3com 3031 Instruccion De Instalación
144
C
HAPTER
14: WAN I
NTERFACE
C
ONFIGURATION
The keepalive packet sending interval defaults to ten seconds.
CAUTION: If the link layer protocol applied to a serial interface is HDLC, the same
keepalive interval must be set on the devices at both ends of the link.
keepalive interval must be set on the devices at both ends of the link.
Configuring line idle-mark of synchronous serial interface
Perform the following configuration in serial interface view.
The line idle-mark of synchronous serial interfaces defaults to “7E”.
AM Interface
This section describes how to configure an AM interface.
AM Interface Overview
AM (Analog Modem) interface is similar to the combination of asynchronous serial
interface and analog modem in terms of the function. Most of the configuration
commands used on asynchronous serial interface and Modem can be directly used
on AM interface. AM interface can be treated as a special asynchronous serial
interface during its configuration.
interface and analog modem in terms of the function. Most of the configuration
commands used on asynchronous serial interface and Modem can be directly used
on AM interface. AM interface can be treated as a special asynchronous serial
interface during its configuration.
Theoretically, if the peer (it is always an ISP) uses a digital Modem, the AM
interface can establish connection with V.90 Modem standard, the downstream
rate can be up to 56 kbps, the upstream rate can be up to 33.6 kbps. If the peer (it
is always a common user) uses an analog Modem (including AM interface), the
AM interface can establish connection with V.34 Modem standard, both the
downstream and upstream rates are 33.6 kbps. But in practice, the rate of AM
interface is influenced by the line quality, program-controlled exchange and
connection standard. The rate cannot reach the theoretical value.
interface can establish connection with V.90 Modem standard, the downstream
rate can be up to 56 kbps, the upstream rate can be up to 33.6 kbps. If the peer (it
is always a common user) uses an analog Modem (including AM interface), the
AM interface can establish connection with V.34 Modem standard, both the
downstream and upstream rates are 33.6 kbps. But in practice, the rate of AM
interface is influenced by the line quality, program-controlled exchange and
connection standard. The rate cannot reach the theoretical value.
Configuring AM
Interface
Entering AM interface view
Perform the following task in system view.
Configuring AM interface
The configuration of AM interface is basically the same as that of asynchronous
serial interface and Modem.
serial interface and Modem.
Restore the interval for sending keepalive packets
undo timer hold
Table 167 Configuring line idle-mark of synchronous serial interface
Operation
Command
Set the line idle-mark of synchronous serial interface to
“FF”.
“FF”.
idle-mark
Restore the default line idle-mark, that is “7E”, of
synchronous serial interface
synchronous serial interface
undo idle-mark
Table 166 Configuring the interval for sending keepalive packets
Table 168 Entering the view of the specified AM interface
Operation
Command
Enter the view of the specified AM interface
interface analogmodem number