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OPERATION
a. A slave CSU displays the warning message W A R N -
ING: Interfering To Inband Communication
when the user attempts to perform any loopback:
Proceeding with the diagnostic can result in inaccu-
rate data on the terminal or complete loss of com-
munication. Use only out-of-band communication
for performing loopbacks.
b. If you initiate a DS1 diagnostic while a DS0 diag-
nostic is in progress, the DS0 diagnostic is termi-
nated.
Test Loop
This function controls the DS1 Test Loop described in Section 4. The front
panel TM indicator reflects the status of this test. To start or stop this test,
press T.
Line Loop
This function controls the DS1 Line Loop described in Section 4. The front
panel TM indicator reflects the status of this test. To start or stop this test,
press L.
Local Test
This function controls the DS1 Local Test described in Section 4. The
front panel TM indicator reflects the status of this test. This test can also
be used in conjunction with DS1 Self-Test to control the DS1 Local Test
with Self-Test described in Section 4. To start or stop this test, press O.
Remote Test
This function controls the DS1 Remote Test described in Section 4. There
is a five second delay after you start or stop this test. During these five-
second intervals before and after the actual test, the CSU is required to
send inband loopback codes to the remote CSU. This test can also be used
in conjunction with DS1 Self-Test to control the DS1 Remote Test with
Self-Test described in Section 4. The status line NLB and RT indicators,
and front panel LB and TM indicators reflect the status of this test. To
start or stop this test, press R.
NI Loop
This function controls the DS1 Network Interface Loopback function de-
scribed in Section 4. A Telco-provided DS1 Interface Connector must be
installed at the remote CSU. There is a five second delay after you start
or stop this test. During these five-second intervals before and after the ac-
tual test, the CSU is required to send inband loopback codes to the remote
CSU. This test can also be used in conjunction with DS1 Self-Test to con-
trol the DS1 Network Interface Loopback with Self-Test described in Sec-
tion 4. The front panel TM indicator reflects the status of this test. To
start or stop this test, press N.
3-26
CAUTION
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