ZyXEL Communications 2864 Series, User Manual, Page: 215 / 267

18–9
Retrains Requested
Number of times the local modem has requested a retrain. Each request is an indi-
cator 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 in-
itial 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)