Comtech EF Data OM20 User Manual

Page 200

OM20 Universal Outdoor Modem

Appendix F

MN-OM20– Revision 5

F–2

FEATURES
UPGRADE LIST
D&I
INSTALLED

required

ENH ASYNC
INSTALLED

optional, required if desired

AUPC
INSTALLED

optional, required if desired

F.3

Efficient Drop & Insert Mode

With Efficient Drop & Insert, the terrestrial interface selections, terrestrial framing modes,
terrestrial to satellite mapping, ES to ES channel, satellite and terrestrial backward alarm
functionality, and the In Station Prompt and Deferred Service alarm operation are identical to
that of the Open Network standard. In addition, the selection and operation of Enhanced Async
and AUPC are identical to their closed network IBS counterparts. For more information on these
selections, refer to the appropriate section of the User’s manual.

The following menu selections are utilized for controlling the additional functionality available
with efficient Drop and Insert:

MODULATOR or DEMODULATOR
NETWORK SPEC
CLOSED NET

Efficient Drop & Insert is a Closed Network selection

SAT FRAMING
EFFICIENT D&I

The satellite frame type is Efficient Drop & Insert

DATA
DATA RATE (bps)
N x 64000

The data rate can be set to any N x 64 kbps rate based on the desired
number of drop or insert slots. The following values of N are allowed
based on the terrestrial interface and terrestrial framing types shown

Any framing

Any N from 1 to 24

Any PCM31

Any N from 1 to 31

Any PCM30

Any N from 1 to 30 as TS 16 is automatically

transmitted

SCRAMBLER CTRL
DISABLED

The Efficient Drop & Insert mode utilizes a frame synchronous energy
dispersal technique that is always on, thus there is no need for any
additional scrambling