Section 150-612-102
Revision 03
Page 6
8. FRONT PANEL
8.01 DS1.
The top 60% of the front panel
addresses the following DS1 interface
features:
60 mA MON - These two test points
allow the 60 mA CPE current option, if
selected, 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.
RCV & XMT ACCESS JACKS - These
provide both splitting and monitor
access jacks to the CPE DS1 interface.
See Figure 2 for circuit details. Note
that these jacks are transformer isolated
from the CPE DS1 metallic interface.
•
ALM
REM LOS - RED LED that indicates a
Loss Of Signal at the T1 input to the
REMote (HLU) unit. This condition
causes the HRU to transmit the AIS
pattern to towards the CPE.
LOC LOS RED LED - that indicates a
Loss Of Signal at the T1 input to the
LOCal (HRU) unit. This condition
causes HiGain-2 to either transmit the
AIS pattern towards the DSX-1 or to
execute a logic loopback in the HRU as
a function of the TLOS user option
setting. See Paragraph 9.01 for details.
•
LB
NET - GREEN LED indicating the HRU
is in a loopback state in which the signal
from the NETwork is being looped back
to the NETwork.
CI - YELLOW LED indicating the HRU is
in a loopback state in which the signal
from the customer interface (CI) is being
looped back to the CI.
BUTTON - Depressing this front panel
button for 5 seconds forces the HRU
into its NREM metallic loopback state.
The unit can be unlooped by either
depressing the button again for 5
seconds or via the standard loopdown
coded messages
•
CODE
B8ZS - GREEN LED indicating that the
user DS1 code option is set to B8ZS. If
however the user DS1 code option is set
to AUTO, this LED indicates that the
code of the DS1 signal being received
at the HRU’s DS1 input is B8ZS.
AMI - YELLOW LED indicating that the
user DS1 code option is set to AMI. If
however the user DS1 code option is set
to AUTO, this LED indicates that the
code of the DS1 signal being received
at the HRU’s DS1 input is AMI.
BPV - RED LED that flashes every time
a Bipolar Violation, other than those
associated with a B8ZS code, is
received at the HRU’s DS1 input.
•
FRM
ESF - GREEN LED indicating that
framing pattern of the signal being
received at the HRU’s DS1 input is
ESF.
HLU-612
DCE
FEMALE
MALE
2
5
3
2
5
3
RD (RECEIVE DATA)
TD (TRANSMIT DATA)
GND
DB9
DB9
DTE
DTE
TERMINAL
TERMINAL
3
2
7
DB25
Figure 3. DB-9 Pin-outs.