Digital Modem Installation Guide

74 Troubleshooting
CTA 500 dm On Line Guide P0873832 Issue 05
properties. Ensure ÒUse country and area codeÓ is deselected if
using MP with two dial out numbers.
The PC receives bad data after a data call connection.
¥ Make sure that the CTA 500dm and the remote device are set to
the same rate adaptation protocol. See ÒRate adaptation protocol
speciÞcationsÓ on page 80 for more information.
¥ The remote device may be conÞgured for synchronous
transmission. The CTA 500dm does not support synchronous
operation.
The CTA 500
dm loses data after a data call connection.
¥ Make sure that the CTA 500dm and PC ßow control methods
match. SeeÒFlow ControlÓ on page 57 for more information.
The CTA 500
dm hangs up during a data call.
¥ Check the setting of the DTR pin. See ÒDTR OperationÓ on
page 59 for more information.
Data calls are established but Internal applications time out.
¥ Check that the settings under TCP/IP properties match those of
your ISP.
Data calls are made using MP and the connected pop-up says
connected@128,000 bit/s but only one channel is active.
¥ Only one channel may be available at the destination (for
instance if the ISP is busy).
¥ Check that you are subscribing to an MP capable service.
¥ Only one channel is available in the outgoing line pool.
¥ You are active on a voice call. If the voice call ends, a 128 kbit/s
session will be established.