PEF2091 Siemens Semiconductor Group, PEF2091 Datasheet - Page 119

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

Table 24
Bit
ACT
DEA
UOA
FEBE
Table 23
Semiconductor Group
MON-2/U
Position
M41
M51
M61
M42
M52
M62
M43
M44
M45
M46
M47
M48
Function
The ACT-bit is part of the start-up sequence and is used to indicate layer 2
to be ready for communication. In this case it is set to (1)
(Deactivation bit)
By setting DEA to (0), the network informs the NT of its intention to turn-off
(Partial Activation)
The UOA-bit is used by the network side to inform the NT that only the
U-interface shall be activated (S-interface remains deactivated. If the
UOA-bit is set to (0), only the U-interface will be activated
(Far-End Block Error)
The FEBE-bit is used to inform the opposite U-interface station that the
transmitted data could not be received free of errors. The device sets the
FEBE-bit to (0) if errors were observed. Each time a FEBE = (0) is detected,
the internal far-end block error counter will be incremented. Additionally it
is possible to control the FEBE-bit with the MON-8-message "SFB"
(Activation bit)
Single Bits Control in LT Modes (Downstream)
Function of the Predefined SB in LT Modes
FEBE
UOA
DEA
ACT
Bit
1
1
1
1
1
1
1
1
CRC processor (IEC-Q) and MON8
State Machine (IEC-Q) / MON-2
LT –> NT
State Machine (IEC-Q)
State Machine (IEC-Q)
119
"0" (IEC-Q)
Pin PS2
Control
MON-2
MON-2
MON-2
MON-1
MON-2
MON-2
Operational Description
Data Sheet 01.99
PEB 2091
PEF 2091