Section 350-231-164
Revision 01
10
HLU-231 List 6D
DS0
BLK
The DS0 blocking option can only be set through the Craft
port with a terminal. The 4-character HLU-231 List 6
D
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.
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 Superframe or Extended Superframe
pattern. This feature is required for fractional T1 applica-
tions (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 Alarm Indication Signal
(AIS) signal at both the HLU and HRU T1 output ports
when both of the HDSL loops are not in sync (Loss of
Sync-Word).
1LP
Causes HiGain to transmit the AIS signal at both the HLU
and 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 HRU to transmit the AIS signal towards the
Customer Interface (CI) when in NREM loopback.
DIS
Prevents the AIS signal from being transmitted to the net-
work interface and replaces it with the network test signal
or by a quiet termination (Loss of Signal) depending on the
list number of the HRU.
CONF
YES
Confirms that all 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 option settings mode was entered.
HLU-231 List 6D System Options (Continued)
Mode
Selection
Description
Summary of Contents for HLU-231
Page 20: ......
