3com 3031 Instruccion De Instalación
DLSw Configuration
449
Perform the following command in synchronous serial port view.
By default, the NRZ coding scheme is adopted on the synchronous serial port.
Configuring the Idle
Coding Scheme of the
Synchronous Serial Port
The SDLC serial port of 3Com series routers is generally marked by “7E” in idle
time. Some SDLC devices, however, adopt full “1” high level working status. In
order to be better compatible to these devices, the idle coding scheme of the
routers needs to be changed.
time. Some SDLC devices, however, adopt full “1” high level working status. In
order to be better compatible to these devices, the idle coding scheme of the
routers needs to be changed.
Perform the following command in synchronous serial port view.
The idle coding scheme of the synchronous serial port commonly seldom needs to
be changed. Sometimes on connection with AS/400, this command needs to be
configured to change the idle coding scheme to quicken the AS/400 poll rate.
be changed. Sometimes on connection with AS/400, this command needs to be
configured to change the idle coding scheme to quicken the AS/400 poll rate.
Configuring the SDLC
Role
In contrast with the HDLC, the SDLC is a kind of link layer protocol in unbalanced
mode. That is, the statuses of the devices on the two connected ends are
opposite: one is primary and the other is secondary. The primary side, being the
primary station, whose role is primary, plays the dominant role and controls the
whole connection process. While the other side, being the secondary station,
whose role is secondary, receives control passively. Therefore, we need to
configure roles for the interfaces encapsulated with the SDLC protocol.
mode. That is, the statuses of the devices on the two connected ends are
opposite: one is primary and the other is secondary. The primary side, being the
primary station, whose role is primary, plays the dominant role and controls the
whole connection process. While the other side, being the secondary station,
whose role is secondary, receives control passively. Therefore, we need to
configure roles for the interfaces encapsulated with the SDLC protocol.
Perform the following command in synchronous serial port view.
On the SDLC role configuration, the roles should be decided by the status of the
SDLC device connected with the local router. If the SDLC device connected with
the local router is primary, the local interface is to be set secondary, and vice versa.
Normally, the central IBM mainframe is primary, while devices as UNIX hosts or
ATM (Auto Teller Machine) are secondary.
SDLC device connected with the local router. If the SDLC device connected with
the local router is primary, the local interface is to be set secondary, and vice versa.
Normally, the central IBM mainframe is primary, while devices as UNIX hosts or
ATM (Auto Teller Machine) are secondary.
By default, no role is set.
Table 519 Configuring the coding scheme of the synchronous serial port
Operation
Command
Configure the NRZI coding scheme of the synchronous serial port
code nrzi
Remove the NRZI coding scheme of the synchronous serial port
undo code
Table 520 Configuring the idle coding scheme of the synchronous serial port
Operation
Command
Configure the idle coding scheme of the synchronous serial port
idle-mark
Restore the default coding scheme of the synchronous serial port
undo idle-mark
Table 521 Configuring the SDLC role
Operation
Command
Configure the SDLC role
sdlc status { primary | secondary }
Remove the SDLC role
undo sdlc status{ primary | secondary }