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(a)
Message
Description
1=xx or 2=yy
Indicates the power of the received HDSL signal on each loop relative to noise. Any value
of 6 dB or greater is adequate for reliable system operation.
nHDU
Number (n) of doublers in the circuit.
INSL xxDB
The maximum Insertion Loss (INSL) message appears followed by xxdB, where xx is the
maximum insertion in dB of all spans and loops.
ACQ1 or ACQ2
The multiplexers of the HLU and the HRU, or the first doubler, are trying to establish
synchronization over Loop 1 or Loop 2 of Span 1.
AnL1 or AnL2
The multiplexers of the two devices on Span n are trying to establish synchronization with
each other on Loop 1 or Loop 2, where n is the number of the span.
BAD RT?
The HLU is not receiving any response from the HRU.
FERR
Framing bit error occurred at HLU DSX-1 input.
H1ES or H2ES
HDSL Loop 1 or Loop 2 CRC error.
LBPV
A local bipolar violation has been received at the DSX-1 input to the HLU.
MNGD
The HLU is under control of the HMU-319 network management unit.
PWR FEED GND
One of the HDSL loops has been grounded.
PWR FEED ON
Indicates that the HDSL loops are not grounded.
PWR FEED OFF
HDSL span power has been turned off.
PWR FEED SHRT Indicates a short between the two HDSL pairs or the inability of the HRU to communicate
with the HLU.
SELF TEST
The HLU is in a self-test mode. This occurs every power on/off cycle.
SIG1 or SIG2
The transceivers of the HLU and HRU, or first doubler, are trying to establish contact with
each other on Loop 1 or Loop 2 of Span 1.
SnL1 or SnL2
The transceivers of the two devices on Span n are trying to establish contact with each
other on Loop 1 or Loop 2, where n is the number of the span.
TLOS
HRU is in a logic loopback state caused by a loss of its T1 input from the CI (if enabled
at the HRU through its TLOS switch options).
(a) Normal operating messages are in bold.
Front-Panel
Description (default values in bold)
Display Code
EQL
Sets the DSX-1 equalizer (EQL) to: 0 (0 to 132 ft.), 133 (133 to 265 ft.),
266 (266 to 398 ft.), 399 (399 to 532 ft.), 533 (533 to 655 ft.).
LPBK
Enables (ENA) or disables (DIS) all inband SMJK loopback commands.
SPLB
Configures the system for generic inband loopback commands (GNLB) or special loopback
commands (A1LB, A2LB, A3LB, A4LB, A5LB).
PLEV
DIS = disables HDSL powering.
LOW = HDSL line voltage is -140 Vdc maximum.
AUTO = automatically switches between -140 Vdc for non-doubler applications and
±112 Vdc for doubler applications.
HIGH = ±112 Vdc for all applications.
ZBTS
ON = ESF frame is operating in Zero-Byte Time Slot Interchange (ZBTSI) mode.
OFF = ESF frame is operating in normal non-ZBTSI mode.
BERT
NONE = prevents generation of a system alarm due to excessive BER.
1E-6 or 1E-7 = alarm activates when BER threshold exceeds 10
LBTO
Loopback timeout = NONE, 20, 60, 120 minutes.
ALM
Enables (ENA) or disables (DIS) output alarm on pins 22 and 30 when alarm condition
occurs.
DS1
Line code = places the HLU and HRU in B8ZS, AUTO, or AMI mode.
FRMG
Framing = AUTO or Unframed (UNFR).
HAIS
2LP = transmits the AIS signal at both the HLU and the HRU T1 output ports when both
HDSL loops are not in sync (LOSW). 1LP = applies when either of the two HDSL loops are
not in sync or if a Margin alarm occurs.
SAIS
Enables (ENA) or disables (DIS) transmission of AIS signal during NREM/SMJK loopbacks.
RDA
Enables (ENA) or disables (DIS) alarm indications due to remote DS1 LOS at HRU input.
ALMP
Enables a line to output an (AIS) payload of all ones or an (LOS) condition at its DS1 ports
for LOSW, DS1 LOS, and margin alarms.
BPVT
Enables (ENA) or disables (DIS) Bipolar Violation Transparency (BPVT).
(a)
MARG
0 to 15 dB (default = 4 dB).
(a)
DS0
NONE = no DS0 channels blocked; BLK = some channels blocked.
CONF
YES = updates current selections; NO =does not update current selection.
(a) Can only be set through the Maintenance Terminal.
Front-Panel Diagnostic Messages
System Setting Messages
-6
- 7
or 10
, respectively.
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