VC-400LT/RT+ VDSL2 CO&CPE Router MANUAL Ver.B3
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Note:
The performance data above is for reference only, the actual data rate will vary on the
quality of the copper wire and environment factors.
6.1.4 Loop Back
Loopback (loop-back) describes ways of routing electronic signals, digital data streams, or flows of
items from their originating facility back to the source without intentional processing or modification.
This is primarily a means of testing the transmission or transportation infrastructure.
The loop back testing function for checking phone wire link problem: 1. System Loop. 2. Line Side
Loop
To config the Loop Back, click on the “Loop Back” link in the left navigation bar. A screen is
displayed as shown in Figure 6.1.4
Figure 6.1.4 Loop Back Activation/Deactivation Menu
The screen contains the following details:
Loop Back
Setting
Description
Channel No.
To which bearer channel number shall the settings apply? Channel 0
Loop
System loop or line side loop
State
Activate or deactivate loop back within the transmission convergence layer
Click APPLY at any time during configuration to save the information that you have
entered.
Click CANCEL to exit from this page without saving the changes.
Example applications(Only reference):
Performing transmission tests of access lines from the serving switching center, which
usually does not require the assistance of personnel at the served terminal.
Testing between stations (not necessarily adjacent) where in two lines are used, with the