參數(shù)資料
型號： MK50H27Q25
廠商： STMICROELECTRONICS
元件分類： 微控制器/微處理器
英文描述： 1 CHANNEL(S), 51M bps, SERIAL COMM CONTROLLER, PQCC52
封裝： PLASTIC, LCC-52
文件頁數(shù)： 24/58頁
文件大?。?/td> 621K
代理商： MK50H27Q25
T / TTC D
SUERM THRESHOLD. Number of consecutive signal units received
in error that will cause an error rate high indication. When operating
in TTC compliant mode (CSR2 JSS7E=1), this field should contain the
D value (typically 16) used for TTC JT-Q703 SUERM operation.
M
PROVING ABORT LIMIT. Number of consecutive aborted proving
periods that cause the MK50H27 to return to the OUT-OF-SERVICE
state.
D / TTC T
SUERM ERROR RATE. The lowest acceptable number of signal
units per signal unit error.
When operating in TTC compliant mode
(CSR2 JSS7E=1), this field should contain the T SUERM Threshold
value (typically 285) used for TTC JT-Q703 SUERM operation. This
field should be expressed as a two’s complement value.
Tin
NORMAL AERM THRESHOLD. Number of signal unit errors that
cause the abortion of a normal proving period.
Tie
EMERGENCY AERM THRESHOLD. Number of signal unit errors
that cause the abortion of an emergency proving period.
m
Maximum frame length. Number of bytes allowed in the information
portion of received MSUs before octect counting begins.
NOTE:
The operation of the SUERM (Signal Unit Error Rate Monitor) is different between CCITT / ITU compliant
systems and TTC JT-Q703 compliant systems. Although both SUERM schemes operate based upon a
leaky bucket principle, there are some major differences in their implementation.
For CCITT/ITU Q.703 the SUERM count is incremented by 1 for each errored SU received until a thresh-
old T (typically 64) is reached, at which time a link failure is declared.. For every D (typically 256) good
SUs received the SUERM Count, Cs, is decremented by 1 (not to go less than 0).
For TTC JT-Q703 the SUERM count is updated once every monitor time Te (typically 24 ms) regardless
of the number of SUs received during the time Te. If the last SU received was errored, then the SUERM
count is incremented by D (typically 16) when Te expires. If the last SU received was good, then the
SUERM count is decremented by 1 (not to go less than 0) when Te expires. If the SUERM count should
ever reach the threshold T (typically 285), then a link failure is declared.
For the MK50H27 the value
used for time Te is the same value as programmed for time Tf (typically 24 ms for both).
Due to this difference in SUERM operation, the fields in the MK50H27 Initialization Block that are used
for D and T are exchanged if JSS7E=1 selecting Japanese SS7 (TTC JT-Q703 compliance).
MK50H27
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