150-231-175-01, Revision 01
Maintenance
HLU-231 List 7E
September 23, 1998
25
L
OOPBACK
M
ENU
The Loopback Menu permits you to issue loopbacks to the HiGain system. There are three possible Loopback
Menus:
•
Loopback Menu: No doubler
•
Loopback Menu: One doubler
•
Loopback Menu: Two doublers
In all instances, press
from the Maintenance Terminal Main Menu to display the Loopback Menu.
shows an example of a Loopback Menu when no doublers are present;
doublers are present.
AIS On SMJK/NREM
SAIS
ENA*
Causes the HRU to transmit the AIS signal towards the Customer Interface
(CI) when in NREM or SmartJack loopback (see Figure 5).
DIS
Causes the HRU to either transmit the signal from the network towards the CI
RCU port or to open and terminate its RCV CI port when an HRU NREM or
SmartJack loopback is executed. The AIS signal is not sent (towards the CI).
Margin Alarm
Threshold
MARG
0 to 15 dB
The Margin Alarm Threshold can only be set via the RS-232 Craft port with a
terminal. It determines the minimum allowable margin below which a system
alarm can occur. Zero disables the alarm.
4dB*
Default value
DSO Blocking
DS0
BLK
The DS0 blocking option can only be set via the RS-232 Craft port with a
terminal. The four-Character Line Unit front panel only displays the status of
the blocking option. BLK indicates at least one channel is blocked.
NONE*
Indicates no channels are blocked.
Table 9.
HLU-231 List 7E System Settings Screen Options (Cont.)
System Settings
Screen Options
Front Panel
Display
Code
Selection
Description
*Indicates factory default settings.
