Microwave Radio Communications SCM4000, Техническое справочное руководство

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Symbol Rate C-2 SCM4000 Technical Reference Manual
In Table C-4 , a total bit rate of 52.9847 was selected as an
example.
52.9847
(rounded upward to 53.0) was located in the
Summary Rate Total
column of Table C-4 and the symbol rates
for QPSK , 16QAM , 32QAM , and 64QAM were recorded in Table
C-3 . Note that since there was no value for
QPSK
listed in
Table C-4 for
52.9847
, the symbol rate for
QPSK
is therefore
Invalid . Remember, when locating the Summary Rate Total
value in Table C-4 ,
the rate should be rounded upward
.
To determine your symbol rate, complete Table C-5 using your
SCM4000 Data Channel interface configurations. Then, locate
your
Table C-5
Total
in the
Summary Rate Total
column of
Table C-4 . The symbol rates and valid modulation types are
shown in the QPSK , 16QAM , 32QAM , and 64QAM columns.
Record these symbol rates on Table C-5 . If there is no
corresponding value listed for a modulation type in Table C-4
based on your total bit rate, that modulation type is Invalid .
For additional information, it is recommended that you contact
MRC Technical Support Systems Engineering. See
“Calling for
Service” on page 1-3 for contact information.
Table C-1: Bit Rate Calculations - Example
Standard Data
Channel Interfaces
Standard Rates
Data Channel Interface
Summary
Rates
T1/E1 1
10/100 1
T1/E1 2
10/100 2
ASI 1
DS3/E3
ASI 2
DS3/E3
ASI 3
SMPTE
RS-232/
RS-485
T1 1.544 1.544 1.544
E1 2.048 2.048 2.048
Ethernet 10/100 1-90
(12.5 Recommended) Variable
SMPTE 19.392658 19.392658 19.392658
ASI (Typically <45) Variable 10 10
DS3 44.736
E3 34.368
RS-232 (0.115 Mb/s)
RS-485 (8.0 Mb/s)
0.115 Mb/s
8.0 Mb/s
Total 32.9847