ADTRAN TSU LT User Manual download pdf (Page 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

EST

submenu items display.

2. Using the up and down arrows

place the cursor on N

ETWORK

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.5 4 I

NBAND

PLB and press E

NTER

5. Now, use the front panel down arrow key to select

3) T

EST

ATTERN

6. Press

NTER

again to activate the T

EST

ATTERN

submenu, and select 511 ACT DS0

7. Press

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.

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ADTRAN TSU LT User Manual Page 53

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