Nortel Networks meridian m3905 Manual Do Utilizador

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Asynchronous troubleshooting
 
 
Asynchronous troubleshooting
If data is sent in idle mode (when there is no active call), you can not use keypad 
dialing. You must stop sending the data from the DTE.
You must disconnect pin 22, if you are using an RS-232 cable to connect the MCA 
to an ADM3/5 terminal.
If you are changing the MCA from Synchronous to asynchronous, change the baud rate 
before you change the mode from synchronous to asynchronous.
Some terminals drop DTR with this mode change. If this happens, the display does not 
show RELEASED.
Before you select VLL you must program Auto Dial.
The receiving data module always adapts to the sending data parameters. The 
sending data module never adapts to the answering data module parameters.
Modem pooling
Synchronous mode does not support modem pooling.
Power failure
When there is an active call between two MCAs, a power failure on either side 
does not disconnect the call. The call connection remains until the power returns. 
The MCA always retains the previous data parameters. There is no resetting 
required in the case of power failure.
Troubleshooting symptoms and solutions 
Symptom
Solution
No response when you 
type <CR> or AT at the 
terminal.
1.
Dial 
¤°to make sure you are in terminal mode.
2.
Make sure your PC or terminal’s power is on and you are on-line.
3.
You need to connect a null modem cable between your MCA, if the 
equipment is not configured as Data Terminal Equipment.
4.
Make sure the MCA is receiving external power. Check the power 
cable, make sure the connection is secure and there is power.