Manual Loopback Session - ADC HiGain H2TU-C-388 List 1E User Manual

152-388-115-03, Issue 03

Manual Loopback Session

A manual loopback session allows you to select any of the HiGain HDSL2 loopbacks listed in
except SmartJack loopbacks, which can only be issued by inband commands.
Setting the Loopback Time-out Option
Before initiating a loopback session, verify that the Loopback Time-out parameter is set to the desired setting.
1 Use the MODE and SEL buttons, as described in
The Loopback Time-out parameter is also user-selectable from the System Settings screen when using a
maintenance terminal.
2 Select the desired setting:
•
NONE (time-out disabled)
•
20 minutes
•
60 minutes
•
120 minutes (default setting)
Activating Manual Loopback Mode
With the exception of SmartJack, any HiGain HDSL2 loopback can be executed using the MODE
and SEL buttons.
When executing a manual loopback session using the MODE and SEL buttons:
• The next loopback option can be displayed by pressing the MODE button, however, the
previously activated loopback remains active until the SEL button is pressed, which
activates the new loopback.
• If neither button is pressed for a period of 30 seconds and no loopback is in effect, the
manual loopback session terminates and the display returns to normal mode.
• If any loopback is in effect, the 30-second time-out is inhibited. The active loopback and the
manual loopback session continue until the loopback times out in accordance with the LBTO
setting.
• Only the SMJK loopback can exist with other network loopbacks at any given time.
• If there is an active loopback, pressing the MODE and SEL buttons for 3 or more seconds
terminates any active loopback, ends the manual loopback session and returns the display
to normal mode.
To initiate a manual loopback session:
1 Press both the MODE and SEL buttons on the front panel for at least 3 seconds. The following message
appears on the front-panel display:
MAN LPBK NLO?
2 Press SEL to activate NLOC. The display changes to MAN LPBK NLOC.
3 Press MODE to advance to the next available loopback (CRE?, NRE?, CLO?, NR1?, CR1?, NR2?,
CR2?).
4 Press SEL to activate the selected loopback. The previous loopback is terminated.
Once a loopback is selected and activated, the loopback remains active until it times out, based on the LBTO
setting. When a loopback times out, the display then returns to the normal display mode.
H2TU-C-388 List 1E
"Setting Options through MODE and SEL" on page
April 21, 2000
Testing
Table 21 on page 47
11.
49