Verilink PRISM 41TDM (34-00275.4) Product Manual - Manual (Page 43)

Maintenance 35
Local Loop
This loop occurs at the DDS network interface as a unidirectional or bidirectional
loop. It returns the DDS receive data to the DDS transmit line and the PRISM
41TDM transmit data to the unit receive data output.
Activate Remote
Access
This field is intended for DDS-I and DDS-II sites. Pressing Enter on this field
initiates full bandwidth communication with another PRISM 41TDM DDS unit at
the far end of the network link. This allows faster updates of far-end terminal
interface screens. In TXP-I or TXP-II modes, an in-band FDL is always available.
The near-end unit transmits an activation signal to the far-end unit for five seconds.
After this period, both units are in remote access mode. While in this mode, the
DCD and DSR signals to the DTE interface are false and the transmit data from
the DTE is not transmitted to the network. The command field also changes to
read: DEACTIVATE REMOTE ACCESS.
While Remote Access is active, the far-end type /revision information is displayed
in the upper left corner of each screen. Also on each screen, a field labeled
Element with selectable values of Near and Far appears. Pressing Enter on this
field activates the user interface for the selected element.
To terminate Remote Access, press Enter on the Disable Remote Access field.
Both units immediately return to normal operation.
During Remote Access, both units return to normal operation if communication with
the far end is lost for 30 seconds.
BERT These fields control the Bit Error Rate Test feature. BERT preempts user data and
can be performed on the DDS network, DTE A, or DTE B (TDM mode only).
Test Length Defines the run-time of test pattern generation and error accumulation. The choices
are 15 min, 30 min, 60 min, 24 hour, and Continuous.
Pattern Sync This field displays the current state of pattern sync during a test. If a test is not in
progress, No Test is displayed. If a test is active, but the receiver is not in pattern
sync, No Sync is displayed. If the receiver is in pattern sync, In Sync is displayed.
Elapsed Time Displays the time elapsed since a timed test began or, if completed, the total test
time.
Bit Errors Displays the total bit errors detected since the test began or since error statistics
were cleared (up to 999,999).
Errored Seconds This field displays the asynchronous errored seconds that have been detected since
the test began or since error statistics were last cleared. This parameter includes bit
error seconds and sync loss seconds.
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