set wan hssi

set wan hssi

Syntax Description

Related Commands

set wan hssi

The set wan hssi loopback commands are used to send commands to the DCE (usually a CSU/DSU) on the current HSSI interface. The set wan hssi clock command sets whether the interface will use its own internal clock or obtain the clock from the DCE. This is a runtime parameter which means when the system is rebooted, the configuration will revert to the last saved values. These commands set interface-specific parameters and require the use of the interface command to determine which interface to configure.

First enter the following command. See the interface command for more information.

interface WAN slot:port

Then enter:

set wan hssi {loopback {localdte | localline | remote | remote off} |
clock {external | internal}}

Syntax Description

loopback localdte

This command issues a command over the HSSI interface instructing the DCE to loop back data from the DTE back to the DTE. This command is useful for testing the integrity of the HSSI line. Many CSU/DSU manufacturers will also refer to this as a Channel-side loopback. While the CSU/DSU is in this mode, a network administrator can verify that the connection between the local interface and the CSU/DSU is working properly by configuring the connection for PPP (see the PPP section) and seeing if the wan port goes into "magic loopback."

In most cases, magic loopback can be verified by performing a show statistics hssi command and then checking if the counters for input and output packets rise without any errors accumulating.

loopback localline

This command issues a command over the HSSI interface instructing the DCE to loop back data from the network port (usually a DS3 interface) back out the network port. This command is useful for testing the line from the local CSU/DSU to the remote device. Many CSU/DSU manufacturers will also refer to this as a Line-side loopback. While the CSU/DSU is in this mode, a network administrator can verify that the connection between the local CSU/DSU and the remote device is working properly by configuring the connection for PPP (see the PPP section) and seeing if the WAN port on the remote device goes into "magic loopback.

Magic loopback can be verified using the instructions in the set wan hssi loopback localdte command.

loopback remote

This command is very similar to the set wan hssi loopback localline command except that it's the remote CSU/DSU which will be put into a line-side loopback. Also, the result of the command will be that the local interface that you performed this function on will go into "magic loopback" if the network port is configured for PPP (see the PPP section). This command is useful for testing the line from the local device through to the remote CSU/DSU.

Magic loopback can be verified using the instructions in the set wan hssi loopback localdte command.

loopback remote off

This command disables all loopback commands.

clock {internal | external}

The internal option specifies that an internal 33 Mb clock is used. Internal clocking should only be used when testing between two back-to-back HSSI ports connected via a NULL-modem cable.

The external option specifies that the clock provided by the DCE is used. Always use external clocking when attached to a CSU/DSU. The default is external.

loopback localdte	This command issues a command over the HSSI interface instructing the DCE to loop back data from the DTE back to the DTE. This command is useful for testing the integrity of the HSSI line. Many CSU/DSU manufacturers will also refer to this as a Channel-side loopback. While the CSU/DSU is in this mode, a network administrator can verify that the connection between the local interface and the CSU/DSU is working properly by configuring the connection for PPP (see the PPP section) and seeing if the wan port goes into "magic loopback." In most cases, magic loopback can be verified by performing a show statistics hssi command and then checking if the counters for input and output packets rise without any errors accumulating.
loopback localline	This command issues a command over the HSSI interface instructing the DCE to loop back data from the network port (usually a DS3 interface) back out the network port. This command is useful for testing the line from the local CSU/DSU to the remote device. Many CSU/DSU manufacturers will also refer to this as a Line-side loopback. While the CSU/DSU is in this mode, a network administrator can verify that the connection between the local CSU/DSU and the remote device is working properly by configuring the connection for PPP (see the PPP section) and seeing if the WAN port on the remote device goes into "magic loopback. Magic loopback can be verified using the instructions in the set wan hssi loopback localdte command.
loopback remote	This command is very similar to the set wan hssi loopback localline command except that it's the remote CSU/DSU which will be put into a line-side loopback. Also, the result of the command will be that the local interface that you performed this function on will go into "magic loopback" if the network port is configured for PPP (see the PPP section). This command is useful for testing the line from the local device through to the remote CSU/DSU. Magic loopback can be verified using the instructions in the set wan hssi loopback localdte command.
loopback remote off	This command disables all loopback commands.
clock {internal \| external}	The internal option specifies that an internal 33 Mb clock is used. Internal clocking should only be used when testing between two back-to-back HSSI ports connected via a NULL-modem cable. The external option specifies that the clock provided by the DCE is used. Always use external clocking when attached to a CSU/DSU. The default is external.

Related Commands

Command Description

configure HSSI Interface

Configures HSSI parameters for an interface

configure PPP

Configures PPP parameters for an interface

interface

Sets current interface

show wan

Shows WAN port information

Command	Description
configure HSSI Interface	Configures HSSI parameters for an interface
configure PPP	Configures PPP parameters for an interface
interface	Sets current interface
show wan	Shows WAN port information

Table of Contents

set wan hssi

Syntax Description

Related Commands