PEB 2091
PEF 2091
Operational Description
4.2.3
Access to the Single Bits of U-Interface
The transmission procedure of the Single Bits (SB) on the U-interface is mode
dependent. The reception procedure of the SB from the U-interface is independent1) of
the mode used. Transmission and reception of SB will therefore be discussed in to
different sections below. For definition of Single Bits, see "Single Bits Channel", page 69.
For more information on Monitor Channel handling, see "IOM®-2 Monitor Channel",
page 76, and for the microprocessor mode "Monitor Channel Access", page 101.
Correspondence between MON-2 Messages and SB
The content of the MON-2 message (Table 20) corresponds to the Single Bits in the
U-frame (see "U-Frame Structure", page 68). Bit M46 in the MON-2 message, for
example, will be inserted at position M46 in the U-frame.
Table 20
Content of MON-2 Message
1. Byte
2. Byte
M52 M62 M43 M44 M45 M46 M47 M48
Overhead Bits
0 0 1 0
MON-2
M41 M51 M61 M42
Overhead Bits
4.2.3.1 Single Bits Transmission on U
Figure 51 sketches roughly how transmitted Single Bits can be accessed.
U Basic Frame
1.5 ms
Transmitter
(I)SW
Fixed
18 Bits
Data
12x (2B+D)
216 Bits
M1-M3
3 Bits
M4
1 Bit
M5-M6
2 Bits
Data
(To U)
Time
MON-11), MON-2, MON-8
From IOM®-2 or µP
SB
Processor
Pins PS1 and PS21)
1) Applies only in NT modes
Figure 51
Access to Single Bits Transmission on U
The Single Bits defined by a MON-2 message are latched. I.e. they need to be issued
only once. Repetition will be performed by the SB processor. If no MON-2 messages are
1) Exception: The default setting of the repeater modes for SB indication is different than the default setting in
other modes, see "Single Bits Reception from U", page 120
Semiconductor Group
115
Data Sheet 01.99
INFINEON [ Infineon ]
