參數(shù)資料
型號(hào)： 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)： 65/164頁
文件大?。?/td> 1401K
代理商： PSB21911
PSB 21911
PSF 21911
U-Transceiver
Semiconductor Group
65
11.97
2.5.7.3
Inputs to the U-Transceiver
C/I-Commands
AI
Activation Indication
The S-transceiver issues this indication to announce that the S-receiver is
synchronized. The U-transceiver informs the LT side by setting the “ACT” bit to
“1”.
AR
Activation Request
INFO1 has been received by the S-transceiver or the Intelligent NT wants to
activate the U-interface. The U-transceiver is requested to start the activation
process by sending the wake-up signal TN.
ARL
Activation Request Local Loop-back
The U-transceiver is requested to operate an analog loop-back (close to the U-
interface) and to begin the start-up sequence by sending SN1 (without starting
timer T1). This command may be issued only after the U-transceiver has been
reset by making use of the C/I-channel code RES or a hardware reset. This
assures that the EC- and EQ-coefficient updating algorithms converge
correctly. The ARL-command has to be issued continuously as long as the
loop-back is required.
DI
Deactivation Indication
This indication is used during a deactivation procedure to inform the U-
transceiver that timing signals are needed no longer and that the U-transceiver
may enter the deactivated (power-down) state. The DI-indication has to be
issued until the U-transceiver has answered with the DC-code.
DIN = 0
Binary “0” polarity on DIN
This asynchronous signal requests the U-transceiver to provide IOM clocks.
Hereafter, binary “0s” in the C/I-channel (code TIM “0000” or any other code
different from DI “1111”) keep the IOM-2 interface active.
DT
Data Through
This unconditional command is used for test purposes only and forces the U-
transceiver into a state equivalent to the “Transparent” state. The far-end
transceiver is assumed to be in the same condition.
EI1
Error Indication 1
The S-transceiver indicates an error condition on its receive side (loss of frame
alignment or loss of incoming signal). The U-transceiver informs the LT-side
by setting the ACT-bit to “0” thus indicating that transparency has been lost.
RES
Reset
Unconditional command which resets the whole chip; especially the EC- and
EQ-coefficients are set to zero.
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