Modems CDM-625 Advanced Satellite Modem with DoubleTalk
Contents
1. Between 64 and 1 kHz to 32 kHz 389 ksymbols sec Above 389 ksymbols sec 1 kHz to 0 1 Rs kHz up toa maximum of 200 kHz Acquisition Time Highly dependent on data rate FEC rate and demodulator acquisition range E g 120 ms average at 64 kbps R1 2 QPSK 10 kHz acquisition sweep range 6 dB Eb No Plesiochronous Selectable from 64 to 262 144 bits in 16 bit Doppler Buffer steps Additional limitations for G 704 frame boundaries Receive Clock RX satellite TX terrestrial external reference Clock Tracking 100 ppm minimum LNB Reference 10 MHz Via RX IF center conductor 10 0 MHz 0 06 ppm with internal reference selectable on off 3 0 dBm 3 dB LNB Voltage Selectable on off 13 VDC 18 VDC per DiSEq 4 2 and 24 VDC at 500 mA maximum Monitor Functions E No estimate corrected BER frequency offset buffer fill state receive signal level DoubleTalk Carrier in Carrier Delay Range 0 to 330 ms Power Spectral Density BSPK QPSK 8 PSK 8 QAM 7 dB to Ratio 11 dB Interferer to Desired 16 QAM 7 dB to 7 dB Maximum Symbol Rate 3 1 TX RX or RX TX Ratio Eb No Degradation 0 dB Power Spectral Density Ratio BPSK QPSK OQPSK 0 3 dB 8 QAM 0 4 dB 8 PSK 0 5 dB 16 QAM 0 6 dB 10 dB power spectral density ratio Additional 0 3 dB Satellite Restrictions Satellite in loop back mode i e the transmit station can receive itself Non processing satellite i e does not demod2. 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 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 Advanced FSK for LPOD Monitoring amp Control The Advanced FSK allows for monitoring and control of LPOD through modem front panel menus serial remote control and Telnet CDM 600 CDM 600L Emulation Mode CDM 625 can be placed in CDM 600 or CDM 600L emulation mode This permits easy integration into an existing CDM 600 L setup without changes to M amp C platform or redundancy switches Feature Enhancements Enhancing the capability of the CDM 625 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 Symbol Rate Operating Frequency Major Operating Modes See User Manual For Details FEC Options None Viterbi k 7 per IESS 308 309 Viterbi with Reed Solomon Sequential Reed Solomon TCM Per IESS 310 Integrated LDPC and TPC 2 Gen Codec Optional Plug in Module VersaFEC Codec Optional Plug in Module Scrambling
3. Management Form C Relays External Reference Input OR Output 18 kbps to 25 Mbps in 1 bps steps modulation FEC amp data interface dependant 18 ksps to 12 5 Msps 50 180 MHz standard and 950 2000 MHz Option 100 Hz resolution independent TX and RX operation Open network per IESS 308 309 310 314 transparent closed network per IESS 315 LDPC TPC Codec optional plug in module 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 ESC Drop amp insert D amp I Enhanced D amp l Quad E1 drop amp insert QDI DoubleTalk Carrier in Carrier optional plug in module Uncoded BPSK QPSK OQPSK Rate 1 2 BPSK QPSK OQPSK Rate 3 4 QPSK OQPSK Rate 7 8 QPSK OQPSK Rate 3 4 16 QAM Rate 7 8 16 QAM See CDM 625 user manual for details Open network and closed network modes 8 PSK TCM Rate 2 3 LDPC Code Rates Rate 1 2 BPSK QPSK OQPSK Rate 2 3 QPSK OQPSK 8 PSK 8 QAM 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 BPSK Rate 0 488 QPSK Rate 0 533 0 631 0 706 0 803 8 QAM Rate 0 576 ECCM 0 642 0 711 0 780 16 QAM Rate 0 644 ECCM 0 731 0 780 0 829 0 853 BPSK 0 493 ULL QPSK 0 493 0 654 0 734 ULL IDR Mod
4. loss 21 dB typical Type N connector Clocking Options Internal 0 06 ppm SCT External locking over a 100 ppm range TT Loop timing RX satellite clock supports asymmetric operation External clock External TX Carrier By TTL low signal or external contact closure Off BUC Reference Via TX IF center conductor 10 0 MHz 10 MHz 0 06 ppm with internal reference selectable ON OFF 0 0 dBm 3 dB BUC Power Supply 24 VDC 4 17 Amps max 90 W 50 C HW Option 48 VDC 3 125 Amps max 150 W 50 C 180 W 30 C Supplied through TX IF center conductor and selectable on off via M amp C control Demodulator Input Power Range 50 180 MHz 105 10 log symbol rate to Desired Carrier 70 10 log symbol rate dBm 950 2000 MHz 130 10 log symbol rate to 80 10 log symbol rate dBm Max Composite 50 180 MHz Operating Level 94 10 log symbol rate desired carrier dBc 10 dBm max with the additional requirement that within 10 MHz of the desired carrier the composite power is lt 30 dBc 950 2000 MHz 102 10 log symbol rate desired carrier dBc 10 dBm max with the additional requirement that within 10 MHz of the desired carrier the composite power is lt 30 dBc Absolute Maximum 20 dBm Adaptive Equalizer 5 tap design selectable on off Acquisition Range Programmable in 1kHz increments Below 64 ksymbols sec 1 kHz to Rs 2 kHz where Rs symbol rate in ksymbols sec
5. Provides a Committed Information Rate CIR to each user defined class of traffic with the ability to allow a higher burstable rate depending on availability Quad E1 Interface QDI with Enhanced D amp l The CDM 625 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 The IP sub mux ratio ranges from 9 1 IP data rate is 9 times that of the serial or G 703 data rate to as low as 1 59 EDMAC amp AUPC The CDM 625 supports EDMAC EDMAC 2 EDMAC 3 and AUPC EDMAC EDMAC 2 EDMAC 3 can be used to monitor and control the distant end of a satellite link using a proprietary overhead channel EDMAC 3 is also used for SNMP management of the distant end modem
6. processor Accessories CRS 170A 1 1 Modem Redundancy Switch L Band CRS 180 1 1 Modem Redundancy Switch 70 140 MHz CRS 300 1 10 Modem Redundancy Switch Not available with IP Packet Processor CRS 280 1 10 IF Redundancy Switch 70 140 MHz CRS 280L 1 10 IF Redundancy Switch L Band CRS 500 1 N Modem Redundancy System For use with IP Packet Processor Only CRS 282XXX 1 10 IF Redundancy Switch For use with CRS 500 Environmental And Physical Temperature Power Supply Operating 0 to 50 C 32 to 122 F Storage 25 to 85 C 13 to 185 F 100 240 VAC 6 10 50 60 Hz auto sensing 48 VDC HW option Power Consumption 48 W typical with TPC LDPC Codec and Carrier in Carrier module installed 55 W max 60 W typical with TPC LDPC Codec IP Packet Processor and Carrier in Carrier module installed 67 W max 280 W typical with TPC LDPC Codec Carrier in Carrier module and 48 VDC BUC power supply installed 300 W max Dimensions 1RU height x width x depth 1 75 x 19 0 x 17 65 4 4 x 48 x 44 8 cm approximate Weight CE Mark 10 8 Ibs 4 9 kg maximum with all option modules and 48 VDC BUC power supply installed EN 55022 Class B EN 61000 4 4 Emissions EN 61000 4 5 EN 50082 1 Immunity EN 61000 4 6 EN 60950 Safety EN 61000 4 8 EN 61000 3 2 EN 61000 4 9 EN 61000 3 3 EN 61000 4 1 1 EN 61000 4 2 EN 61000 4 13 FCC Part 15 Clas
7. CDM 625 Advanced Satellite Modem with DoubleTalk Carrier in Carrier Overview Typical Users The CDM 625 Advanced Satellite Modem builds on Comtech EF Data s legacy of providing the most e Mobile Operators efficient satellite modems 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 e Maximize throughput without using additional transponder resources e Maximize availability margin without using additional transponder resources e Minimize capital expenses CAPEX by allowing a smaller BUC HPA and or antenna e Or a combination to meet specific business needs Telecom Operators Satellite Service Providers e Government amp Military e Enterprise Features e DoubleTalk Carrier in Carrier bandwidth e Drop amp insert for T1 E1 Offshore compression e Enhanced D amp l for single T1 E1 amp quad E1 e Adaptive Coding and Modulation ACM e Management 10 100Base T Ethernet with Common Applications e IP Packet Processor with header compression SNMP Distant End SNMP Proxy HTTP Telnet Sy Backhaul payload compression and advanced Quality of and E
8. IA 232 EIA 485 Service QoS e Embedded Distant end Monitor and Control G 703 Trunking e Dual Band Capability 70 140 MHz and L Band in EDMAC same unit e Automatic Uplink Power Control AUPC IR Tanin e Data Rate 18 kbps to 25 Mbps e Engineering Service Channel ESC ESC g e Symbol Rate 18 ksps to 12 5 Msps Standard high stability internal reference lt Offshore amp Maritime e Modulation BPSK QPSK OQPSK 8 PSK 8 6x 10 Be era ee QAM 16 QAM e 5 tap Adaptive Equalizer e FEC Viterbi Sequential Concatenated Reed e L Band TX 10 MHz reference for BUC FSK Enierorise Solomon TCM Turbo Product Code TPC communications and optional BUC power supply IESS 315 Compliant LDPC Code and e L Band Advanced FSK for LPOD M amp C iG Sian Conon VersaFEC low latency LDPC L Band RX 10 MHz reference and LNB power Widest Range of data interfaces EIA 422 530 supply the Move V 35 G 703 T1 G 703 E1 G 703 T2 G 703 E2 e Open network modes GA ATA News Quad G 703 E1 ASI LVDS HSSI 4 port e CDM 600 L emulation mode Gathering 10 100Base T Ethernet e 1 1 and 1 10 redundancy switches available e 4 port managed Ethernet switch with VLAN and e Backwards compatible with CDM 500 CDM 550 QoS CDM 550T CDM 570 L and CDM 600 L e Sub Mux to multiplex IP Ethernet traffic with serial Satellite Modems or G 703 traffic e Interoperable with many Comtech EF Data Satellite Modems CDM Qx L SDM 8000 300A and 300L3 Doubletalk Carrier In Carrie
9. cellent coding 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 The new Ultra Low Latency ULL codes provide even lower latency compared to standard VersaFEC codes 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 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 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 Da
10. e 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 Turbo coding per ITU V 35 Intelsat variant EDMAC mode no RS coding externally frame synchronized proprietary Turbo Product Code LDPC VersaFEC 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 EIA 232 EIA 485 2 or 4 wire Hardware fault RX and TX traffic alarms open network backward alarms BNC connector Input 1 2 5 or 10 MHz 6 dBm to 10 dBm 50 9 75 Q nominal Output 10 MHz 2 7 V peak to peak 0 4 V low impedance output Data Interfaces EIA 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 Balanced 100 Q 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 25 pin D sub female 25 pin D sub female 9 pin D sub female or BNC female G 703 E2 8 448 Mbps Unbalanced 750 ASI Up to 25 Mbps Additional 2 048 Mbps E1 Ports for Quad E1 Balanced 120 Q Overhead Data Modem Alarms BNC female 9 pin D sub female 44 pin High density D sub male 15 pin D sub male 4 port 10 100Base T Managed Ethernet Switch 4 x RJ 45 Optional IP Packet Proce
11. lications such as VoIP header 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
12. r DoubleTalk Carrier in Carrier is based on patented bandwidth compression technology originally developed by Applied Signal Technology Inc Using Adaptive Cancellation it allows transmit and receive carriers of a two way link to share the same transponder space G OMTECH www comtechefdata com EF DATA EFIII Figure 1 shows the typical full duplex satellite link wnere 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 R1 FRQ 78 888 MHz RL 45 00 dBm j ATTEN 10 dB 53 48 dBm ATTEN 18 dB Composite 5 88 dB D1Y 5 88 dB OIU DOD CT T AANA belili Carrier 1 CENTER PRRAHEHO ma pote NORD pian patina VIDEO BANDWIDTH DENCE 8 SYS MHz a paa zx 108 Hz H ka j f H t 4 A 4 f t A i i 4 l i i 1 i t 4 4 1 f f peijooni l j f i s fy I4 Carrier 1 ae Carrier 2 Carrier 2 t nak amp i j A l i i p i one i ve o A i i l LN CENTER 70 505 MHz SPAN 2 000 MHz CENTER 70 000 MHz SPAN 2 000 MHz RB 21 5 kHz VB 30 8 Hz gt T 9 382 se RB 21 5 kHz VB 108 Hz 3i e 739i sec Figure 1 Figure 2 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 Carrie
13. r is complementary to all advances in modem technology including 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 is the first modem to offer VersaFEC a patented system of high performance short block low latency LDPC codes designed to support latency sensitive applications such as cellular backhaul over satellite VersaFEC provides ex
14. s B CDM 625 Rear Panel
15. ssor Available Modulator Frequency Stability Transmit Filtering Transmit Filter Rolloff Harmonics and Spurious Transmit On Off Ratio Output Phase Noise Output Power Power Accuracy 0 06 ppm 6 x 10 0 to 50 C 32 to 122 F with internal reference Per IESS 308 25 35 Better than 60 dBc 4 kHz typically lt 65 dBc 4kHz Measured from 1 to 500 MHz 50 180 MHz band Measured Fo 500 MHz 950 2000 MHz band 60 dBc minimum lt 0 480 rms double sided 100 Hz to 1 MHz Minimum 16 dB 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 to 25 dBm 0 1 dB steps 950 2000 MHz 0 to 40 dBm 0 1 dB steps 90 180 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 9 75 Q 16 dB minimum return Return Loss loss 18 dB typical BNC connector 950 2000 MHz 50 19 dB minimum return
16. ta has developed a patented 8 QAM modulation that allows for acquisition and tracking at much lower Eb No compared to 8 PSK Dual Band Capability CDM 625 supports 70 140 MHz and L Band capability in the same unit with independently selectable transmit and receive IF This simplifies sparing and stocking in networks requiring 70 140 MHz and L Band units 4 Port Managed Ethernet Switch with VLAN amp QoS CDM 625 base modem 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 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 app
17. ulate or remodulate the signal Available Options Hardware 100 240 VAC 175 W 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 supply AC or DC primary power supply Hardware Integrated TPC 2 generation and LDPC Codec module Hardware DoubleTalk Carrier in Carrier module Hardware VersaFEC Codec module Hardware IP Packet Processor FAST L Band IF in addition to 70 140 MHz FAST Modem data rate 10 Mbps 15 Mbps 20 Mbps or 25 Mbps FAST 8 PSK and 8 QAM modulation 8 QAM requires TPC LDPC or VersaFEC Codec FAST 16 QAM modulation FAST TPC LDPC Codec data rate 10 Mbps 15 Mbps 20 Mbps or 25 Mbps FAST DoubleTalk Carrier in Carrier license full 512 kbps 1 1 Mbps 2 5 Mbps 5 Mbps 10 Mbps 15 Mbps 20 Mbps or 25 Mbps FAST DoubleTalk Carrier in Carrier license fractional 2 5 Mbps 5 Mbps 10 Mbps 15 Mbps 20 Mbps or 25 Mbps FAST VersaFEC Codec data rate CCM 2 5 Mbps 5 Mbps or 16 Mbps FAST VersaFEC Codec symbol rate ACM 300 ksps 1 2 Msps or 4 1 Msps FAST Open network IBS with high rate IBS ESC IDR and audio FAST D amp I D amp Il for single Port T1 E1 FAST D amp l For Quad E1 Port 2 3 and 4 FAST Quality of Service requires IP Packet Processor FAST Header Compression requires IP Packet Processor FAST Payload Compression requires IP packet
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