Loopback Testing - ADC HiGain H2TU-C-231 List 1 Quick Installation

L
OOPBACK
Initiate loopback testing from the HiGain HDSL2 maintenance terminal screen or use the
MODE and SEL buttons. The inband codes below (except COLB and RULB) can also be
sent by a test set.
Network
Loopback Inband Code Description
NLOC 1111000
NREM 1110000
(a)
COLB
(a)
RULB
SMJK 11000
CREM 1111110
CLOC 1111100
Loopdown 11100
(a) Dual loopbacks are only initiated from a maintenance terminal or the MODE and SEL buttons.
Message
(b)
PWR FEED SHRT
(b)
PWR FEED GND
(b)
PWR FEED OPEN
LOSW
LLOS
RLOS
(c)
LAIS
(c)
RAIS
(c)
LRAI
(c)
RRAI
(c)
xxxx-DBER
(c)
PRMF
(c)
PRMN
xxxx-HBER
xxxx-MAL
xxxx-LA
(a) Front-panel alarm messages are listed in order of priority. ALRM displays prior to any alarm message.
Pressing the SEL 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 1 DSX-1 output ports to the
cross-connect panel must be grounded at both ends.
T
ESTING
H2TU-C
1111110
NLOC CREM
1111000
Table 1. 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.
DSX-1 signal is looped back to the network at the H2TU-R SmartJack module.
Signal from customer is looped back to the customer at the H2TU-C.
Signal from customer is looped back to the customer at the H2TU-R.
Deactivates any of the above loopbacks.
Table 2. 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 sync.
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. (xxxx 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. (xxxx denotes either TUC or TUR.)
The margin on the HDSL2 loop has dropped below the threshold setting. (xxxx denotes
either TUC or TUR.)
The attenuation on the HDSL2 loop has exceeded the maximum threshold value.
H2TU-R
TLOS
NREM
CLOC
1111100
1110000
11000
SMJK
Customer
Premises
(a)