Comtech EF Data DMD50 Installation And Operation Manual page 250

DMD50 Universal Satellite Modem
ROM Map 6 could be used as the template for an Active Transmit (Drop) and/or Active Receive
(Insert) Map with a modulator and/or demodulator configured for 768 Kbps operation. The T1
or E1 Data in the transmit path or the demodulated data in the receive path would be dropped
from and or inserted into the first 12 time slots of the T1 or E1 frame. The Multiplexer would
know to look only at the first 12 entries in the Active map(s) and would ignore the other 18
entries. To insert data received from a demodulator into channels 3 through 14 of an E1 frame,
the first 12 entries of the Active Receive map should contain 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, and
14.
ROM Map 7 could be used as the template for an Active Transmit (Drop) and/or Active Receive
(Insert) Map with a modulator and/or demodulator configured for 1920 Kbps operation. This
would be used with E1 frames where time slot 16 is not used for the multiframe alignment signal
and therefore channels 1 through 30 are mapped directly with time slots 1 through 30.
ROM Map 7 could also be used as the template for an Active Transmit (Drop) and/or Active
Receive (Insert) Map with a modulator and/or demodulator configured for 1024 Kbps operation.
This would be used with T1 or E1 frames where channels 1 through 16 are mapped into time
slots 1 through 16 (in any order). Map slots 17 through 30 would be ignored.
ROM Map 7 could also be used as the template for an Active Transmit (Drop) and/or Active
Receive (Insert) Map with a modulator and/or demodulator configured for 1536 Kbps operation.
This would be used with T1 frames where channels 1 through 24 are mapped into time slots 1
through 24 (in any order). Map slots 25 through 30 would be ignored.
ROM Map 8 could also be used as the template for an Active Transmit (Drop) and/or Active
Receive (Insert) Map with a modulator and/or demodulator configured for 1920 Kbps operation.
However, this mapping would be relevant with E1 frames where time slot 16 is used for the
multiframe alignment signal and therefore channels 1 through 30 are mapped to time slots 1
through 16 and 17 through 31.
MN-DMD50– Revision 3
Drop and Insert (D&I)
H–18