Digi TransPort WR11, Руководство пользователя

Страница: 553 / 866

Configure legacy protocols Configure X.25 parameters
Digi TransPort WR Routers User Guide 553
X.25 LAPB parameters
LAPB (Link Access Procedure Balanced) is a standard subset of the High-Level Data Link Control
(HDLC) protocol. It is a bit-oriented, synchronous, link-layer protocol that provides data framing,
flow control and error detection and correction. LAPB is the link layer that X.25 applications use . On
Digi TransPort routers, you can use LAPB over ISDN or over a synchronous serial port.
Use: Serial port Port x (in Synchronous Mode)
To use the LAPB instance over a synchronous serial port enable this setting and select a serial
port number. To configure settings of the synchronous port such as speed and clock source
navigate to Configuration > Network > Interfaces > Serial > Serial Port n > Sync Port n.
Use: ISDN
Enable this setting to use LAPB over ISDN.
Mode DTE or DCE
Determines whether LAPB will behave as DTE (Data Terminal Equipment) or DCE (Data Circuit-
terminating Equipment) in an X.25 protocol sense. Physical DTE vs. DCE wiring cannot be
changed by configuration.
N400 Counter x
This is the standard LAPB retry counter. The default value is 3 and it should not normally need to
be changed.