Comtech EF Data DMD-2050E Especificaciones descargar pdf (Pagina 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.

1 2 ... 256 257 258 259 260 261 262 263 264 265 266 ... 341 342

Sin comentarios

Comtech EF Data DMD-2050E Especificaciones Pagina 261