150-402-102-01, Revision 01
Appendix A: Additional Technical Information
HRU-402 List 2
July 27, 1998
47
Alarm Pattern Option (ALMP) Option
To further improve HiGain’s compatability with the switch-to-protect
features used in DLC feeder applications, the line unit has an ALMP which
allows the user to select either AIS or LOS T1 output payloads for the
following alarms:
•
LOSW on any loop (output the selected alarm pattern at both ends)
•
T1 LOS (output the selected alarm pattern at the upstream end)
•
Margin alarm if HAIS=1L (output the selected alarm pattern at both
ends)
DS1 Line Code Auto Option
When the DS1 line code option is set to AUTO mode, both the HLU and
HRU-402 List 2 set their T1 output codes to the codes reserved at the opposite
end of the T1 input. AUTO mode forces the input and the output codes in each
direction of transmission to be identical. In the AUTO mode of older HiGain
units, the DS1 output code was determined by the input code at the local T1
input port instead of at the distant end.
If the HRU-402 List 2 is connected to an older HLU, its DS1 AUTO mode
performs as it does in older models where its output code is set by its input
code.
When the HRU-402 List 2 is connected to older HLUs that do
not support these options, the options are forced to their
following default states:
•
BPVT: DIS
•
RDA: ENA
•
BER: None
•
ALMP: AIS.
