Lucent Technologies 7820-0802-003 manual Looping back the line

Configuring DS3-ATM Cards

Examples of DS3-ATM configurations

Looping back the line

To diagnose possible line problems, you can loop back the DS3-ATM interface by using the Loopback parameter in the line profile. While the interface is looped back, normal data traffic is interrupted. The Loopback parameter in the DS3-ATM profile supports the following settings:

•No-Loopback. The default, specifies that the line is operating normally.

•Facility-Loopback. During a facility loopback, the card returns the signal it receives on the line. The remote end receives back the signal it transmitted.

•Local-Loopback. During a local loopback, the receive path is connected to the transmit path at the DS3 multiplexer, enabling the slot card to receive what it transmitted.

For example, the following commands activate a local loopback:

admin> read ds3-atm {1 3 1} DS3-ATM/{ shelf-1 slot-3 1 } read

admin> set line loopback= local-loopback

admin> write

DS3-ATM/{ shelf-1 slot-3 1 } written

To end the loopback, set the Loopback parameter to No-Loopback. For example:

admin> set line loopback = no-loopback

admin> write

DS3-ATM/{ shelf-1 slot-3 1 } written

For more details about checking line status and performing line checks, see the APX 8000/MAX TNT/DSLTNT Administration Guide.

14-4 APX 8000/MAX TNT/DSLTNT Physical Interface Configuration Guide