Standard Ibs Mode - Radyne DMD20 Installation And Operation Manual

Theory of Operation

3.17 Standard IBS Mode

In the first or "Normal" mode, all bit assignments are per the IBS standard. The bits of Overhead
Housekeeping byte 32 are implemented as shown in Table 3-4 below:
Bit 1 ES to ES Data
Channel
Bit 2 Frame Alignment
Bit 3 Backward Alarm
Bit 4 Multiframe Message
Bits 5 and 6 Spare
Bits 7 and 8 Encryption Utilization
3-24
896
960
1024
1088
1152
1216
1280
1344
1408
1472
1536
1600
1664
1728
1792
1856
1920
1984
2048
Table 3-4.
This bit is routed directly to the ES to ES Data Channel.
th
Its data rate is 1/512 of the aggregate rate (or 1/480
the through terrestrial data rate), and is normally used to
super-sample an asynchronous data channel.
Part of the Frame Alignment word.
Transmit and Receive with main processor to activate
Main Alarm/LED.
As per IBS.
Not currently utilized.
Not currently utilized.
DMD20 Universal Satellite Modem
19200
19200
19200
19200
19200
19200
19200
19200
19200
19200
19200
19200
19200
19200
19200
19200
19200
19200
19200
TM103 - Rev. 1.1
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