Table of Contents
Advertisement
SLM-7650 Satellite Modem
Operation
3.5.4
IBS Operation
The IBS mode of operation configures the modem for basic IBS operation without the
addition of the overhead card. The IBS mode is used for open network applications
operating in compliance with the IESS-309 Intelsat standard. When the IBS 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 the IESS-308
(IDR-small carrier) standard is supported in this mode. The R-S parameters that are
selected for this mode of operation are n=126, k=112, t=7 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.
3-39
Revision 4
MN/SLM7650.IOM
Advertisement
Table of Contents
