Loopback Testing - ADC HIGAIN HDSL2 Quick Installation Manual

L
OOPBACK
Initiate loopback testing from the HiGain HDSL2 maintenance terminal screen or use the
MODE and LBK buttons. The inband codes below (exceptions are COLB and RULB) can
also be sent by a test set.
Loopback Inband Code Description
NLOC 1111000
NREM 1110000
(a)
COLB
(a)
RULB
CREM 1111110
CLOC 1111100
SMJK 11000
Loopdown 11100
(a) Dual loopbacks are only initiated from the MODE and LBK buttons.
For more information about the HiGain HDSL2 maintenance screens, refer to the H2TU-C-231 List
1F technical practice, document number 152-231-116-xx. Contact Customer Service to obtain a copy.
Message
(b)
PWR FEED SHRT
(b)
PWR FEED GND
(b)
PWR FEED OPEN
SPNn-LOSW
LLOS
RLOS
(c)
LAIS
(c)
RAIS
(c)
TRCI
(c)
RRAI
(c)
xxx-DBER
(c)
PRMF
(c)
PRMN
xxx-HBER
xxx-MAL
xxx-LA
(a) Front-panel alarm messages are listed in order of priority. ALRM displays prior to any alarm message.
Pressing the LBK button 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 pins 20 and 21.
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 H2TU-C-231 List 1F DSX-1 output ports
to the cross-connect panel must be grounded at both ends.
T
ESTING
H2TU-C
1111110
NLOC CREM
1111000
Network
* When enabled, TLOS is an automatic loopback
that occurs with an LOS at the remote DS1 input.
GNLB Loopback Commands
DSX-1 signal is looped back to the network at the H2TU-C.
DSX-1 signal is looped back to the network at the H2TU-R.
DSX-1 signal is looped back to the network at the H2TU-C and signal from the
customer is looped back to the customer at the H2TU-C.
DSX-1 signal is looped back to the network at the H2TU-R and signal from the
customer is looped back to the customer at the H2TU-R.
DS1 signal from customer is looped back to the customer at the H2TU-C.
DS1 signal from customer is looped back to the customer at the H2TU-R.
DSX-1 signal is looped back to the network at the H2TU-R SmartJack module.
Deactivates any of the above loopbacks.
Front-Panel Alarm Messages
Description
A short between the Tip and Ring of the HDSL2 pair.
The HDSL2 loop is grounded.
A line power open condition.
The HDSL2 loop has lost synchronization. The span closest to the network has
highest priority.
No signal is detected at the DSX-1 input to the H2TU-C.
No signal is detected at the DS1 input to the H2TU-R.
Local Alarm Indication Signal.
Remote Alarm Indication Signal.
An RAI alarm (yellow LED) from the CPE with an error-free signal from the line unit
or network.
An RAI alarm (yellow LED) from the Customer Premises Equipment (CPE) with errors
from the line unit or network.
A system DS1 Bit Error Rate (BER) alarm. (xxx denotes either TUC or TUR.)
H2TU-R Performance Report Messaging BER threshold exceeded at far end.
H2TU-R Performance Report Messaging BER threshold exceeded at near end.
A system HDSL2 Block Error Rate (BER) alarm. (xxx denotes either TUC or TUR.)
The margin on the HDSL2 loop has dropped below the threshold setting.
(xxx denotes either TUC or TUR.)
The attenuation on the HDSL2 loop has exceeded the maximum threshold value.
(xxx denotes either TUC or TUR.)
H2TU-R
DS1
TLOS*
NREM
CLOC
1111100
1110000
11000
SMJK
Customer
Premises
(a)