Comtech EF Data CDM-570/L & CDM-570/L-IP Satellite Modems

Product Specification

TURBO PRODUCT CODING

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.

EDMAC & AUPC OPERATION

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.

MANAGEMENT

The modem supports SNMP, web-based and command line interfaces for management. The modem 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.

E1 RAN OPTIMIZATION (POINT-TO-POINT)

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.

G.703 CLOCK EXTENSION 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.

IP MODULE

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.

Header Compression Option

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.

Payload Compression Option

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

Quality of Service (QoS) Option

The modem supports 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 8 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