Section 150-231-134
Revision 01
Page 12
TABLE 3. SYSTEM OPTION SETTINGS (CONTINUED)
Mode
Selection
Description
“LNCD”
B8ZS
Places both the HLU & HRU into their B8ZS modes.
AMI*
Places both the HLU & HRU into their AMI modes.
“FRMG”
AUTO
Configures HiGain 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
HiGain can also process unframed data in this AUTO mode, it is
recommended that the 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 HiGain to operate in an unframed mode. This mode disables
the auto framing process and forces HiGain to function as a transparent
bit pipe.
HAIS
2LP*
Causes HiGain to transmit the AIS signal at both the HLU & HRU T1
output ports when both of the HDSL loops are not in sync (LOSW).
1LP
Causes HiGain to transmit the AIS signal at both the HLU & HRU 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 and 7 HRU to transmit the AIS signal towards the NI
when in NREM or SMJK loopback.
DIS
Causes the List 6 HRU to transmit the signal from the network towards the
NI and the List 7 to open and terminate its NI when in its NREM or SMJK
loopback states. The AIS signal is turned off.
CONF
YES
Confirms that all nine operating modes are to be updated to their current
choices.
NO*
Prevents the most recently selected operating mode choices form being
updated. They remain as they were before the system option settings
procedure was entered.
MARgin Alrm
Trsh
0 to 15 dB
(4*)
The Margin Alarm Threshold can only be set via the RS-232 maintenance
port. It determines the minimum allowable margin below which a minor
alarm will occur.
DS0
BLK/NONE*
The DS0 blocking option can only be set via the RS-232 maintenance port
with a dumb terminal. See Figure 13. The 4-character HLU front panel
only displays the status of the blocking option. NONE indicates no
channels are blocked. BLK indicates at least one channel is blocked
“xxxx”
Panel Set
Only these options can be set from the front panel buttons. All of the
options can only be set from the RS-232 maintenance port.
* Indicates HLU-231 factory settings. HiGain can be set to these default settings by pressing the SEL button for
6 seconds and then selecting the YES response to the resulting DFLT message.
