Manual Loopback Session - ADC HiGain H2TU-C-388 User Manual

Testing

Manual Loopback Session

A manual loopback session allows you to select any one of the HiGain loopbacks listed in
with the 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.
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 (default setting)
•
120 minutes
Activating Manual Loopback Mode
With the exception of SmartJack, any of the HiGain loopbacks 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.
• 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 5 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:
• NRE? = NREM
•
CRE? = CREM
•
CLO? = CLOC
•
COL? = dual loopback at H2TU-C.
•
RUL? = dual loopback at H2TU-R.
42
"Setting Options through MODE and SEL" on page
June 6, 2000
152-388-100-02, Issue 2
Table 15 on page 40
9.
H2TU-C-388 List 1