Niu Query Command - ADC HiGain HRU-402 Manual

Appendix A - Specifications
NIU Q
UERY
Upon receipt of the 16-bit NIU query command while in loopback mode, the
HRU responds by utilizing logic inversion for conveying information on top
of the command signal. The number of logic inversions indicate which mode
is being queried. The command is declared valid after receipt of the pattern
for 5 seconds. The response (logic inversions) are sent within 20 seconds after
the command. If the command is still present, the response repeats every 15
seconds.
The 16-bit framed SF or ESF inband pattern is model-specific and is D5D5
or D5DA (hexadecimal).
Monitored seconds are not incremented while in loopback. PM data and
sectionalized events are not collected during or as a result of loopback.
Table 11 lists some of the model-specific query commands.
Table 11. Model-specific NIU Query Commands
Model
ADC HRU-402 List 4
ADC HRU-412 List 9B
ADA 2011 List 2
ADA 2011 List 3
ADA 2011 List x
ADA 2021 List x
Teltrend
36
C
OMMAND
Inband Pattern
(hexadecimal)
D5D5, D5DA
D5D5
D5D5
D5D5
D5D5
D5DA
D5D5
January 3, 2001
LTPH-TP-1024-02, Issue 2
Logic Inversion
20
20
220
300
270 + model number 0
330 + model number 0
570
HRU-402 List 4