User Guide Modem 3460

3460 Fast’R
5-7
If Mode=Normal
(AT
*
SM1), check line
quality:
• Check CQMS
parameters with
Fast’RVu
• Run a remote digital
loopback (RDL) or
RDL with pattern test
• Disconnect the
modem from the line.
Run a local analog
loopback (LAL)
(AT&T1), or LAL
pattern test (AT&T8),
with modem flow
control off.
If no RDL errors occur, the line
is OK.
If errors occur, perform a
manual retrain, or retry the
phone call.
If the modem fails, contact
Motorola customer service.
If the modem passes, there may
be a line problem (contact
telephone company) or a
software problem (check with
software vendor).
Modem stops
passing data
Modem could be in
“flow off” condition
(modem set for XON-
XOFF and computer
set for hardware flow
control).
Set the modem for hardware
flow control (AT
*
FL3).
The modem
connects at a
lower rate than
Max Rate
(AT
*
MX)
option.
Check CQMS
parameters with
Fast’RVu.
Ensure that the remote
modem supports the
modem rates you
anticipate.
Line quality is not sufficient to
support higher data rate. If line
quality improves, the modem
increases its speed
automatically.
Modem retrains
occur frequently
Retry call. A line problem is indicated.
Reduce the transmit rate
(AT
*
MX); if excessive retrains
continue, contact telephone
company.
CALL TERMINATION
Modem takes
too long to
disconnect
Check whether remote
modem supports PSTN
cleardown.
If remote modem doesn't
support PSTN cleardown, set
local modem to Longspace
Disconnect (ATY1).
Table 5-1. Troubleshooting the 3460 Fast’R Modem
Problem Diagnosis/Test Possible Solution