ZyXEL Communications omni.net LCD+M User Manual

 

8-4

Some switches transmit all network signals through the D-channel (out-of-band signaling), allowing both 
B-channels to be used exclusively for your communication purposes. This allows for throughput of 64Kbps per 
channel. However, not all switches support out-of-band signaling at this time. For switches that do not support 
out-of-band signaling, network signals are transmitted through the B-channels. This reduces the bandwidth to 
56Kbps. 

When you are making a V.120 call, make sure that the communication supports out-of-band signaling. If it 
does not support out-of-band signaling, you will need to set your omni.net to 56K mode using the [AT&E1] 
command ([AT&E0] to set it back to 64k mode.) If your ISDN TA is on the receiving end, you can keep the 
setting at AT&E0, 64k data mode. The omni.net will automatically switch between the two speeds in answer 
mode. 

Select V.120 for communication. 

OK

Select 64K data mode. 

OK

Select 56K data mode. 

OK

Now you are ready to dial the phone number. If you need to save the setting into non-volatile RAM, issue the 
following commands: 

Save the settings to profile 0 

[Profiles available: 0-3] 

OK

Save stored settings as the power on 
settings to profile 0. [Profiles available: 
0-3] 

OK

All the above commands can be simplified by combining all of the commands onto one line as follows:  
& 

AT&B20&E1&WZ0<Enter>

 

Finally, use the [ATDIn] command to make the call ('n' is the phone number you wish to dial). Once the 
connection is made, you should see the following connect message. 

CONNECT 115200/V120 56000/LAPD

This indicates that the connection is made with: 

) 

DTE speed of 115,200bps. 

) 

V.120 Protocol 

) 

Data Speed of 56,000bps. 

) 

Error Control LAPD. 

Table 45. V.120 Outgoing Protocol