PEB 2091
PEF 2091
Operational Description
SB Transmission in Repeater Modes
Note 36: This section applies to NT-RP and NT-RP modes (see "Basic Operating
Mode", page 50).
In these modes all of the Single Bits need to be controlled via MON-2-messages. This
permits to implement national repeater specifications for overhead bit treatment. For a
short explanation of the function of the SB in both NT and LT modes refer to Tables 22
and 24 above.
4.2.3.2 Single Bits Reception from U
The received Single Bits from the U-interface are forwarded via MON-2 messages to the
controller unit1) to allow higher layer evaluation of these data.
U Basic Frame
1.5 ms
Receiver
Data
(From U)
Data
12x (2B+D)
216 Bits
(I)SW
Fixed
18 Bits
M5-M6
2 Bit
M4
1 Bit
M1-M3
3 Bits
Time
MON-1, -2
To IOM®-2 and
SB
Processor
µP (if used)
Figure 52
Access to Single Bits Received from U
The IEC-Q Version 5.3 allows almost free control of the conditions for Single Bits
verification. Single Bits can be filtered and forwarded in one of the following ways:
• A MON-2 is issued if the polarity of at least one of the Single Bits, other than FEBE,
has been changed. (Compatible to Version 5.1).
• A MON-2 message will be issued only if in addition no CRC violations have been
detected in the completed last two superframes. (Compatible to all previous IEC-Q
versions other than Version 5.1).
• Furthermore, verification of Single Bits changes can be chosen to be controlled by a
triple last look processor. Choosing this filtering method will imply that a change in a
Single Bit will be issued via MON-2 message only if an identical bit value has been
received for three consecutive superframes.
1) Upstream in the LT modes and downstream in the NT modes
Semiconductor Group
120
Data Sheet 01.99
INFINEON [ Infineon ]
