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Loopback Operation
L
OOPBACK
I
M
NITIATING
ANUAL
A manual loopback session allows you to select one of four HiGain system loopbacks.
Any of the HiGain loopbacks can be executed using the MODE and SEL buttons.
In general, to execute a manual loopback session using the MODE and SEL buttons:
•
The next loopback option can be presented by pressing the MODE button, but the
previously executed loopback remains active until the SEL button is pressed and a
different loopback is activated.
•
If neither button is pressed for a period of 30 seconds, and no loopback is in effect, the
manual loopback session terminates and the normal margin displays reappear.
•
If any loopback is in effect, the 30-second timeout is inhibited. The active loopback and
the manual loopback session continue until the loopback times out in accordance with the
LBTO setting.
•
Pressing both buttons for 3 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
followed by the message:
NLO?
2
Do one of the following:
•
To execute an E1 loopback, press the SEL button. The message changes from NLO? to NLOC.
•
To execute an NREM loopback:
–
Press the MODE button. The message changes from NLO? to NRE?
–
Press the SEL button to execute the NREM loopback.
3
To execute a CRE loopback, press the MODE button again.
4
To execute a CLO loopback, press the MODE button a third time.
These same loopbacks can be initiated from the RS-232 craft port by choosing the Loopback Mode, option D,
from the Main Menu. This displays the Loopback Menu
can be initiated or terminated.
All loopbacks can be initiated by a command from HiGain itself (front panel buttons or maintenance
screen selections).
42
O
PERATION
L
S
OOPBACK
January 26, 2000
ESSIONS
(Figure 13 on page
30) from which any of the loopbacks
150-319-205-05, Issue 5
ELU-319 List 5E and List 6E
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