Comtech EF Data SDM-300L - Manual (Page 75)

Options SDM-300L Satellite Modem
A–2 Rev. 2
Table A-1. FAST Options and Required Configurations
Hardware S
in
g
le Data Rate
L
o
w
V
a
ri
a
b
le
Da
ta
R
a
te (up
to
5
1
2
M
/b
its)
H
igh
Va
ri
ab
le
D
a
ta
R
a
te
(up t
o
4
..
3
7
5
M
/bi
ts
)
V
ite
rb
i De
co
d
er
S
eq
u
en
ti
al
Dec
o
d
er
A
syem
m
et
ri
ca
l L
oop
T
im
in
g
OQ
P
S
K
G
.703
AS
YNC/AUPC Ove
rh
ea
d
R
eed
-S
ol
o
m
o
n
Co
d
ec
Basic Platform 300L
X X
(Note)
X
(Note)
FAST Options X X X X X X
FAST Options with
Overhead Hardware
X X
FAST Options with
Reed-Solomon Hardware
X
Note:
The basic modem is shipped with either Sequential or Viterbi decoder. Optional: A unit can be
shipped with both Viterbi and Sequential decoders.
A.1.1 FAST System Theory
FAST is an enhancement feature available only in Comtech EFData products, enabling
on-location upgrade of the operating feature set—in the rack—without removing a
modem from the setup. When service requirements change, the operator can upgrade the
topology of the modem to meet those requirements within minutes after confirmation by
Comtech EFData. This accelerated upgrade can be accomplished only because of FAST’s
extensive use of programmable devices incorporating Comtech EFData-proprietary signal
processing techniques. These techniques allow the use of a unique access code to enable
configuration of the available hardware. The access code can be purchased at any time
from Comtech EFData. Once obtained, the access code is loaded into the unit through the
front panel keyboard or the rear remote port.
With the exclusive FAST technology, operators have maximum flexibility for enabling
functions as they are required. FAST allows an operator to order a modem precisely
tailored for the initial application, reducing risk and cost overruns during the application
integration process.