Motorola 3460 Fast’R User Manual page 95

Table 5-1. Troubleshooting the 3460 Fast'R Modem
Problem
Modem stops
passing data
The modem
connects at a
lower rate than
Max Rate
(AT MX)
*
option.
Modem retrains
occur frequently
CALL TERMINATION
Modem takes
too long to
disconnect
3460 Fast'R
Diagnosis/Test
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.
Modem could be in
"flow off" condition
(modem set for XON-
XOFF and computer
set for hardware flow
control).
Check CQMS
parameters with
Fast'RVu.
Ensure that the remote
modem supports the
modem rates you
anticipate.
Retry call.
Check whether remote
modem supports PSTN
cleardown.
Possible Solution
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).
Set the modem for hardware
flow control (AT FL3).
*
Line quality is not sufficient to
support higher data rate. If line
quality improves, the modem
increases its speed
automatically.
A line problem is indicated.
Reduce the transmit rate
(AT MX); if excessive retrains
*
continue, contact telephone
company.
If remote modem doesn't
support PSTN cleardown, set
local modem to Longspace
Disconnect (ATY1).
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