參數(shù)資料
型號: 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): 43/164頁
文件大?。?/td> 1401K
代理商: PSB21911
PSB 21911
PSF 21911
U-Transceiver
Semiconductor Group
43
11.97
Table 6
U-Frame Structure
– ISW
– SW
– CRC
– EOC
Inverted Synchronization Word (quad):
Synchronization Word (quad):
Cyclic Redundancy Check
Embedded Operation Channel
– 3 – 3 + 3 + 3 + 3 – 3 + 3 – 3 – 3
+ 3 + 3 – 3 – 3 – 3 + 3 – 3 + 3 + 3
a
d/m
i
ACT
DEA
CSO
UOA
SAI
FEBE = (0) –> Far-end block error occurred
PS1
= (1) –> Primary power supply ok
PS2
= (1) –> Secondary power supply ok
NTM
= (0) –> NT busy in test mode
AIB
= (0) –> Interruption (according to ANSI)
NIB
= (1) –> no function
(reserved for network use)
= address bit
= data / message bit
= information (data / message)
= (1) –> Layer 2 ready for communication
= (0) –> LT informs NT that it will turn off
= (1) –> NT-activation with cold start only
= (0) –> U-only activated
= (0) –> S-interface is deactivated
– ACT
– DEA
– CSO
– UOA
– SAI
– FEBE Far-end Block Error
– PS1
Power Status Primary Source
– PS2
Power Status Secondary Source
– NTM
NT-Test Mode
– AIB
Alarm Indication Bit
– NIB
Network Indication Bit
Activation bit
Deactivation bit
Cold Start Only
U-Only Activation
S-Activity Indicator
Framing 2B + D
Overhead Bits (M1 – M6)
Quat
Positions
1 – 9
10 –
117
118
118
119
119
120
120
Bit
Positions
1 – 18
19 –
234
235
236
237
238
239
240
Super
Frame #
Basic
Frame #
Sync
Word
2B + D
M1
M2
M3
M4
M5
M6
1
1
ISW
2B + D EOCa1 EOCa2 EOCa3
ACT/
ACT
1
1
2
SW
2B + D
EOC
d/m
EOCi1
EOCi2
DEA /
PS1
1
FEBE
3
SW
2B + D
EOCi3
EOCi4
EOCi5
1/ PS2
CRC1
CRC2
4
SW
2B + D
EOCi6
EOCi7
EOCi8
1/ NTM
CRC3
CRC4
5
SW
2B + D EOCa1 EOCa2 EOCa3
1/ CSO
CRC5
CRC6
6
SW
2B + D
EOC
d/m
EOCi1
EOCi2
1
CRC7
CRC8
7
SW
2B + D
EOCi3
EOCi4
EOCi5
UOA /
SAI
CRC9
CRC10
8
SW
2B + D
EOCi6
EOCi7
EOCi8
AIB / NIB CRC11 CRC12
2,3…
LT- to NT dir. >
/
< NT- to LT dir.
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