Table 6-6 Error Status Details - Hitachi SD.LINK User Manual

6 MAINTENANCE
Table 6-6 details the error status.
Transmit/
No. Error name
Receive
1 Transmit Underrun
2 Receive DPLL error
3 Frame length
violation
4 Non-octet
sequence
5 Abort sequence
6 CRC error
7 Overrun
8 Receive timeout
error

Table 6-6 Error Status Details

Error description
A transmitter underrun
occurred while transmitting a
frame.
The DE bit is set when a
transition is missing in the
coding mode in which bit-
specific transitions take place.
A frame length exceeding the
maximum defined for this
channel was detected.
A frame containing a bit
length that could not be
precisely divided by 8 was
received.
At least seven consecutive 1s
were received while receiving
a frame.
A CRC error was detected in
a frame.
A receiver overrun occurred
while receiving a frame.
Frames in excess of
limitations was transmitted or
received.
6-28
Required user action
Any of these types of errors may occur when
the power supply in a networked controller unit
is turned off and back on again, or when the
CPU is reset. In these cases, the error is
caused by something other than a hardware
failure. If any of these types of errors occurs
100 times or more in a single day due to a cause
other than any of the above-mentioned
operations, do the following:
(1) Check that all of the optical connectors used
for connections between the existing
SD.LINK modules are inserted completely
into those modules' receptacles. Any
incompletely inserted connector must be
inserted completely into the receptacle.
(2) Check that no optical fiber cable wired to an
existing SD.LINK module is bent
excessively. Any excessively bent optical
fiber cables must be corrected (the bending
radius must be 30 mm or more).
Check, also, that no such optical fiber cable
is damaged. Any damaged optical fiber
cable must be replaced with a new one.
(3) Check that all of the optical fiber cables
wired to the existing SD.LINK modules are
recommended ones (i.e., those identified by
the code MC-SM1005-
2F(Y)#2SC/P/0.2#2SC/P/0.2#50M). Any
non-recommended optical fiber cable, if
used, must be replaced with a recommended
one.
(4) Check that no optical fiber cable wired to an
existing SD.LINK module is too long.
Any wired optical fiber cable must be 15
km or less in length.
After you have checked the above items and
have made any necessary corrections, measure
the optical level of each of the optical fiber
cables wired to the existing SD.LINK modules,
and then check that there are no problems
indicated by the measured level values. (For
details, see "6.5 Optical Level
Measurement.")
If any of these types of errors still occurs 100
times or more in a single day, replace the
existing SD.LINK modules.