Applications
150-419-100-03>
6
September 25, 1998
HRU-419 List 1
Table 3.
HRU-419 Front Panel Component Functions
Name
Function
LOS LEDs
Remote and Local Loss Of Signal (LOS).
REM LOS Displays remote (REM) LOS.
LOC LOS Displays local (LOC) LOS.
LB LEDs
Loopback to/from the NET (Network) and to/from the CI.
NET Displays NET loopback state.
CI Displays CI loopback state.
Loopback
(LB)
Activates the remote unit metallic loopback state by pressing the button for
five (5) seconds. The unit can be unlooped by either pressing the button
again for five seconds or through the standard loopdown coded messages.
CODE LEDs
Indications for line code options.
B8ZS Indicates that the DS1 line code option is set to Bidirectional 8-Zero
Substitution (B8ZS).
AMI Indicates that the user DS1 line code option is set to Alternate Mark
Inversion (AMI).
BPV Indicates that a Bipolar Violation (BPV) is received at the remote’s DS1
input.
FRM LEDs
Indications for framing patterns.
ESF Displays ESF framing.
SF Displays SF framing.
ERR Framing error.
HDSL LEDs
Display HDSL Loop 1 and Loop 2 conditions
LP1 (Loop 1)
OK Display synchronization state for HDSL Loop 1.
MAR Indicates that the Signal-to-Noise (S/N) margin has dropped below the
margin threshold value.
ES Indicates at least one HDSL Cyclic Redundancy Check (CRC) error is
detected from the upstream module.
LP2 (Loop 2)
OK Displays synchronization state for HDSL Loop 2.
MAR Indicates that the S/N margin has dropped below the margin threshold
value.
ES Indicates at least one HDSL CRC error is detected from the upstream
module.
RS-232 Craft
port
Provides bi-directional communication between the unit and an external
maintenance terminal through an RS-232 interface to allow configuration
and performance monitoring through the Maintenance Terminal menus.
