SHAPING THE FUTURE OF SATELLITE COMMUNICATIONS
1 INTRODUCTION
1.1 Description
1.1.1 EL170 IP Satellite Modulator
The EL170 is a state-of-the-art satellite modulator designed for IP applications over
satellite in full compliance with the DVB standards. As a real IP product, this
modulator performs IP processing functions such as packet filtering, routing and
encapsulation. Depending on the applications and the activated features, the
EL170 can be used in conjunction with consumer satellite IP receiving devices,
professional IP receivers such as the EL940, or professional satellite IP
demodulators such as the EL970.
The EL170 offers an auto-switching Gigabit Ethernet interface and integrates
seamlessly with terrestrial IP networks and equipment. The incoming IP packets
can be filtered using e.g. VLAN or MAC addresses, transmitted transparently (data
piping mode) or routed to several receiving points and destination addresses.
Several routing and addressing mechanisms can be used and even combined.
• Routing to the MAC address of the IP receivers is achieved by using Multi-
Protocol (MPE), Ultra Light (ULE) encapsulation, or with the more efficient
proprietary Extended Performance (XPE) Encapsulation;
• Addressing using several PIDs (MPE or ULE only);
• Addressing using several stream identifiers (with the DVB-S2 multi-stream
mode).
With the Variable Coding and Modulation (VCM) option, the modulator allows each
stream to be transmitted with its own set of modulation parameters.
At the output of the modulator, the signal is available on an L-band interface.
Extended L-band, IF-band as well as BUC power supply and reference frequency
are available as configuration options, providing a compact and cost effective
solution.
For maximum bandwidth efficiency, the EL170 can also be used in Adaptive
Coding and Modulation (ACM) mode, modifying the modulation parameters
dynamically in function of the link conditions. An embedded FlexACM controller
option is available for point-to-point applications, while the optional Base-Band
Frame input option allows the EL170 to work with the external Shaper,
Encapsulator and FlexACM controller EL860 in point-to-multipoint configurations.
When activated, the unique linear and non- linear predistortion option Equalink™
provides an additional link margin improvement of up to 2dB, truly unleashing the
full efficiency of higher modulation schemes such as 16 and 32 APSK.
Combining new innovative features and advanced data encapsulations protocols
with DVB-S2 technology, the EL170 ensures the highest bandwidth efficiency
available on the market.
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