PEF2091 Siemens Semiconductor Group, PEF2091 Datasheet - Page 83

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

PEB 2091
PEF 2091
Functional Description
• the bit CIWU:SPU is set to ’0’ or
• a wake-up tone is detected on the U-interface
DCL is activated such that its first rising edge occurs with the beginning of the bit
following the C/I0 channel. After the clocks have been enabled this is indicated by the
PU code in the C/I0 channel.
For detailed operational description, see "State Machine in NT Modes", page 160 ff.
3.7
Clocks
Clock generation of the IEC-Q depends on the mode used. The following sections will
describe the properties of these clocks in each mode. For better understanding of the
®
clock scheme in the different applications the properties of the IOM
-2 clocks will also
be outlined.
Semiconductor Group
83
Data Sheet 01.99