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Operation
3.
Once Drop & Insert mode has been selected, trying to change the data rate to something
other than another valid D&I data rate will result in the error message 'DATA RATE OUT
OF BOUNDS.' The change will not be allowed.
The Mod Data Rate should be set according to the number of timeslots to be dropped, and the
Demod Data Rate should be set according to the number of timeslots to be inserted. The
following table gives the allowable D&I data rates based on the number of slots (n) to be dropped
or inserted.
Number of
D&I Data Rates
Slots (n)
1
2
3
4
5
6
8
10
12
15
16
20
24
30
1,920,000 (valid with
E1 Interface only)
3.10.4 Terrestrial Framing - Drop Mode/Insert Mode
The Drop Mode selection and the Insert Mode selection identify the terrestrial data-framing
format. As previously mentioned, their selection is influenced by the mod and demod interface
types. In turn, the selection of the terrestrial framing formats influences the satellite channel to
terrestrial timeslot mappings in the following manner:
1.
The selection of T1-D4, T1-ESF, or T1-D4-S, or T1-ESF-S type terrestrial framing format
limits the terrestrial timeslots to values from 1-24.
2.
The selection of PCM-30 or PCM-30C type terrestrial framing limits the terrestrial
timeslots to values from 1-15, 17-31. In these modes, terrestrial timeslot 16 is reserved
for ABCD signaling and may not be dropped or inserted.
3.
The selection of PCM-31 or PCM-31C type terrestrial framing limits the terrestrial
timeslots to values from 1-31.
Therefore, the terrestrial framing format should be identified via the Drop Mode and Insert Mode
entries prior to editing the Drop or Insert satellite channel to terrestrial timeslot maps.
3-10
DMD2401 LB/ST L-Band Satellite Modem and ODU Driver
64,000
128,000
192,000
256,000
320,000
384,000
512,000
640,000
768,000
960,000
1,024,000
1,280,000
1,536,000
TM075 – Rev. 1.3
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