PEB 2091
PEF 2091
Operational Description
issued, the corresponding position in the SB channel will be set to "1", which is the
default value after the signal SL2 in the LT modes and SN3 in the NT modes are issued
on the U-interface (see state machines, pages 146, 160 and 173).
SB Transmission in NT Modes
Note 34: This section applies if one of the modes NT, NT-Auto Activation, TE and
NT-PBX is used (see "Basic Operating Mode", page 50).
The Single Bits will be set in the following manner:
• The Single bit ACT is controlled internally by the activation/deactivation state machine
(see "State Machine in NT Modes", page 160)
• Two different ways are available to control the Single bit SAI:
1- Internally by the activation/deactivation state machine (see "State Machine in NT
Modes", page 160), which is the default setting after power up.
2- By the MON-2 command.
Control via MON-2 can be set by issuing the MON-8 command PACE. To change this
setting back to IEC-Q internal control (1), the MON-8 command PACA can be issued.
(See "MON-8 Codes", page 228, for details about codes and programming of these
commands).
• The Single bit FEBE is controlled internally by the CRC processor (see "Monitoring
Transmission Quality", page 176). In addition the MON-8 message SFB can be issued
to set the FEBE bit to "0" once in the next available superframe (test mode, see
"MON-8 Codes", page 228, for details MON-8 codes and programming).
• The Single bit CSO is set to "0".
• The Single Bits PS1 and PS2 are programmed directly by the pins PS1 and PS2
respectively (see "Power Controller Pins", page 36 and page 45). any change in the
pin polarity will be indicated at the corresponding position and transmitted in the next
available superframe (see "Monitoring Primary and Secondary NT Power Supply",
page 194).
• The bit NTM is programmed via the M-bits of the MON-1 messages NTM and NORM
(see "MON-8 Codes", page 228).
• All of other Single Bits, i.e. M46, M48 M51, M52 and M61 can be set by the user via
MON-2 messages.
Table 21 gives an overview of SB control, and Table 22 gives a brief explanation of the
function of the SB in this mode.
Table 21
Single Bits Control in NT Modes (Upstream)
Position
NT –> LT
MON-2/U
Bit
ACT
1
Control
State Machine (IEC-Q)
MON-2
M41
M51
Semiconductor Group
116
Data Sheet 01.99
INFINEON [ Infineon ]
