psf21911 ETC-unknow, psf21911 Datasheet - Page 53

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

Table 8
EOC-code
i1 - i8 (Hex)
50
51
52
53
54
FF
EOC Transparent Mode
In transparent mode no acknowledgment, no triple-last-look and no execution of the
received commands is performed. The received EOC-frame is transmitted directly
downstream via a MON-0-message. Thus, a MON-0-message is issued on IOM every
6 ms. Acknowledgment and execution of the received command have to be initiated by
the microcontroller. The microcontroller can execute all defined test functions (close/
open loops, send corrupted CRCs) in the NT using MON-8-commands.
In the upstream direction the last incoming EOC-code from the IOM-2-Monitor channel
is transmitted to the LT.
Semiconductor Group
Executed EOC Commands in Auto Mode
LBBD
LB1
LB2
RCC
NCC
RTN
Direction
D
U
Function
Close complete loop-back (B1, B2, D). The U-transceiver
does not close the complete loop-back immediately after
receipt of this code. Instead it issues the C/I-command AIL
(in “Transparent” state) or ARL in the states “Error S/T” and
“Synchronized”. This allows the downstream device to
close the loop-back if desired (e.g. S-transceiver or
microcontroller).
Closes B1 loop-back in NT. All B1-channel data will be
looped back within the U-transceiver.
Closes B2 loop-back in NT. All B2-channel data will be
looped back within the U-transceiver.
Request corrupt CRC. Upon receipt the IEC-Q TE
transmits corrupted (= inverted) CRCs upstream. This
allows to test the near end block error counter on the LT-
side. The far end block error counter at the NT-side is
disabled and NT-error indications (MON-1) are suppressed.
Notify of corrupt CRC. Upon receipt of NCC the near end
block error counter is disabled and error indications are
suppressed. This prevents wrong error counts while
corrupted CRCs are sent.
Return to normal. With this command all previously sent
EOC-commands will be released. The EOC-processor is
reset to its initial state (FF
53
H
).
U-Transceiver
PSB 21911
PSF 21911
11.97