參數(shù)資料
型號(hào): PSB21911
廠商: SIEMENS A G
元件分類(lèi): 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(yè)數(shù): 47/164頁(yè)
文件大?。?/td> 1401K
代理商: PSB21911
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PSB 21911
PSF 21911
U-Transceiver
Semiconductor Group
47
11.97
Testing Block Error Counters
Figure 18
illustrates how the IEC-Q TE supports testing of the LT’s block error counters.
Transmission errors are simulated with artificially corrupted CRCs. With two commands
the cyclic redundancy checksum can be inverted in the downstream and in the upstream
direction. A third command offers to invert single FEBE-bits.
With EOC command
NCC
the LT notifies the NT of corrupted CRCs. Again, there are
differences in the functional behavior of the NEBE-counter depending on the EOC mode:
Auto-mode
NEBE-detection stopped, no MON-1 NEBE-messages
and NEBE-counter disabled
NEBE-detection enabled, MON-1-message NEBE issued
and NEBE-counter enabled
Transparent mode
With EOC command
RCC
the LT requests the NT-side to send corrupted CRCs. In EOC
auto mode the IEC-Q TE will react automatically with a permanently inverted upstream
CRC. In EOC transparent mode this reaction has to be prompted by a MON-8 CCRC
command. Note that MON-8 CCRC is not excecuted if it was not preceeded by the EOC
command RCC.
There are also differences in the functional behavior of the FEBE-counter depending on
the EOC mode:
EOC
Auto mode
FEBE-detection stopped, no MON-1 FEBE-messages
and FEBE-counter disabled
Transparent mode
FEBE-detection enabled, MON-1-message FEBE issued
and FEBE-counter en
abled
The EOC command
RTN
disables all previously sent EOC commands. In EOC
transparent mode EOC command RTN must be followed by a MON-8 NORM command
to become effective.
With the MON-8-command
SFB
it is possible to invert single FEBE-bits. Because this
command does not provoke permanent FEBE-bit inversion but sets only one FEBE-bit
to (0) per SFB command, it is possible to predict the exact FEBE-counter reading.
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