psf21911 ETC-unknow, psf21911 Datasheet - Page 57

• Manufacturer Part Number: psf21911
• Description: Isdn Echocancellation Circuit Terminal Applications Iec-q
• Manufacturer: ETC-unknow

Control via Network
– All Downstream bits.
Automatic control via U-transceiver
– ACT (Activation bit)
– SAI (S Activity Indicator)
– FEBE (Far-end Block Error)
– CSO (Cold Start Only).
Control via Pins
– PS1 (Power Prim. Source)
– PS2 (Power Sec. Source)
Control via MON-2
– only the undefined bits marked with binary ’1’
– SAI (S Activity Indicator)
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’
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
– Only the undefined bits market with binary “1” may be controlled directly by a MON-2-
– 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
Semiconductor Group
can be controlled via MON-2 after MON-8 ’PACE’.
can additionally be controlled via MON-8-’SFB’.
can be controlled via MON-2 after MON-8 ’PACE’.
state, pins, MON-2 commands and other MON commands.
message.
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).
= (0) –> Far-end block error occurred
= (1) –> Layer 2 ready for communication
= (0) –> S-interface is deactivated;
= (0) –> U-transceiver is warm start capable;
= (1) –> PS1 = (1) –> Prim. supply ok
= (1) –> PS2 = (1) –> Sec. supply ok
= (0) –> S-interface is deactivated;
= (0) –> NT busy in test mode (MON-1)
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U-Transceiver
PSB 21911
PSF 21911
11.97