Black Box DESKTOP TELCO, Руководство пользователя

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TELCOLINK DT - AccessDSL NTU
User Manual
Version: 2.5 Page 18 of 66
3.4 Test Loops
3.4.1 Standard Test Loops
The test loops can be activated via the monitor interface.
Figure 3-5: standard Test Loops
Note:
On the slave side, Loop 1 can be activated locally, Loop 2 can be activated locally or remotely
by the master (LOOP2R command). Loop 1 and Loop 2 on slave can be activated from master
via virtual terminal connection (see CONNECT command description).
Both the NE LED on the slave and the FE LED on the master will be lit amber when Loop2 is
active on slave unit.
At the regenerator point Loop2 on N-side can be activated locally or remotely by the master
(LOOP2R command). Loop 2 on C-side and Loop1 can be activated locally or remotely by the
master via virtual terminal connection (see CONNECT command description and Repeater
Manual).
Both the NE LED on the regenerator and the FE LED on the master will be lit amber when
Loop2 is active.
On the master side, Loop 1 and Loop2 can only be activated locally. The NE LED will be lit
amber when Loop 1 or 2 is active.
3.4.2 Analog Loop Back
To test the Black Box Network Services equipment itself, the Analog Loop Back can be used.
To perform this test, the xDSL - cable has to be disconnected from the unit and the test can be
activated with the appropriate monitor command (see chapter 'Black Box Network Services
Monitor').
During the Analog Test Loop, the xDSL-receiver part receives the transmitted signal of its own
transmitter due to the impedance mismatch in the xDSL-line transformer.
All data of the user interface is looped back according to the UIF and its settings.
An Analog Loop Back causes a non-urgent alarm.
Master
Slave
N-side xDSL
Channel
Loop 1 Loop 2
Loop 2 Loop 1
TX
TX
RX
RX
Repeater
Loop 2 N
C-side xDSL
Channel
Loop 1
E1 interface
Loop 2 C