PEF2091 Siemens Semiconductor Group, PEF2091 Datasheet - Page 72

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

Semiconductor Group
data (DU) on pin DIN. The IEC-Q is assigned to an individual channel by pin strapping
(see "Setting Operating Modes", page 50).
Note 10: This assigned channel is called the ’active channel’ of the IEC-Q. All other
The IOM
DIN, DOUT
DCL
FSC
I
Figure 25
3.6.1.2
Note 11: This timing applies to the NT, NT-Auto Activation, COT-512, LT-RP and
Note 12: Note also that the multiplexed mode timing described in 3.6.1.1 will reduce to
In this timing mode the IEC-Q provides a data clock DCL with a frequency of 512 kHz.
As a consequence the IOM
rate of 256 kbit/s.
FSC
DCL
DU
DD
®
-2 signals are:
channels, if available, are called the ’passive channels’ of the IEC-Q.
NT-RP modes.
this timing if the bit rate 256 kbit/s is chosen. In this mode there is therefore
only one active IOM
Plain Timing Mode
IOM
IOM
Multiplexed Frame Structure of the IOM
R
R
CH0
CH0
B1
256 to 2048 kbit/s
512 to 4096 kHz, input
8 kHz, input
CH1
CH1
®
-2 interface provides only one channel with a nominal data
CH2
CH2
®
B2
-2 channel. No passive IOM
CH3
CH3
125
MONITOR
72
s µ
CH4
CH4
CH5
CH5
D
®
-2 Interface
C/I
®
-2 channels are available.
CH6
CH6
Functional Description
M M
R X
CH7
CH7
Data Sheet 01.99
PEB 2091
PEF 2091
CH0
CH0
ITD04319