PEF2091 Siemens Semiconductor Group, PEF2091 Datasheet - Page 248

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

Semiconductor Group
7
One of the most important conditions for maximizing device, board and system
performance is the way the IEC-Q is connected to external circuitry on the board. Section
7.1 gives some recommendations concerning external circuitry and layout. It also
defines the characteristics of the crystal if it is needed for the mode being used.
Section 7.2 gives an example for using the S/G and BAC bit feature of the IEC-Q to
design PBX systems with D-channel arbitration.
Some application hits for repeater systems are given in section 7.3.
The IEC-Q provides special modes to allow performance of system measurements
defined by ITU, ANSI and ETSI. Section 7.4 shows which system set-ups are needed for
performing these measurement.
Note 69: This chapter covers only a small part of the applications which can be served
by the IEC-Q. For more information, refer to the various application notes
published on this subject.
Application Hints
248
Application Hints
Data Sheet 01.99
PEB 2091
PEF 2091