Issue 1, Section 150-231-164
Revision 04
Page 7
TABLE 1. HLU-231 LIST 6D SYSTEM OPTIONS (CONTINUED)
Mode
Selection
Description
ALM
DIS*
Opens the minor alarm relay contacts if closed, and disables activation of the minor
alarm relay when a minor alarm condition occurs.
ENA
Enables activation of the minor alarm relay when a minor alarm condition occurs.
DS1
AUTO
The HLU-231 List 6D & HRU-412 independently monitor their incoming DS1 bit
streams for the Binary Eight Zero Substitution (B8ZS) pattern. If either unit detects
this pattern, it enters its B8ZS mode. It reverts back to its Alternate Mark Inversion
(AMI) mode if no B8ZS patterns are received for five seconds.
B8ZS
Places both the HLU-231 List 6D & HRU-412 into their B8ZS modes.
AMI*
Places both the HLU-231 List 6D & HRU-412 into their AMI modes.
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.
HAIS
2LP*
Causes the HiGain system to transmit the AIS signal at both the HLU-231 List 6D &
HRU-412 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-231 List 6D &
HRU-412 T1 output ports when either of the two HDSL loops is not in sync (LOSW) or
if a MARGin alarm occurs.
SAIS
ENA*
Causes the List 6 & 7 HRU-412 to transmit the AIS signal towards the Customer
Interface (CI) when in NREM or Smart-Jack loopback (see Figure 5).
DIS
Causes the List 6 HRU-412 to transmit the signal from the network towards the CI &
the List 7 HRU-412 to open & terminate its RCV CI port when an HRU NREM or
Smart-Jack loopback is executed. The AIS signal is disabled (towards the NI) and the
network signal is transmitted back to the network.
CONF
YES
Confirms that all twelve operating modes (listed above) are to be updated to their
current selections.
NO*
Prevents the most recently selected operating mode selections form being updated.
They remain as they were before the system option settings mode was entered.
MARG
0 to 15 dB
The Margin Alarm Threshold can only be set via the RS-232 maintenance port with a
terminal (Figure 9 (non-Doubler) and Figure 21 (Doubler)). It determines the minimum
allowable margin below which a minor alarm can occur.
4 dB*
(Default value)
Table continued on next page
