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700-701-100-02
Operating Option
Network Diagram
Lpbk Dir
OFF
NETWORK
CUSTOMER
Lpbk Loop(s)
NONE
Lpbk Position
NONE
Lpbk Timeout
NONE
20
120
Field
BER Test
STOP
RESTART
Det. Status
NOT ACTIVE
SYNCING
IN SYNC
Test Time
Bit Errors
BER
UTU-701 and ETU-751 List 1
Table 30. Test Menu Options
Default Setting
Shows the loopback position and direction when the loopback is enabled and active.
Selects one of three loopback direction modes:
No loopbacks are active.
The loopback selected in Loopback Position is directed toward the network equipment connected to
the LTU.
The loopback selected in Loopback Position is directed toward the customer's equipment connected
to the NTU.
Selects the loops used in the loopback test:
Option not available with single-pair HDSL card.
Selects the possible loopback positions:
Option not available with single-pair HDSL card.
Selects one of three loopback timeouts:
Disables automatic timeout cancellation of all loopbacks.
Automatically cancels any loopback 20 minutes after initiation.
Automatically cancels any loopback 120 minutes after initiation.
Table 31. BER Section of Test Menu
Description
Selects the state of the BER test.
Terminates the current test and resumes normal transmission of user payload. Prior BER tests are
maintained for reference on the screen. STOP must be selected to terminate the BER test prior to exiting
the screen.
Begins BER test. This disrupts user payload traffic and inserts a pseudo-random bit sequence (PRBS)
at the LTU toward the NTU. The actual pattern used is a 2x10
ENTER
option (pressing the
restarts the test.
Displays the current status of the BER detector at the LTU.
Displays while the BER is not running.
Indicates that the BER qualification period is in progress (128 received bits are compared to the PRBS).
Indicates that the BER test is in progress. The BER meter accumulates errors once per test interval (16
seconds). In a high bit error environment the test interval is shortened and the BER meter is updated
every second.
Displays the elapsed test time for the BER test.
Displays the number of bits received that did not match the PRBS pattern. This field is updated every
30 seconds, with a maximum value of 255 per update.
Displays the Bit Error Rate computer for the current test. This field is updated very 16 seconds, as is
displayed in exponential form. The lowest positive displayable value is 1x10
August 9, 2002
key) while the test is running. This entry reinitiates the BER values and
15
pattern as defined by reselecting this
-11
.
Testing
61
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