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LTPH-UM-1253-01
Table 2
lists the LED status and their functions. The H4TU-C reports the alarm type or loopback status on its front
panel.
LED and Status
DSL1
Flashing red once every second Loop 1 of the HDSL4 span connected to H4TU-C is in acquisition.
DSL2
Flashing red once every second Loop 2 of the HDSL4 span connected to H4TU-C is in acquisition.
DSX/DS1
ALM
ESF/SF
Flashing yellow once every second ESF frame formatting and frame error/CRC are present at the H4TU-C.
Flashing green once every second SF frame formatting and frame error are present at the H4TU-C.
B8ZS/AMI
Flashing yellow once every second B8ZS and excess zeros string are present at the H4TU-C.
Flashing grseen once every second AMI and BPV are present at the H4TU-C.
LBK
Flashing yellow once every second System is ARMed.
H4TU-C-231 List 5A
Table 2. LED Status and Functions
Function
Solid green Loop 1 of the HDSL4 span connected to H4TU-C has synchronized without error.
Solid red Loop 1 of the HDSL4 span connected to H4TU-C has detected HBER,
MARG alarm, or any Power Feed alarms.
Solid green Loop 2 of the HDSL4 span connected to H4TU-C has synchronized without error.
Solid red Loop 2 of the HDSL4 span connected to H4TU-C has detected HBER,
MARG alarm, or any Power Feed alarms.
Solid green DSX-1 signal at the H4TU-C is error-free.
Solid red LLOS, BPV, frame error, or CRC is detected at H4TU-C. (LED updates once every
second when error occurs.)
OFF DS1 signal is present at both the H4TU-R and H4TU-C.
Solid yellow RLOS is present at the H4TU-R.
Solid red LLOS is present at the H4TU-C.
OFF Unframed DSX-1 is present at the H4TU-C or no DSX-1 is detected at the H4TU-C.
Solid yellow ESF frame formatting is present at the H4TU-C.
Solid green SF frame formatting is present at the H4TU-C.
OFF No DSX-1 signal is present at the H4TU-C.
Solid yellow B8ZS is provisioned at the H4TU-C.
Solid green AMI is provisioned at the H4TU-C.
OFF H4TU-C is not ARMed or in loopback.
Solid yellow H4TU-C is in either NLOC or CREM (RLB).
October 15, 2003
Front Panel
5
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