150-431-115-01, Revision 01
Maintenance
HLU-431 List 1E
September 22, 1998
25
Loopback Timeout
LBTO
NONE
Disables automatic time-out cancellation of all loopbacks.
20
Sets automatic cancellation of all loopbacks to 20 minutes after initiation.
60*
Sets automatic cancellation of all loopbacks to 60 minutes after initiation.
120
Sets automatic cancellation of all loopbacks to 120 minutes after initiation.
Alarm
ALM
DIS*
Opens the system alarm relay contacts if closed, and disables activation of the
system alarm relay when a system alarm condition occurs.
ENA
Enables activation of the system alarm relay when a system alarm condition
occurs.
DSX-1 Line Code
DS1
AUTO
The HLU-431 and HRU monitors the incoming HRU T1 bit streams for the
Bipolar with 8-zero Substitution (B8ZS) pattern. If the HRU detects this
pattern, the HLU enters its B8ZS mode. It reverts back to its Alternate Mark
Inversion (AMI) output mode if no B8ZS patterns are received at the HRU
input for five seconds. The HLUs T1 input can detect either AMI or B8ZS when
in the AUTO mode.
B8ZS
Places both the HLU-431 and HRU into their B8ZS modes.
AMI*
Places both the HLU-431 and HRU into their AMI modes.
Framing
FRMG
AUTO*
Configures the HiGain system to operate in an auto-framing (AUTO) mode in
which it continuously searches the input T1 bit stream for a valid SF or ESF
frame pattern. This feature is required for fractional T1 applications (DS0
blocking) where it insures proper channel time slot alignment. While the
HiGain system can also process unframed data in this AUTO mode, it is
recommended that the unframed (UNFR) mode be used for all unframed
applications. Using the AUTO mode for unframed applications runs the risk of
detecting “pseudo-valid” frame sequences, which can affect the data integrity.
UNFR
Configures the HiGain system to operate in an unframed mode. This mode
disables the auto framing process and forces the HiGain system to function as
a transparent bit pipe.
AIS On HDSL LOSW
HAIS
2LP*
Causes the HiGain system to transmit the AIS signal at both the HLU-431 and
HRU T1 output ports when both of the HDSL loops are not in sync (LOSW).
1LP
Causes the HiGain system to transmit the AIS signal at both the HLU-431 and
HRU T1 output ports when either of the two HDSL loops is not in sync (LOSW)
or if a Margin alarm occurs.
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
Table 9.
HLU-431 List 1E System Settings Screen Options (Cont.)
System Settings
Screen Options
Front Panel
Display
Code
Selection
Description
*Indicates factory default settings.
