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
文件頁數(shù)： 73/164頁
文件大?。?/td> 1401K
代理商： PSF21911
PSB 21911
PSF 21911
U-Transceiver
Semiconductor Group
73
11.97
Synchronized 1
When reaching this state the U-transceiver informs the LT-side by sending the
superframe indication (inverted synch.-word). The loop-back commands decoded by the
EOC-processor control the output of the transmit signals:
– Normal ACT and UOA = 0:
– Any loop-back and UOA = 0 (no loop-back):
The value of the issued SAI-bit depends on the received C/I-channel code: DI and TIM
lead to SAI = 0, any other C/I-code sets the SAI-bit to 1 indicating activity on the S/T-
interface. The U-transceiver waits for the receipt of UOA = 1 to enter the “Synchronized
2” state.
SN3
SN3T
Synchronized 2
In this state the U-transceiver has received UOA = 1. This is a request to activate the
S/T-reference point. The loop-back commands detected by the EOC-processor control
the output of indications and transmit signals:
– Normal activation and UOA = (1):
– Single channel loop-back and UOA = (1):
– Loop-back 2 (LBBD):
The value of the issued SAI-bit depends on the received C/I-channel code: DI and TIM
lead to SAI = 0, any other C/I-code sets the SAI-bit to 1 indicating activity on the S/T-
interface. The U-transceiver waits for the receipt of the C/I-channel code AI to enter the
“Wait for ACT” state.
SN3 and AR
SN3T and AR
SN3T and ARL
Test
The “Test” mode is entered when the unconditional commands RES, SSP, Pin-RES or
Pin-SSP are used. It is left when normal U-transceiver operation is selected via pins RES
and TSP and the C/I-channel codes DI or ARL are received.
The following signals are transmitted on the U-interface:
– No signal level (SN0) when the C/I-channel code RES is applied or a hardware reset
is activated.
– Single pulses (SP) when the C/I-channel code SSP is applied or pin TSP =1.
Transparent
This state is entered upon the detection of ACT = 1 received from the LT-side and
corresponds to the fully active state. In the case of a normal activation in both directions
of transmission the the following codes are output:
– Normal activation or single-channel loop-back:
– Loop-back 2:
AI
AIL
相關(guān)PDF資料
PDF描述
PSB21911 ISDN Echocancellation Circuit for Terminal Applications IEC-Q TE
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