Northern UTA220/UTA220k - Manual (Page 126)

14-6
UTA220/UTA220k
Diagnostics
To initiate the test, select the BILATERAL LOOPBACK
option from the PORT TEST submenu. The UTA220 can be
on-line or off-line when the test is initiated but a call must be
placed before the unit can loop B-channel data. Any protocol,
mode, and DTE rate can be used, however, the protocol and
DTE rates on the two units must be compatible. The remote
unit should be set to the same rate adaptation protocol as the
local UTA220 and left in normal data mode (NOT placed in
Bilateral test mode). Data sent by the remote UTA220 will be
received by the local UTA220 then echoed back to the remote
UTA220. The test is successful if the data is successfully
echoed back to the sender. A BERT device can be helpful in
checking for data errors.
Also, data from the local DTE will be echoed back to the DTE.
The DTE portion of the test verifies the operation of the DTE,
the DTE cable, the DTE interface to the UTA220, and the data
buffers in the UTA220.
The test should be run in both directions if possible (i.e., use
the local UTA220 as both the sending unit and as the loopback
unit). If the B-channel data test is successful, it indicates that
the local and remote units and the network are functioning. If
there are errors, the problem could be in any of those elements.
DIAGNOSTIC STATUS DISPLAY
The UTA220 LCD can display a status screen that provides
diagnostic information concerning the state of the UTA220
and the link. The status displays are found under the
DIAGNOSTIC OPTIONS menu and are described below.
Front Panel Keypad Test
This test allows you to verify the functioning of the front panel
buttons. After this test is begun, press each key. The key legend
will be displayed on the LCD when the key is pressed. The *
(UTA220k) or “HOME” (UTA220) key ends the test.
View Product Information
Displays software checksum, self-check status, PC board
number and the software revision code.
View Diagnostic Code
This display is for factory use.