3com 3031 Instruccion De Instalación
154
C
HAPTER
14: WAN I
NTERFACE
C
ONFIGURATION
Directly connected CT1/PRI interfaces on two routers must respectively work in line
clock (that is,
clock (that is,
slave
clock) mode and internal clock (that is,
master
) mode.
If the
CT1/PRI interface on a router is connected to a switch, the switch will be the DCE
device responsible for providing the clock and the CE1/PRI interface in this case
must work in the line clock (
device responsible for providing the clock and the CE1/PRI interface in this case
must work in the line clock (
slave
clock) mode.
Perform the following configuration in CT1/PRI interface view.
The clock on a CT1/PRI interface defaults to the
slave
clock.
Setting the frame format on the interface
CT1/PRI interfaces support two frame formats, that is, Super Frame (SF) and
Extended Super Frame (ESF). In SF format, multiple frames can share the same
framing information and signaling information, so that there are more significant
bits can be used for transmitting user data. In practice, a system should be tested
often. The application of ESF makes it possible to operate the normal services
while testing the system.
Extended Super Frame (ESF). In SF format, multiple frames can share the same
framing information and signaling information, so that there are more significant
bits can be used for transmitting user data. In practice, a system should be tested
often. The application of ESF makes it possible to operate the normal services
while testing the system.
Perform the following configuration in CT1 interface view.
The frame format on a CT1/PRI interface defaults to ESF.
Enabling/Disabling loopback
You may enable a CT1/PRI interface to make local loop or remote loop for the
purpose of testing some special functions.
purpose of testing some special functions.
Perform the following configuration in CT1 Interface view.
By default, CT1/PRI interfaces are disabled to perform loopback.
Displaying and
Debugging CT1/PRI
Interface Information
Perform the following configuration in any view to display the state of CT1/PRI
interfaces and the related information.
interfaces and the related information.
Table 188 Setting the line clock on the CT1/PRI interface
Operation
Command
Set the line clock on the CT1/PRI interface
clock { master | slave }
Restore the default line clock on the CT1/PRI interface
undo clock
Table 189 Setting the CT1/PRI frame format on the CT1/PRI interface
Operation
Command
Set frame format on the CT1/PRI interface
frame-format { sf | esf }
Restore the default frame format on the CT1/PRI
interface
interface
undo frame-format
Table 190 Enabling/Disabling the CT1/PRI interface to perform local loop/remote loop
Operation
Command
Enable the CT1/PRI interface to make local loop/remote
loop
loop
loopback { remote | local }
Disable the CT1/PRI interface to perform loopback
undo loopback