PEF2091 Siemens Semiconductor Group, PEF2091 Datasheet - Page 199

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

Table 33
1) ’x’ is don’t care
Semiconductor Group
SWST:
BS
0
0
0
1
1
1
1
SWST:
SGL
0
1
0
0
1
1
1
S/G Bit Control Overview
ADF:
CBAC
x
0
1
0
1
0
1
1)
Description
S/G bit always "0"
S/G bit always "1"
S/G bit set to "1" continuously with
EOC 25
with EOC 27
BAC bit controls S/G-bit,
upstream D-channel not affected
S/G bit set to "1" for 4
IOM
received, automatically reset to
"0" after that. This is the default
setting of ADF:CBAC after reset
S/G bit set to "0" for 4
IOM
received, automatically reset to
"1" after that
S/G bit set to "1" continuously with
EOC 25
with EOC 27
BAC bit not read by IEC-Q V 5.3
S/G bit set to "1" continuously with
EOC 25
with EOC 27
BAC bit controls upstream
D-channel and S/G-bit
®
®
-2-frames with EOC 25
-2-frames with EOC 25
H
H
H
received, reset to "0"
received, reset to "0"
received, reset to "0"
H
H
H
199
received
received
received
H
H
Operational Description
Application
S/G and BAC are
(default)
handled by other
devices than the IEC-Q
ELIC
Interframe fill of
terminals contains
zeroes
(e.g. ’01111110’)
Synchronization of
base station, e.g. IBMC
or MBMC
Synchronization of
base station, e.g. IBMC
or MBMC. Inverse
polarity to the setting
1,0,0 (last row)
ELIC
Interframe fill of
terminals are ’ones’
®
®
on linecard,
on linecard,
Data Sheet 01.99
PEB 2091
PEF 2091