Technical Reference for ZyXEL omni.net series 

2-6

Follow the guidelines in the table below designed to assist you in configuring the ISDN parameters 

of your ZyXEL omni.net ISDN TA. 

Configuring ISDN Parameters 

ISDN Parameter 

Description 

Outgoing Protocol 
Control 

Sets the calling protocol for the your ZyXEL omni.net ISDN TA. The 
protocol selected should match the protocol in use by the device or 
network your ISDN TA is calling. Selections are 
[X.75/V.110/V.120/PPP]. 

Note: PPP is the most widely used protocol for Internet Access. 

Multilink 

Multiple Link 

$

 Check the selection box if you want to combine 2 x B-channels to 

increase the data transfer rate. This is called multilink. 

%

 Multiple Link with two independent B-Channels. 

STAC or V.42bis 
Compression 

You can enable or disable data compression by checking or 
unchecking the check box. 

Data Rate 

Click the 56Kbps or 64Kbps option button. 

Call Bumping 

Call Bumping configures your ISDN device to allow outgoing or 
incoming analog calls while a Multilink connection is established. 

If this box is checked when a handset is picked up on a POTS port, or 
an incoming analog call is detected, the B-channel associated with this 
call will disconnect from the ISDN data call and allow the analog call to 
proceed. 

Keep Connection Alive 

Keep Connection Alive sets a timer that will send a dummy PPP 
packet every 59 seconds to maintain the connection with the remote 
device. 

This is useful during long periods when there is no data transfer, but 
you do not wish to be automatically disconnected by the remote 
device.  

Note: Do not set this option if you are charged by time usage, as this 
can maintain the connection indefinitely until it is manually 
disconnected. 

Bandwidth-On- Demand 

Bandwidth-On-Demand settings are used to control the adding and 
removing of the 2nd link of a Multilink connection. 

Table 3. Configuring ISDN Parameters