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326X Series Modem Troubleshooting Guide (Continued)
Problem
Diagnosis/Test
If operating the 326X Series Modem on a leased line, and you experience this type of problem...
Modem won't connect
Check leased line cable for
conformance to 2- or 4-wire
NOTE: CQMS parame-
pinouts (U.S./Canada only).
ters are only valid once
the modems are
connected (in data
mode)
Ensure one modem is set for
answer and one for originate.
Ensure modem is set to match
line type (2- or 4-wire).
If you are still experiencing
problems, run an LAL pattern
test on both modems.
Check the modulation
configuration:
Check the leased line transmit
level option in both the local and
remote modems (LL TX Level,
TELCO OPTS).
• Mode (AT
*
CA)
• Max Rate (AT
*
MX)
*
• Min Rate (AT
MN)
Possible Solution
• For a 3261 2-wire leased line cable, pinouts should
be Pin 1 (ring) and Pin 2 (tip)
• For a 3261 4-wire leased line cable, pinouts should
be:
— Pins 1 (TX Ring) and 2 (TX Tip)
— Pins 7 (RX Tip) and 8 (RX Ring)
For pinouts for your country and model, refer to
Appendix C.
• Confirm the Tx and Rx connections for your leased
line jack.
• If errors are found on either end, contact Motorola
Customer Support.
• If the LAL pattern test passes, you may have line
problems; contact your telephone company.
Ensure the local and remote modem's modulation modes
are compatible with the maximum and minimum rate
options.
If this setting is adjustable in your country, adjust trans-
mit level to approximately -15 dB.
Troubleshooting Guide 6-9
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