
Configuring Synchronous Services
117021-A Rev. A 2-25
For all other synchronous link modules, these parameters are not available. Refer
to Chapter 3 for information about additional asynchronous services on BayStack
AN and ANH routers.
Setting the WAN Serial Interface Type
The serial interface is set for synchronous operation by default. Set this parameter
to Async to select asynchronous communication.
Setting the Asynchronous Baud Rate
With the WAN Serial Interface Type attribute set to Async, you can set the
transmission speed (in bits per second) between the router and the modem. You
control the baud rate for Asynchronous PPP using the Async Baud Rate
parameter.
Set this parameter to a value that is greater than or equal to the speed at which the
modem connects, but that is independent of that speed. For example, you set a
V.34 modem to its maximum modular connection speed of 28800 Kb/s or higher.
However, you could set the baud rate for a V.42 bis or MNP 5 data compression
modem with a high (4 to 1) compression ratio to 115200 baud.
By default, the asynchronous baud rate is 9600. Select a baud rate from 1200 to
115200 baud.
Editing LAPB Protocol Services
The Link Access Procedure-Balanced (LAPB) protocol is a version of the
High-Level Data Link Control (HDLC) protocol, which is an OSI link layer
standard. This section describes
• LAPB Implementation on Bay Networks Routers
• LAPB Parameters
Site Manager: WAN Serial Interface Type parameter: page A-57
Site Manager: Async Baud Rate parameter: page A-57
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