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122 CHAPTER 10: CONFIGURING WAN INTERFACE
Please use the following commands in the view of the asynchronous serial
interface.
Table 104 Enable or disable the level detection for the asynchronous serial interface
By default the level detection is enabled for the asynchronous serial interface.
12 Enable or disable internal loopback and external loopback
On performing special function test, the internal loopback and external loopback
is enabled for the asynchronous serial interface.
Please use following commands in the view of the asynchronous serial interface.
Table 105 Enable or disable internal loopback and external loopback for the
asynchronous serial interface
The internal loopback and external loopback are disabled by default.
13 Set MTU
MTU of asynchronous serial interface influences the fragmentation and
reassembling of IP network protocol message on this interface.
Please use the following commands in the view of the asynchronous serial
interface.
Table 106 Set MTU of asynchronous serial interface
The unit of mtu is byte, ranging from 128 to 1500, with 1500 as default.
14 Set the coding format of Modem
Please perform the following configurations in asynchronous serial interface
mode.
Table 107 Set the coding format of Modem
AUX Interface AUX interface is a fixed port provided by the 3Com Router. It can be used as a
common asynchronous serial interface with the highest rate of 115200bps. It can
also implement functions such as remote configuration of the router and line
backup.
Operation Command
Enable the level detection for the asynchronous serial
interface.
detect dsr-dtr
Disable the level detection for the asynchronous serial
interface.
undo detect dsr-dtr
Operation Command
Enable internal loopback and external loopback for
the asynchronous serial interface.
loopback
Disable internal loopback and external loopback for
the asynchronous serial interface.
undo loopback
Operation Command
Set MTU of asynchronous serial interface mtu size
Recover MTU default undo mtu
Operation Command
Set the coding format of Modem country-code area-name