Manual Loopback Session; Setting The Loopback Time-Out Option; Activating Manual Loopback Mode - ADC HiGain H2TU-C-231 List 3F User Manual

Testing
M L
ANUAL OOPBACK
A manual loopback session allows for any HDSL2 loopback selection as listed in
exception of 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.
Table 5 on page 16 describes this option.
1 Log on to the maintenance terminal.
2 Select Config, Standard Options, then LBTO.
3 Verify the LBTO setting.

Activating Manual Loopback Mode

With the exception of SmartJack, any of the HDSL2 loopbacks can be executed using the MODE
and LBK pushbuttons.
When executing a manual loopback session using the MODE and LBK pushbuttons:
• The next loopback option can be displayed by pressing the MODE pushbutton, however, the
previously activated loopback remains active until the LBK pushbutton is pressed, which
activates the new loopback.
• If neither pushbutton 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 sessions continue until the loopback times out in accordance with the
LBTO setting.
• If there is an active loopback, pressing the MODE and LBK pushbuttons for 5 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 LBK pushbuttons on the front panel for at least 3 seconds. The following message
appears on the front-panel display:
MAN LPBK NLO?
2 Press LBK to activate NLOC. The display changes to MAN LPBK NLOC.
3 Press MODE to advance to the next available loopback:
• NRE? = NREM
• CRE? = CREM
• CLO? = CLOC
• COL? = dual loopback at H2TU-C.
•
RUL? = dual loopback at H2TU-R.
4 Press LBK to activate the selected loopback. The previous loopback is terminated.
Once a loopback is selected and activated, the loopback stays active until it times out (based on the LBTO setting).
When a loopback times out, the display then returns to the normal display mode.
54
S
ESSION
June 12, 2002
LTPH-UM-1149-01
Table 22 on page 52 with the
H2TU-C-231 List 3F