Telenetics V.34-SDC - Manual (Page 113)

Troubleshooting Guide 6-9
T
roub
leshooting
If operating the 326X Series Modem on a leased line, and you experience this type of problem...
Modem won't connect
NOTE: CQMS
parameters are only
valid once the modems
are connected (in data
mode)
Check leased line cable for
conformance to 2- or 4-wire
pinouts (U.S./Canada only). • 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.
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. • If errors are found on either end, contact Telenetics
Customer Support or your local distributor.
• If the LAL pattern test passes, you may have line
problems; contact your telephone company.
Check the modulation
configuration:
• Mode (AT * CA)
• Max Rate (AT * MX)
• Min Rate (AT * MN)
Ensure the local and remote modem’s modulation modes
are compatible with the maximum and minimum rate
options.
Check the leased line transmit
level option in both the local and
remote modems (LL TX Level,
TELCO OPTS). If this setting is adjustable in your country, adjust
transmit level to approximately -15 dB.
326X Series Modem Troubleshooting Guide (Continued)
Problem Diagnosis/Test Possible Solution