Broadband processors

OBMM – Technical Overview

Flexible connectivity between small gateways and user–user terminals in multi-beams
37.125 MHz bandwidth, regenerative switchable on a MPEG packet basis
Uplink (nine sub-channels/channel)
- DVB-RCS (MPEG profile) MF-TDMA, QPSK
- 1 HR (4224kbps), 2 MR (2112 kbps) or 8 LR (528 kbps) carriers per sub-channels
Downlink
- Single DVB-S TDM carrier per channel
Controller support both standard
- Spacecraft TMTC
- 100 kbps high speed TMTC via traffic carriers
Utilises advanced second-generation packaging
Unit capacity range from 6 to 27 active channels plus redundancy
- Small unit (typically): <3.8 kg and <50 W per channel
- Large unit (typically): <3 kg and <45 W per channel

Features / technical details

Uplink key parameters

Dynamic range: 10 dB (nom) +10 dB headroom
64 bursts/frame, 1, 4, 8 packets/burst, 128 sym preamble
Turbo decoding R 1/3, 1/2, 3/4, 4/5, 6/7, 7/8
Min 7.1 dB Es/No for QEF @ R1/2, 3/4 inc phase noise
Errored packet detection: programmable, nom four undetected errored packet per day.

Downlink key parameters

Uplink to Downlink routing flexibility

Full spatial and time switching at packet level for cross connectivity, multicast, min 16.5 kbps granularity
Supports seamless reconfiguration of traffic mapping

Synchronisation supported by

Onboard NCR generation and MPEG2 PCR insertion
2 7MHz clock reference
Supports Interrogation/TM packets for burst Es/No, freq and timing data, carry forward of add payload data
TM on bursts outside nom power range

Telecommunications