RFUnderstanding IDR: Intermediate Data Rate for Satellite Communication
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IDR stands for Intermediate Data Rate, a technology specifically designed to provide E1 connectivity through a satellite network. It operates at a rate of 2.048 Mbps and its multiples.
IDR technology adheres to the standard compliance and performance requirements for IDR carriers as defined by IESS 308/310.
The satellite bandwidth occupied by an IDR carrier is approximately 0.7 times the transmission rate when using QPSK modulation. With 8-PSK modulation, this drops to around 0.467 times the transmission rate.
IDR Equipment
IDR equipment is specialized to support IDR data rates and typically includes:
- Satellite modem
- RF up converter
- RF down converter
- Switch over units
- And other related components
This equipment is generally compliant with all satellite earth stations that operate with INSAT-based systems.
RF Conversion
The RF up converter is responsible for converting the intermediate frequency (IF) in the range of 52-88 MHz to the radio frequency (RF) in the C band range (5.925GHz to 6.425GHz), without frequency inversion.
Conversely, the RF down converter converts the C band RF frequency back to the IF frequency.
Modem Interface and Redundancy
The satellite modem interfaces using baseband and RF. The Modem SWO (Switch Over) unit provides N+1 redundancy, where N can be up to a maximum of 8.
The Up/Down Converter SWO unit offers 1+1 redundancy.
C-DOT IDR Equipment Features
The C-DOT IDR Equipment provides a user interface that supports comprehensive:
- Monitoring
- Diagnostics
- Administrative functions
