Table C. Led Alarms; Table D. Tl1 Alarm Conditions - ADTRAN AHT1U Installation & Maintenance

Indicator Description
LOOP .................... Illuminates when a loopback to the network is in progress.
FAIL ...................... Illuminates upon HTU-C powerup. Remains On until the HTU-C is successfully initialized.
The length of time to complete this procedure is dependent on activity of the terminal control processor in the common control
assembly of the Litespan system.
Illuminates when the module is unable to operate as required.
HDSL .................... Initially Off. Upon successful powerup of the HTU-C linecard, and when the 6811 microcontroller on the HTU-C releases the
reset line internal to the linecard, the HDSL LED will illuminate Red to indicate that HDSL loops are out of synchronization.
When HDSL loops are synchronized between the HTU-C and HTU-R or HRE, the HDSL LED will change from Red to Yellow
or turn Off. In HRE applications, loop synchronization must be on both sides of the HRE.
A Yellow HDSL LED indicates that HDSL loops are both in synchronization, but a Yellow or Red alarm exists at the DS1
interface at the HTU-R.
When the HDSL LED is Off, both HDSL loops are in synchronization and no red or yellow alarm conditions exist at the HTU-R
DS1 interface.
LP1 ........................ Indicates five possible states of the quality of the HDSL signals on Loop 1:
Off ..........No synchronization of HTU-C and HTU-R on Loop 1
Yellow ....Marginal signal qauality on Loop 1 (>2 dB margin above 10 -7 BER)
Green.....Good signal quality on Loop 1 (>2 dB margin above 10 -7 BER)
Blinking ..An error detected on either end of Loop 1 will cause this LED to blink briefly
LP2 ........................ Indicates five possible states of the quality of the HDSL signals on Loop 2
Off ..........No synchronization of HTU-C and HTU-R on Loop 2
Yellow ....Marginal signal quality on Loop 2 (<2 dB margin above 10 -7 BER)
Green.....Good signal quality on Loop 2 (>2 dB margin above 10 -7 BER)
Blinking ..An error detected on either end of Loop 2 will cause this LED to blink briefly
TL1 Alarm
AID,T1:MJ,LOS,SA ..........
AID,EQPT:MJ,UEQ,SA ....
AID,EQPT:MJ,MEA,SA ...
AID,EQPT:MJ,FAIL,SA ...
AID is the access identifier (i.e., cot-1-15).
61245002L6-5C

Table C. LED Alarms

Table D. TL1 Alarm Conditions

TL1 Alarm Description
The access identifier (CBA slot) has a major
service-affecting alarm because of a loss of sync
condition on the HDSL loops or loss of signal at
the HTU-R DS1.
The access identifier (CBA slot) has a major
service-affecting alarm because no channel unit is
installed in an equipped CBA slot.
The access identifier (CBA slot) has a major
service-affecting alarm because of equipment
type mismatch.
The access identifier (CBA slot) has a major
service-affecting equipment failure.
Section 61245002L6-5, Issue 3
Implications
There is an HDSL loss of sync in any HDSL leg, or
DS1 loss of signal at the HTU-R DS1 interface. The
HTU-C is in startup ,or a problem exists on the local
loop or customer interface.
No channel unit is installed in a slot which should
be equipped. The HTU-C is not inserted properly in
the correct slot, or the unit is defective.
The equipment installed in the channel bank slot
differs from the equipment type reserved in the
software record of the Litespan database. To clear
the alarm delete the equipment record (i.e.,
dlt-eqpt::cot-1-15 with TL1) and reinsert the card, or
equip the slot with the currently reserved equipment
type.
The Low Voltage Litespan HTU-C is unable to
operate normally or has failed a diagnostic test. See
subsection 10 of this practice.
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