Front Panel Leds; Table 4. Front Panel Leds - ADTRAN H2TU-C Installation And Maintenance Practice

On installation, the Litespan H2TU-C runs a series of self-tests. Once the self-tests are
complete, the status LEDs reflect the true state of the hardware.

Front Panel LEDs

The Litespan H2TU-C provides front panel LEDs to display status information.
the LEDs and status descriptions.
Label
DSL
STAT
Flashing Green
RLOS
HLOS
Flashing Red
HCRC
ARM/LBK
B8ZS
61221002L1-5F

Table 4. Front Panel LEDs

Status Description
Green HDSL2 SNR margin is optimum (6 dB or higher)
Yellow HDSL2 SNR margin is marginal (1 dB to 5 dB)
Red HDSL2 SNR margin is poor (0 dB)
Flashing HDSL2 pulse attenuation is > 30 dB
Off Indicates loss of power to H2TU-C
Green Normal operation; H2TU-C is in sync with the H2TU-R
Acquiring HDSL2 synchronization with H2TU-R
Red Failure indication; unable to start/load firmware
Off DS1 signal from the CPE is present at H2TU-R
Red DS1 signal from the CPE is absent at H2TU-R or framing does not
match
Off HDSL2 signal achieved
Red HDSL2 loss of synchronization
DC continuity fault detected on HDSL2 loop
Off No HDSL2 CRC errors within the last 30 minutes
Yellow Four or more HDSL2 CRC errors in the last 30 minutes
Red HDSL2 CRC errors are being detected
Off Module is not armed or in loopback state
Green Module is in active loopback
Yellow Module is armed but not in loopback
Off The line code is AMI
Green The line code is B8ZS
Installation
Table 4 lists
5