350-200-115-02, Issue 2
Overview
HLU-200 List 1E
September 25, 1998
3
Table 1.
Front Panel Features and STATUS LED States
Name
Function
Status Indicators
Indicates loopback, HDSL, and error status, as described below.
LOOP Lights green when a loopback is in effect.
FAIL Controlled by the channel bank. The LED remains on at all times
when the HLU-200 is used with revision 7.1.1 banks due to a
software flaw in 7.1.1 When used with revision 7.1.2 or higher,
it lights when the HLU-200 is first plugged into the bank and
remains on until the bank finishes its program download and
handshakes with the HLU-200 line unit. During normal
operation, it lights when there is a failure that affects service
within the bank.
HDSL Tri-colored LED:
flashes green during HDSL sync acquisition on either HDSL
loop.
flashes red for any of the alarm conditions.
lights steady green when both HDSL loops are in sync and no
minor alarms exist.
lights steady red if the on-board 48 V fuse opens.
RS-232 Craft port
Provides asynchronous access to the menu interface for system
maintenance, provisioning, and performance monitoring
firmware. Access is through a maintenance terminal or a PC with
terminal emulation software connected to this 9-pin DB-9 female
connector. The port is configured as DCE at 9600 baud, with 8
data bits, 1 stop bit, and no parity.
Retaining latch
Secures the HLU-200 into place.
