Idr Operation - Comtech EF Data SLM-7650 Installation And Operation Manual

SLM-7650 Satellite Modem
Operation
3.5.3

IDR Operation

The IDR mode of operation configures the modem for basic IDR operation without the
addition of the overhead card. The IDR mode is used for open network applications
operating in compliance with the IESS-308 (IDR) and IESS-310 (TCM-IDR) Intelsat
standards. When the IDR mode is active, a fixed overhead of 96 kbps will be added to
the selected data rates. Within the data rate range of the modem, there are four IDR
operating rates, 1.544, 2.048, 6.312, and 8.448 Mbps.
Optional Reed-Solomon (R-S) concatenated outer coding compatible with the IESS-308
and IESS-310 standards is supported in this mode. Refer to the modem specification for
the specific R-S parameters that apply to each data rate.
Operation in this mode requires the IDR 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.
3-37
Revision 4
MN/SLM7650.IOM