ADTRAN 3010 NTU-8 - Manual (Page 14)

Total Access 3000/3010 NTU-8 Single Fiber Quad E1 Installation and Maintenance Practice
8 61182301E1-5A
OPERATION
The NTU-8F provides a platform to exchange data between four G.703 interfaces and an
optical fiber interface. The customer data connection is via the RJ-45 connector on the unit.
An optical fiber interface is provided for communication with the loop. The NTU-8F operates
with an LTU-8 at the other end of the fiber optic cable.
FRONT PANEL PUSHBUTTON
Pushbuttons on the front panel ( Table 5 ) provide the following functionality (when the option
is enabled on the LTU-8).
Table 5. Front panel Pushbuttons
Pushbutton Function
Port Select Press the PORT SELECT button to select the active port. Selection
choices cycle through the provisioned G.703 E1 ports in following
order:
No Port, Port 1, Port 2, Port 3, and Port 4.
Local Loop/ERR INJ With a port selected, and a Bit Error Rate Test (BERT) is not in
progress, press the LOCAL LOOP/ERR INJ button to either initiate or
terminate a local loop on the selected port.
If a BERT is in progress, press the button to inject a single bit error.
Remote Loop With a port selected, press the REMOTE LOOP button to place or
remove a remote loop on the selected port's single data service. This
action sends respective inband loop-up or loop-down patterns to
the far end (in the associated data service timeslots).
BERT With a port selected, and no local loops, press the BERT button to
start or stop a BERT on the selected port.