VeEX MPA User Manual page 483

MPA_e_manual_D07-00-129P_RevA00
Protocol Tabs
AU = Administrative Unit
TU = Tributary Unit
SDH LEDs
When the SDH protocol processor tab is selected, the following status indicators and
LEDs are displayed in the
LED
RS
LOS
LOF
OOF
B1
MS
MS-REI
483
LED Quick Status Area
Description
RSOH Status LED. Indicates if any of the errors or alarms
within this portion of the overhead are being received,
including a Frame error. This is a status LED.
Loss of Signal. Indicates that a valid SDH signal is not being
received. If an all-zeros pattern exists for 100 milliseconds or
longer on the incoming SDH signal, then an LOS is reported.
Loss of Frame. Indicates that a frame alignment problem
with the incoming SDH signal has been detected. An LOF is
reported if an Out Of Frame (OOF) defect continues for 3
milliseconds or longer. This is alarm LED.
Out Of Frame. Declared when four or more consecutive
errored frames are detected on the incoming SDH signal.
This is an alarm LED.
RSOH BIP-8 Code Violation. Indicates an error in the SDH
frame. B1 errors are parity errors. The B1 byte carries the
parity information, so a B1 error is an RS error that applies
not only to the RSOH, but the entire SDH frame. Any error in
the frame will result in B1 error. This is an error LED.
MSOH Status LED. Indicates if any of the errors or alarms
within this portion of the overhead are being received. This is
a status LED.
MSOH Remote Error Indication. Indicates that an error is
occurring at downstream Line terminating equipment. An REI
is also known as a Far-End Block Error (FEBE). The M0 and
M1 bytes of the MSOH are used for this indicator. This is an
error LED.
and the Large LED screen.