參數(shù)資料
型號(hào)： PSF21911
廠商： SIEMENS A G
元件分類： 數(shù)字傳輸電路
英文描述： ISDN Echocancellation Circuit for Terminal Applications IEC-Q TE
中文描述： DATACOM, ISDN ECHO CANCELLER
文件頁(yè)數(shù)： 67/164頁(yè)
文件大?。?/td> 1401K
代理商： PSF21911
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PSB 21911
PSF 21911
U-Transceiver
Semiconductor Group
67
11.97
DEA
DEA-bit received from the LT-side
–
DEA = 0 informs the U-transceiver that a deactivation procedure has been
started by the LT-side.
–
DEA = 1 reflects the case when DEA = 0 was detected by faults due to e.g.
transmission errors and allows the U-transceiver to recover from this
situation (see state ’Pend. Deact. U’).
UOA
UOA-bit received from network side
–
UOA = 0 informs the U-transceiver that only the U-interface is to be
activated. The S/T-interface must remain deactivated.
–
UOA = 1 enables the S/T-interface to activate.
LOF
Loss of Framing on the U-interface
This condition is fulfilled if framing is lost for 576 ms. 576 ms are the upper
limit. If the correlation between synchronization word and the input signal is not
optimal, LOF may be issued earlier.
LSEC
Loss of Signal level behind the Echo Canceler
Internal signal which indicates that the echo canceler has converged.
LSU
Loss of Signal level on the U-interface
This signal indicates that a loss of signal level for a duration of 3 ms has been
detected on the U-interface. This short response time is relevant in all cases
where the NT waits for a response (no signal level) from the LT-side, i.e. after
a deactivation has been announced (receipt of DEA = 0), after the NT has lost
framing, and after timer T1 has elapsed.
LSUE
Loss of Signal level on the U-interface
After a loss of signal has been noticed, a 588 ms timer is started. When it has
elapsed, the LSUE-criterion is fulfilled. This long response time (see also LSU)
is valid in all cases where the NT is not prepared to lose signal level i.e. the LT
has stopped transmission because of loss of framing, an unsuccessful
activation, or the transmission line is interrupted.
Note that 588 ms represent a minimum value; the actual loss of signal might
have occurred earlier, e.g. when a long loop is cut at the NT-side and the echo
coefficients need to be readjusted to the new parameters. Only after the
adjusted coefficients cancel the echo completely, the loss of signal is detected
and the timer can be started (if the long loop is cut at the remote end, the
coefficients are still correct and loss of signal will be detected immediately).
SFD
Superframe (ISW) Detected on U-interface
FD
Frame (SW) Detected on U-interface
相關(guān)PDF資料
PDF描述
PSB21911 ISDN Echocancellation Circuit for Terminal Applications IEC-Q TE
PT3104C 15 WATT 24V TO 5V/12V/15V ISOLATED DC-DC CONVERTER
PT3100-24V 15 WATT 24V TO 5V/12V/15V ISOLATED DC-DC CONVERTER
PT3106C 15 WATT 24V TO 5V/12V/15V ISOLATED DC-DC CONVERTER
PT3402 "2.5V 12A
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