Product Overview
150-402-102-01, Revision 01
6
July 27, 1998
HRU-402 List 2
Table 2.
Front Panel Components
Name
Function
DS1 XMT and RCV
Bridging Jacks
Provides bridging test and monitor access jacks to the CPE DS1
interface. Provides both monitor and test access capability.
See
for circuit details.
Alarm (ALM) LED
Shows alarm states for Remote and Local Loss of Signal (LOS)
Solid Red Indicates a LOS condition at HRU T1 input.
Blinking Red Indicates a LOS condition at HLU T1 input.
Loopback (LBK) LED Shows loopback states to and from the NET (Network) and to and
from the Customer Interface (CI) and an ARMED condition.
Solid Yellow Indicates NREM
Blinking 1 Per
Second
Indicates CLOC loopback state.
Blinking 4 Per
Second
HRU is in an ARMED state.
LBK Control Button
Press the button for five seconds to activate a remote loopback
towards the Network Remote Loopback (NREM) state. The unit
can be unlooped by either pressing the button in again for five
seconds or by the standard loopdown coded messages.
Also provides the ability to control NREM.
(a)
DS1 Code LEDs
Indications for DS1 code options.
B8ZS DS1 Code Option=B8ZS: Solid green indicates that the DS1 line
code option is set to Bit 8-Zero substitution (B8ZS). The solid
green light does not indicate the actual DS1 line code being
received which may be Alternate Mark Inversion (AMI) or B8ZS.
The light blinks one time per second when a string of excessive
zeros is detected.
DS1 Code Option=Auto: Solid green indicates DS1 code being
detected at B8ZS.
AMI DS1 Code Option=AMI: Solid green indicates that the user DS1
line code option is set to AMI. This light blinks one time per
second when a Bipolar Violation (BPV) is detected.
DS1 Code Option=AMI: Solid green indicates the DS1 code is
being detected as AMI.
DS1 Framing (FRM)
LEDs
Indications for framing patterns.
Extended Super
Frame (ESF)
Solid green indicates ESF framing. The light blinks one time per
second when a frame error is indicated.
Super Frame
(SF)
Solid green indicates SF framing. The light blinks off for 0.5
seconds when a frame error is indicated.
(b)
