ZyXEL Communications 2864 Series, User Manual, Page: 212 / 267

18–6
Received Signal Power Level (RX)
This reading is expressed in 0.1 dBm resolution. The modem-measured receiving
signal power is generally within 1-2 dBm of the actual value with relative accuracy.
The receiver sensitivity specification for the 2864 is -43 dBm. Strong signal power
could cause signal saturation in the channel and degrade the data validity. To avoid
this situation, decrease the transmission power of the remote modem. For increased
line operability, the 2864's transmission power level on a leased-line operation could
be adjusted from 0 dBm to -27 dBm. The default value is -9 dBm.
Phase Jitter (PJ)
This reading is expressed in peak-to-peak degrees for phase jitter in the 20 to 300 Hz
frequency range in 0.1 degree resolution.
Frequency Offset (FO)
Frequency offset is expressed in 0.1 Hz resolution. It is the difference between the
transmitted carrier frequency and the received carrier frequency.
In the ON-LINE SCREEN 3 there are four counters recording the action or reaction
the modem took when the line condition changed.
Retrain Granted (RG)
The count of the granting of the remote modem's retrain requests. Each request is
an indicator of bad receiving conditions.
Retrain RequesTed (RT)
The count of the local modem's requests for the remote modem to retrain when the
signal quality is poor.
Round Trip Echo Delay (ED)
Measured in T (1/2400 sec.). Will be re-measured in every retrain action.
Carrier Loss Counter (CL)
When operated over a leased line, it is the count of the carrier's temporary drop-out,
if there is any.
<< RG= 0 RT= 0 >>
ED= 28 CL = 0