ADC higain h2tu-c-319 list 4e Manuale Utente
Testing
LTPH-UM-1049-02, Issue 2
58
January 9, 2002
H2TU-C-319 List 4E
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
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.
When a loopback times out, the display then returns to the normal display mode.
You can terminate loopbacks manually and exit the MAN LPBK mode by simultaneously pressing the MODE
and LBK pushbuttons for 3 or more seconds. If no loopback is active, the MAN LPBK mode automatically
terminates after 30 seconds.
and LBK pushbuttons for 3 or more seconds. If no loopback is active, the MAN LPBK mode automatically
terminates after 30 seconds.
All loopbacks can be initiated by in-band commands in the DS1 payload or by a command from the HiGain
HDSL2 system (front-panel pushbuttons or maintenance screen selections). Therefore, whenever a loopback is
active, the method by which it was activated is indicated in the loopback and status information (Monitor screen)
by the annotation HG (HiGain HDSL2) or PL (Payload) adjacent to the identified loopback. For example,
NREM-HG indicates that the loopback was initiated by the HiGain HDSL2 system.
HDSL2 system (front-panel pushbuttons or maintenance screen selections). Therefore, whenever a loopback is
active, the method by which it was activated is indicated in the loopback and status information (Monitor screen)
by the annotation HG (HiGain HDSL2) or PL (Payload) adjacent to the identified loopback. For example,
NREM-HG indicates that the loopback was initiated by the HiGain HDSL2 system.
A
CTIVATING
M
ANUAL
M
ETALLIC
T
EST
A
CCESS
A Metallic Test Access (MTA) test mode can be initiated with the front panel MODE and LBK pushbuttons in
the same way the manual loopbacks can be initiated. This choice is presented at the end of the MAN LPBK
sequence of choices.
the same way the manual loopbacks can be initiated. This choice is presented at the end of the MAN LPBK
sequence of choices.
To initiate a manual MTA 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:
appears on the front-panel display:
MAN LPBK NLO?
2
Press MODE to advance to the last choice in the following sequence:
•
CRE?
•
NRE?
•
CLO?
•
NLO?
•
MTA?
.
3
Press LBK to activate the MTA test mode. This terminates any active loopbacks.
4
Once selected, the display changes to
MAN MTA.
Once the MTA mode is selected and activated, the MTA mode remains active until it times out based on the LBTO
setting. When the MTA mode times out, the display then returns to the normal display mode.
setting. When the MTA mode times out, the display then returns to the normal display mode.
SMJK loopback commands are only activated by in-band commands.