Comtech EF Data CDM-625, Инструкция по установке и эксплуатации

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CDM-625 Advanced Satellite Modem Revision 1
Front Panel Operation MN-0000036 (Ref MN/CDM625.IOM)
TPC (with TPC/LDPC
Codec installed)
BPSK
QPSK, OQPSK
8-PSK (FAST option)
16-QAM (FAST option) 5/16, 21/44
1/2 (aka 21/44), 3/4, 7/8, 0.95
3/4, 7/8, 0.95
3/4, 7/8
LDPC (with TPC/LDPC
Codec installed)
BPSK
QPSK, OQPSK
8-PSK, 8-QAM (FAST)
16-QAM (FAST option) 1/2
1/2, 2/3, 3/4
2/3, 3/4
3/4
If the TPC/LDPC Codec is installed and TPC is selected from the FEC menu, the options appear
as shown:
Modulation=QPSK (B,Q OQ,8PSK,16Q,8QAM)
FEC Rate=1/2 (1/2,3/4,7/8,0.95) (
34v
)
5.4.3.6 CONFIG: Tx
Æ
Data
Tx Data Rate = 01544.000 kbps
Data Invert = Off (Off,On) (
34v
)
The top line permits the Data Rate to be edited. Select the digit of Data Rate to be edited using the
◄
► arrow keys. Change the value of the digit using the
▲ ▼
arrow keys, then press
ENTER
.
The maximum limits for the data-rate are 18kbps to 25Mbps. The actual minimum and maximum
data rates are dependent on Framing mode, Interface type, Modulation type and FEC Code Rate.
If the user changes any of the higher-priority parameters – causing the data rate to become invalid
– the
Data Rate
is adjusted automatically. The upper range of data rate will also be dictated by
the
FAST option(s)
installed.
When configured for D&I or IDR framing or for G.703 interface type, the
▲ ▼
arrow keys scroll
through only the available data rates. If in D&I framing and the data rate is edited to 1920 kbps, a
comment is shown to indicate that E1 Fixed Channel Mode will be implemented.
When G.703 is used, three auxiliary rates (512, 1024 and 2048 kbps) will also be available and are
indicated by the word
AUX
appearing to the right of the decimal place (
for example:
00512.AUX
kbps
).
For information on how to connect the cables for the AUX G.703 data rates, refer to the IDI /
DDO connectors section of the table in
Section 1.3.1.2 Rear Panel
(
Chapter 1.
INTRODUCTION)
.
In QDI (Quad D&I) mode, these data rates are
read-only
! The data rate will be the sum of the
tributary rates for all ports, and must be edited via the QDI menu.
The bottom line permits the user to select the Data Inversion feature (added for compatibility with
certain older equipment). Select either
On
or
Off
using the
▲ ▼
arrow keys, then press
ENTER
.
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