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Overview
Front Panel Feature
Front panel display
System option buttons
(MODE and SEL)
Status LED
DSX-1 access jacks
SPAN
BRIDGE
Craft (RS-232) port
CLEI/ECI bar code label
Configuration Number
Status LED
Table 3
describes the functions of the Status LED on the front panel.
LED Status
Green
Flashing green
Red
Flashing red
Yellow
Flashing yellow
Front Panel Display
The front panel display is used with the MODE and SEL buttons to display system diagnostic messages. Refer to
Table 4
for a listing of the four character messages.
The front panel display turns on when power is initially applied to the HLU-231. To conserve power, the display
only remains on for 4 minutes. The use of the MODE or SEL buttons activates the front panel display and restarts
the 4-minute, power-control timer.
4
Table 2. Front Panel Components and Labels
Function
Displays four-character status, provisioning, and alarm system messages.
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.
See
Table 3
for status descriptions.
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.
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.
Provides bidirectional communication between the unit and an external terminal to allow
configuration and performance monitoring through the Maintenance Terminal screens.
Provides the human-readable Common Language Equipment Identifier (CLEI) code number and
the Equipment Catalog Item (ECI) bar code 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
Description
Normal operation
HDSL acquisition
Fuse Alarm
System alarm
Self Test is in process or an HLU-231 List 6E Customer Remote
Loopback (CREM) or a Network Local Loopback (NLOC) is in effect.
HLU-231 is in an Armed state
September 22, 1998
150-231-165-01, Revision 01
HLU-231 List 6E
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