Comtech EF Data CDD-880 - Manual (Page 20)

CDD-880 Multi Receiver Router Revision 1
Introduction MN-CDD880
1–2
The CDD‐880 supports from two through 12 independent demodulators (expandable, by pairs,
on a single card) in a single 1RU chassis. It features two 10/100/1000 Gigabit Ethernet (GigE)
interfaces, and provides Comtech EF Data VersaFEC Forward Error Correction and an integrated
IP Packet Processor with Streamline Encapsulation (SLE) and Payload and Header Compression.
The Advanced VSAT Series product group can also be optionally managed by the Vipersat
Management System, specifically for situations where bandwidth requirements can dynamically
change.
• Sect. 1.3 CDD‐880 Features
• Sect. 1.4 CDD‐880 Specifications
• VMS v3.x.x VIPERSAT Management System User Guide (CEFD P/N MN/22156)
1.2 CDD-880 Functional Description
The CDD‐880’s receives VersaFEC interoperable with Comtech EF Data’s CDM‐840 / ODM‐840 /
ODMR‐840 Remote Routers and with the Comtech EF Data CDM‐625 Advanced Satellite Modem
(when equipped with its optional IP Packet Processor). The unit features six plug‐in card slots,
each of which supports a VersaFEC/Streamline dual demodulator card. This allows for six
deployed configurations: 2, 4, 6, 8, 10 and 12 demods.
The unit supports reception and transmission of IP data over satellite links via two fundamentally
different types of interface – IF and data:
• The IF interface provides uplink connectivity with the satellite.
• 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.
Overall, the receive path allows IP packets to be Streamline decapsulated, K4 decompressed if
required, and then sent to the processor. IP packets are sent out the appropriate Ethernet
interface. Optimized E1 packets are received with IP/UDP headers and routed to the appropriate
CXU‐810 RAN Optimizer on the hub network.
Note that, as IP/UDP packets, the CDD‐880 is completely agnostic/ignorant to the RAN
Optimization feature, which offers significant network feature simplicity advantages.
• Sect. 1.3 CDD‐880 Features
• Sect. 1.4 CDD‐880 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: