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DMD50 Universal Satellite Modem
AUPC
INSTALLED
I.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 Drop & Insert 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 The data rate can be set to any N x 64 kbps rate based on the desired
SCRAMBLER CTRL
DISABLED The Efficient Drop & Insert mode utilizes a frame synchronous energy
INBAND RATE
150
300
600
1200
2400
19200
MN-DMD50 Revision 4
optional, required if desired
Efficient Drop & Insert is a Closed Network selection
The satellite frame type is Efficient Drop & Insert
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
dispersal technique that is always on, thus there is no need for any
additional scrambling
This menu is available when enhanced async is enabled. This
field allows the operator to select a desired Earth Station to Earth
Station in-band rate. This allows the user to optimize the In-
Band
Rate based on the amount of traffic that will pass over the.
satellite. In most cases, this should be set to the same rate or 4800
higher than the TX & RX Async/ ES port baud rate. When this 9600
rate is set lower than the ES port baud rate, the user must insure
that the actual ES to ES transmission rate does not exceed the
In-Band Rate, otherwise characters will be dropped.
Efficient Drop and Insert (D&I)
Any N from 1 to 24
Any N from 1 to 31
Any N from 1 to 30 as TS 16 is
automatically transmitted
I–2
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