Datum Systems M7LT L-Band Satellite Modem

Datum Systems

Datum Systems M7LT L-Band Satellite Modem

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  • Highly Configurable Remote Terminal
  • Internal BUC and LNB Power Supply
  • High Stability 10 MHz Reference

SKU: DTM105 Tags: , , , , ,
  • Description
  • Technical Specifications
  • Support Documents

M7 Modular MODEM SERIES – M7LT L-Band Sat-Terminal – Modular Satellite Modems

Datum Systems innovation is transforming the SCPC and MCPC modem industry with a new generation modular modem product, the M7LT, that is versatile, compact, highly efficient and costs less to own and operate.

Advanced FlexLDPC Onboard – With unparalleled configuration flexibility and superior coding gain, FlexLDPC takes FEC technology innovation to the next level, bringing strong economic advantages to satellite service providers and their customers. Granular code rates and block sizes get you the most out of your available satellite bandwidth and spectral power, while keeping processing latency at the desired level.

Sharp Carrier Roll-Off Technology – The M7 Series supports advanced filter shaping for optimizied carrier spacing as a standard feature. Datum currently offers down to an 5% Alpha, which means that carriers can be spaced at 1.05 times the symbol rate instead of the historical factor of 1.35. This allows an immediate spectral efficiency increase and significant bandwidth savings, at no additional hardware or software cost. Filter Roll-Off options in the new M7 modems Series include 5%, 8%, 10%, 15%, 20%, 25%, 30%, 35% and 40%. See Advanced Filter Shaping White Paper for more information.

Smart Carrier Canceller – Smart Carrier is a patented advanced second generation carrier canceller which allows 2 similar carriers to occupy the same transponder spectrum, but is different from other cancellers in that it is a baseband canceller instead of an IF canceller. It allows excellent performance with easy setup and no additional cabling. Smart Carrier is compatible with all Datum modulation types and FECs, and is well suited to be used with Sharp Roll-Off factors all the way down to 5%. Datum’s technique provides improvement in the Shannon Capacity of ~ 2 dB, which is ~50 % increase in the fundamental channel capacity.

System Architectures Supported

  • Point-to-Point, Point-to-Multipoint,
  • Mesh, Unicast & Multicast

Key Highlights

  • Highly Configurable Remote Terminal
  • Internal BUC and LNB Power Supply
  • High Stability 10 MHz Reference
  • FlexLDPC Multi Block Sizes & Code Rates
  • 1.2 kbps to 59.4 Mbps, 1 bps steps
  • Widest Range of Carrier Roll-Off Factors
  • Dual G.703/E1 Full & Fractional (N x 64)
  • Advanced IP Interface
    • 200,000 Packets Per Second Throughput
    • Bridge and Router Modes
    • 3rd Party Platform for IP Optimization
  • Express Ethernet Interface
    • Layer 2 Bridge, Switch Based
    • 4-Port with additional SFP Port
    • QoS and VLAN Support
  • Lowest Latency, <15 ms at 64 kbps ¾ QPSK
  • Fast acquisition time
  • Multi-Flo Async Channel, AUPC
  • State-of-the-Art Web Browser GUI


  • Cellular Backhaul
  • Enterprise
  • IP Networks
  • E1 Trunking
  • On-the-Move
  • Bandwidth on Demand

Model M7LT Specifications
Operating Modes TX and RX Continuous (SCPC)
FlexLDPC, Flexible Block and Code Rates, Low Latency
Advanced TPC and Industry Compatible Std and Custom Async Low Overhead Channels, AUPC
Remote Modem Control Channel
IP, Ethernet, Dual G.703/E1 (D&I), Serial, HSSI
Opt Plug-in I/O Selections (Up to 2 per M7 Unit)
Data Rate Range 1.2 kbps to 59.04 Mbps, (1 bps steps)
Symbol Rate Range 2400 sps to 14.76 Msps (1 sps steps)
L-Band Tuning Range 950 to 2150 MHz (1 Hz steps)
FEC Options None, Viterbi, TCM, Reed-Solomon, FlexLDPC TPC 4k and TPC 16k (Opt Plug-in HW)
Advanced FlexLDPC Block Sizes 256,512,1k,2k,4k,8k,16k
Rates 1/2,2/3,3/4,14/17,7/8,10/11,16/17
Turbo Product Code TPC-4k 21/44, 1/2, 3/4, 7/8, 0.950
TPC-16k 1/2, 3/4, 7/8, 0.453, 0.922
Viterbi 1/2, 3/4, 7/8 (k=7), Trellis 2/3
Reed Solomon Selectable N & K, IESS 308/309/310
Scrambler/Descrambler IBS, V.35, IESS, TPC, RS, LDPC, EFD
Input Acquisition Range ±100 Hz to ±3 MHz, 1 Hz Steps
Minimum Input Level 10 Log(Symbol Rate) - 125 = Lvl (dBm)
Maximum Input Level 10 Log(Symbol Rate) - 80 = Lvl (dBm)
Maximum IF Input Power Density +20 dBc/Hz
Maximum Total Power +10 dBm
Receive Acquisition Time Typical 71 ms at 64 kbps, QPSK
Input Impedance 50 Ohms N-Type or 75 Ohms F-Type (factory option)
Input Return Loss L-Band > 16dB
Input Phase Noise > Intelsat by 6 dB typical, 4 dB min
Demod Roll-Off Factor % 5, 8, 10, 15, 20, 25, 30, 35, 40 (%)
Smart Carrier Cancelling
Delay Range 0 to 320 msec
Acquisition Time < 30 Sec for Full Delay Sweep
Power Spectral Density Ratio: +/- 10 dB:
Symbol Rate Ratio: +/- 30% of Symbol Rate
Frequency Offset: +/- 12.5% of Symbol Rate
Eb/No Degradation PSD Ratio 0 dB
8PSK/8QAM: 0.3 dB
16QAM: 0.5 dB
Interface Options: (Choose Up to Two Per Modem)
Serial Data Interface (S7)
Main Interface Modes Sync RS-232,449,V.35,EIA-530 (DB-25)
Internal Clock (ST) Accuracy ±1E-12, (±1 part per Trillion)
Doppler Buffer Depth 4 Bits to 524,284 Bits, 1 Bit Steps
ESC Overhead I/O Modes Async RS-232,RS-485 (DB-25)
Adv Mux ESC OH Data Rate Disabled, 300 bps to 3.5 Mbps, 1 bps Steps
Adv Mux (MCC) OH Data Rate Disabled, 300 to 29.52 Mbps, 1 bps Steps
ESC Remote Signaling I/O's Form C (Qty 2)
Advanced IP Interface (I7)
Adv Ethernet IP Interface 10/100 BaseT, Gigabit Ethernet (RJ-45)
Operating System Debian Linux Operating System
Operating Modes Bridge and Vyatta Router
Packets Per Second 70,000 PPS
Network Protocols: See Specification
Express Ethernet Interface (E7)
Express Ethernet Ports 4Ports (RJ-45), 1 Port SFP
4 Port Interface 10/100 BaseT, Gigabit Ethernet (RJ-45)
SFP Port Optional Gigabit or Optiuc Fiber
Ethernet Protocol Layer 2 Swtched Bridge Only
Features QoS and VLAN Selectable
Dual G.703/E1 Interface (G7)
G.703 E1 Physical Inputs Dual Bal Inputs on (RJ-48), UnBal Opt
Formats Supported Full E1, D&I / PCM-30 (CAS), PCM-31 (CCS)
D&I Time Slots Supported N x 64, N = 1 to 31 Time Slots
Monitor and Control
Remote Control Interfaces RS-232, RS-485, SNMP, Web Browser
Alarm Outputs Qty 2 Form C
Environment and Physical
AC or DC Input (factory option) 90-264 VAC, Optional 48 VDC (20-60 VDC)
High Stability Ref Option Internal 10 MHz at Nominal, -3 dBm
Reference Stability 1 x 10-8 OCXO, 2 x 10-7/year aging
BUC Power Options AC Input Models: (Max Current Rating Listed)
(1) 24 VDC@110 watts, 4.2A (2) 24 VDC@120 watts, 5.0A
DC Input Models:
(1) 48 VDC@100 watts, 2.1A (2) 48 VDC@150 watts 3.1A
(3) 48 VDC@200 watts 4.2A
LNB Output Power Selectable: Off, 13 or 18 VDC
Operating Temp Range 0 to 50°C, 99% humidity, non-cond
Storage Temperature -20 to +70°C, 99% humidity, non-cond
Size 19" (W) x 11" (D) x 1.75" (H)
Weight 10 lbs, fully configured
Certification and Compliance
CE Certified for: EN55022 Emmissions/EN55024 Immunity
ETSI EN301 489-1 V1.9.2 (Emissions/Immunity)
EN60950 (Safety)
RoHS Meets RoHS lead-free standards

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