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SLM-7650 Satellite Modem
Operation
3.5.6
IBS-309 Operation
The IBS-309 mode of operation configures the modem for basic IBS operation without
the addition of the overhead card. The IBS-309 mode is used for open network
applications operating in compliance with TN309.5 of the IESS-309 Intelsat standard.
When the IBS-309 mode is active, an overhead of 6.667% will be added to the selected
data rates. The available IBS data rates are n x 64 kbps from 64 kbps to 2.048 Mbps.
Optional Reed-Solomon (R-S) concatenated outer coding compatible with TN309.5 of
the IESS-309 (IBS) standard is supported in this mode. The R-S parameters that are
selected for this mode of operation are n=219, k=201, t=9 with an interleaver depth of 4.
Operation in this mode requires the IBS framing option to be activated. The data type
will be MIL-188 (RS-422) and there will not be any access to the Intelsat defined ESC
overhead data. An optional overhead card is required for G.703 or any other baseband
interface and to gain access to the ESC overhead data.
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Revision 4
MN/SLM7650.IOM
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