150-431-115-01, Revision 01
Overview
HLU-431 List 1E
September 22, 1998
5
Status LED
describes the functions of the Status LED on the front panel.
Table 2.
Front Panel Components and Labels
Front Panel Feature
Function
Front panel display
Displays four-character status, provisioning, and alarm system messages.
System option buttons
(MODE and SEL)
Permits the user options to be monitored and modified without the need of a maintenance
terminal. Used to initiate all HiGain loopbacks and to display DSX-1 line parameters and line unit
identity.
Status LED
See
for status descriptions.
DSX-1 access jacks
SPAN
Provides splitting jack access to (XMT) and from (RCV), the HDSL span at the DSX-1 interface.
Breaks the XMT and RCV paths to permit test signal insertion and retrieval.
BRIDGE
Provides non-intrusive bridging jack access to (XMT) and from (RCV) the HDSL span at the DSX-1
interface. Allows the two T1 payloads to be monitored.
Craft (RS-232) port
Provides bidirectional communication between the unit and an external terminal to allow
configuration and performance monitoring through the Maintenance Terminal screens.
CLEI/ECI bar code label
Provides the human-readable Common Language Equipment Identifier (CLEI) code number and
the Equipment Catalog Item (ECI) bar code number.
Configuration Number
The configuration number is a two or three-digit number that is either the last digits of a 5 or 6-digit
warranty control number or is a standalone number of two or three digits. For example, a warranty
control number of “80107” would indicate a warranty beginning in the year 1998 (8), during the
month of January (01), and the unit’s configuration number of 7 (07).
Table 3.
Status LED Descriptions
LED Status
Description
Green
Normal operation
Flashing green
HDSL acquisition
Red
Fuse Alarm
Flashing red
System alarm
Yellow
Self Test is in process or an HLU-431 List 1E Customer Remote
Loopback (CREM) or a Network Local Loopback (NLOC) is in effect.
Flashing yellow
HLU-431 is in an Armed state
