ADC higain h2tu-c-319 list 4e Manuale Utente

HiGain HDSL2 has a family of loopback options for analyzing circuit functionality. The loopback signal is 
transmitted and returned to the sending device for comparison. This allows you to verify the integrity of the 
HDSL2 channels to the H2TU-C, the H2TU-C DSX-1 interface and the DS1 channels to the customer. Loopback 
options include:

Generic Loopback (GNLB) commands, including the SmartJack (SMJK) option (see 

)

Special Loopback (SPLB) commands (see 

) and the following 

command tables:

Addressable Repeater Loopback commands: A2LB (see 

Addressable Repeater Loopback commands: A3LB, A4LB (see 

Loopback commands can be initiated by:

Selecting the loopback type using the MODE and LBK pushbuttons on the H2TU-C front panel or the manual 
loopback (LBK) pushbutton on the H2TU-R.

Selecting the loopback type from the Monitor menu when connected to the craft port of the H2TU-C or 
H2TU-R

Entering the loopback code into the test equipment connected to the H2TU-C or H2TU-R.

Network

Customer
Premises

Activate loopback using
one of the following:

• Maintenance terminal
• Test set

• MODE/SEL pushbuttons

Activate loopback using
one of the following:

• Test set

• Loopback pushbutton
• Maintenance terminal

NLOC

NREM
SMJK
TLOS

CREM

CLOC