PEF2091 Siemens Semiconductor Group, PEF2091 Datasheet - Page 60

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

PEB 2091
PEF 2091
Functional Description
3.4
Transceiver Core
The U transceiver establishes the direct link between the exchange and the terminal side
over two copper wires. Transmission over the U-interface is performed at a rate of
80 kBaud. Two binary informations are coded into one quaternary symbol (2B1Q)
resulting in a total of 160 kbit/s to be transmitted. 144 kbit/s are user data (2B + D), 16
kbit/s are used for maintenance and synchronization information. For the structure of the
U-interface, see "U-Interface", page 67. User access to the transceiver core will be
®
established via one of the IEC-Q interfaces, e.g. IOM
-2 or µP interface (see Figure16
and 17 above). The access method to the transceiver core and to other blocks of the
IEC-Q will be the scope of chapter 4, "Operational Description", page 96 ff.
Semiconductor Group
60
Data Sheet 01.99