Appendix I. Efficient Drop And Insert (D&I; Efficient Drop & Insert Mode - Radyne DMD20 Installation And Operation Manual

DMD20/20LBST Universal Satellite Modem
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
SCRAMBLER CTRL
DISABLED
INBAND RATE
150
300
600
1200
2400
4800
9600
19200
MN-DMD20-20LBST Revision 14
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
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 optimized
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 higher than the TX & RX Async/ES port baud rate.
When this 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 & Insert
Any N from 1 to 24
Any N from 1 to 31
Any N from 1 to 30 as TS 16 is
automatically transmitted
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