Front Panel LTPH-UM-1031-03, Issue 3
4 September 12, 2003 H4TU-C-319 List 1
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.
List number Identifies the list number of the H4TU-C-319.
MODE and SEL pushbuttons Permits user options to be monitored and modified without the need of a maintenance terminal.
Used to initiate all HDSL4 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 HDSL4 acquisition or system alarm.
Yellow An H4TU-C-319 Customer Remote Loopback (CREM) or a Network Local Loopback (NLOC) is in
effect.
Flashing yellow H4TU-C-319 is in an Armed (ARM) state.
Card handle Provides the human-readable Common Language Equipment Identifier (CLEI) code number and
the Equipment Catalog Item (ECI) bar code number.
DSX-1 access jacks
BRG Provides non-intrusive bridging jack access to (IN) and from (OUT) the HDSL4 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 HDSL4 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.
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