Hitachi GR2000 Series - Manual (Page 307)

Maintenance Procedure
GR2K-GA-0015 8-45
Ver. 07-02
Figure 8-43 Sample Result of Internal Loopback Test for ATM Line
(2) Loop Connector Loopback Test for ATM Line:
This test loops back the test frame at the loop connector connected to the NIF.
Before testing, disconnect the cable of the subject line number and replace it with
an applicable loop connector. Then, the testing can be executed by entering the
test interfaces and no test interfaces commands from the device management
terminal. For example, to test line No. 0 of NIF No. 0, enter the command lines as
shown below:
> test interfaces nif 0 line 0 connector [CR]
(Wait about 1 minute.)
> no test interfaces nif 0 line 0 [CR
The result will appear in a similar manner as (a) internal loopback test for ATM
line. Make sure that “Send-NG” and “Receive-NG” are both 0 and “PHY layer
status” is “up” (normal).
*
Note: When “Line, clock” in the configuration information has been defined to “external” (default)
and the line is replaced with a loop connector, the resulting discontinuances of clock signal
from the line causes the NIF’s ACT lamp to turn off and LINE ERR lamp to turn on. This is not
an error; you can continue the testing. While testing, the target clock is changed to the
internal clock, and the router can send/receive the loopback packet. When “Line, clock” in
the configuration information has been defined to “independent” instead, this will not occur.
> test interfaces nif 1 line 0 internal
You have warning message. Use “show warning” to see them.
>
08/02 10:36:18 E4 LINEATM NIF:1 LINE:0 32020000 1550:700000000000 Line status
become up.
> no test interfaces nif 1 line 0
1999/08/02 10:37:13
Interface type:OC-3c/STM-1 ATM(multi-mode)
Test Count:48
Send-OK:48Send-NG:0
Receive-OK:48Receive-NG:0
Timeout:0Data compare error:0
<AAL layer>
NIF buffer busy:0RP buffer busy:0
Overrun:0T1 timeout:0
CRC32 error:0AAL5 length mismatch:0
Long pkts:0Short pkts:0
<ATM layer>
Overrun:0Invalid VPI/VCI:0
Uncorrectable HEC error:0
<PHY layer>
PHY layer status :up
LOS:0 LOF :0 OOF:0
LOP:0 LOC :0 OOCD:0
L-RDI:0P-RDI:0L-AIS:0
P-AIS:0L-FEBE:0P-FEBE:0
L-BIP24:0P-BIP8:0S-BIP8:0
Symbol error:0
>
08/02 10:37:18 E4 LINEATM NIF:1 LINE:0 32020000 1550:700000000000 Line status
become up.
>
Must be 0
Must be “up”