Comtech EF Data OM20 - Manual (Page 57)

OM20 Universal Outdoor Modem OM20 Theory of Operation
MN-OM20– Revision 5 4–19
1536 768 576 9600
1664 832 640 19200
1792 896 704 19200
1920 960 768 19200
1920 960 768 19200
2048 1024 832 19200
896 19200
960 19200
1024 19200
1088 19200
1152 19200
1216 19200
1280 19200
1344 19200
1408 19200
1472 19200
1536 19200
1600 19200
1664 19200
1728 19200
1792 19200
1856 19200
1920 19200
1984 19200
2048 19200
4.13 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 4-3 below:
Table 4-3.
Bit 1 ES to ES Data
Channel This bit is routed directly to the ES to ES Data Channel.
Its data rate is 1/512
th
of the aggregate rate (or 1/480
th
of
the through terrestrial data rate), and is normally used to
super-sample an asynchronous data channel.