參數(shù)資料
型號: PSB21911
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
文件頁數(shù): 100/164頁
文件大小: 1401K
代理商: PSB21911
PSB 21911
PSF 21911
Layer 1 Activation/Deactivation
Semiconductor Group
100
11.97
3.3
Layer 1 Activation/Deactivation
Table 22
shows all U-interface signals as defined by ANSI.
Table 22
U-Interface Signals
Notes:
1)
Alternating
±
3 symbols at 10 kHz
2)
Must be generated by the exchange
3)
Alternating
±
3 single pulses of 12.5
μ
s duration spaced by 1.5 ms
Signal
Synch. Word
(SW)
Superframe
(ISW)
NT –> LT
±
3
no signal
absent
absent
present
present
LT –> NT
±
3
no signal
absent
present
present
present
Test Mode
no signal
2B + D
M-Bits
TN
1)
SN0
SN1
SN2
SN3
SN3T
±
3
±
3
±
3
no signal
present
present
present
present
no signal
1
1
1
normal
no signal
1
1
normal
normal
TL
1)
SL0
SL1
SL2
SL3
2)
SL3T
±
3
±
3
±
3
no signal
present
present
present
present
no signal
1
0
0
normal
no signal
1
normal
normal
normal
SP
3)
no signal
±
3
no signal
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