Comtech EF Data CDM-570L/IP L-Band Satellite Modem

Comtech EF Data CDM-570L/IP L-Band Satellite Modem

L-Band Modems

CDM-570/L FEATURES Data rate range from 2.4 kbps to 9.98 Mbps CDM-570 & CDM-570-IP: 50 to 90 or 100 to 180 MHz IF rangeCDM-570L & CDM-570L-IP: 950 to 2000 MHz IF range Modulation types: BPSK, QPSK, OQPSK, 8-PSK, Patented 8-QAM...

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  • Data rate range from 2.4 kbps to 9.98 Mbps
  • CDM-570 & CDM-570-IP: 50 to 90 or 100 to 180 MHz IF range
    CDM-570L & CDM-570L-IP: 950 to 2000 MHz IF range
  • Modulation types: BPSK, QPSK, OQPSK, 8-PSK, Patented 8-QAM (U.S. patent 7,254,188), 16-QAM
  • Forward Error Correction (FEC) choices include Turbo Product Code (TPC), Viterbi, Reed- Solomon, and Trellis Coded Modulation (TCM)
  • Data Interfaces: EIA-422/530, V.35, G.703 T1/E1 (option), 10/100Base-T Ethernet (option)
  • Standards based management via SNMP, Web, or Telnet
  • Symmetric as well as asymmetric operation for maximum bandwidth efficiency
  • Support for mesh, star and hybrid network topologies
  • E1 RAN Optimization (option)
  • G.703 clock extension for IP backhaul (option)
  • Fast acquisition demodulator (± 32 kHz acquisition range, 64 kbps, Rate 1/2 QPSK: 150 ms average)
  • Automatic Uplink Power Control (AUPC)
  • Embedded Distant-end Monitor and Control (EDMAC/EDMAC2)
  • Redundancy options
  • CDM-570 & CDM-570-IP: FSK communications to CSAT-5060 or KST-2000A
  • CDM-570L & CDM-570L-IP: 10 MHz reference for BUC, FSK communications and optional BUC power supply
  • CDM-570L & CDM-570L-IP: 10 MHz reference and power supply for LNB
  • Optional, integrated IP Module with 10/100Base-T Ethernet port (CDM-570-IP and CDM-570L-IP)
    • Static IP routing for unicast and multicast
    • Header and payload compression for maximum efficiency
    • IGMP v1 and v2
    • VLAN capability with 802.1Q compliant QoS
    • Vipersat Management System (VMS) integration


The CDM-570 and the CDM-570L are Comtech EF Data’s entry-level satellite modems that provide industry leading performance and flexibility in a 1 RU package at a very competitive price. Designed to address the market for low-cost terminals, the modems are available with 70/140 MHz or L-Band IF and EIA-530/-422, V.35, EIA-232 and G.703 data interfaces. An optional Internet Protocol (IP) Module with 10/100Base-T Ethernet port is available for IP-centric applications. For cellular backhaul, the CDM-570/L and CDM-570/LIP also offer E1 RAN Optimization as an option.


The optional Turbo Product Codec delivers significant performance improvement when compared to Viterbi with concatenated Reed-Solomon. It offers increased coding gain, lower decoding delay, and significant bandwidth savings compared to traditional FEC.


The CDM-570/L-IP has the ability to monitor and control the distant end of a point-to-point satellite link using EDMAC or EDMAC2. User data is framed and bits are added to pass control, status, and AUPC information. This is transparent to the user.


The FAST codes make it easy to upgrade the modem capability in the field. New features can be added on site, using FAST access codes purchased from Comtech EF Data that can be entered via the front panel.


The modems support SNMP, web-based and command line interfaces for management. The modems can also be configured and monitored from the front panel, or through the remote M&C port (for non-IP mode of operation). Ten complete RF configurations may be stored in the modem. An event log stores alarm and status information in non-volatile RAM, while the link statistics log stores link performance (Eb/No and AUPC performance) for monitoring and reporting purposes.


Comtech EF Data’s RAN Optimization technology significantly reduces the WAN (satellite) bandwidth required to carry an E1 bearer used for cellular backhaul. It provides the user complete control over the desired level of optimization and link quality. Depending on the traffic profile, typical bandwidth reduction of 30-35% can be achieved with little or no impact to the voice quality. The WAN bandwidth can be reduced by as much as 60% relative to the ingress data rate, allowing users to achieve desired bandwidth savings and voice quality. The CDM-570/L provides usage statistics to assist with link monitoring. E1 RAN optimization cannot be used simultaneously with the IP Module.


Cellular networks require precise synchronization of base stations, which is a challenge when using IP backhaul. Most operators are forced to use GPS-based external equipment for site synchronization. CDM-570/L-IP offers a G.703 clock extension option that propagates a high stability reference from hub to the remote. This process does not require additional bandwidth.


With its innovative architecture and support for advanced capabilities, IP Module-equipped versions of the CDM-570/L allow for efficient IP networking and transport over satellite. The CDM-570/L-IP supports a wide range of applications and network topologies.


  • Enterprise
  • Internet Service Providers
  • Satellite Service Providers
  • Offshore & Maritime
  • Mobile Operators


  • Cellular Backhaul
  • Communications On-the-Move
  • Disaster Recovery & Emergency Communications
  • Enterprise
  • Offshore & Maritime Communications
  • Satellite News Gathering



Configurable on a per route basis, header compression reduces the bandwidth required for VoIP by as much as 60%. Example: A G.729 voice codec, operating at 8 kbps, requires 32 kbps bandwidth once encapsulated into an IP/UDP/RTP frame. With compression, the same voice call needs only 10.8 kbps total WAN satellite bandwidth. Typical Web/HTTP traffic can also be reduced by 10% via IP/TCP header compression.


Configurable on a per route basis, payload compression can reduce the required satellite bandwidth by up to 40%.


The modems support multi-level QoS to reduce jitter and latency for real time traffic, provides priority treatment to mission critical applications and allows non-critical traffic to use the remaining bandwidth. Supported modes are:

  • DiffServ – Industry-standard method of providing QoS enabling seamless co-existence in networks that implement DiffServ.
  • Max/Priority – Provides eight levels of traffic prioritization with the ability to limit maximum traffic per priority class
  • 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


  • Dynamic SCPC carrier allocation & true bandwidth-on-demand
  • User-defined policies for upstream carrier switching
  • Star and full mesh capabilities using single hop on-demand
  • Advanced switching takes advantage of using other modulation/forward error correction combinations
  • Guaranteed bandwidth capability

VMS Network & Bandwidth Management
A Vipersat-powered network integrates these advanced modems with a powerful network management tool, the Vipersat Management System (VMS). In addition to the traditional monitoring and control of the CDM-570/L-IP modems and the CDD-564/L and CDD-562L demodulators, the VMS allows these devices to share bandwidth, and when needed, switch automatically to a dedicated SCPC channel. In a Vipersat-powered network, the CDM-570/L-IP modem takes advantage of its fast acquisition demodulation to allow it to operate in a shared mode. Inbound transmissions (from remote to hub) can be switched from a shared Selective Time Division Multiple Access (STDMA) mode to a dedicated Single Carrier Per Channel (SCPC) connection via a variety of user defined policies or triggers. This enables the network to more effectively handle real-time connection-oriented applications and reduces both latency and network congestion. Through VMS, dynamic point-to-point mesh connections can also be established between remotes.

Upstream Switching
Through protocol classification in the remote terminals, the modem initiates automatic switching. VMS establishes dSCPC bandwidth based on policies that can be individually enabled on a per-remote basis, or globally enabled. Policies can be configured for a variety of applications such as VoIP, video (VTC), or based on a load, or via a schedule, Type of Service (ToS), or QoS rules such as IP port or IP address and protocol type. Operators are able to set minimum and maximum data rates for each remote as well as excess data rates for an initial upstream switch.

Vipersat Operation Mode
Vipersat operation is enabled via a FAST feature code. Networks can easily start off in point-to-point or point-to-multipoint configurations. As the network grows and users wish to take advantage of the bandwidth on-demand savings by implementing a Vipersat network, modems can easily be upgraded to Vipersat mode. Vipersat mode provides for the ability to operate in the following modulation/FEC rates:

QPSK, Rate 3/4 Turbo FEC - all STDMA modes.
Data Rate Range: 64 kbps - 4.5 Mbps
BPSK, Rate 5/16 Turbo FEC - Entry Channel Mode only.
Data Rate Range: 32 kbps to 937 kbps.

All Turbo Product Code FEC rates as detailed in the technical specifications