ADTRAN TSU LT, Руководство пользователя

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61203060L1-1A © 2003 ADTRAN, Inc. 53
Chapter 8
Circuit Testing
Before using the TSU LT to pass data, ADTRAN recommends running tests on the circuit. Testing consists
of sending a test pattern from end-to-end and checking for errors in the pattern. There are two types of tests
used to accomplish this:
1. Loop-up the far end and then send a test pattern.
2. Send a test pattern from both ends and check at both ends.
Far End Looped Back Test
TSU LTs should respond to a loop-up code sent over the T1 circuit. The remote unit will “loop” the
network interface providing a path for data from the local unit over the circuit and back again. Sending a
known test pattern over this loop and checking for errors verifies circuit connectivity. The following
example loops the remote unit and sends a 511 pattern through the data path. Use the 511 test pattern with
any T1 configuration (regardless of the channel configuration) because 511 is always sent in the occupied
channels. Complete the steps outlined below to loop-up the remote TSU LT and send a test pattern.
Running the Test
1. Use the front panel up and down arrows to place the cursor on
4) T
EST
and press
E
NTER
to select.
Result: The first two
T
EST
submenu items display.
2. Using the up and down arrows
,
place the cursor on
N
ETWORK
T
ESTS
, and press
E
NTER
.
Result: Beginning display of the submenu items. Each menu item can be selected with the up and
down arrows.
3. Use the front panel up and down arrow keys to place the cursor on
REM LB:
and press
E
NTER
.
4. Move to
V.54 I
NBAND
PLB
and press
E
NTER
.
5. Now, use the front panel down arrow key to select
3) T
EST
P
ATTERN
.
6. Press
E
NTER
again to activate the
T
EST
P
ATTERN
submenu, and select
511 ACT DS0
S
.
7. Press
E
NTER
to activate the selection.
Result: The TSU LT always checks for 511 errors. The results of this check are shown under
submenu item 4.