3Com MSR 30, MSR 50 manual Physical-mode, Phy-mru, Syntax physical-mode async sync

198CHAPTER 11: FUNDAMENTAL SERIAL INTERFACE CONFIGURATION COMMANDS

Example # Set the MTU of interface Serial 2/0 to 1,200 bytes.

<Sysname> system-view

[Sysname] interface serial 2/0

[Sysname-Serial1/0] mtu 1200

physical-mode

Syntax physical-mode { async sync }

View Serial interface view

Parameter async: Sets the synchronous/asynchronous serial interface to operate in asynchronous mode.

sync: Sets the synchronous/asynchronous serial interface to operate in synchronous mode.

Description Use the physical-modecommand to set the operating mode of the synchronous/asynchronous serial interface.

By default, synchronous/asynchronous serial interfaces are operating in synchronous mode.

Example # Set synchronous/asynchronous serial interface 2/0 to operate in asynchronous mode.

<Sysname> system-view

[Sysname] interface serial 2/0

[Sysname-Serial1/0] physical-mode async

phy-mru

Syntax phy-mru size

undo phy-mru

View Asynchronous serial interface view, AUX interface view

Parameter size: Maximum receive unit (MRU) to be set, in the range 4 to 1,700 (in bytes).

Description Use the phy-mrucommand to set the MRU for an asynchronous serial interface operating in flow mode.

Use the undo phy-mrucommand to restore the default.

By default, the MRU of an asynchronous serial interface is 1,700 bytes.

Note that these two commands only apply to interfaces operating in the asynchronous flow mode.