PEF2091 Siemens Semiconductor Group, PEF2091 Datasheet - Page 68

• Manufacturer Part Number: PEF2091
• Description: ICs for Communications(ISDN Echocancellation Circuit)
• Manufacturer: Siemens Semiconductor Group

Semiconductor Group
Table 10
Super
Frame #
1
2,3…
– ISW
– SW
– CRC
– EOC
– ACT
– DEA
– CSO
– UOA
– SAI
– FEBE
– PS1
– PS2
– NTM
– AIB
– NIB
Positions
Positions
Frame #
Inverted Synchronization Word (quat):
Synchronization Word (quat):
Cyclic Redundancy Check
Embedded Operation Channel
Activation bit
Deactivation bit
Cold Start Only
U-Only Activation
S-Activity Indicator
Far-end Block Error
Power Status Primary Source
Power Status Secondary Source
NT Test Mode
Alarm Indication Bit
Network Indication Bit
Basic
Quat
Bit
1
2
3
4
5
6
7
8
U-Frame Structure
Framing 2B + D Overhead Bits (M1 – M6)
1 – 18
Word
1 – 9
Sync
ISW
SW
SW
SW
SW
SW
SW
SW
2B + D
2B + D EOCa1 EOCa2 EOCa3
2B + D
2B + D EOCi3
2B + D EOCi6
2B + D EOCa1 EOCa2 EOCa3
2B + D
2B + D EOCi3
2B + D EOCi6
10 –
19 –
117
234
118s
EOC
EOC
235
d/m
d/m
M1
68
a
d/m
i
ACT = (1) –> Layer 2 ready for communication
DEA = (0) –> LT informs NT that it will turn off
CSO = (1) –> NT activation with cold start only
UOA = (0) –> U-only activated
SAI
NTM = (0) –> NT busy in test mode
AIB
NIB
FEBE = (0) –> Far-end block error occurred
PS1 = (1) –> Primary power supply ok
PS2 = (1) –> Secondary power supply ok
EOCi1
EOCi4
EOCi7
EOCi1
EOCi4
EOCi7
118m
236
M2
LT to NT dir. >
= address bit
= data / message bit
= information (data / message)
= (0) –> S-interface is deactivated
= (0) –> Interruption (according to ANSI)
= (1) –> no function
EOCi2
EOCi5
EOCi8
EOCi2
EOCi5
EOCi8 AIB / NIB CRC11 CRC12
119s
237
M3
– 3 – 3 + 3 + 3 + 3 – 3 + 3 – 3 – 3
+ 3 + 3 – 3 – 3 – 3 + 3 – 3 + 3 + 3
(reserved for network use)
1/ NTM
1/ CSO
Functional Description
1/ PS2
UOA /
DEA /
119m
ACT/
ACT
PS1
238
SAI
M4
1
/
< NT to LT dir.
Data Sheet 01.99
CRC1
CRC3
CRC5
CRC7
CRC9
120s
239
M5
1
1
PEB 2091
PEF 2091
CRC10
CRC2
CRC4
CRC6
CRC8
FEBE
120m
240
M6
1