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Revision 01 March 31, 1998 150-412-181-01
8 PairGain Engineering - Plant Series HRU-412 List 8A
Table 2. HRU-412 List 8A Front Panel Components
Name Function
Test points Allow the 60 mA CPE current option to be measured. The current flowing
is related to the voltage measured across the + and - test points by the
following relationship: CPE CURRENT = 1 MA/1 MV. Typical readings
range from 55 to 65 mV, which equate to a 55 to 65 mA current range.
Receive
(RCV) and
transmit
(XMT) jacks Provide splitting and monitor access to the CPE DS1 interface. The jacks
are transformer isolated from the CPE DS1 metallic interface.
Alarm LEDs REM LOS LED lights red to indicate a loss of signal (LOS) at the T1 input
to the HLU. This LOS condition causes the HRU-412 List 8A to transmit
the alarm indicating signal (AIS) pattern toward the CPE.
LOC LOS LED lights red to indicate a loss of signal (LOS) at the T1 input
to the HRU-412 List 8A. This LOS condition transmits the AIS pattern
toward the DSX-1 (TLOS Disabled) or to execute a logic loopback in the
HRU-412 List 8A (TLOS Enabled).
Loopback
(LB) LEDs NET LED lights green to indicate the HRU-412 List 8A is in a loopback state
where the signal from the network is looping back to the network.
CIS LED lights yellow to indicate the HRU-412 List 8A is in a loopback state
in which the signal from the customer interface (CI) is looping back to the
CI.
Code LEDs B8ZS LED lights green to indicate that the user DS1 code option is set to
B8ZS.
AMI LED lights yellow to indicate that the user DS1 code option is set to
AMI.
BPV LED lights red to indicate that the user DS1 code option is set to BPV.
If the user DS1 code option is set to AUTO, the lit LED indicates what DS1
signal is being received. Note that these settings are made on the HLU.
Framing
LEDs ESF LED lights green to indicate that the framing pattern of the received
signal is Extended Super Frame (ESF).
SF LED lights yellow to indicate that the framing pattern of the received
signal is Super Frame (SF).
ERR LED lights red to indicate that a DS1 frame error has occurred.
No frame LED lights when the HRU-412 List 8A input pattern is unframed
or when the framing option is set to UNFR (unframed). Note that this
settings is made on the HLU.