ZyXEL Communications U-336R/RE User Manual page 133

Received Signal Power Level (RX)
This reading is expressed in 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 your modem 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, your modem's
transmission power level on a leased-line operation could be
adjusted from 0 dBm to -27 dBm. The default value is -11 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 1 degree resolution.
Frequency Offset (FO)
Frequency offset is expressed in 1 Hz resolution. It is the difference
between the transmitted carrier frequency and the received carrier
frequency.
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.
Diagnostics & Troubleshooting 121