Comtech CDM-625-EN
Contents
1. Unbalanced 75 or balanced 120 Q G 703 E2 8 448 Mbps 750 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 Transmit Filtering Transmit Filter Rolloff Harmonics and Spurious Transmit On Off Ratio Output Phase Noise Output Power Demodulator Input Power Range Desired Carrier 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 25 pin D sub female 25 pin D sub female 9 pin D sub female or BNC female Unbalanced 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 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 Fy 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 90 180 MHz 0 to 25 dB2. Carrier utilizing advanced signal processing techniques provides a new dimension in bandwidth efficiency Digis Modems Typical Users Mobile Operators Telecom Operators Satellite Service Providers Government amp Military Enterprise Offshore a Common Applications Mobile Backhaul G 703 Trunking IP Trunking Offshore amp Maritime Communications Enterprise Communications on the Move Satellite News Gathering Digisat International Inc 4195 W New Haven Ave Suite 15 Melbourne FL 32904 USA 1 321 676 5250 Email sales digisatorg http www digisat org 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 Rte 45 00 d amp m MKR R1 FRG 7B 088 MH2 RL 45 00 dBm i ATTEN 10 48 53 48 dBm ATTEN 10 dB Composite alee Dall BONA EDO IA ines Carrier 1 J hlina EN es a HEH penaa nan VIDEO BANDWIDTH EN sore un ales Ar MN B T HHz i Y 108 Hz wi va K 4 i j 4 i ry om iE a a 4 i f f i f j Carrier 1 Carrier2 J Carrier 2 4 j ri j L fi Ve a i 4 gt CENT i dk SUS MHz SPAN Ad HHz CENTER 000 MHz SPAN 2 800 MHz RE 5 VB 30 0 Hz gt T 9 382 sex RB 21 5 kHz JB 108
3. Hz ST 2 791 sec 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 As DoubleTalk Carrier in Carrier allows equivalent spectral efficiency using a lower order modulation and or code rate 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 Registered Trademark of Raytheon Applied Signal Technology VersaFEC is a Registered Trademark of Comtech EF Data Carrier in Carrier Automatic Power Control CnC APC The patent pending Carrier in Carrier Automatic Power Control CnC APC mechanism enables modems on both sides of a CnC link to automatically measure and compensate for rain loss while maintaining the Total Composite Power In addition to automatically compensating for
4. 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 Information Rate CIR to each user defined class of traffic with the ability to allow a higher burstable rate depending on availability Managed Switch Mode Managed switch modem enables layer 2 operation with the Packet Processor This provides significant bandwidth savings for layer 2 operation with very low overhead Streamline Encapsulation header compression and payload compression 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 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 droppi
5. rain loss CnC APC also enables the modems to share link margin i e a modem in clear sky conditions can effectively transfer excess link margin to a distant end modem experiencing fade thereby further enhancing overall availability VersaFEC Forward Error Correction CDM 625 EN offers 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 excellent 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 ACM maximizes throughput under all conditions rain fade inclined orbit satellite operation antenna mis pointing noise interference and other impairments 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 For
6. 5 Mbps FAST 8PSK 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 l for single Port T1 E1 FAST D amp l For Quad E1 Port 2 3 and 4 FAST Quality of Service FAST Header Compression FAST Payload Compression Accessories CRS 170A 1 1 Modem Redundancy Switch L Band CRS 180 1 1 Modem Redundancy Switch 70 140 MHz 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 Packet Processor Only CRS 282XXX 1 10 IF Redundancy Switch For use with CRS 500 Environmental And Physical Temperature Operating 0 to 50 C 32 to 122 F Storage 25 to 85 C 13 to 185 F Power Supply 100 240 VAC 6 10 50 60 Hz auto sensing 48 VDC HW option Power 48 W typical with TPC LDPC Codec and Carrier Consumption in Carrier module installed 55 W max Dimensions 1RU height x width
7. 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 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 Features e DoubleTalk Carrier in Carrier bandwidth e 4 port Managed Ethernet Switch with VLAN and compression Qos e Carrier in Carrier Automatic Power Control e Sub Mux to multiplex IP Ethernet traffic with serial or G 703 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 e Adaptive Coding and Modulation ACM Packet Processor with header co
8. ations and maximum bandwidth efficiency Packet processor also supports AES data encryption Header Compression The 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 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 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 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 Packet Processor incorporates multi level QoS to ensure the highest quality service with minimal jitter and latency for real time traffic priority treatment
9. ce 100 ppm minimum Via RX IF center conductor 10 0 MHz 0 06 ppm with internal reference selectable on off 3 0 dBm 3 dB Selectable on off 13 VDC 18 VDC per DiSEq 4 2 and 24 VDC at 500 mA maximum E No estimate corrected BER frequency offset buffer fill state receive signal level DoubleTalk Carrier in Carrier Delay Range Power Spectral Density Ratio Interferer to Desired Maximum Symbol Rate Ratio Eb No Degradation Satellite Restrictions 0 to 330 ms BSPK QPSK 8PSK 8 QAM 7 dB to 11 dB 16 QAM 7 dB to 7 dB 3 1 TX RX or RX TX 0 dB Power Spectral Density Ratio BPSK QPSK OQPSK 0 3 dB 8 QAM 0 4 dB 8PSK 0 5 dB 16 QAM 0 6 dB 10 dB power spectral density ratio Additional 0 3 dB Satellite in loop back mode i e the transmit station can receive itself Non processing satellite i e does not demodulate or remodulate the signal Available Options Hardware Hardware Hardware Hardware 100 240 VAC 175 W AC primary power supply 48 VDC 125 W primary power supply 24 VDC 90 W 50 C BUC power supply AC or DC primary power supply 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 FAST L Band IF in addition to 70 140 MHz FAST Modem data rate 10 Mbps 15 Mbps 20 Mbps or 2
10. m 0 1 dB steps 950 2000 MHz 0 to 40 dBm 0 1 dB steps 50 180 MHz 105 10 log symbol rate to 70 10 log symbol rate dBm 950 2000 MHz 130 10 log symbol rate to 80 10 log symbol rate dBm Max Composite Operating Level Absolute Maximum Adaptive Equalizer Acquisition Range Below 64 ksymbols sec Between 64 and 90 180 MHz 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 20 dBm 5 tap design selectable on off Programmable in 1kHz increments 1 kHz to Rs 2 kHz where Rs symbol rate in ksymbols sec 1 kHz to 32 kHz 389 ksymbols sec Above 389 ksymbols sec Acquisition Time Plesiochronous Doppler Buffer Receive Clock Clock Tracking LNB Reference 10 MHz LNB Voltage Monitor Functions 1 kHz to 0 1 Rs kHz up toa maximum of 200 kHz 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 Selectable from 64 to 262 144 bits in 16 bit steps Additional limitations for G 704 frame boundaries RX satellite TX terrestrial external referen
11. mpression payload compression advanced Quality of Service QoS and Managed Switch Mode e AES Data Encryption for IP traffic Packet e Dual Band Capability 70 140 MHz and L Band in Embedded Distant end Monitor and Control same unit EDMAC Automatic Uplink Power Control AUPC e Standard high stability internal reference 6 x 10 5 tap Adaptive Equalizer L Band TX 10 MHz reference for BUC FSK communications and optional BUC power supply e L Band Advanced FSK for LPOD M amp C e L Band RX 10 MHz reference and LNB power supply Redundancy switches available Data Rate 18 kbps to 25 Mbps e Symbol Rate 18 ksps to 12 5 Msps e Modulation BPSK QPSK OQPSK 8PSK 8 QAM 16 QAM FEC Viterbi Sequential Concatenated Reed Solomon TCM Turbo Product Code TPC IESS 315 Compliant LDPC Code and VersaFEC low latency LDPC 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 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 DoubleTalk Carrier in Carrier 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
12. ng or inserting any combination of 1 to 31 time slots on each E1 D amp l is supported for E1 CCS only 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 EN 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 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 Advanced FSK for LPOD Monitoring amp Control The Advanced FSK allows for monitoring and control of LPOD through modem front panel menus serial rem
13. ote control and Telnet 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 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 Management Form C Relays 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 man
14. ual for details Open network and closed network modes 8PSK TCM Rate 2 3 LDPC Code Rates Rate 1 2 BPSK QPSK OQPSK Rate 2 3 QPSK OQPSK 8PSK 8 QAM Rate 3 4 QPSK OQPSK 8PSK 8 QAM 16 QAM TPC Code Rates Rate 5 16 BPSK Rate 21 44 BPSK QPSK OQPSK Rate 3 4 QPSK OQPSK 8PSK 8 QAM 16 QAM Rate 7 8 QPSK OQPSK 8PSK 8 QAM 16 QAM Rate 0 95 QPSK OQPSK 8PSK 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 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 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 External Reference Input OR 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 G 703 T2 6 312 Mbps Unbalanced 75 Q or balanced 110 Q G 703 E1 2 048 Mbps
15. ward 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 that allows for acquisition and tracking at much lower Eb No compared to 8PSK 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 sparing 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 with Rev 2 HW is 2048 bytes Packet Processor The 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 applic
16. x depth Weight CE Mark FCC 60 W typical with TPC LDPC Codec 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 1 75 x 19 0 x 17 65 4 4 x 48 x 44 8 cm approximate 10 8 Ibs 4 9 kg maximum with all option modules and 48 VDC BUC power supply installed EN 301 489 1 ERM EN55022 Emissions EN55024 Immunity EN 61000 3 2 EN 61000 3 3 EN60950 Safety FCC Part 15 Subpart B
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