Section 150-388-124
Revision 01
Page 9
TABLE 1. HLU-388, LIST 2D SYSTEM OPTIONS (CONTINUED)
Mode
Selection
Description
DS1
AUTO
The HLU-388, List 2D and HRU-412 independently monitor their incoming T1 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-388, List 2D and HRU-412 into their B8ZS modes.
AMI*
Places both the HLU-388, List 2D and 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-388, List 2D and
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-388, List 2D and
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 Lists 6 and 7, HRU-412 to transmit the AIS signal toward the Customer
Interface (CI) when in NREM or Smart-Jack loopback (see Figure 6).
DIS
Causes the List 6, HRU-412 to transmit the signal from the network toward the CI when an
HRU NREM or Smart-Jack loopback is executed. The AIS signal is off.
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 from being updated. They
remain as they were before the system options 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 (see Figures 10 and 22 for non-doubler and doubler screens, respectively). It
determines the minimum allowable margin below which a minor alarm can occur. Note
that setting the threshold to “0” inhibits the margin alarm.
4 dB*
(Default value)
DS0
BLK
The DS0 blocking option can only be set via the RS-232 maintenance port with a terminal
(see Figures 10 and 22 for non-doubler and doubler screens, respectively). The
4-character HLU-388, List 2D front panel LED readout only displays the status of the
blocking option. BLK indicates at least one channel is blocked.
NONE*
“None” indicates no channels are blocked.
