Step Command Remarks
16. Configure the polling interval.
timer-hold seconds The default is 10 seconds.
17. Set the line idle-code.
idle-code { 7e | ff } The default is 0x7E.
18. (Optional.) Enable RTS signal
reverse.
reverse-rts
By default, RTS signal reverse is
disabled.
19. (Optional.) Set the intended
bandwidth for the
synchronous serial interface.
bandwidth bandwidth-value
By default, the expected
bandwidth (in kbps) is the interface
baud rate divided by 1000.
20. (Optional.) Restore the default
settings for the synchronous
serial interface.
default N/A
21. Bring up the synchronous
serial interface.
undo shutdown
By default, a synchronous serial
interface is up.
Displaying and maintaining serial interfaces
Execute display commands in any view and reset commands in user view.
Task Command
Display serial interface information.
display interface [ serial [ interface-number ] ] [ brief
[ description | down ] ]
Display information about asynchronous serial
interfaces.
display interface [ async [ interface-number ] ] [ brief
[ description | down ]
Clear statistics for serial interfaces. reset counters interface [ serial [ interface-number ] ]
Clear statistics for asynchronous serial interfaces.
reset counters interface [ async [ interface-number ] ]
Configuring an AM interface
The analog modem (AM) interface combines the functionality of the asynchronous serial interface and
analog modem. The AM interface supports most of the commands available on asynchronous serial
interfaces and modems. When you configure an AM interface, you can treat it as a special asynchronous
serial interface.
AM interfaces provide dial-in and dial-out services for analog dial-up users. The actual connect rates
depend on the network conditions, including the line quality and connection protocol.
The following are the maximum downstream and upstream rates that the AM interface can provide:
• If the peer (typically an ISP) uses a digital modem, the AM interface can use the V.90 Modem
standard to set up connections. The maximum downstream rate is 56 kbps and the maximum
upstream rate is 33.6 kbps.
• If the peer (typically a subscriber) uses an analog modem (or an AM interface), the AM interface
can use the V.34 Modem standard to set up connections. The maximum downstream and upstream
rates are both 33.6 kbps.
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