Comtech EF Data DMD-2050E - Manual (Page 261)

DMD2050E Universal Satellite Modem Efficient Drop and Insert
MN-DMD2050E Revision 2 E–19
E.6 D&I Maps and Map Editing
The Drop and Insert multiplexer is programmed by loading it with a transmit and receive map.
Maps always contain 30 entries, although, only the first “n” entries are relevant (see Table E-1).
The modem includes provisions to copy, change, and store the D&I transmit and receive maps
directly from the Front Panel or via the remote MandC link. These maps are tables that are used
to define and configure the D&I functions. Each map contains up to 30 entries, which are enough
to define the channel assignments for a T1 (24 channel) or E1 (30 channel) frame structure.
Maps that are created are stored in non-volatile battery backed-up memory within the modem and
remain unchanged after a power-down.
Table E-1. D&I Multiplexer Map Locations Used
Data Rate (Kbps) Map Locations Used (n = 1, 2,4,8,16,24,30)
64 1
128 1-2
256 1-4
384 1-6
512 1-8
768 1-12
1024 1-16
1536 1-24
1920 1-30
It is important to understand that each map contains up to 30 usable entries. In many cases a
smaller number of entries will be relevant, except when the data rate is 1920 Kbps, in which case
30 entries will used by the multiplexer. To determine the number of relevant entries, divide the
data rate by 64 Kbps.
For example:
At 384 Kbps, 384/64 = 6 entries.