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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)： | 68/164頁(yè) |
| 文件大?。?/td> | 1401K |
| 代理商： | PSF21911 |
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PSB 21911
PSF 21911
U-Transceiver
Semiconductor Group
68
11.97
TL
Wake-up signal received from the LT
The U-transceiver is requested to start an activation procedure. The TL-
criterion is fulfilled when 12 consecutive periods of the 10-kHz wake-up tone
were detected.
When in the “Pending Timing” state and automatic activation after reset is
selected (NT-AUTO mode), a recognition of TL is assumed every time the
“Pending Timing” state has been entered from the “Test” state (caused by C/I
code DI). This behavior allows the U-transceiver to initiate one single
activation attempt after having been reseted.
BBD0/1
Binary “0s” or “1s” detected in the B- and D-channels
This internal signal indicates that for 6-12 ms, a continuous stream of binary
“0s” or “1s” has been detected. It is used as a criterion that the receiver has
acquired frame synchronization and both its EC- and EQ-coefficients have
converged. BBD0 corresponds to the signal SL2 in the case of normal
activation and BBD1 corresponds to the internally received signal SN3 in case
of an analog loop back in the NT-mode.
Timers
The start of timers is indicated by TxS, the expiry by TxE. The following
table 14
shows
which timers are used by the U-transceiver:
Table 14
Timers
Timer
T1
T7
T11
T12
T13
Duration (ms) Function
15000
40
9
5500
15000
State
Supervisor for start-up
Hold time
TN-transmission
Supervisor EC-converge
Frame synchronization
Receive reset
Alerting
EC-training
Pend. receive
reset
Pend. timing
T14
0.5
Hold time
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