PEF2091 Siemens Semiconductor Group, PEF2091 Datasheet - Page 123

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

In the LT Mode ( page 147): "Line Active", "Pend. Transparent", "S/T Deactivated",
Verification Control for Additional Overhead Bits
Table 27 gives the available settings for Additional Overhead Bits (M51, M52, M61)
filtering via MON-8 command.
Table 27
1) see Table 25 for definition
Reset behavior
MON-2 messages will be issued only if the Receiver is synchronized. This is done to
avoid meaningless MON-2 messages if data transmission is not synchronized.
In other words, MON-2 messages will be issued only in the following states:
"Pend. Deactivation" and "Transparent".
In the NT Mode (page 161): "Synchronized 1", "Synchronized 2", "Wait for Act",
"Transparent", "ERROR S/T", "Pend. Deact. S/T", "Pend. Deact. U" and "Analog Loop
Back".
In the LT-Repeater Mode ( page 174): "Pend. Transparent", "Transparent", "Pend.
Deactivation".
In the NT-Repeater Mode ( page 175): "Synchronized", "Transparent", "ERROR",
"Pend. Deact." and "Analog Loop Back".
Mode setting via MON-8 will be reset only if the "Test" state is entered (see "State
Machine in LT Modes", page 146), i.e. after UVD, Hardware Reset, Software Reset or
Power-On Reset.
Semiconductor Group
1000 1010
1000 1001
1000 1011
1000 1000
D7-D0 (Bin)
Code
1)
Setting Filtering Method for Additional Overhead Bits
TLL
(Default,
not RP)
CRC
(Default,
RP)
TLL,
CRC
On
Change
Symbol
A change in at least one of the Additional Overhead Bits will
be passed via MON-2 only after valid triple last look. This is
the default setting after reset in all non repeater modes
A change in at least one of the Additional Overhead Bits will
be passed via MON-2 only if the CRC is valid for the last two
superframes, not including the current one.
This is the default setting after reset in the repeater modes
A change in at least one of the Additional Overhead Bits will
be passed via MON-2 only after valid triple last look, and if
the CRC is valid for the last two superframes, not including
the current one
Every change in at least one of the Additional Overhead Bits
will be passed via MON-2
123
Function
Operational Description
Data Sheet 01.99
PEB 2091
PEF 2091