Comtech EF Data CDM-800 - Manual (Page 22)

CDM-800 Gateway Router Revision 1
Introduction MN-CDM800
1–2
The CDM‐800 features two 10/100/1000 Gigabit Ethernet (GigE) interfaces, one 10/100 Fast
Ethernet (FE) interface, and provides WAN bandwidth optimization. The unit also features
DVB‐S2 FEC coding.
• Sect. 1.3 CDM‐800 Features
• Sect. 1.4 CDM‐800 Specifications
1.2 CDM-800 Functional Description
The CDM‐800 Gateway Router:
• Is compatible with Comtech EF Data’s CDM‐840 Remote Router for Variable Coding and
Modulation (VCM) 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 uplink connectivity with the satellite.
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.
DVB‐S2 Transmitter: The CDM‐800’s modulator supports enhanced GSE encapsulation and label
filtering insertion for up to 2,047 unique labels. It supports DVB‐S2 QPSK, 8‐PSK, 16‐APSK and 32‐
APSK modulation up to 62 Msps with transmit data rates up to 160 Mbps depending on the
modulation type and code rate,
In DVB‐S2 operation, the transmitter operates in the VCM mode. The receive modem
automatically detects for spectral inversion pilots ON/OFF, spectral rolloff of 20%, 25% or 35%,
frame size NORMAL/SHORT, and can also be configured to automatically detect the modulation
coding (MODCOD).
• Sect. 1.3 CDM‐800 Features
• Sect. 1.4 CDM‐800 Specifications
• Appendix B. FEC (FORWARD ERROR CORRECTION)
The unit is managed through multiple interfaces providing options for both in‐band and out‐of‐
band monitor and control: