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OM20 Universal Outdoor Modem
FEATURES
UPGRADE LIST
D&I
INSTALLED
ENH ASYNC
INSTALLED
AUPC
INSTALLED
F.3
Efficient Drop & Insert Mode
With Efficient Drop & Insert, the terrestrial interface selections, terrestrial framing modes,
terrestrial to satellite mapping, ES to ES channel, satellite and terrestrial backward alarm
functionality, and the In Station Prompt and Deferred Service alarm operation are identical to
that of the Open Network standard. In addition, the selection and operation of Enhanced Async
and AUPC are identical to their closed network IBS counterparts. For more information on these
selections, refer to the appropriate section of the User's manual.
The following menu selections are utilized for controlling the additional functionality available
with efficient Drop and Insert:
MODULATOR or DEMODULATOR
NETWORK SPEC
CLOSED NET
SAT FRAMING
EFFICIENT D&I
DATA
DATA RATE (bps)
N x 64000
SCRAMBLER CTRL
DISABLED
MN-OM20– Revision 5
required
optional, required if desired
optional, required if desired
Efficient Drop & Insert is a Closed Network selection
The satellite frame type is Efficient Drop & Insert
The data rate can be set to any N x 64 kbps rate based on the desired
number of drop or insert slots. The following values of N are allowed
based on the terrestrial interface and terrestrial framing types shown
T1
Any framing
E1
Any PCM31
E1
Any PCM30
The Efficient Drop & Insert mode utilizes a frame synchronous energy
dispersal technique that is always on, thus there is no need for any
additional scrambling
Any N from 1 to 24
Any N from 1 to 31
Any N from 1 to 30 as TS 16 is automatically
transmitted
Appendix F
F–2
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