PEF2091 Siemens Semiconductor Group, PEF2091 Datasheet - Page 177

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

Figure 77
NEBE Indications
In NT and LT-RP modes each NEBE will be indicated in the following way
– The MON-1 message NEBE is issued via IOM
– The MON-1 message FNBE is issued via IOM
For informations about MON-1 structure and codes, see "MON-1 Codes", page 227.
Note 49: In LT and COT modes a NEBE will not be actively indicated by the IEC-Q. To
FEBE Indications
In NT and LT-RP modes each FEBE will be indicated in the following way
– The MON-1 message FEBE is issued via IOM
– The MON-1 message FNBE is issued via IOM
For informations about MON-1 structure and codes, see "MON-1 Codes", page 227.
Semiconductor Group
LT --> NT Superframe
Frame Number
Current CRC Bits Related to
Frame Number
Current FEBE Bit Related to
Frame Number
NT --> LT Superframe
Frame Number
Current CRC Bits Related to
Frame Number
Current FEBE Bit Related to
Frame Number
occurred
FEBE occurred simultaneously
have occurred
FEBE have occurred simultaneously
monitor NEBE violations the NEBE counter should be read out, see "Block
Error Counters", page 178.
Relationship between CRC and FEBE Bits and Superframe Number
...Z
...0
177
A
Z
1
0
®
®
®
®
-2 and µP interface if only a NEBE
-2 and µP interface if only a FEBE
-2 and µP interface if NEBE and a
-2 and µP interface if NEBE and a
B
A
0
2
1
Z
Operational Description
C
B
1
3
2
A
Data Sheet 01.99
PEB 2091
PEF 2091
D
C
2
4
3
B