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Manual Loopback Session
A manual loopback session allows you to select any one of the HDSL4 loopbacks listed in Table 16 on page 51 with the exception of SmartJack loopbacks, which can only be issued by inband commands.
Setting the Loopback Time-Out Option (LBTO)
Before initiating a loopback session, verify that the Loopback
1Use the MODE and SEL pushbuttons as described in “Setting Options through MODE and SEL” on page 10.
(The loopback
2Select the desired setting:
•NONE
•20 minutes
•60 minutes
•120 minutes
•8 hr
•24 hr
Activating Manual Loopback Mode
With the exception of SmartJack, any of the HDSL4 loopbacks can be executed using the MODE and SEL pushbuttons.
When executing a manual loopback session using the MODE and SEL pushbuttons:
•The next loopback option can be displayed by pressing the MODE pushbutton, however, the previously activated loopback remains active until the SEL 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
•If there is an active loopback, pressing the MODE and SEL pushbuttons 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:
1Press both the MODE and SEL pushbuttons on the front panel for at least 3 seconds. The following message appears on the
MAN LPBK NLO? (XXXX indicates loopback choices)
2Press SEL to activate NLOC. The display changes to MAN LPBK NLOC.
3Press MODE to advance to the next available loopback:
•NDx? = Doubler 1 or Doubler 2, if H4D is available
•NRE? = NREM
•CRE? = CREM
48 | September 12, 2003 |
