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LTPH-UM-1031-03, Issue 3 Testing
H4TU-C-319 List 1 September 12, 2003 45
Remote LOS and AIS Response
Figure 27 shows the different ways the H4TU-R can respond to the network, depending on the configuration of
the NLBP, TLOS, RDA, and ALMP configuration options described in Table 5 on page 19 and Table 6 on
page 20.
Figure 27. H4TU-R LOS and AIS Response Priorities
OCT55 TEST PATTERN WITH AMI LINE CODE
The OCT 55 test pattern can be used in unframed mode to stress the system and verify data integrity. In an SF or
ESF framing mode, excessive zero anomalies may occur, which causes the H4TU-C to report ES, SES, and UAS
errors according to ANSI T1.231-1997.
LOS event?
AIS event?
Remove alarm
pattern
TLOS
RDA
NLBP
ALMP
DIS
ENA
ENA
DIS
AIS
AIS
LOS
LOS
YES
YES
NO
NO
Default configurations are in bold.
Loopback to Network
AIS to CPE
LOS to CPE
Pass on LOS to
Network, no alarm
report
Pass on LOS to
Network
AIS to Network
Standard Option
ADC Option
H4TU-R, DS1 Input