Comtech EF Data DMD-2050E Installation And Operation Manual page 301

DMD2050E Universal Satellite Modem
time slots of the T1 or E1 frame. The Multiplexer would know to look only at the first four entries
in the Active map(s) and would ignore the other 26 entries.
ROM Map 4 could be used as the template for an Active Transmit (Drop) or Active Receive
(Insert) Map with a modulator and/or demodulator configured for 384 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 six time slots of the T1 or E1 frame. The Insert Multiplexer would
know to look only at the first six entries in the Active map(s) and would ignore the other 24
entries. To Drop the last six channels of a T1 frame into a modulator transmit path, the first six
entries of the Active Transmit map should contain 19, 20, 21, 22, 23, and 24.
ROM Map 5 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 512 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 eight time slots of the T1 or E1 frame. The Multiplexer would know to
look only at the first eight entries in the Active map(s) and would ignore the other 22 entries.
To insert data received from a demodulator into channels 17 through 24 of an E1 frame, the first
eight entries of the Active Receive map should contain 17, 18, 19, 20, 21, 22, 23, and 24.
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.
MN-DMD2050E Revision 2
Efficient Drop and Insert
E–22