8-6

 

CHAPTER 8: TROUBLESHOOTING

 

 

 

 

Table 8-1 Symptoms, Causes, and Solutions

 

 

 

 

 

 

Symptom

 

Possible Cause

Solution

 

 

 

 

A connection has

There is an interoperability

Make sure that the local and remote

been established

mismatch between the local

data applications have

(B-1 or B-2 green

and remote applications.

communications capability and are

LED remains lit

 

properly configured.

and you receive a

 

 

CONNECT

 

 

Ensure that the baud rates for each

message) but data

 

cannot be sent

 

application are set to an equal value.

Upon power up,

A previous firmware

Download the firmware. Refer to the

both the TEST and

download did not complete

readme file for firmware download

D channel LEDs

successfully.

instructions.

flash

 

 

 

Both B1 and B2

The 3C882 ISDN modem baud

LEDs flash when

rate is set to 230.4 Kbps. or to

the D channel

a fixed rate (i.e., Autobaud is

lights

disabled).

Ensure that your computer’s COM port supports 230.4 Kbps or change the COM port setting of either your computer or the ISDN modem so that both devices are set to the same COM port rate.

Cannot place or

Your ISDN line has not been

receive two

provisioned for simultaneous

simultaneous calls

voice and data.

DTR LED does not

Communication between the

remain lit after you

ISDN modem and your PC has

have started your

not been successfully

communication

established.

application

 

(Continued)

Check your ISDN line provisioning. Ensure that simultaneous voice and data has been provisioned for both directory numbers.

Verify that the 3C882 ISDN modem is powered on.

Verify that the COM port cable is firmly connected to the COM port on your PC and the COM port on the 3C882 ISDN modem.

Verify that the correct COM port (the one to which the 3C882 ISDN modem is connected) is selected in your communications application.