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Front Panel LTPH-UM-1109-01, Issue 1
4 January 9, 2002 H2TU-C-231 List 2
Table 1. Front-Panel Description
Front-Panel Feature Function
Front-panel display Displays four-character status, provisioning, and alarm system messages. The front-panel
display illuminates when power is initially applied. To conserve power, the display only remains
on for 5 minutes. Using the MODE or SEL pushbuttons reactivates the display and restarts the
5-minute timer. Refer to Table 2 on page 5 for a listing of the four-character messages.
MODE and SEL pushbuttons Permits the user options to be monitored and modified without the need of a maintenance
terminal. Used to initiate all loopbacks and to display DSX-1 line parameters and line unit identity.
Status LED The status LED can report the following conditions:
Off Line power is off.
Green Normal operation.
Red Fuse alarm.
Flashing red HDSL2 acquisition or system alarm.
Yellow An H2TU-C-231 Customer Remote Loopback (CREM) or a Network Local Loopback (NLOC) is in
effect.
Flashing yellow H2TU-C-231 is in an Armed (ARM) state.
DSX-1 access jacks
BRG Provides non-intrusive bridging jack access to (IN) and from (OUT) the HDSL2 span at the DSX-1
interface. Allows the two DS1 payloads to be monitored.
LINE Provides splitting jack access to (IN) and from (OUT) the HDSL2 span at the DSX-1 interface.
Breaks the IN and OUT paths to permit test signal insertion and retrieval.
Craft port (RS-232) Provides bidirectional communication between the unit and an external terminal to allow
configuration and performance monitoring through the maintenance terminal screens.
CLEI and ECI bar code label Provides the human-readable Common Language Equipment Identifier (CLEI) code number and
the Equipment Catalog Item (ECI) bar code number.
List number Identifies the list number of the H2TU-C-231.
Retaining latch Retains the card in the shelf when pulled up and extracts the card from the shelf when pulled
down.