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L
OOPBACK
Initiate loopback testing from the maintenance menus or use the MODE and SEL
pushbuttons. The inband codes shown below can be sent by a test set. For more
information, refer to the H4TU-C-319 List 1 User Manual, document number
LTPH-UM-1031-xx.
DSX-1
Network
NLOC
H4TU-C
Loopback
inband Code
NLOC
1111000
NREM
1110000
NDU1
110000
CDU1
111100
NDU2
111000
CDU2
111110
SMJK
11000
CREM
1111110
CLOC
1111100
Loopdown
11100
Message
Description (listed in priority order)
(b)
PWR FEED SHRT
A short between Loop 1 and Loop 2 of the HDSL4 pairs.
(b)
PWR FEED GND
The HDSL4 loop is grounded.
(b)
PWR FEED OPEN
A line-power open condition.
SPNn-LOSW
The HDSL4 loop has lost synchronization. The span closest to the network has
highest priority.
LLOS
No signal is detected at the DSX-1 input to the H4TU-C.
RLOS
No signal is detected at the DS1 input to the H4TU-R.
(c)
LAIS
Line Alarm Indication Signal.
(c)
RAIS
Remote Alarm Indication Signal.
(c)
LRAI
An RAI alarm (yellow) from the Customer Premises Equipment (CPE) with an
error-free signal from the line unit or network. RAI signal is transmitted towards the
network.
(c)
RRAI
An RAI alarm (yellow) from the CPE with errors from the line unit or network.
xxx-LOF
DS1 input does not contain the ESF or SF frame pattern setting of the FRMG option.
(xxx denotes either Transmission Unit Central Office [TUC] or Transmission Unit
Remote End [TUR]).
(c)
xxx-DBER
A system DS1 Bit Error Rate (BER) alarm. (xxx denotes either TUC or TUR.)
(c)
PRMF
H4TU-R Performance Report Messaging BER threshold exceeded at far end.
(c)
PRMN
H4TU-R Performance Report Messaging BER threshold exceeded at near end.
(d)
xxxx-HBRx
A system HDSL4 Block Error Rate (BER) alarm.
(d)
xxxx-MALx
The margin on the HDSL4 loop has dropped below the threshold setting.
(d)
xxxx-LAx
The attenuation on the HDSL4 loop has exceeded the maximum threshold value.
(a) Front-panel alarm messages are listed in order of priority.
Pressing the SEL pushbutton initiates an Alarm Cutoff (ACO) message
(b) Message displays repeatedly as long as the alarm condition exists and is not included in the priority order.
(c) Does not activate the alarm relay access pin H.
(d) xxxx denotes TUC, TUR, or first or second doubler HDSL4 upstream or downstream interface. The single
x denotes Loop 1 or Loop 2.
To comply with the intrabuilding wiring requirements of GR-1089
CORE, Section 4.5.9, the shields of the ABAM-type cables that
connect the H4TU-C-319 List 1 DSX-1 output ports to the
cross-connect panel must be grounded at both ends.
T
ESTING
Span 1
CREM
CDU1
NDU1
H4D1
*
When enabled, TLOS is an automatic loopback
that occurs with an LOS at the remote DS1 input.
Table 1. GNLB Loopback Commands
Description
DSX-1 signal is looped back to the network at the H4TU-C.
DSX-1 signal is looped back to the network at the H4TU-R.
Signal is looped back to the network at H4D1.
DS1 signal from customer is looped back to the customer at H4D1.
Signal is looped back to the network at H4D2.
DS1 signal from customer is looped back to the customer at H4D2.
DSX-1 signal is looped back to the network at the H4TU-R SmartJack
module.
DS1 signal from customer is looped back to the customer at the H4TU-C.
DS1 signal from customer is looped back to the customer at the H4TU-R.
Deactivates any of the above loopbacks.
Table 2. Front-Panel Alarm Messages
Span 3
Span 2
CDU2
NDU2
H4D2
ALRM
displays prior to any alarm message.
NREM
Customer
SMJK
CLOC
Premises
*
TLOS
DS1
H4TU-R
(a)
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