Page no.
30
Communications cables
RJ Connector
QNA-412
Modem (DB9)
Modem (DB25)
1–DSR 5–GND
7–GND
2–Rx 2–Rx
3–Rx
3–TX 3–Tx
2–Tx
4–CTS 8–CTS
5–CTS
5–RTS 7–RTS
4–RTS
Front view
1
6
2 3 4 5
6–GND 5–GND
7–GND
Possible problems
The majority of problems that may be encountered with this configuration
are caused by the Modem.
Problem
Solution
Check that the computer port being used is the one
that is connected to the Modem.
Verify that the computer port and Modem port are
working properly using a Hyperterminal program or
similar.
Verify the Modem connections.
Modem A is not calling
Verify the telephone line and its connection.
Check that the modem is on.
Modem B is not responding.
Check that the command for the modem to answer
on the first ring has been made (ATS0=1).
Verify that the port being used is the R1 and that the
cable is connected.
Modem B answers but does
not receive a response from
the equipment.
Verify the QNA communications port setting. Verify
that it is 9600 bauds.
Operation has been checked to be correct for the following types of Modems:
VAYRIS, MULTITECH, WESTERMO and U.S. ROBOTICS
.
The local modem (A) cannot make a call via a telephone
switchboard. It must be a direct line.
