TM 11-5820-803-12
d. Coordinate with the remote ICF modem site to
V p-p.
return to the operational data rate.
If necessary, readjust R2 to obtain an amplitude of 1.2 V
e. Monitor TP2 and, if necessary, readjust R2 to
p-p.
obtain an amplitude of 1.2 V p-p.
Table 2-5. Direct Digital Output Interface Polarity Selection.
Switch
Positioning
Function
A2A2A1A21S1
1
Selects normal polarity of internal clock output.
2
Selects inverted polarity of internal clock output.
A2A2A1A21S2
-
Not used.
A2A2A1A22S1
1
Selects normal polarity of standard data output.
2
Selects inverted polarity of standard data output.
A2A2A1A22S2
1
Selects normal polarity of standard clock output.
2
Selects inverted polarity of standard clock output.
A2A2A1A23S1
1
Selects normal polarity of alternate data output.
2
Selects inverted polarity of alternate data output.
A2A2A1A23S2
1
Selects normal polarity of alternate clock output.
2
Selects inverted polarity of alternate clock output.
Table 2-6. External Coder/Decoder Interface Clock Polarity Selection.
Switch
Positioning
Function
A2A2AA5S1
1
Selects normal polarity of 2R clock from external encoder.
2
Selects inverted polarity of 2R clock from external encoder.
A2A2A2A5S2
I
Selects normal polarity of R clock from external decoder.
2
Selects inverted polarity of R clock from external decoder.
A?A22AA5S3
1
Selects normal polarity of R clock to external encoder.
2
Selects inverted polarity of R clock to external encoder.
A2A2A2A5S4
1
Selects normal polarity of 2R clock to external encoder.
2
Selects inverted polarity of 2R clock to external encoder.
A2A2A2A5S5
1
Selects normal polarity of R clock to external decoder.
2
Selects inverted polarity of R clock to external decoder
A2A2A2A5S6
1
Selects normal polarity of 2R clock to external decoder.
2
Selects inverted polarity of 2R clock to external decoder.
Table 2-7. LOS/Cable Receiver and Decoder Switch Settings.
Switch setting
on A2A2A2A1
Conditions
S1
S2
S3
S4
Input data rate 19.200 kb/s to 225.00 kb/s
1
2
3
NA
LOS microwave interface
Input data rate 225.01 kb/s to 1.8000 Mb/s'
2
2
3
NA
Input data rate 1.8001 Mb/s to 5.0000 Mb/s
3
2
3
NA
50-ohm unbalanced cable Long
1
1
1
1
Midrange
1
1
2
1
Short
3
1
2
1
75-ohm unbalanced cable Long
1
1
1
2
Midrange
1
1
2
2
Short
3
1
2
2
76-ohm balanced cable Long
1
1
1
3
Midrange
1
1
2
3
Short
3
1
2
3
NOTE
1. Long cable ≥ 4000 ft. for RG-217/U.
2. Mid-range cable = 1000 to 4000 ft. for RG-217/U.
3. Short cable ≤1000 ft. for RG-217/U.
4. Refer to paragraph 2-9 b for length classifications of other cable types.
2-27
