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01-0868-401B 12/02
Troubleshooting
Satellite Link Margins
The E
b
/N
0
value displayed is the estimated E
b
/N
0
level of the receive signal in
units of dB. This value, when used in conjunction with the DVB minimum
performance requirements, indicates the link margin for the transmission. The
minimum E
b
/N
0
levels required for successful reception of a signal that will
guarantee flawless video performance at each Viterbi code rates is listed in the
table below. An E
b
/N
0
value at least 3 dB above these limits is reasonable. E
b
/N
0
levels that drop near the DVB limits may cause interrupted or poor quality video
service. Refer to the table of E
b
/N
0
vs. Viterbi code rate performance levels
provided in the Receive Signal E
b
/N
0
section.
Maintenance
The TDR60 requires no periodic or preventative maintenance other than keeping
the cooling fan intake grills free of obstruction.
