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)： 57/164頁
文件大?。?/td> 1401K
代理商： PSB21911
PSB 21911
PSF 21911
U-Transceiver
Semiconductor Group
57
11.97
Control via Network
– All Downstream bits.
Automatic control via U-transceiver
– ACT (Activation bit)
– SAI (S Activity Indicator)
can be controlled via MON-2 after MON-8 ’PACE’.
– FEBE (Far-end Block Error)
can additionally be controlled via MON-8-’SFB’.
– CSO (Cold Start Only).
= (1) –> Layer 2 ready for communication
= (0) –> S-interface is deactivated;
= (0) –> Far-end block error occurred
= (0) –> U-transceiver is warm start capable;
Control via Pins
– PS1 (Power Prim. Source)
– PS2 (Power Sec. Source)
= (1) –> PS1 = (1) –> Prim. supply ok
= (1) –> PS2 = (1) –> Sec. supply ok
Control via MON-2
– only the undefined bits marked with binary ’1’
– SAI (S Activity Indicator)
can be controlled via MON-2 after MON-8 ’PACE’.
= (0) –> S-interface is deactivated;
Control via other MON-Commands
– NTM (NT-Test Mode)
– FEBE (Far-end Block Error);MON-8 message ’SFB’ sets a single FEBE bit to ’0’
= (0) –> NT busy in test mode (MON-1)
For details about the meaning of the overhead bits please refer to ETSI ETR 080 and
ANSI T1.601.
Overhead Bits Upstream Transmission
– The upstream overhead bits are controlled by means of the U-transceiver due to its
state, pins, MON-2 commands and other MON commands.
– Only the undefined bits market with binary “1” may be controlled directly by a MON-2-
message.
– All overhead bits are set to binary “1” when leaving a power-down state.
Overhead Bits Downstream Reception
– In the receive direction, the overhead bits of the last two U-interface superframes are
compared and a MON-2-message defining all 12 bits is issued if a difference between
both was found on at least one single bit other than the “FEBE” bit. Therefore, a MON-
2-message is sent not more often than once per superframe (12 ms interval).
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