ZyXEL Elite 2864 User Guide - Page 212

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. > 0 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. 18-6