 0 to 330 ms Processor and Carrier in Carrier module installed Power Spectral Density BSPK QPSK 8 PSK 8 QAM 7 dB to 67 W max Ratio 11 dB 280 W typical with TPC LDPC Codec Carrier in Interferer to Desired 16 QAM 7 GB to 7 dB Carrier module and 48 VDC BUC power supply Maximum Symbol Rate 3 1 TX RX or RX TX installed 300 W max Ratio Dimensions 1RU 1 75 x 19 0 x 17 65 Eb No Degradation 0 dB Power Spectral Density Ratio height x width x 4 4 x 48 x 44 8 cm approximate BPSK QPSK O PSK 0 3 dB depth 8 QAM 0 4 dB Weight 10 8 Ibs 4 9 kg maximum with all option modules 8 PSK 0 5 dB and 48 VDC BUC power supply installed 16 QAM 0 6 dB CE Mark EN 55022 Class B EN 61000 4 4 10 dB power spectral density ratio Emissions EN 61000 4 5 Additional 0 3 dB EN 50082 1 Immunity EN 61000 4 6 Satellite Restrictions Satellite in loop back mode i e the EN 60950 Safety EN 61000 4 8 transmit station can receive itself EN 61000 4 9 Non processing satellite i e does not EN 61000 3 2 EN 61000 4 11 demod
14. r compression can provide bandwidth savings exceeding 60 E g the 8 kbps G 729 voice codec requires 24 kbps of IP bandwidth once encapsulated into an IP UDP RTP datagram With header compression the same voice call needs about 8 5 kbps a saving of almost 65 And bandwidth requirements for typical Web HTTP traffic can be reduced by 10 or more with TCP IP header compression Payload Compression The IP Packet Processor incorporates industry leading payload compression for IP traffic Implemented in the hardware for maximum throughput and efficiency payload compression can reduce the required satellite bandwidth by as much as 40 50 Streamline Encapsulation SLE The IP Packet Processor incorporates Comtech EF Data s patent pending very low overhead Streamline Encapsulation SLE SLE can reduce the encapsulation overhead by as much as 65 compared to industry standard HDLC Advanced Quality of Service QoS The IP Packet Processor incorporates multi level QoS to ensure the highest quality service with minimal jitter and latency for real time traffic priority treatment of mission critical applications and maximum bandwidth efficiency Supported modes are e DiffServ Industry standard method of providing QoS enabling seamless co existence in networks that implement DiffServ e Max Priority Provides multi level traffic prioritization with the ability to limit maximum traffic per priority class e Min Max Provides a Committed Infor
15. to 1 MHz Minimum 16 GB better overall than the Intelsat IESS 308 309 requirements dB Hz Frequency Offset 63 0 100 Hz 73 0 1 kHz 83 0 10 kHz 93 0 100 kHz Fundamental AC line spurious is 42 dBc or lower The sum of all other single sideband spurious from 0 to 0 75 x symbol rate is 48 dBc or lower 50 180 MHz 0 5 dB over frequency data rate modulation type and temperature range of 15 to 35 C 0 8 dB over frequency data rate modulation type and temperature range of 0 to 50 C 950 2000 MHz 0 7 dB over frequency data rate modulation type and temperature range of 15 to 35 C 1 0 dB over frequency data rate modulation type and temperature range of 0 to 50 C Output Impedance amp 50 180 MHz 50 2 75 Q 16 dB minimum return Return Loss loss 18 dB typical BNC connector 950 2000 MHz 50 Q 19 dB minimum return loss 21 dB typical Type N connector Internal 0 06 ppm SCT External locking over a 100 ppm range TT Loop timing RX satellite clock supports asymmetric operation External clock By TTL low signal or external contact closure Power Accuracy Clocking Options External TX Carrier Off BUC Reference Via TX IF center conductor 10 0 MHz 0 06 10 MHz ppm with internal reference selectable ON OFF 0 0 dBm 3 dB 24 VDC 4 17 Amps max 90 W 50 C 48 VDC 3 125 Amps max 150 W 50 C 180 W 30 C Supplied through TX IF center conductor and selectable on off v
16. ulate or remodulate the signal EN 61000 3 3 EN 61000 4 13 Available Options FCC aoe aoe B Hardware 100 240 VAC 175W AC primary power supply Hardware 48 VDC 125 W primary power supply Hardware 24 VDC 90 W 50 C BUC power supply AC or DC primary power supply Hardware 48 VDC 150 W 50 C 180 W 30 C BUC power 2114 West 7th Street Tempe Arizona 85281 USA e Voice 1 480 333 2200 e Fax 1 480 333 2540 e Email sales comtechefdata com Comtech EF Data reserves the right to change specifications of products described in this document at any time without notice and without obligation to notify any person of such changes Information in this document may differ from that published in other Comtech EF Data documents Refer to the website or contact Customer Service for the latest released product information 2010 Comtech EF Data ds cdm625 EN DOCX 11 09 2010
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