ZyXEL Elite 2864 User Guide - Page 215

Retrains Requested Number of times the local modem has requested a retrain. Each request is an indicator of bad receiving conditions. Retrains Granted Number of times retrains requested by the remote modem were granted. Link Duration Connection time in minutes. T401 Timeouts and T402 Timeouts These are for the manufacturer checking link layer operation. T401 and T402 are timers used in MNP4 or V.42. T402 will count when the modem is connected in the idle state with no data to transmit or receive. FCS Errors Frame CheckSum Errors/number of block errors. A lot of FCS errors indicate a bad line. Round Trip Delay Round trip delay between modems in T (1/2400 sec) units. Normally should be in the range of 0-100. A satellite link will introduce a delay of about 1300 T. Xmitter Underrun Number of times the modem fails to provide data octet in time for transmission. Receiver Overrun Number of times the modem fails to take data octet in time from receiver. Last speed/protocol The speed and protocol of the link before hang-up. It may be different from the initial speed because of retrain and speed fall-back or fall-forward. Speed change is a clue to changing line conditions. Disconnect Reason Possible reasons are: • Local Hang-up • Remote Hang-up • Carrier Lost • On Line • Resent Expiration • Protocol Error • Break Timeout • DTR Dropped • Carrier Lost 1 (No handshaking response) • Carrier Lost 2 (Remote hang-up, busy tone heard) 18-9