Comtech EF Data CDM-840 - Manual (Page 26)

CDM-840 Remote Router Revision 2
Introduction MN-CDM840
1–2
network environments that require high-performance, high-quality IP transport with “always-
on” availability.
The CDM-840 features one 10/100/1000 Gigabit Ethernet (GigE) interface, one 10/100 Fast
Ethernet (FE) interface, and provides WAN bandwidth optimization. It also features integrated
VersaFEC, a patented system of short-block codes that provide maximum coding gain with
lowest possible latency.
• Sect. 1.3 CDM-840 Features
• Sect. 1.4 CDM-840 Specifications
1.2 CDM-840 Functional Description
The CDM-840 Remote Router:
• Transmits VersaFEC interoperable with Comtech EF Data’s CDD-880 Multi-Receiver
Router. The receive side supports DVB-S2 operation at L-Band up to 62 Msps, and is
compatible with Comtech EF Data’s CTOG-250 Comtech Traffic Optimization
Gateway/CDM-800 Gateway Router for Constant Coding and Modulation (CCM)
operation.
• Features a high performance processor and a real-time operating system (RTOS)
combined with multiple Field Programmable Gate Arrays (FPGAs).
• Runs on an embedded operating system in non-volatile Flash memory. It does not have
moving parts for media storage.
• Supports reception and transmission of IP data over satellite links via two fundamentally
different types of interface – IF and data:
o
The IF interface provides a bidirectional link with the satellite via the uplink and
downlink equipment.
o
The data interface is a bidirectional path that connects the customer’s equipment
(assumed to be the Data Terminal Equipment, or DTE) to the unit (assumed to be
the Data Communications Equipment, or DCE). All terrestrial data is connected
using the available 10/100/1000 Gigabit Ethernet interface.
• Includes support for ACM (Adaptive Coding and Modulation) and CCM (Constant Coding
and Modulation) operation:
o
CCM allows operators to define groups of remotes having different modulation
and coding parameters, as a means to improve efficiency on existing satellite
capacity.