Comtech EF Data DMD-2050E - Manual (Page 244)

DMD2050E Universal Satellite Modem Efficient Drop and Insert
MN-DMD2050E Revision 2 E–2
Objective Menu Path Requirement
Find the G.703 interface card status. SYSTEM
HW/FW CONFIG
TERR INTFC BRD
01-PLR5660 or AS/4975
(or equivalent)
Find the Open Network Drop and
Insert status. SYSTEM
HW/FW CONFIG
FEATURES
UPGRADE LIST
D&I
INSTALLED (required)
Optional settings are:
ENH ASYNC
INSTALLED
AUPC
INSTALLED
Update the unit with the latest firmware, if necessary. Download the latest firmware from the
Comtech website.
E.3 Configuration Examples
The four-port G.703 Interface allows one or more modems to be looped together using the same
T1 or E1 trunk.
The Transmit Data Trunk is brought into the modem via the Send Data In (SDI) Port. From there,
the TX Baseband Processor extracts the selected timeslots from the G.704 Frame and prepares
them for transmission. The original trunk data is sent out of the modem unaltered via the Send
Data Out (SDO) Port. The Receive Data Trunk is brought into the modem via the Insert Data In
(IDI) Port. The data is buffered inside the modem and the RX Baseband Processor inserts
satellite data into the selected timeslots in the G.704 Frame. The modified terrestrial trunk is then
output via the Receive Data Out (RDO) Port.
Figure E-1 shows two modems looped together. This configuration could be simplified to just use
one modem, or extended to use more than two modems. Figure E-2 shows an alternative
method of looping where all of the drop (transmit) data is processed prior to performing any insert
(receive) processing. In both configurations, the terrestrial trunk is providing the timing for the
satellite transmission and for the terrestrial receive.