
Configuring WAN Line Services
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If your ISDN service provider offers only 2B + D service, the FLOATINGB
option enables you to use only one B channel for dial service applications.
Floating B is an alternative if you cannot purchase 1B + D service.
Select FLOATINGB to use only one B Channel of ISDN, which becomes
BCHANNEL1 or BCHANNEL2 depending on the call setup procedures.
COM1 and COM2 become available in this mode.
Configure the B Channel on an AN or ANH ISDN interface.
Setting the IFTF Pattern
The router transmits an interframe time fill (IFTF) pattern when there is no data to
transmit on a synchronous line. There are two IFTF patterns:
• HDLC Flags, an 0x7E pattern (0 1 1 1 1 1 1 0)
• Idles, an 0xFF pattern (1 1 1 1 1 1 1 1)
HDLC Flags is the default IFTF pattern for all synchronous media types except
ISDN BRI. For ISDN BRI, the default pattern is Idles. To use these defaults, leave
the Force IFTF parameter set to Default. Or, you can override the defaults by
setting this parameter to Force Flags or Force Idles.
For a dial-on-demand interface, set the Force IFTF parameter to Force Idles.
Configuring Asynchronous Services
The implementation of asynchronous services differs among Bay Networks
routers. On Octal Sync link modules, all synchronous net modules, and BayStack
router COM ports, you can configure asynchronous communication from the Edit
Sync Parameters window by
• Setting the WAN Serial Interface Type
• Setting the Asynchronous Baud Rate
Site Manager: Sync B Channel Override parameter: page A-56
Site Manager: Sync Force IFTF parameter: page A-56
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