Chapter 5 Configuring the Meter
Configure – Measure Tab
DSAM Help User Guide Rev. 001 61
DOCSIS
Throughput
Use the DOCSIS Throughput screen to:
– Set a downstream HTTP server IP address
– Define a relative path to the file and file name to be transferred by
the meter
Configuring DOCSIS
Throughput
To configure DOCSIS throughput
1 Press Configure.
Signal Quality
128 QAM
The minimum signal quality at 128 QAM before it
falls below your set limit. The default value is 32.0
dB if digital the performance unit is set to MER in
Regional Preferences. The default value is 1.08 if
the digital performance unit is set to EVM in
Regional Preferences.
Signal Quality
256 QAM
The minimum signal quality at 256 QAM before it
falls below your set limit. The default value is 32.0
dB if digital the performance unit is set to MER in
Regional Preferences. The default value is 1.55 if
the digital performance unit is set to EVM in
Regional Preferences.
Max Pre BER The maximum bit error rate prior to forward error
correction before it exceeds your set limit. The
default value is 1.0E-7.
Max Post BER The maximum bit error rate after forward error cor-
rection before it exceeds your set limit. The default
value is 1.0E-9.
Min CM Head-
room (dB)
The minimum cable modem headroom (in decibels)
before it exceeds your set limit. The default value is
5.0.
Max Ingress The maximum amount of noise before it exceeds
your set limit. The default value is -30.0.
Min CN Level The minimum carrier-to-noise before it exceeds
your set limit. The default value is 43.0.
Max Hum Level The maximum undesired modulation before it
exceeds your set limit. The default value is 3.0%
(-30.5dB) per FCC limit.
Table 22 Limit Set Parameters (Continued)
Name Description
21128026 R001 DSAM Help User Guide.book Page 61 Thursday, February 5, 2009 2:02 PM
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